Sample Business Contracts


Indenture - Birch Telecom Inc.


                                                                  EXECUTION COPY


                               BIRCH TELECOM, INC.

                                    As Issuer



                                  $115,000,000

                            14% SENIOR NOTES DUE 2008



                                    INDENTURE

                            Dated as of June 23, 1998


                  NORWEST BANK MINNESOTA, NATIONAL ASSOCIATION,

                                   As Trustee
<PAGE>   2
                                                               EXECUTION COPY
                             CROSS-REFERENCE TABLE*

Trust Indenture
Act Section                                             Indenture Section

310  (a)(1)                                                          7.10
     (a)(2)                                                          7.10
     (a)(3)                                                          N.A.
     (a)(4)                                                          N.A.
     (a)(5)                                                          7.10
     (b)                                                             7.10
     (c)                                                             N.A.
311  (a)                                                             7.11
     (b)                                                             7.11
     (c)                                                             N.A.
312  (a)                                                             2.05
     (b)                                                            11.03
     (c)                                                            11.03
313  (a)                                                             7.06
     (b)(1)                                                          N.A.
     (b)(2)                                                          7.07
     (c)                                                      7.06; 11.02
     (d)                                                             7.06
314  (a)                                                      4.03; 11.02
     (b)                                                            11.04
     (c)(1)                                                         11.04
     (c)(2)                                                         11.04
     (c)(3)                                                          N.A.
     (d)                                                            10.01
     (e)                                                            11.05
     (f)                                                               NA
315  (a)                                                             7.01
     (b)                                                      7.05, 11.02
     (c)                                                             7.01
     (d)                                                             7.01
     (e)                                                             6.11
316  (a)(last sentence)                                              2.09
     (a)(1)(A)                                                       6.05
     (a)(1)(B)                                                       6.04
     (a)(2)                                                          N.A.
     (b)                                                             6.07
     (c)                                                             2.12
317  (a)(1)                                                          6.08
     (a)(2)                                                          6.09
     (b)                                                             2.04
318  (a)                                                            11.01
     (b)                                                             N.A.
     (c)                                                            11.01
<PAGE>   3
N.A. means not applicable.

*This Cross-Reference Table is not part of the Indenture.
<PAGE>   4
                                                                  EXECUTION COPY

                                TABLE OF CONTENTS



                                                                                                      PAGE
                                                                                                   
ARTICLE 1. DEFINITIONS AND INCORPORATION BY REFERENCE                                                    1
   Section 1.01.   Definitions                                                                           1
   Section 1.02.   Other Definitions                                                                    16
   Section 1.03.   Incorporation by Reference of TIA                                                    17
   Section 1.04.   Rules of Construction                                                                17
                                                                                                       
                                                                                                       
ARTICLE 2. THE NOTES                                                                                    17
   Section 2.01.   Form and Dating                                                                      17
   Section 2.02.   Execution and Authentication                                                         19
   Section 2.03.   Registrar and Paying Agent                                                           19
   Section 2.04.   Paying Agent to Hold Money in Trust                                                  19
   Section 2.05.   Holder Lists                                                                         20
   Section 2.06.   Transfer and Exchange                                                                20
   Section 2.07.   Replacement Notes                                                                    32
   Section 2.08.   Outstanding Notes                                                                    33
   Section 2.09.   Treasury Notes                                                                       33
   Section 2.10.   Temporary Notes                                                                      33
   Section 2.11.   Cancellation                                                                         33
   Section 2.12.   Defaulted Interest                                                                   34
                                                                                                       
                                                                                                       
ARTICLE 3. REDEMPTION AND PREPAYMENT                                                                    34
   Section 3.01.   Notices to Trustee                                                                   34
   Section 3.02.   Selection of Notes to Be Redeemed                                                    34
   Section 3.03.   Notice of Redemption                                                                 34
   Section 3.04.   Effect of Notice of Redemption                                                       35
   Section 3.05.   Deposit of Redemption Price                                                          35
   Section 3.06.   Notes Redeemed in Part                                                               36
   Section 3.07.   Optional Redemption                                                                  36
   Section 3.08.   Mandatory Redemption                                                                 36
   Section 3.09.   Offer to Purchase by Application of Excess Proceeds                                  37
                                                                                                       
                                                                                                       
ARTICLE 4. COVENANTS                                                                                    38
   Section 4.01.   Payment of Notes                                                                     38
   Section 4.02.   Maintenance of Office or Agency                                                      39
   Section 4.03.   Reports                                                                              39
   Section 4.04.   Compliance Certificate                                                               40
   Section 4.05.   Taxes                                                                                40
   Section 4.06.   Stay, Extension and Usury Laws                                                       40
   Section 4.07.   Restricted Payments                                                                  41
   Section 4.08.   Dividend and Other Payment Restrictions Affecting Subsidiaries                       42
   Section 4.09.   Incurrence of Indebtedness and Issuance of Disqualified Stock                        43
   Section 4.10.   Asset Sales                                                                          45

<PAGE>   5

                                                                                                   
   Section 4.11.   Transactions with Affiliates                                                         46
   Section 4.12.   Liens                                                                                47
   Section 4.13.   Business Activities                                                                  47
   Section 4.14.   Corporate Existence                                                                  47
   Section 4.15.   Offer to Repurchase Upon Change of Control                                           47
   Section 4.16.   Limitation on Sale and Leaseback Transactions                                        48
   Section 4.17.   Limitation on Issuances and Sales of Equity Interests of Restricted Subsidiaries     49
   Section 4.18.   Limitation on Issuances of Guarantees of Indebtedness                                49


ARTICLE 5. SUCCESSORS                                                                                   49
   Section 5.01.   Merger, Consolidation or Sale of Assets                                              49
   Section 5.02.   Successor Corporation Substituted                                                    50


ARTICLE 6. DEFAULTS AND REMEDIES                                                                        50
   Section 6.01.   Events of Default                                                                    50
   Section 6.02.   Acceleration                                                                         52
   Section 6.03.   Other Remedies                                                                       52
   Section 6.04.   Waiver of Past Defaults                                                              52
   Section 6.05.   Control by Majority                                                                  53
   Section 6.06.   Limitation on Suits                                                                  53
   Section 6.07.   Rights of Holders of Notes to Receive Payment                                        53
   Section 6.08.   Collection Suit by Trustee                                                           53
   Section 6.09.   Trustee May File Proofs of Claim                                                     54
   Section 6.10.   Priorities                                                                           54
   Section 6.11.   Undertaking for Costs                                                                54


ARTICLE 7. TRUSTEE                                                                                      55
   Section 7.01.   Duties of Trustee                                                                    55
   Section 7.02.   Rights of Trustee                                                                    56
   Section 7.03.   Individual Rights of Trustee                                                         56
   Section 7.04.   Trustee's Disclaimer                                                                 56
   Section 7.05.   Notice of Defaults                                                                   56
   Section 7.06.   Reports by Trustee to Holders of the Notes                                           57
   Section 7.07.   Compensation and Indemnity                                                           57
   Section 7.08.   Replacement of Trustee                                                               58
   Section 7.09.   Successor Trustee by Merger, etc                                                     59
   Section 7.10.   Eligibility; Disqualification                                                        59
   Section 7.11.   Preferential Collection of Claims Against Company                                    59


ARTICLE 8. LEGAL DEFEASANCE AND COVENANT DEFEASANCE                                                     59
   Section 8.01.   Option to Effect Legal Defeasance or Covenant Defeasance                             59
   Section 8.02.   Legal Defeasance and Discharge                                                       59
   Section 8.03.   Covenant Defeasance                                                                  60
   Section 8.04.   Conditions to Legal or Covenant Defeasance                                           60
   Section 8.05.   Deposited Money and U.S. Government Obligations to be Held in Trust; Other 
                   Miscellaneous Provisions                                                             61
   Section 8.06.   Repayment to Company                                                                 62

<PAGE>   6

                                                                                                   
   Section 8.07.   Reinstatement                                                                        62


ARTICLE 9. AMENDMENT, SUPPLEMENT AND WAIVER                                                             62
   Section 9.01.   Without Consent of Holders of Notes                                                  62
   Section 9.02.   With Consent of Holders of Notes                                                     63
   Section 9.03.   Compliance with Trust Indenture Act                                                  65
   Section 9.04.   Revocation and Effect of Consents                                                    65
   Section 9.05.   Notation on or Exchange of Notes                                                     65
   Section 9.06.   Trustee to Sign Amendments, etc                                                      65


ARTICLE 10. SECURITY                                                                                    65
   SECTION 10.01.  SECURITY                                                                             65


ARTICLE 11. MISCELLANEOUS                                                                               66
   Section 11.01.  Trust Indenture Act Controls                                                         66
   Section 11.02.  Notices                                                                              67
   Section 11.03.  Communication by Holders of Notes with Other Holders of Notes                        68
   Section 11.04.  Certificate and Opinion as to Conditions Precedent                                   68
   Section 11.05.  Statements Required in Certificate or Opinion                                        68
   Section 11.06.  Rules by Trustee and Agents                                                          68
   Section 11.07.  No Personal Liability of Directors, Officers, Employees and Stockholders             69
   Section 11.08.  Governing Law                                                                        69
   Section 11.09.  No Adverse Interpretation of Other Agreements                                        69
   Section 11.10.  Successors                                                                           69
   Section 11.11.  Severability                                                                         69
   Section 11.12.  Counterpart Originals                                                                69
   Section 11.13.  Table of Contents, Headings, etc                                                     69


EXHIBITS
Exhibit A-1        FORM OF NOTE
Exhibit A-2        FORM OF REGULATION S GLOBAL NOTE
Exhibit B          FORM OF CERTIFICATE OF TRANSFER
Exhibit C          FORM OF CERTIFICATE OF EXCHANGE
Exhibit D          FORM OF INSTITUTIONAL ACCREDITED INVESTOR REPRESENTATION
                   LETTER
Exhibit E          FORM OF NOTATION OF GUARANTEE
Exhibit F          FORM OF SUPPLEMENTAL INDENTURE TO BE DELIVERED
                   BY SUBSEQUENT GUARANTORS
<PAGE>   7
                                                                  EXECUTION COPY

                  INDENTURE dated as of June 23, 1998 between Birch Telecom,
Inc., a Delaware corporation (the "Company"), and Norwest Bank Minnesota,
National Association, as trustee (the "Trustee").

                  The Company and the Trustee agree as follows for the benefit
of each other and for the equal and ratable benefit of the Holders of the 14%
Senior Notes due 2008 (the "Notes"):

                                   ARTICLE 1.
                   DEFINITIONS AND INCORPORATION BY REFERENCE

SECTION 1.01.     DEFINITIONS.

                  "144A Global Note" means a global note in the form of Exhibit
A-1 hereto bearing the Global Note Legend and the Private Placement Legend and
deposited with or on behalf of, and registered in the name of, the Depositary or
its nominee that will be issued in a denomination equal to the outstanding
principal amount of the Notes sold in reliance on Rule 144A.

                  "Acquired Debt" means, with respect to any specified Person,
(i) Indebtedness of any other Person existing at the time such other Person is
merged with or into or became a Subsidiary of such specified Person, other than
Indebtedness incurred in connection with, or in contemplation of, such other
Person merging with or into or becoming a Subsidiary of such specified Person,
and (ii) Indebtedness secured by a Lien encumbering any asset acquired by such
specified Person.

                  "Affiliate" of any specified Person means any other Person
directly or indirectly controlling or controlled by or under direct or indirect
common control with such specified Person. For purposes of this definition,
"control" (including, with correlative meanings, the terms "controlling,"
"controlled by" and "under common control with"), as used with respect to any
Person, shall mean the possession, directly or indirectly, of the power to
direct or cause the direction of the management or policies of such Person,
whether through the ownership of voting securities, by agreement or otherwise;
provided that beneficial ownership of 10% or more of the Voting Stock of a
Person shall be deemed to be control.

                  "Agent" means any Registrar, Paying Agent or co-registrar.

                  "Applicable Procedures" means, with respect to any transfer or
exchange of or for beneficial interests in any Global Note, the rules and
procedures of the Depositary, Euroclear and Cedel that apply to such transfer or
exchange.

                  "Asset Sale" means (i) the sale, lease, conveyance or other
disposition of any assets or rights (including, without limitation, by way of a
sale and leaseback) provided that the sale, lease, conveyance or other
disposition of all or substantially all of the assets of the Company and its
Subsidiaries taken as a whole will be governed by the provisions of Section 4.15
and/or the provisions described in Section 5.01 hereof and not by the provisions
of the Asset Sale covenant in Section 4.10 hereof, and (ii) the issue or sale by
the Company or any of its Restricted Subsidiaries of Equity Interests of any of
the Company's Subsidiaries (other than directors' qualifying shares or shares
required by applicable law to be held by a Person other than the Company or a
Restricted Subsidiary), in the case of either clause (i) or (ii), whether in a
single transaction or a series of related transactions (a) that have a Fair
Market Value in excess of $1,000,000 or (b) for net proceeds in excess of
$1,000,000. 


                                       7
<PAGE>   8
Notwithstanding the foregoing, the following items shall not be deemed to be
Asset Sales: (i) a transfer of assets by the Company to a Restricted Subsidiary
or by a Restricted Subsidiary to the Company or to another Restricted
Subsidiary, (ii) an issuance of Equity Interests by a Subsidiary to the Company
or to another Restricted Subsidiary, (iii) a Restricted Payment or Permitted
Investment that is permitted by Section 4.07 hereof, (iv) the sale or other
disposition of real or personal property or equipment that has become worn out,
obsolete or damaged or otherwise unsuitable or not required for use in
connection with the business of the Company or any Restricted Subsidiary, as the
case may be, (v) disposals of Cash Equivalents and (vi) sales or other
dispositions of assets for consideration, received substantially concurrently
with such sale or disposition, at least equal to the Fair Market Value of the
assets sold or disposed of, to the extent that the consideration received would
constitute property or assets of the kind described in clauses (c), (d), or (e)
of the second paragraph of Section 4.10 hereof, provided that such consideration
may also include a cash equalization payment, in which case such cash payment,
if received by the Company or any of its Restricted Subsidiaries, will be deemed
to be proceeds received from an Asset Sale which will be applied in accordance
with the provisions of Section 4.10 hereof.

                  "Attributable Debt" in respect of a sale and leaseback
transaction means, at the time of determination, the present value (discounted
at the rate of interest implicit in such transaction, determined in accordance
with GAAP) of the obligation of the lessee for net rental payments during the
remaining term of the lease included in such sale and leaseback transaction
(including any period for which such lease has been extended or may, at the
option of the lessor, be extended).

                  "Bankruptcy Law" means Title 11, U.S. Code or any similar
federal or state law for the relief of debtors.

                  "Board of Directors" means the Board of Directors of the
Company, or any authorized committee of the Board of Directors.

                  "Broker-Dealer" means any broker or dealer registered under
the Exchange Act.

                  "Business Day" means any day other than a Legal Holiday.

                  "Capital Lease Obligation" means, at the time any
determination thereof is to be made, the amount of the liability in respect of a
capital lease that would at such time be required to be capitalized on a balance
sheet in accordance with GAAP.

                  "Capital Stock" means (i) in the case of a corporation,
corporate stock, (ii) in the case of an association or business entity, any and
all shares, interests, participations, rights or other equivalents (however
designated) of corporate stock, (iii) in the case of a partnership or limited
liability company, partnership or membership interests (whether general or
limited) and (iv) any other interest or participation that confers on a Person
the right to receive a share of the profits and losses of, or distributions of
assets of, the issuing Person.

                  "Cash Equivalents" means (i) United States dollars, (ii)
securities issued or directly and fully guaranteed or insured by the United
States government or any agency or instrumentality thereof (provided that the
full faith and credit of the United States is pledged in support thereof) having
maturities of not more than one year from the date of acquisition, (iii)
certificates of deposit and eurodollar time deposits with maturities of one year
or less from the date of acquisition, bankers' acceptances with maturities not
exceeding one year and overnight bank deposits, in each case with any 


                                       8
<PAGE>   9
domestic commercial bank having capital and surplus in excess of $500,000,000
and a Thompson Bank Watch Rating of "B" or better, (iv) repurchase obligations
with a term of not more than 30 days for underlying securities of the types
described in clauses (ii) and (iii) above entered into with any financial
institution meeting the qualifications specified in clause (iii) above, (v)
commercial paper or other indebtedness issued by domestic corporations having
the highest rating obtainable from either Moody's Investors Service, Inc. or
Standard & Poor's Ratings Group and, in each case maturing within one year after
the date of acquisition and (vi) money market funds at least 95% of the assets
of which constitute Cash Equivalents of the kinds described in clauses (i)
through (v) of this definition.

                  "Cedel" means Cedel Bank, societe anonyme.

                  "Change of Control" means the occurrence of any of the
following: (i) the sale, lease, transfer, conveyance or other disposition (other
than by way of merger or consolidation), in one or a series of related
transactions, of all or substantially all of the assets of the Company and its
Restricted Subsidiaries, taken as a whole to any "person" (as such term is used
in Section 13(d)(3) of the Exchange Act), other than any of the Principals and
their Related Parties; (ii) the adoption of a plan relating to the liquidation
or dissolution of the Company; (iii) the consummation of any transaction
(including, without limitation, any merger or consolidation) the result of which
is that any "person" (as defined above), other than the Principals, their
Related Parties or (prior to the establishment of a Public Market) a Permitted
Group, becomes the "beneficial owner" (as such term is defined in Rule 13d-3 and
Rule 13d-5 under the Exchange Act, except that a person shall be deemed to have
"beneficial ownership" of all securities that such person has the right to
acquire, whether such right is currently exercisable or is exercisable only upon
the occurrence of a subsequent condition), directly or indirectly, of (A) more
than 40% of the Voting Stock of the Company and (B) more of the Voting Stock of
the Company than is at the time "beneficially owned" (as defined above) by the
Principals and their Related Parties in the aggregate (Voting Stock, in each
case, measured by voting power rather than number of shares); (iv) the first day
on which a majority of the members of the Board of Directors are not Continuing
Directors; or (v) the Company consolidates with, or merges with or into, any
Person, or any Person consolidates with, or merges with or into, the Company, in
any such event pursuant to a transaction in which any of the outstanding Voting
Stock of the Company is converted into or exchanged for cash, securities or
other property, other than any such transaction where the Voting Stock of the
Company outstanding immediately prior to such transaction is converted into or
exchanged for Voting Stock (other than Disqualified Stock) of the surviving or
transferee Person constituting a majority of the outstanding shares of such
Voting Stock of such surviving or transferee Person (immediately after giving
effect to such issuance).

                  "Common Stock" of any Person means Capital Stock of such
Person that does not rank prior, as to the payment of dividends or as to the
distribution of assets upon any voluntary or involuntary liquidation,
dissolution or winding up of such Person, to shares of Capital Stock of any
other class of such Person.

                  "Company" means Birch Telecom, Inc., and any and all
successors thereto.

                  "Consolidated Assets" means, with respect to the Company, the
total consolidated assets of the Company and its Restricted Subsidiaries, as
shown on the most recent internal consolidated balance sheet of the Company and
such Restricted Subsidiaries calculated on a consolidated basis in accordance
with GAAP.

                  "Consolidated Cash Flow" means, with respect to any Person for
any period, the


                                       9
<PAGE>   10
Consolidated Net Income of such Person for such period plus (i) provision for
taxes based on income or profits of such Person and its Restricted Subsidiaries
for such period, to the extent that such provision for taxes was included in
computing such Consolidated Net Income, plus (ii) consolidated interest expense
of such Person and its Restricted Subsidiaries for such period, whether paid or
accrued and whether or not capitalized (including, without limitation,
amortization of debt issuance costs and original issue discount, non-cash
interest payments, the interest component of any deferred payment obligations,
the interest component of all payments associated with Capital Lease
Obligations, imputed interest with respect to Attributable Debt, commissions,
discounts and other fees and charges incurred in respect of letter of credit or
bankers' acceptance financings, and net payments (if any) pursuant to Hedging
Obligations), to the extent that any such expense was deducted in computing such
Consolidated Net Income, plus (iii) depreciation, amortization (including
amortization of goodwill and other intangibles but excluding amortization of
prepaid cash expenses that were paid in a prior period) and other non-cash
expenses (excluding any such non-cash expense to the extent that it represents
an accrual of or reserve for cash expenses in any future period or amortization
of a prepaid cash expense that was paid in a prior period) of such Person and
its Restricted Subsidiaries for such period to the extent that such
depreciation, amortization and other non-cash expenses were deducted in
computing such Consolidated Net Income, minus (iv) non-cash items increasing
such Consolidated Net Income for such period (excluding any items that were
accrued in the ordinary course of business), in each case on a consolidated
basis and determined in accordance with GAAP.

                  "Consolidated Indebtedness" means, with respect to any Person
as of any date of determination, the sum, without duplication, of (i) the total
amount of Indebtedness of such Person and its Restricted Subsidiaries, plus (ii)
the total amount of Indebtedness of any other Person, to the extent that such
Indebtedness has been Guaranteed by the referent Person or one or more of its
Restricted Subsidiaries, plus (iii) the aggregate liquidation value of all
Disqualified Stock of such Person and all preferred stock of Restricted
Subsidiaries of such Person, in each case, determined on a consolidated basis in
accordance with GAAP.

                  "Consolidated Net Income" means, with respect to any Person
for any period, the aggregate of the Net Income of such Person and its
Restricted Subsidiaries for such period, on a consolidated basis, determined in
accordance with GAAP; provided that (i) the Net Income (but not loss) of any
Person other than the Company that is not a Restricted Subsidiary or that is
accounted for by the equity method of accounting shall be included only to the
extent of the amount of dividends or distributions paid in cash to the referent
Person or a Restricted Subsidiary thereof, (ii) the Net Income of any Person
acquired in a pooling of interests transaction for any period prior to the date
of such acquisition shall be excluded, (iii) the cumulative effect of a change
in accounting principles shall be excluded and (iv) the Net Income (but not
loss) of any Unrestricted Subsidiary shall be excluded whether or not
distributed to the Company or one of its Restricted Subsidiaries.

                  "Consolidated Net Worth" means, with respect to any Person as
of any date of determination, stockholders' equity as set forth on the most
recently available quarterly or annual consolidated balance sheet of such Person
(which shall be as of a date not more than 90 days prior to the date of such
computation, and which shall not take into account Unrestricted Subsidiaries),
less any amounts attributable to Disqualified Stock or any equity security
convertible into or exchangeable for Indebtedness, the cost of treasury stock
and the principal amount of any promissory notes receivable from the sale of the
Capital Stock of such Person, in each case determined on a consolidated basis in
accordance with GAAP.

                  "Continuing Directors" means, as of any date of determination,
any member of the


                                       10
<PAGE>   11
Board of Directors of the Company who (i) was a member of such Board of
Directors on the date of this Indenture or (ii) was nominated for election or
elected to such Board of Directors with the approval of a majority of the
Continuing Directors who were members of such Board at the time of such
nomination or election.

                  "Corporate Trust Office of the Trustee" shall be at the
address of the Trustee specified in Section 10.02 hereof or such other address
as to which the Trustee may give notice to the Company.

                  "Credit Facilities" means one or more debt facilities or
commercial paper facilities with banks or other institutional lenders providing
for revolving credit loans, term loans, receivables financing (including through
the sale of receivables to such lenders or to special purpose entities formed to
borrow from such lenders against such receivables) or letters of credit, in each
case, as amended, restated, modified, renewed, refunded, replaced or refinanced
in whole or in part from time to time.

                  "Debt to Consolidated Cash Flow Ratio" means, as of any date
of determination (the "Calculation Date"), the ratio of (a) the Consolidated
Indebtedness of the Company as of such date to (b) the Consolidated Cash Flow of
the Company for the four most recent full fiscal quarters ending immediately
prior to the Calculation Date for which internal financial statements are
available, in each case determined on a pro forma basis after giving effect to
all acquisitions or dispositions of assets made by the Company and its
Subsidiaries from the beginning of such four-quarter period through and
including the Calculation Date as if such acquisitions and dispositions had
occurred at the beginning of such four-quarter period. For purposes of making
the computation referred to above, (i) acquisitions that have been made by the
Company or any of its Restricted Subsidiaries, including through mergers or
consolidations, during the reference period or subsequent to such reference
period and on or prior to the Calculation Date shall be deemed to have occurred
on the first day of the reference period and Consolidated Cash Flow for such
reference period shall be calculated without giving effect to clause (ii) of the
proviso set forth in definition of Consolidated Net Income, and (ii) the
Consolidated Cash Flow attributable to discontinued operations, as determined in
accordance with GAAP, and operations or businesses disposed of prior to the
Calculation Date, shall be excluded.

                  "Default" means any event that is, or with the passage of time
or the giving of notice or both would be, an Event of Default.

                  "Definitive Note" means a certificated Note registered in the
name of the Holder thereof and issued in accordance with Section 2.06 hereof, in
the form of Exhibit A-1 hereto except that such Note shall not bear the Global
Note Legend and shall not have the "Schedule of Exchanges of Interests in the
Global Note" attached thereto.

                  "Depositary" means, with respect to the Notes issuable or
issued in whole or in part in global form, the Person specified in Section 2.03
hereof as the Depositary with respect to the Notes, and any and all successors
thereto appointed as depositary hereunder and having become such pursuant to the
applicable provision of this Indenture.

                  "Disqualified Stock" means any Capital Stock that, by its
terms (or by the terms of any security into which it is convertible or for which
it is exchangeable, in each case, at the option of the holder thereof), or upon
the happening of any event, matures or is mandatorily redeemable, pursuant to a
sinking fund obligation or otherwise, or redeemable at the option of the Holder
thereof, in whole or in part, on or prior to the date that is 91 days after the
date on which the Notes mature (other than with the proceeds of an IPO
Redemption in the case of the Series B Preferred Stock); provided, however, that
any 


                                       11
<PAGE>   12
Capital Stock that would constitute Disqualified Stock solely because the
holders thereof have the right to require the Company to repurchase such Capital
Stock upon the occurrence of a Change of Control or an Asset Sale shall not
constitute Disqualified Stock if the terms of such Capital Stock provide that
the Company may not repurchase or redeem any such Capital Stock pursuant to such
provisions unless such repurchase or redemption complies with Section 4.07
hereof.

                  "Distribution Compliance Period" means the 40-day distribution
compliance period as defined in Regulation S.

                  "Eligible Indebtedness" means any Indebtedness other than (i)
Indebtedness in the form of, or represented by, bonds or other securities or any
guarantee thereof and (ii) Indebtedness that is, or may be, quoted, listed or
purchased and sold on any stock exchange, automated trading system or
over-the-counter or other securities market (including, without prejudice to the
generality of the foregoing, the market for securities eligible for resale
pursuant to Rule 144A under the Securities Act).

                  "Eligible Receivables" means the accounts receivable (net of
any reserves and allowances for doubtful accounts in accordance with GAAP) of
the Company and its Restricted Subsidiaries that are not more than 60 days past
their due date and that were entered into in the ordinary course of business on
normal payment terms as shown on the most recent internal consolidated balance
sheet of the Company and such Restricted Subsidiaries, all calculated on a
consolidated basis in accordance with GAAP.

                  "Equity Interests" means Capital Stock and all warrants,
options or other rights to acquire Capital Stock (but excluding any debt
security that is convertible into, or exchangeable for, Capital Stock).

                  "Equity Offering" means a public or private offering of Common
Stock of the Company pursuant to an effective registration statement under the
Securities Act or otherwise of which the net cash proceeds to the Company are
equal to or greater than $25,000,000.

                  "Exchange Offer" means the exchange and issuance by the
Company of a principal amount of New Notes (which shall be registered pursuant
to the Exchange Offer Registration Statement) equal to the outstanding principal
amount of Notes that are tendered by such Holders in connection with such
exchange and issuance.

                  "Exchange Offer Registration Statement" means the Registration
Statement relating to the Exchange Offer, including the related Prospectus.

                  "Existing Indebtedness" means Indebtedness of the Company and
its Subsidiaries in existence on the date of this Indenture, until such amounts
are repaid.

                  "Fair Market Value" means the price that would be paid in an
arm's-length transaction between an informed and willing seller under no
compulsion to sell and an informed and willing buyer under no compulsion to buy,
as determined in good faith by the Board of Directors, whose determination shall
be evidenced by a resolution thereof set forth in an Officers' Certificate
delivered to the Trustee; provided that for purposes of clause (ix) of Section
4.09 hereof, and only for purposes of such clause: (x) the Fair Market Value of
any security registered under the Exchange Act shall be the average of the
closing prices, regular way, of such security for the 20 consecutive trading
days immediately preceding the sale of Capital Stock and (y) in the event the
aggregate Fair Market Value of any other property


                                       12
<PAGE>   13
(other than cash or Cash Equivalents) received by the Company exceeds
$10,000,000, the Fair Market Value of such property shall be determined by a
nationally recognized investment banking firm (or, if no such investment banking
firm is qualified to issue such an opinion, by a nationally recognized appraisal
firm or public accounting firm) and set forth in the written opinion of such
firm which shall be delivered to the Trustee.

                  "GAAP" means generally accepted accounting principles set
forth in the opinions and pronouncements of the Accounting Principles Board of
the American Institute of Certified Public Accountants and statements and
pronouncements of the Financial Accounting Standards Board or in such other
statements by such other entity as have been approved by a significant segment
of the accounting profession, which are in effect from time to time.

                  "Global Note Legend" means the legend set forth in Section
2.06(g)(ii) hereof, which is required to be placed on all Global Notes issued
under this Indenture.

                  "Global Notes" means, individually and collectively, each of
the Restricted Global Note and the Unrestricted Global Note, in the form of
Exhibit A hereto issued in accordance with Section 2.01, 2.06(b)(iv),
2.06(d)(ii) or 2.06(f) hereof.

                  "Guarantee" means a guarantee (other than by endorsement of
negotiable instruments for collection in the ordinary course of business),
direct or indirect, in any manner (including, without limitation, by way of a
pledge of assets or through letters of credit or reimbursement agreements in
respect thereof), of all or any part of any Indebtedness.

                  "Hedging Obligations" means, with respect to any Person, the
obligations of such Person under (i) interest rate swap agreements, interest
rate cap agreements and interest rate collar agreements and (ii) other
agreements or arrangements designed to protect such Person against fluctuations
in interest rates or currency exchange rates.

                  "Holder" means a Person in whose name a Note is registered.

                  "Indebtedness" means, with respect to any Person, any
indebtedness of such Person, whether or not contingent, in respect of borrowed
money or evidenced by bonds, notes, debentures or similar instruments or letters
of credit (or reimbursement agreements in respect thereof) or banker's
acceptances or representing Capital Lease Obligations or the balance deferred
and unpaid of the purchase price of any property or representing any Hedging
Obligations, except any such balance that constitutes an accrued expense or
trade payable, if and to the extent any of the foregoing indebtedness (other
than letters of credit and Hedging Obligations) would appear as a liability upon
a balance sheet of such Person prepared in accordance with GAAP, as well as all
Indebtedness of others secured by a Lien on any asset of such Person whether or
not such Indebtedness is assumed by such Person (the amount of such Indebtedness
as of any date being deemed to be the lesser of the value of such property or
assets as of such date or the principal amount of such Indebtedness of such
other Person so secured) and, to the extent not otherwise included, the
Guarantee by such Person of any Indebtedness of any other Person. The amount of
any Indebtedness outstanding as of any date shall be (i) the accreted value
thereof, in the case of any Indebtedness issued with original issue discount,
and (ii) the principal amount thereof in the case of any other Indebtedness.

                  "Indenture" means this Indenture, as amended or supplemented
from time to time.


                                       13
<PAGE>   14
                  "Indirect Participant" means a Person who holds a beneficial
interest in a Global Note through a Participant.

                  "Initial Purchasers" means Lehman Brothers Inc. and BT Alex.
Brown Incorporated.

                  "Institutional Accredited Investor" means an institution that
is an "accredited investor" as defined in Rule 501(a)(1),(2),(3) or (7) under
the Securities Act.

                  "Investments" means, with respect to any Person, all
investments by such Person in other Persons (including Affiliates) in the form
of direct or indirect loans (including guarantees of Indebtedness or other
obligations), advances or capital contributions (excluding commission, travel
and similar advances to officers and employees made in the ordinary course of
business), purchases or other acquisitions for consideration of Indebtedness,
Equity Interests or other securities, together with all items that are or would
be classified as investments on a balance sheet prepared in accordance with
GAAP. If the Company or any Restricted Subsidiary of the Company sells or
otherwise disposes of any Equity Interests of any direct or indirect Subsidiary
of the Company or a Restricted Subsidiary of the Company issues any of its
Equity Interests such that, in each case, after giving effect to any such sale
or disposition, such Person is no longer a Restricted Subsidiary of the Company,
the Company shall be deemed to have made an Investment on the date of any such
sale or disposition equal to the Fair Market Value of the Equity Interests of
such Subsidiary not sold or disposed of in an amount determined as provided in
the final paragraph of Section 4.07 hereof.

                  "IPO Redemption" means a redemption, from any source of funds
legally available therefor, of all of the Series B Preferred Stock in the event
of and concurrently with the closing of a firmly underwritten public offering of
the Company's Common Stock pursuant to an effective registration statement under
the Securities Act, with gross cash proceeds to the Company (before underwriting
discounts, commissions and fees) of not less than $30,000,000.

                  "Legal Holiday" means a Saturday, a Sunday or a day on which
banking institutions in the City of New York or at a place of payment are
authorized by law, regulation or executive order to remain closed. If a payment
date is a Legal Holiday at a place of payment, payment may be made at that place
on the next succeeding day that is not a Legal Holiday, and no interest shall
accrue on such payment for the intervening period.

                  "Letter of Transmittal" means the letter of transmittal to be
prepared by the Company and sent to all Holders of the Notes for use by such
Holders in connection with the Exchange Offer.

                  "Lien" means, with respect to any asset, any mortgage, lien,
pledge, charge, security interest or encumbrance of any kind in respect of such
asset, whether or not filed, recorded or otherwise perfected under applicable
law (including any conditional sale or other title retention agreement, any
lease in the nature thereof, any option or other agreement to sell or give a
security interest in and any filing of or agreement to give any financing
statement under the Uniform Commercial Code (or equivalent statutes) of any
jurisdiction).

                  "Liquidated Damages" means the amount payable by the Company
to each Holder under the circumstances set forth in and pursuant to Section 5 of
the Registration Rights Agreement.

                  "Net Income" means, with respect to any Person, the net income
(loss) of such Person, determined in accordance with GAAP and before any
reduction in respect of preferred stock dividends, 


                                       14
<PAGE>   15
excluding, however, (i) any gain or loss, together with any related provision
for taxes on such gain or loss, realized in connection with (a) any Asset Sale
(including, without limitation, dispositions pursuant to sale and leaseback
transactions) or (b) the disposition of any securities by such Person or any of
its Restricted Subsidiaries or the extinguishment of any Indebtedness of such
Person or any of its Restricted Subsidiaries and (ii) any extraordinary gain or
loss, together with any related provision for taxes on such extraordinary gain
or loss.

                  "Net Proceeds" means the aggregate cash proceeds received by
the Company or any of its Restricted Subsidiaries in respect of any Asset Sale
(including, without limitation, any cash received upon the sale or other
disposition of any non-cash consideration received in any Asset Sale), net of
(i) the direct costs relating to such Asset Sale (including, without limitation,
legal, accounting and investment banking fees, and sales commissions) and any
relocation expenses incurred as a result thereof, (ii) taxes paid or payable as
a result thereof (after taking into account any available tax credits or
deductions and any tax sharing arrangements), (iii) amounts required to be
applied to the repayment of Indebtedness (other than Indebtedness under a Credit
Facility) secured by a Lien on the asset or assets that were the subject of such
Asset Sale, (iv) all distributions and other payments required to be made to
minority interest holders in Restricted Subsidiaries as a result of such Asset
Sale, (v) the deduction of appropriate amounts provided by the seller as a
reserve in accordance with GAAP against any liabilities associated with the
assets disposed of in such Asset Sale and retained by the Company or any
Restricted Subsidiary after such Asset Sale and (vi) without duplication, any
reserves that the Company's Board of Directors determines in good faith should
be made in respect of the sale price of such asset or assets for post closing
adjustments; provided that in the case of any reversal of any reserve referred
to in clause (v) or (vi) above, the amount so reserved shall be deemed to be Net
Proceeds from an Asset Sale as of the date of such reversal.

                  "New Notes" means the Company's 14% Senior Notes due 2008,
Series B, to be issued pursuant to this Indenture: (i) in the Exchange Offer or
(ii) as contemplated by Section 4 of the Registration Rights Agreement.

                  "Non-Recourse Debt" means Indebtedness (i) as to which neither
the Company nor any of its Restricted Subsidiaries (a) provides credit support
of any kind (including any undertaking, agreement or instrument that would
constitute Indebtedness), (b) is directly or indirectly liable (as a guarantor
or otherwise), or (c) constitutes the lender and (ii) no default with respect to
which (including any rights that the holders thereof may have to take
enforcement action against an Unrestricted Subsidiary) would permit (upon
notice, lapse of time or both) any holder of any other Indebtedness of the
Company or any of its Restricted Subsidiaries to declare a default on such other
Indebtedness or cause the payment thereof to be accelerated or payable prior to
its stated maturity; and (iii) as to which the lenders have been notified in
writing that they will not have any recourse to the stock or assets of the
Company or any of its Restricted Subsidiaries.

                  "Non-U.S. Person"  means a Person who is not a U.S. Person.

                  "Notes" has the meaning assigned to it in the preamble to this
Indenture.

                  "Obligations" means any principal, interest, penalties, fees,
indemnifications, reimbursements, damages and other liabilities payable under
the documentation governing any Indebtedness.

                  "Offering" means the offering of the Notes by the Company.


                                       15
<PAGE>   16
                  "Officer" means, with respect to any Person, the Chairman of
the Board, the Chief Executive Officer, the President, the Chief Operating
Officer, the Chief Financial Officer, the Treasurer, any Assistant Treasurer,
the Controller, the Secretary or any Vice-President of such Person.

                  "Officers' Certificate" means a certificate signed on behalf
of the Company by two Officers of the Company, one of whom must be the principal
executive officer, the principal financial officer, the treasurer or the
principal accounting officer of the Company, that meets the requirements of
Section 11.05 hereof.

                  "Opinion of Counsel" means an opinion from legal counsel who
is reasonably acceptable to the Trustee, that meets the requirements of Section
10.05 hereof. The counsel may be an employee of or counsel to the Company, any
Subsidiary of the Company or the Trustee.

                  "Participant" means, with respect to the Depositary, Euroclear
or Cedel, a Person who has an account with the Depositary, Euroclear or Cedel,
respectively (and, with respect to The Depository Trust Company, shall include
Euroclear and Cedel).

                  "Participating Broker-Dealer" has the meaning set forth in the
Registration Rights Agreement.

                  "Permitted Group" means any group of investors that is deemed
to be a "person" (as such term is used in Section 13(d)(3) of the Exchange Act)
by virtue of the Purchasers Rights Agreement, as the same may be amended,
modified or supplemented from time to time, provided that no single Person
(together with its Affiliates), other than the Principals and their Related
Parties, is the "beneficial owner" (as such term is defined in Rule 13d-3 and
Rule 13d-5 under the Exchange Act, except that a person shall be deemed to have
"beneficial ownership" of all securities that such person has the right to
acquire, whether such right is currently exercisable or is exercisable only upon
the occurrence of a subsequent condition, and beneficial ownership shall be
determined without regard to the Purchasers Rights Agreement, as the same may be
amended, modified or supplemented from time to time), directly or indirectly, of
(A) more than 40% of the Voting Stock of the Company that is "beneficially
owned" (as defined above) by such group of investors and (B) more of the Voting
Stock of the Company than is at the time "beneficially owned" (as defined above)
by the Principals and their Related Parties in the aggregate (Voting Stock, in
each case, measured by voting power rather than number of shares).

                  "Permitted Investments" means (a) any Investment in the
Company or in a Restricted Subsidiary of the Company; (b) any Investment in Cash
Equivalents or Pledged Securities; (c) any Investment by the Company or any
Restricted Subsidiary of the Company in a Person, if as a result of such
Investment (i) such Person becomes a Restricted Subsidiary of the Company or
(ii) such Person is merged, consolidated or amalgamated with or into, or
transfers or conveys substantially all of its assets to, or is liquidated into,
the Company or a Restricted Subsidiary of the Company; (d) any Restricted
Investment made as a result of the receipt of non-cash consideration from an
Asset Sale that was made pursuant to and in compliance with Section 4.10 hereof;
(e) any acquisition of assets to the extent that the consideration therefor
consists of Equity Interests (other than Disqualified Stock) of the Company; (f)
receivables created in the ordinary course of business; (g) loans or advances to
employees made in the ordinary course of business not to exceed $500,000 at any
one time outstanding; (h) securities and other assets received in settlement of
trade debts or other claims arising in the ordinary course of business; (i)
Guarantees permitted by Section 4.09 hereof; (j) Investments in prepaid
expenses, negotiable instruments held for collection and lease, utility and
workers' compensation, performance and other similar deposits; (k) Investments
in Permitted Joint Ventures in an amount not to exceed 


                                       16
<PAGE>   17
$10,000,000 at any one time outstanding; and (1) other Investments not to exceed
5% of the Company's Consolidated Assets at any one time outstanding (each such
Investment being measured as of the date made without giving effect to
subsequent changes in value).

                  "Permitted Joint Venture" means any corporation, partnership
or other entity engaged in one or more Telecommunications Businesses (i) of
which the Company owns, directly or indirectly, at least 45% of the outstanding
Capital Stock and (ii) that is managed and operated by the Company or any of its
Subsidiaries.

                  "Permitted Liens" means (i) Liens securing Indebtedness of the
Company under one or more Credit Facilities that was permitted by the terms of
this Indenture to be incurred; (ii) Liens on the property or assets of one or
more Restricted Subsidiaries of the Company securing Indebtedness of one or more
Restricted Subsidiaries of the Company that was permitted by the terms of this
Indenture to be incurred; (iii) Liens in favor of the Company; (iv) Liens
existing on the date of this Indenture; (v) Liens for taxes, assessments or
governmental charges or claims that are not yet delinquent or that are being
contested in good faith by appropriate proceedings promptly instituted and
diligently concluded, provided that any reserve or other appropriate provision
as shall be required in conformity with GAAP shall have been made therefor; (vi)
Liens securing Indebtedness permitted to be incurred under clause (iv) of the
second paragraph of Section 4.09 hereof provided that (A) any such Lien is
created solely for the purpose of securing Indebtedness (1) to finance the cost
(including the cost of design, development, acquisition, construction,
installation, improvement, transportation or integration) of the item of
property or assets subject thereto and such Lien is created prior to, at the
time of or within six months after the later of the acquisition, the completion
of construction or the commencement of full operation of such property or (2) to
refinance any Indebtedness previously so secured, (B) the principal amount of
the Indebtedness secured by such Lien does not exceed 100% of such cost and (C)
such Lien does not extend to or cover any property or assets other than such
item of property or assets and any improvements on such item; (vii) Liens on
property of a Person existing at the time such Person is merged into or
consolidated with the Company or any Subsidiary; provided that such Liens were
in existence prior to the contemplation of such merger or consolidation and do
not extend to any assets other than those of the Person merged into or
consolidated with the Company or such Subsidiary; (viii) Liens on property
existing at the time of acquisition thereof by the Company or any Subsidiary,
provided that such Liens were in existence prior to the contemplation of such
acquisition; (ix) Liens to secure the performance of statutory obligations,
surety or appeal bonds, performance bonds or other obligations of a like nature
incurred in the ordinary course of business; (x) Liens securing the Notes, the
New Notes and this Indenture or any guarantee thereof; (xi) Liens granted in
favor of the Holders of the Notes; and (xii) Liens incurred in the ordinary
course of business of the Company or any Restricted Subsidiary of the Company
with respect to obligations that do not exceed $10,000,000 at any one time
outstanding.

                  "Permitted Refinancing Indebtedness" means any Indebtedness of
the Company or any of its Restricted Subsidiaries issued in exchange for, or the
net proceeds of which are used to extend, refinance, renew, replace, defease or
refund other Indebtedness of the Company or any of its Restricted Subsidiaries
(other than intercompany Indebtedness); provided that: (i) the principal amount
(or initial accreted value, if applicable) of such Permitted Refinancing
Indebtedness does not exceed the principal amount of (or accreted value, if
applicable), plus accrued interest on, the Indebtedness so extended, refinanced,
renewed, replaced, defeased or refunded (plus the amount of expenses and
prepayment premiums incurred in connection therewith); (ii) such Permitted
Refinancing Indebtedness has a final maturity date later than the final maturity
date of, and has a Weighted Average Life to Maturity equal to or greater than
the Weighted Average Life to Maturity of, the Indebtedness being extended,
refinanced, renewed, 


                                       17
<PAGE>   18
replaced, defeased or refunded; (iii) if the Indebtedness being extended,
refinanced, renewed, replaced, defeased or refunded is subordinated in right of
payment to the Notes, such Permitted Refinancing Indebtedness is subordinated in
right of payment to the Notes on terms at least as favorable to the Holders of
Notes as those contained in the documentation governing the Indebtedness being
extended, refinanced, renewed, replaced, defeased or refunded; and (iv) such
Indebtedness is incurred either by the Company or by the Restricted Subsidiary
who is the obligor on the Indebtedness being extended, refinanced, renewed,
replaced, defeased or refunded.

                  "Person" means any individual, corporation, partnership, joint
venture, association, joint-stock company, trust, unincorporated organization or
government or agency or political subdivision thereof (including any subdivision
or ongoing business of any such entity or substantially all of the assets of any
such entity, subdivision or business).

                  "Pledge Account" means an account established with the Trustee
pursuant to the terms of the Pledge Agreement for the deposit of the Pledged
Securities purchased by the Company with a portion of the net proceeds from the
Offering.

                  "Pledge Agreement" means the Collateral Pledge and Security
Agreement, dated as of the date of this Indenture, from the Company to the
Trustee, governing the Pledge Account and the disbursement of funds therefrom.

                  "Pledged Securities" means the securities purchased by the
Company with a portion of the net proceeds from the Offering, which shall
consist of U.S. Government Obligations, to be deposited in the Pledge Account.
The Pledged Securities may be held in book-entry form through Bankers Trust
Company, acting as securities intermediary.

                  "Principal" means Henry H. Bradley, David E. Scott and Jeffrey
D. Shackelford.

                  "Private Placement Legend" means the legend set forth in
Section 2.06(g)(i) hereof to be placed on all Notes issued under this Indenture
except where otherwise permitted by the provisions of this Indenture.

                  "Prospectus" means the prospectus included in a Registration
Statement at the time such Registration Statement is declared effective, as
amended or supplemented by any prospectus supplement and by all other amendments
thereto, including post-effective amendments, and all material incorporated by
reference into such Prospectus.

                  "Public Equity Offering" means an underwritten primary public
offering of Common Stock of the Company pursuant to an effective registration
statement under the Securities Act.

                  A "Public Market" shall be deemed to exist if (i) a Public
Equity Offering has been consummated and (ii) at least 35% of the total issued
and outstanding Common Stock of the Company immediately prior to the
consummation of the Public Equity Offering has been distributed by means of an
effective registration statement under the Securities Act.

                  "Purchasers Rights Agreement" means the Purchasers Rights
Agreement dated February 10, 1998 between the Company and the then current
shareholders of the Company named as parties therein.

                  "QIB" means a "qualified institutional buyer" as defined in
Rule 144A.


                                       18
<PAGE>   19
                  "Registration Rights Agreement" means the Registration Rights
Agreement, dated as of the date of this Indenture, by and among the Company and
the Initial Purchasers as such agreement may be amended, modified or
supplemented from time to time.

                  "Registration Statement" means any registration statement of
the Company relating to (a) an offering of New Notes pursuant to an Exchange
Offer or (b) the registration for resale of Transfer Restricted Securities
pursuant to the Shelf Registration Statement, in each case, (i) that is filed
pursuant to the provisions of the Registration Rights Agreement and (ii)
including the Prospectus included therein, all amendments and supplements
thereto (including post-effective amendments) and all exhibits and material
incorporated by reference therein.

                  "Regulation S" means Regulation S under the Securities Act.

                  "Regulation S Global Note" means a Regulation S Temporary
Global Note or Regulation S Permanent Global Note, as appropriate.

                  "Regulation S Permanent Global Note" means a permanent global
Note in the form of Exhibit A-1 hereto bearing the Global Note Legend and the
Private Placement Legend and deposited with or on behalf of and registered in
the name of the Depositary or its nominee, issued in a denomination equal to the
outstanding principal amount of the Regulation S Temporary Global Note upon
expiration of the Distribution Compliance Period.

                  "Regulation S Temporary Global Note" means a temporary global
Note in the form of Exhibit A-2 hereto bearing the Private Placement Legend and
deposited with or on behalf of and registered in the name of the Depositary or
its nominee, issued in a denomination equal to the outstanding principal amount
of the Notes initially sold in reliance on Rule 903 of Regulation S.

                  "Related Party" with respect to any Principal means (a) (1)
any spouse, sibling, parent or child of such Principal or (2) the estate of any
Principal during any period in which such estate holds Equity Interests of the
Company for the benefit of any person referred to in clause (a)(1), or (b) any
trust, corporation, partnership or other entity, the beneficiaries,
stockholders, partners, owners or Persons beneficially owning an interest of
more than 50% of which consist of such Principal and/or such other Persons
referred to in the immediately preceding clause (a).

                  "Responsible Officer" when used with respect to the Trustee,
means any officer within the Corporate Trust Administration of the Trustee (or
any successor group of the Trustee) or any other officer of the Trustee
customarily performing functions similar to those performed by any of the above
designated officers and also means, with respect to a particular corporate trust
matter, any other officer to whom such matter is referred because of his
knowledge of and familiarity with the particular subject.

                  "Restricted Definitive Note" means a Definitive Note bearing
the Private Placement Legend.

                  "Restricted Global Note" means a Global Note bearing the
Private Placement Legend.

                  "Restricted Investment" means an Investment other than a
Permitted Investment.

                  "Restricted Subsidiary" of a Person means any Subsidiary of
the referent Person that is not an Unrestricted Subsidiary.


                                       19
<PAGE>   20
                  "Rule 144" means Rule 144 promulgated under the Securities
Act.

                  "Rule 144A" means Rule 144A promulgated under the Securities
Act.

                  "Rule 903" means Rule 903 of Regulation S promulgated under
the Securities Act.

                  "Rule 904" means Rule 904 of Regulation S promulgated under
the Securities Act.

                  "SEC" means the Securities and Exchange Commission.

                  "Securities Act" means the Securities Act of 1933, as amended.

                  "Series B Preferred Stock" means the shares of Capital Stock
of the Company designated as "Series B Preferred Stock", par value $0.001 per
share, in the Company's Amended and Restated Certificate of Incorporation as in
effect on the date of this Indenture.

                  "Shelf Registration Statement" means the Shelf Registration
Statement as defined in the Registration Rights Agreement.

                  "Significant Subsidiary" means, with respect to any person,
any Restricted Subsidiary of such Person that would be a "significant
subsidiary" of such Person as defined in Article 1, Rule 1-02 of Regulation S-X,
promulgated pursuant to the Securities Act, as such Regulation is in effect on
the date of this Indenture, except that all references to "10 percent" in Rule
1-02(w)(1), (2) and (3) shall mean "5 percent."

                  "Stated Maturity" means, with respect to any installment of
interest or principal on any series of Indebtedness, the date on which such
payment of interest or principal was scheduled to be paid in the original
documentation governing such Indebtedness, and shall not include any contingent
obligations to repay, redeem or repurchase any such interest or principal prior
to the date originally scheduled for the payment thereof.

                  "Subsidiary" means, with respect to any Person, (i) any
corporation, association or other business entity of which more than 50% of the
total voting power of shares of Capital Stock entitled (without regard to the
occurrence of any contingency) to vote in the election of directors, managers or
trustees thereof is at the time owned or controlled, directly or indirectly, by
such Person or one or more of the other Subsidiaries of such Person (or a
combination thereof) and (ii) any partnership (a) the sole general partner or
the managing general partner of which is such Person or a Subsidiary of such
Person or (b) the only general partners of which are such Person or one or more
Subsidiaries of such Person (or any combination thereof).

                  "Telecommunications Business" means any business engaged
primarily in the development, ownership or operation of one or more telephone,
telecommunications or information systems or the provision of telephony,
telecommunications or information services (including, without limitation, any
voice, video transmission, data or Internet services) and any related, ancillary
or complementary business; provided that the determination of what constitutes a
Telecommunications Business shall be made in good faith by the Board of
Directors.

                  "TIA" means the Trust Indenture Act of 1939 (15 U.S.C.
Sections 77aaa-77bbbb) as in effect on the date on which this Indenture is
qualified under the TIA.


                                       20
<PAGE>   21
                  "Transfer Restricted Securities" means each Note, until the
earliest to occur of (a) the date on which such Note is exchanged in the
Exchange Offer and entitled to be resold to the public by the Holder thereof
without complying with the prospectus delivery requirements of the Securities
Act, (b) the date on which such Note has been disposed of in accordance with a
Shelf Registration Statement, (c) the date on which such Note is disposed of by
a Broker-Dealer pursuant to the "Plan of Distribution" contemplated by the
Exchange Offer Registration Statement (including delivery of the Prospectus
contained therein) or (d) the date on which such Note is distributed to the
public pursuant to Rule 144 or is eligible for resale pursuant to Rule 144(k)
under the Securities Act.

                  "Trustee" means the party named as such above until a
successor replaces it in accordance with the applicable provisions of this
Indenture and thereafter means the successor serving hereunder.

                  "Unrestricted Definitive Note" means one or more Definitive
Notes that do not bear and are not required to bear the Private Placement
Legend.

                  "Unrestricted Global Note" means a permanent global Note in
the form of Exhibit A-1 attached hereto that bears the Global Note Legend and
that has the "Schedule of Exchanges of Interests in the Global Note" attached
thereto, and that is deposited with or on behalf of and registered in the name
of the Depositary, representing a series of Notes that do not bear the Private
Placement Legend.

                  "Unrestricted Subsidiary" means (i) any Subsidiary of the
Company that is designated by the Board of Directors as an Unrestricted
Subsidiary pursuant to a Board Resolution; but only to the extent that such
Subsidiary: (a) has no Indebtedness other than Non-Recourse Debt; (b) is not
party to any agreement, contract, arrangement or understanding with the Company
or any Restricted Subsidiary of the Company unless the terms of any such
agreement, contract, arrangement or understanding are no less favorable to the
Company or such Restricted Subsidiary than those that might be obtained at the
time from Persons who are not Affiliates of the Company; (c) is a Person with
respect to which neither the Company nor any of its Restricted Subsidiaries has
any direct or indirect obligation (x) to subscribe for additional Equity
Interests or (y) to maintain or preserve such Person's financial condition or to
cause such Person to achieve any specified levels of operating results; (d) has
not guaranteed or otherwise directly or indirectly provided credit support for
any Indebtedness of the Company or any of its Restricted Subsidiaries; and (e)
has at least one director on its board of directors that is not a director or
executive officer of the Company or any of its Restricted Subsidiaries and has
at least one executive officer that is not a director or executive officer of
the Company or any of its Restricted Subsidiaries. Any such designation by the
Board of Directors shall be evidenced to the Trustee by filing with the Trustee
a certified copy of the Board Resolution giving effect to such designation and
an Officers' Certificate certifying that such designation complied with the
foregoing conditions and was permitted by Section 4.07 hereof. If, at any time,
any Unrestricted Subsidiary would fail to meet the foregoing requirements as an
Unrestricted Subsidiary, it shall thereafter cease to be Unrestricted Subsidiary
for purposes of this Indenture and any Indebtedness of such Subsidiary shall be
deemed to be incurred by a Restricted Subsidiary of the Company as of such date
(and, if such Indebtedness is not permitted to be incurred as of such date under
Section 4.09 hereof, the Company shall be in default of such Section). The Board
of Directors of the Company may at any time designate any Unrestricted
Subsidiary to be a Restricted Subsidiary; provided that such designation shall
be deemed to be an incurrence of Indebtedness by a Restricted Subsidiary of the
Company of any outstanding Indebtedness of such Unrestricted Subsidiary and such
designation shall only be permitted if (i) such Indebtedness is permitted under
Section 4.09 hereof, calculated on a pro forma basis as if such designation had
occurred at the beginning of the four-quarter reference period, and (ii) no
Default or Event of Default would occur or be


                                       21
<PAGE>   22
in existence following such designation.

                  "U.S. Government Obligations" means securities that are (x)
direct obligations of the United States of America for the timely payment of
which its full faith and credit is pledged or (y) obligations of a Person
controlled or supervised by and acting as an agency or instrumentality of the
United States of America, the timely payment of which is unconditionally
guaranteed as a full faith and credit obligation by the United States of
America, which, in either case, are not callable or redeemable at the option of
the issuer thereof, and shall also include a depository receipt issued by a
"bank" (as defined in Section 3(a)(2) of the Securities Act), as custodian with
respect to any such U.S. Government Obligation or a specific payment of
principal of or interest on any such U.S. Government Obligation held by such
custodian for the account of the holder of such depository receipt, provided
(except as required by law) such custodian is not authorized to make any
deduction from the amount payable to the holder of such depository receipt from
any amount received by the custodian in respect of the U.S. Government
Obligation or the specific payment of principal of or interest on the U.S.
Government Obligation evidenced by such depository receipt.

                  "U.S. Person" means a U.S. person as defined in Rule 902(k)
under the Securities Act.

                  "Voting Stock" of any Person as of any date means the Capital
Stock of such Person that is at the time entitled to vote in the election of the
Board of Directors of such Person.

                  "Weighted Average Life to Maturity" means, when applied to any
Indebtedness at any date, the number of years obtained by dividing (a) the sum
of the products obtained by multiplying (x) the amount of each then remaining
installment, sinking fund, serial maturity or other required payments of
principal, including payment at final maturity, in respect thereof, by (y) the
number of years (calculated to the nearest one-twelfth) that will elapse between
such date and the making of such payment, by (b) the then outstanding principal
amount of such Indebtedness.

                  "Wholly Owned Restricted Subsidiary" of any Person means a
Restricted Subsidiary of such Person all of the outstanding Capital Stock or
other ownership interests of which (other than directors' qualifying shares)
shall at the time be owned by such Person or by one or more Wholly Owned
Restricted Subsidiaries of such Person and one or more Wholly Owned Restricted
Subsidiaries of such Person.

SECTION 1.02.     OTHER DEFINITIONS.

                                                         Defined in
      Term                                                Section

"Affiliate Transaction"                                     4.11
"Asset Sale Offer"                                          3.09
"Authentication Order"                                      2.02
"Change of Control Offer"                                   4.15
"Change of Control Payment"                                 4.15
"Change of Control Payment Date"                            4.15
"Covenant Defeasance"                                       8.03
"Event of Default"                                          6.01
"Excess Proceeds"                                           4.10
"incur"                                                     4.09


                                       22
<PAGE>   23
"Legal Defeasance"                                          8.02
"Offer Amount"                                              3.09
"Offer Period"                                              3.09
"Paying Agent"                                              2.03
"Payment Default"                                           6.01
"Permitted Debt"                                            4.09
"Purchase Date"                                             3.09
"Registrar"                                                 2.03
"Restricted Payments"                                       4.07

SECTION 1.03.     INCORPORATION BY REFERENCE OF TIA.



                  Whenever this Indenture refers to a provision of the TIA, the
provision is incorporated by reference in and made a part of this Indenture.

                  The following TIA terms used in this Indenture have the
following meanings:

                  "indenture securities" means the Notes;

                  "indenture security Holder" means a Holder of a Note;

                  "indenture to be qualified" means this Indenture;

                  "indenture trustee" or "institutional trustee" means the
Trustee; and

                  "obligor" on the Notes means the Company and any successor
obligor upon the Notes.

                  All other terms used in this Indenture that are defined by the
TIA, defined by TIA reference to another statute or defined by SEC rule under
the TIA have the meanings so assigned to them.

SECTION 1.04.     RULES OF CONSTRUCTION.

                  Unless the context otherwise requires:

                      (1)  a term has the meaning assigned to it;

                      (2) an accounting term not otherwise defined has the
                  meaning assigned to it in accordance with GAAP;

                      (3)  "or" is not exclusive;

                      (4) words in the singular include the plural, and in the
                  plural include the singular; 
                      (5) provisions apply to successive events and 
                  transactions; and 
                      (6) references to sections of or rules under the
                  Securities Act shall be deemed to include substitute,
                  replacement or successor sections or rules adopted by the SEC
                  from time to time.

                                   ARTICLE 2.
                                    THE NOTES


                                       23
<PAGE>   24
SECTION 2.01.     FORM AND DATING.

                  (a)      General.

                  The Notes and the Trustee's certificate of authentication
shall be substantially in the form of Exhibit A hereto. The Notes may have
notations, legends or endorsements required by law, stock exchange rule or
usage. Each Note shall be dated the date of its authentication. The Notes shall
be in denominations of $1,000 and integral multiples thereof.

                  The terms and provisions contained in the Notes shall
constitute, and are hereby expressly made, a part of this Indenture and the
Company and the Trustee, by their execution and delivery of this Indenture,
expressly agree to such terms and provisions and to be bound thereby. However,
to the extent any provision of any Note conflicts with the express provisions of
this Indenture, the provisions of this Indenture shall govern and be
controlling.

                  (b)      Global Notes.

                  Notes issued in global form shall be substantially in the form
of Exhibit A-1 or A-2 attached hereto (including the Global Note Legend thereon
and the "Schedule of Exchanges of Interests in the Global Note" attached
thereto). Notes issued in definitive form shall be substantially in the form of
Exhibit A-1 attached hereto (but without the Global Note Legend thereon and
without the "Schedule of Exchanges of Interests in the Global Note" attached
thereto). Each Global Note shall represent such of the outstanding Notes as
shall be specified therein and each shall provide that it shall represent the
aggregate principal amount of outstanding Notes from time to time endorsed
thereon and that the aggregate principal amount of outstanding Notes represented
thereby may from time to time be reduced or increased, as appropriate, to
reflect exchanges and redemptions. Any endorsement of a Global Note to reflect
the amount of any increase or decrease in the aggregate principal amount of
outstanding Notes represented thereby shall be made by the Trustee, in
accordance with instructions given by the Holder thereof as required by Section
2.06 hereof.

                  (c)      Temporary Global Notes.

                  Notes offered and sold in reliance on Regulation S shall be
issued initially in the form of the Regulation S Temporary Global Note, which
shall be deposited on behalf of the purchasers of the Notes represented thereby
with the Trustee, at its New York office, as custodian for the Depositary, and
registered in the name of the Depositary or the nominee of the Depositary for
the accounts of designated agents holding on behalf of Euroclear or Cedel, duly
executed by the Company and authenticated by the Trustee as hereinafter
provided. At any time on or after the later of (x) the Separation Date and (y)
the termination of the Distribution Compliance Period and upon the receipt by
the Trustee of (i) a written certificate from the Depositary, together with
copies of certificates from Euroclear and Cedel certifying that they have
received certification of non-United States beneficial ownership of 100% of the
aggregate principal amount of the Regulation S Temporary Global Note (except to
the extent of any beneficial owners thereof who acquired an interest therein
during the Distribution Compliance Period pursuant to another exemption from
registration under the Securities Act and who will take delivery of a beneficial
ownership interest in a 144A Global Note bearing a Private Placement Legend, all
as contemplated by Section 2.06(a)(ii) hereof), and (ii) an Officers'
Certificate from the Company, beneficial interests in the Regulation S Temporary
Global Note shall be exchanged for beneficial interests in Regulation S
Permanent Global Notes pursuant to the Applicable Procedures. Simultaneously
with the authentication of Regulation S Permanent Global Notes, the Trustee
shall cancel the Regulation S Temporary Global 


                                       24
<PAGE>   25
Note. The aggregate principal amount of the Regulation S Temporary Global Note
and the Regulation S Permanent Global Notes may from time to time be increased
or decreased by adjustments made on the records of the Trustee and the
Depositary or its nominee, as the case may be, in connection with transfers of
interest as hereinafter provided.

                  (d)      Euroclear and Cedel Procedures Applicable.

                  The provisions of the "Operating Procedures of the Euroclear
System" and "Terms and Conditions Governing Use of Euroclear" and the "General
Terms and Conditions of Cedel Bank" and "Customer Handbook" of Cedel shall be
applicable to transfers of beneficial interests in the Regulation S Temporary
Global Note and the Regulation S Permanent Global Notes that are held by
Participants through Euroclear or Cedel.

SECTION 2.02.     EXECUTION AND AUTHENTICATION.

                  One Officer shall sign the Notes for the Company by manual or
facsimile signature.

                  If an Officer whose signature is on a Note no longer holds
that office at the time a Note is authenticated, the Note shall nevertheless be
valid.

                  A Note shall not be valid until authenticated by the manual
signature of the Trustee. The signature shall be conclusive evidence that the
Note has been authenticated under this Indenture.

                  The Trustee shall, upon a written order of the Company signed
by one Officer (an "Authentication Order"), authenticate Notes for original
issue up to the aggregate principal amount stated in paragraph 4 of the Notes.
The aggregate principal amount of Notes outstanding at any time may not exceed
such amount except as provided in Section 2.07 hereof.

                  The Trustee may appoint an authenticating agent acceptable to
the Company to authenticate Notes. An authenticating agent may authenticate
Notes whenever the Trustee may do so. Each reference in this Indenture to
authentication by the Trustee includes authentication by such agent. An
authenticating agent has the same rights as an Agent to deal with Holders or an
Affiliate of the Company.

SECTION 2.03.     REGISTRAR AND PAYING AGENT.

                  The Company shall maintain an office or agency where Notes may
be presented for registration of transfer or for exchange ("Registrar") and an
office or agency where Notes may be presented for payment ("Paying Agent"). The
Registrar shall keep a register of the Notes and of their transfer and exchange.
The Company may appoint one or more co-registrars and one or more additional
paying agents. The term "Registrar" includes any co-registrar and the term
"Paying Agent" includes any additional paying agent. The Company may change any
Paying Agent or Registrar without notice to any Holder. The Company shall notify
the Trustee in writing of the name and address of any Agent not a party to this
Indenture. If the Company fails to appoint or maintain another entity as
Registrar or Paying Agent, the Trustee shall act as such. The Company or any of
its Subsidiaries may act as Paying Agent or Registrar.

                  The Company initially appoints The Depository Trust Company
("DTC") to act as Depositary with respect to the Global Notes.


                                       25
<PAGE>   26
                  The Company initially appoints the Trustee to act as the
Registrar and Paying Agent and to act as custodian with respect to the Global
Notes.

SECTION 2.04.     PAYING AGENT TO HOLD MONEY IN TRUST.

                  The Company shall require each Paying Agent other than the
Trustee to agree in writing that the Paying Agent will hold in trust for the
benefit of Holders or the Trustee all money held by the Paying Agent for the
payment of principal, premium or Liquidated Damages, if any, or interest on the
Notes, and will notify the Trustee of any default by the Company in making any
such payment. While any such default continues, the Trustee may require a Paying
Agent to pay all money held by it to the Trustee. The Company at any time may
require a Paying Agent to pay all money held by it to the Trustee. Upon payment
over to the Trustee, the Paying Agent (if other than the Company or a
Subsidiary) shall have no further liability for the money. If the Company or a
Subsidiary acts as Paying Agent, it shall segregate and hold in a separate trust
fund for the benefit of the Holders all money held by it as Paying Agent. Upon
any bankruptcy or reorganization proceedings relating to the Company, the
Trustee shall serve as Paying Agent for the Notes.

SECTION 2.05.     HOLDER LISTS.

                  The Trustee shall preserve in as current a form as is
reasonably practicable the most recent list available to it of the names and
addresses of all Holders and shall otherwise comply with TIA Section 312(a). If
the Trustee is not the Registrar, the Company shall furnish to the Trustee at
least seven Business Days before each interest payment date and at such other
times as the Trustee may request in writing, a list in such form and as of such
date as the Trustee may reasonably require of the names and addresses of the
Holders of Notes and the Company shall otherwise comply with TIA Section 312(a).

SECTION 2.06.     TRANSFER AND EXCHANGE.

                  (a)      Transfer and Exchange of Global Notes.

                  A Global Note may not be transferred as a whole except by
the Depositary to a nominee of the Depositary, by a nominee of the Depositary to
the Depositary or to another nominee of the Depositary, or by the Depositary or
any such nominee to a successor Depositary or a nominee of such successor
Depositary. All Global Notes will be exchanged by the Company for Definitive
Notes if (i) the Company delivers to the Trustee notice from the Depositary that
it is unwilling or unable to continue to act as Depositary or that it is no
longer a clearing agency registered under the Exchange Act and, in either case,
a successor Depositary is not appointed by the Company within 120 days after the
date of such notice from the Depositary or (ii) the Company in its sole
discretion determines that the Global Notes (in whole but not in part) should be
exchanged for Definitive Notes and delivers a written notice to such effect to
the Trustee; provided that in no event shall the Regulation S Temporary Global
Note be exchanged by the Company for Definitive Notes prior to (x) the
expiration of the Distribution Compliance Period and (y) the receipt by the
Registrar of any certificates required pursuant to Rule 903(c)(3)(ii)(B) under
the Securities Act. Upon the occurrence of either of the preceding events in (i)
or (ii) above, Definitive Notes shall be issued in such names as the Depositary
shall instruct the Trustee. Global Notes also may be exchanged or replaced, in
whole or in part, as provided in Sections 2.07 and 2.10 hereof. Every Note
authenticated and delivered in exchange for, or in lieu of, a Global Note or any
portion thereof, pursuant to this Section 2.06 or Section 2.07 or 2.10 hereof,
shall be authenticated and delivered in the form of, and shall be, a Global
Note. A Global Note may not be exchanged for another Note other than as provided
in this Section 2.06(a), however, beneficial interests in a Global Note may be


                                       26
<PAGE>   27
transferred and exchanged as provided in Section 2.06(b),(c) or (f) hereof.

                  (b)      Transfer and Exchange of Beneficial Interests in the 
Global Notes.

                    The transfer and exchange of beneficial interests in the
Global Notes shall be effected through the Depositary, in accordance with the
provisions of this Indenture and the Applicable Procedures. Beneficial interests
in the Restricted Global Notes shall be subject to restrictions on transfer
comparable to those set forth herein to the extent required by the Securities
Act. Transfers of beneficial interests in the Global Notes also shall require
compliance with either subparagraph (i) or (ii) below, as applicable, as well as
one or more of the other following subparagraphs, as applicable:

                  (i) Transfer of Beneficial Interests in the Same Global Note.
         Beneficial interests in any Restricted Global Note may be transferred
         to Persons who take delivery thereof in the form of a beneficial
         interest in the same Restricted Global Note in accordance with the
         transfer restrictions set forth in the Private Placement Legend;
         provided, however, that prior to the expiration of the Distribution
         Compliance Period, transfers of beneficial interests in the Temporary
         Regulation S Global Note may not be made to a U.S. Person or for the
         account or benefit of a U.S. Person (other than an Initial Purchaser).
         Beneficial interests in any Unrestricted Global Note may be transferred
         to Persons who take delivery thereof in the form of a beneficial
         interest in an Unrestricted Global Note. No written orders or
         instructions shall be required to be delivered to the Registrar to
         effect the transfers described in this Section 2.06(b)(i).

                  (ii) All Other Transfers and Exchanges of Beneficial Interests
         in Global Notes. In connection with all transfers and exchanges of
         beneficial interests that are not subject to Section 2.06(b)(i) above,
         the transferor of such beneficial interest must deliver to the
         Registrar either (A) (1) a written order from a Participant or an
         Indirect Participant given to the Depositary in accordance with the
         Applicable Procedures directing the Depositary to credit or cause to be
         credited a beneficial interest in another Global Note in an amount
         equal to the beneficial interest to be transferred or exchanged and (2)
         instructions given in accordance with the Applicable Procedures
         containing information regarding the Participant account to be credited
         with such increase or (B) (1) a written order from a Participant or an
         Indirect Participant given to the Depositary in accordance with the
         Applicable Procedures directing the Depositary to cause to be issued a
         Definitive Note in an amount equal to the beneficial interest to be
         transferred or exchanged and (2) instructions given by the Depositary
         to the Registrar containing information regarding the Person in whose
         name such Definitive Note shall be registered to effect the transfer or
         exchange referred to in (1) above; provided that in no event shall
         Definitive Notes be issued upon the transfer or exchange of beneficial
         interests in the Regulation S Temporary Global Note prior to (x) the
         expiration of the Distribution Compliance Period and (y) the receipt by
         the Registrar of any certificates required pursuant to Rule 903 under
         the Securities Act. Upon consummation of an Exchange Offer by the
         Company in accordance with Section 2.06(f) hereof, the requirements of
         this Section 2.06(b)(ii) shall be deemed to have been satisfied upon
         receipt by the Registrar of the instructions contained in the Letter of
         Transmittal delivered by the Holder of such beneficial interests in the
         Restricted Global Notes. Upon satisfaction of all of the requirements
         for transfer or exchange of beneficial interests in Global Notes
         contained in this Indenture and the Notes or otherwise applicable under
         the Securities Act, the Trustee shall adjust the principal amount of
         the relevant Global Note(s) pursuant to Section 2.06(h) hereof.

                  (iii) Transfer of Beneficial Interests to Another Restricted
         Global Note. A beneficial interest in any Restricted Global Note may be
         transferred to a Person who takes delivery thereof 


                                       27
<PAGE>   28
         in the form of a beneficial interest in another Restricted Global Note
         if the transfer complies with the requirements of Section 2.06(b)(ii)
         above and the Registrar receives the following:

                  (A) if the transferee will take delivery in the form of a
              beneficial interest in the 144A Global Note, then the transferor
              must deliver a certificate in the form of Exhibit B hereto,
              including the certifications in item (1) thereof;

                  (B) if the transferee will take delivery in the form of a
              beneficial interest in the Regulation S Temporary Global Note or
              the Regulation S Global Note, then the transferor must deliver a
              certificate in the form of Exhibit B hereto, including the
              certifications in item (2) thereof; and

                  (iv) Transfer and Exchange of Beneficial Interests in a
         Restricted Global Note for Beneficial Interests in the Unrestricted
         Global Note. A beneficial interest in any Restricted Global Note may be
         exchanged by any holder thereof for a beneficial interest in an
         Unrestricted Global Note or transferred to a Person who takes delivery
         thereof in the form of a beneficial interest in an Unrestricted Global
         Note if the exchange or transfer complies with the requirements of
         Section 2.06(b)(ii) above and:

                  (A) such exchange or transfer is effected pursuant to the
              Exchange Offer in accordance with the Registration Rights
              Agreement and the holder of the beneficial interest to be
              transferred, in the case of an exchange, or the transferee, in the
              case of a transfer, certifies in the applicable Letter of
              Transmittal that it is not (1) a broker-dealer, (2) a Person
              participating in the distribution of the Exchange Notes or (3) a
              Person who is an affiliate (as defined in Rule 144) of the
              Company;

                  (B) such transfer is effected pursuant to the Shelf
              Registration Statement in accordance with the Registration Rights
              Agreement;

                  (C) such transfer is effected by a Participating Broker-Dealer
              pursuant to the Exchange Offer Registration Statement in
              accordance with the Registration Rights Agreement; or

                  (D) the Registrar receives the following:

                           (1) if the holder of such beneficial interest in a
                  Restricted Global Note proposes to exchange such beneficial
                  interest for a beneficial interest in an Unrestricted Global
                  Note, a certificate from such holder in the form of Exhibit C
                  hereto, including the certifications in item (1)(a) thereof;
                  or

                           (2) if the holder of such beneficial interest in a
                  Restricted Global Note proposes to transfer such beneficial
                  interest to a Person who shall take delivery thereof in the
                  form of a beneficial interest in an Unrestricted Global Note,
                  a certificate from such holder in the form of Exhibit B
                  hereto, including the certifications in item (4) thereof;

              and, in each such case set forth in this subparagraph (D), if the
              Registrar so requests or if the Applicable Procedures so require,
              an Opinion of Counsel in form reasonably acceptable to the
              Registrar to the effect that such exchange or transfer is in
              compliance with the Securities Act and that the restrictions on
              transfer contained herein and in the Private Placement Legend are
              no longer required in order to maintain compliance with the
              Securities Act.


                                       28
<PAGE>   29
                  If any such transfer is effected pursuant to subparagraph (B)
or (D) above at a time when an Unrestricted Global Note has not yet been issued,
the Company shall issue and, upon receipt of an Authentication Order in
accordance with Section 2.02 hereof, the Trustee shall authenticate one or more
Unrestricted Global Notes in an aggregate principal amount equal to the
aggregate principal amount of beneficial interests transferred pursuant to
subparagraph (B) or (D) above.

                  Beneficial interests in an Unrestricted Global Note cannot be
exchanged for, or transferred to Persons who take delivery thereof in the form
of, a beneficial interest in a Restricted Global Note.

                  (c)      Transfer or Exchange of Beneficial Interests for 
Definitive Notes.

                  (i) Beneficial Interests in Restricted Global Notes to
         Restricted Definitive Notes. If any holder of a beneficial interest in
         a Restricted Global Note proposes to exchange such beneficial interest
         for a Restricted Definitive Note or to transfer such beneficial
         interest to a Person who takes delivery thereof in the form of a
         Restricted Definitive Note, then, upon receipt by the Registrar of the
         following documentation:

                           (A) if the holder of such beneficial interest in a
                  Restricted Global Note proposes to exchange such beneficial
                  interest for a Restricted Definitive Note, a certificate from
                  such holder in the form of Exhibit C hereto, including the
                  certifications in item (2)(a) thereof;

                           (B) if such beneficial interest is being transferred
                  to a QIB in accordance with Rule 144A under the Securities
                  Act, a certificate to the effect set forth in Exhibit B
                  hereto, including the certifications in item (1) thereof;

                           (C) if such beneficial interest is being transferred
                  to a Non-U.S. Person in an offshore transaction in accordance
                  with Rule 903 or Rule 904 under the Securities Act, a
                  certificate to the effect set forth in Exhibit B hereto,
                  including the certifications in item (2) thereof;

                           (D) if such beneficial interest is being transferred
                  pursuant to an exemption from the registration requirements of
                  the Securities Act in accordance with Rule 144 under the
                  Securities Act, a certificate to the effect set forth in
                  Exhibit B hereto, including the certifications in item (3)(a)
                  thereof;

                           (E) if such beneficial interest is being transferred
                  to an Institutional Accredited Investor in reliance on an
                  exemption from the registration requirements of the Securities
                  Act other than those listed in subparagraphs (B) through (D)
                  above, a certificate to the effect set forth in Exhibit B
                  hereto, including the certifications, certificates and Opinion
                  of Counsel required by Item (3) thereof, if applicable, and a
                  certificate from the transferee to the effect set forth in
                  Exhibit D hereto;

                           (F) if such beneficial interest is being transferred
                  to the Company or any of its Subsidiaries, a certificate to
                  the effect set forth in Exhibit B hereto, including the
                  certifications in item (3)(b) thereof; or

                           (G) if such beneficial interest is being transferred
                  pursuant to an effective registration statement under the
                  Securities Act, a certificate to the effect set forth in


                                       29
<PAGE>   30
                  Exhibit B hereto, including the certifications in item (3)(c)
                  thereof,

         the Trustee shall cause the aggregate principal amount of the
         applicable Global Note to be reduced accordingly pursuant to Section
         2.06(h) hereof, and the Company shall execute and the Trustee shall
         authenticate and deliver to the Person designated in the instructions a
         Definitive Note in the appropriate principal amount. Any Definitive
         Note issued in exchange for a beneficial interest in a Restricted
         Global Note pursuant to this Section 2.06(c) shall be registered in
         such name or names and in such authorized denomination or denominations
         as the holder of such beneficial interest shall instruct the Registrar
         through instructions from the Depositary and the Participant or
         Indirect Participant. The Trustee shall deliver such Definitive Notes
         to the Persons in whose names such Notes are so registered. Any
         Definitive Note issued in exchange for a beneficial interest in a
         Restricted Global Note pursuant to this Section 2.06(c)(i) shall bear
         the Private Placement Legend and shall be subject to all restrictions
         on transfer contained therein.

                  (ii) Notwithstanding Sections 2.06(c)(i)(A) and (C) hereof, a
         beneficial interest in the Regulation S Temporary Global Note may not
         be exchanged for a Definitive Note or transferred to a Person who takes
         delivery thereof in the form of a Definitive Note prior to (x) the
         expiration of the Distribution Compliance Period and (y) the receipt by
         the Registrar of any certificates required pursuant to Rule
         903(b)(3)(ii)(B) under the Securities Act, except in the case of a
         transfer pursuant to an exemption from the registration requirements of
         the Securities Act other than Rule 903 or Rule 904.

                  (iii) Beneficial Interests in Restricted Global Notes to
         Unrestricted Definitive Notes. A holder of a beneficial interest in a
         Restricted Global Note may exchange such beneficial interest for an
         Unrestricted Definitive Note or may transfer such beneficial interest
         to a Person who takes delivery thereof in the form of an Unrestricted
         Definitive Note only if:

                           (A) such exchange or transfer is effected pursuant to
                  the Exchange Offer in accordance with the Registration Rights
                  Agreement and the holder of such beneficial interest, in the
                  case of an exchange, or the transferee, in the case of a
                  transfer, certifies in the applicable Letter of Transmittal
                  that it is not (1) a broker-dealer, (2) a Person participating
                  in the distribution of the Exchange Notes or (3) a Person who
                  is an affiliate (as defined in Rule 144) of the Company;

                           (B) such transfer is effected pursuant to the Shelf
                  Registration Statement in accordance with the Registration
                  Rights Agreement;

                           (C) such transfer is effected by a Participating
                  Broker-Dealer pursuant to the Exchange Offer Registration
                  Statement in accordance with the Registration Rights
                  Agreement; or

                           (D) the Registrar receives the following:

                                    (1) if the holder of such beneficial
                           interest in a Restricted Global Note proposes to
                           exchange such beneficial interest for a Definitive
                           Note that does not bear the Private Placement Legend,
                           a certificate from such holder in the form of Exhibit
                           C hereto, including the certifications in item (1)(b)
                           thereof; or


                                       30
<PAGE>   31
                                    (2) if the holder of such beneficial
                           interest in a Restricted Global Note proposes to
                           transfer such beneficial interest to a Person who
                           shall take delivery thereof in the form of a
                           Definitive Note that does not bear the Private
                           Placement Legend, a certificate from such holder in
                           the form of Exhibit B hereto, including the
                           certifications in item (4) thereof;

                  and, in each such case set forth in this subparagraph (D), if
                  the Registrar so requests or if the Applicable Procedures so
                  require, an Opinion of Counsel in form reasonably acceptable
                  to the Registrar to the effect that such exchange or transfer
                  is in compliance with the Securities Act and that the
                  restrictions on transfer contained herein and in the Private
                  Placement Legend are no longer required in order to maintain
                  compliance with the Securities Act.

                  (iv) Beneficial Interests in Unrestricted Global Notes to
         Unrestricted Definitive Notes. If any holder of a beneficial interest
         in an Unrestricted Global Note proposes to exchange such beneficial
         interest for a Definitive Note or to transfer such beneficial interest
         to a Person who takes delivery thereof in the form of a Definitive
         Note, then, upon satisfaction of the conditions set forth in Section
         2.06(b)(ii) hereof, the Trustee shall cause the aggregate principal
         amount of the applicable Global Note to be reduced accordingly pursuant
         to Section 2.06(h) hereof, and the Company shall execute and the
         Trustee shall authenticate and deliver to the Person designated in the
         instructions a Definitive Note in the appropriate principal amount. Any
         Definitive Note issued in exchange for a beneficial interest pursuant
         to this Section 2.06(c)(iii) shall be registered in such name or names
         and in such authorized denomination or denominations as the holder of
         such beneficial interest shall instruct the Registrar through
         instructions from the Depositary and the Participant or Indirect
         Participant. The Trustee shall deliver such Definitive Notes to the
         Persons in whose names such Notes are so registered. Any Definitive
         Note issued in exchange for a beneficial interest pursuant to this
         Section 2.06(c)(iii) shall not bear the Private Placement Legend.

                  (d)      Transfer and Exchange of Definitive Notes for 
Beneficial Interests.

                  (i) Restricted Definitive Notes to Beneficial Interests in
         Restricted Global Notes. If any Holder of a Restricted Definitive Note
         proposes to exchange such Note for a beneficial interest in a
         Restricted Global Note or to transfer such Restricted Definitive Notes
         to a Person who takes delivery thereof in the form of a beneficial
         interest in a Restricted Global Note, then, upon receipt by the
         Registrar of the following documentation:

                           (A) if the Holder of such Restricted Definitive Note
                  proposes to exchange such Note for a beneficial interest in a
                  Restricted Global Note, a certificate from such Holder in the
                  form of Exhibit C hereto, including the certifications in item
                  (2)(b) thereof;

                           (B) if such Restricted Definitive Note is being
                  transferred to a QIB in accordance with Rule 144A under the
                  Securities Act, a certificate to the effect set forth in
                  Exhibit B hereto, including the certifications in item (1)
                  thereof;

                           (C) if such Restricted Definitive Note is being
                  transferred to a Non-U.S. Person in an offshore transaction in
                  accordance with Rule 903 or Rule 904 under the Securities Act,
                  a certificate to the effect set forth in Exhibit B hereto,
                  including the certifications in item (2) thereof;


                                       31
<PAGE>   32
                           (D) if such Restricted Definitive Note is being
                  transferred pursuant to an exemption from the registration
                  requirements of the Securities Act in accordance with Rule 144
                  under the Securities Act, a certificate to the effect set
                  forth in Exhibit B hereto, including the certifications in
                  item (3)(a) thereof;

                           (E) if such Restricted Definitive Note is being
                  transferred to the Company or any of its Subsidiaries, a
                  certificate to the effect set forth in Exhibit B hereto,
                  including the certifications in item (3)(b) thereof; or

                           (F) if such Restricted Definitive Note is being
                  transferred pursuant to an effective registration statement
                  under the Securities Act, a certificate to the effect set
                  forth in Exhibit B hereto, including the certifications in
                  item (3)(c) thereof,

         the Trustee shall cancel the Restricted Definitive Note, increase or
         cause to be increased the aggregate principal amount of, in the case of
         clause (A) above, the appropriate Restricted Global Note, in the case
         of clause (B) above, the 144A Global Note, in the case of clause (C)
         above, the Regulation S Global Note, and in all other cases, the 144A
         Global Note.

                  (ii) Restricted Definitive Notes to Beneficial Interests in
         Unrestricted Global Notes. A Holder of a Restricted Definitive Note may
         exchange such Note for a beneficial interest in an Unrestricted Global
         Note or transfer such Restricted Definitive Note to a Person who takes
         delivery thereof in the form of a beneficial interest in an
         Unrestricted Global Note only if:

                           (A) such exchange or transfer is effected pursuant to
                  the Exchange Offer in accordance with the Registration Rights
                  Agreement and the Holder, in the case of an exchange, or the
                  transferee, in the case of a transfer, certifies in the
                  applicable Letter of Transmittal that it is not (1) a
                  broker-dealer, (2) a Person participating in the distribution
                  of the Exchange Notes or (3) a Person who is an affiliate (as
                  defined in Rule 144) of the Company;

                           (B) such transfer is effected pursuant to the Shelf
                  Registration Statement in accordance with the Registration
                  Rights Agreement;

                           (C) such transfer is effected by a Participating
                  Broker-Dealer pursuant to the Exchange Offer Registration
                  Statement in accordance with the Registration Rights
                  Agreement; or

                           (D) the Registrar receives the following:

                                    (1) if the Holder of such Definitive Notes
                           proposes to exchange such Notes for a beneficial
                           interest in the Unrestricted Global Note, a
                           certificate from such Holder in the form of Exhibit C
                           hereto, including the certifications in item (1)(c)
                           thereof; or

                                    (2) if the Holder of such Definitive Notes
                           proposes to transfer such Notes to a Person who shall
                           take delivery thereof in the form of a beneficial
                           interest in the Unrestricted Global Note, a
                           certificate from such Holder in the form of Exhibit B
                           hereto, including the certifications in item (4)
                           thereof;

                  and, in each such case set forth in this subparagraph (D), if
                  the Registrar so requests or if 


                                       32
<PAGE>   33
                  the Applicable Procedures so require, an Opinion of Counsel in
                  form reasonably acceptable to the Registrar to the effect that
                  such exchange or transfer is in compliance with the Securities
                  Act and that the restrictions on transfer contained herein and
                  in the Private Placement Legend are no longer required in
                  order to maintain compliance with the Securities Act.

                  Upon satisfaction of the conditions of any of the
         subparagraphs in this Section 2.06(d)(ii), the Trustee shall cancel the
         Definitive Notes and increase or cause to be increased the aggregate
         principal amount of the Unrestricted Global Note.

                  (iii) Unrestricted Definitive Notes to Beneficial Interests in
         Unrestricted Global Notes. A Holder of an Unrestricted Definitive Note
         may exchange such Note for a beneficial interest in an Unrestricted
         Global Note or transfer such Definitive Notes to a Person who takes
         delivery thereof in the form of a beneficial interest in an
         Unrestricted Global Note at any time. Upon receipt of a request for
         such an exchange or transfer, the Trustee shall cancel the applicable
         Unrestricted Definitive Note and increase or cause to be increased the
         aggregate principal amount of one of the Unrestricted Global Notes.

                  If any such exchange or transfer from a Definitive Note to a
beneficial interest is effected pursuant to subparagraphs (ii)(B), (ii)(D) or
(iii) above at a time when an Unrestricted Global Note has not yet been issued,
the Company shall issue and, upon receipt of an Authentication Order in
accordance with Section 2.02 hereof, the Trustee shall authenticate one or more
Unrestricted Global Notes in an aggregate principal amount equal to the
principal amount of Definitive Notes so transferred.

                  (e)      Transfer and Exchange of Definitive Notes for 
Definitive Notes.

                    Upon request by a Holder of Definitive Notes and such
Holder's compliance with the provisions of this Section 2.06(e), the Registrar
shall register the transfer or exchange of Definitive Notes. Prior to such
registration of transfer or exchange, the requesting Holder shall present or
surrender to the Registrar the Definitive Notes duly endorsed or accompanied by
a written instruction of transfer in form satisfactory to the Registrar duly
executed by such Holder or by his attorney, duly authorized in writing. In
addition, the requesting Holder shall provide any additional certifications,
documents and information, as applicable, required pursuant to the following
provisions of this Section 2.06(e).

                  (i) Restricted Definitive Notes to Restricted Definitive
         Notes. Any Restricted Definitive Note may be transferred to and
         registered in the name of Persons who take delivery thereof in the form
         of a Restricted Definitive Note if the Registrar receives the
         following:

                           (A) if the transfer will be made pursuant to Rule
                  144A under the Securities Act, then the transferor must
                  deliver a certificate in the form of Exhibit B hereto,
                  including the certifications in item (1) thereof;

                           (B) if the transfer will be made pursuant to Rule 903
                  or Rule 904, then the transferor must deliver a certificate in
                  the form of Exhibit B hereto, including the certifications in
                  item (2) thereof;

                           (C) if the transfer will be made pursuant to any
                  other exemption from the registration requirements of the
                  Securities Act, then the transferor must deliver a certificate
                  in the form of Exhibit B hereto, including the certifications,
                  certificates and 


                                       33
<PAGE>   34
                  Opinion of Counsel required by item (3) thereof, if
                  applicable; and

                           (D) if the transfer will be made to an Institutional
                  Accredited Investor pursuant to an exemption from the
                  registration requirements of the Securities Act other than
                  those listed in subparagraphs (A) and (B) above, then the
                  transferor must deliver a certificate in the form of Exhibit B
                  hereto, including the certifications, certificates and Opinion
                  of Counsel required by Item (3) thereof, if applicable, and
                  the transferee must deliver a certificate in the form of
                  Exhibit D hereto.

                  (ii) Restricted Definitive Notes to Unrestricted Definitive
         Notes. Any Restricted Definitive Note may be exchanged by the Holder
         thereof for an Unrestricted Definitive Note or transferred to a Person
         or Persons who take delivery thereof in the form of an Unrestricted
         Definitive Note if:

                           (A) such exchange or transfer is effected pursuant to
                  the Exchange Offer in accordance with the Registration Rights
                  Agreement and the Holder, in the case of an exchange, or the
                  transferee, in the case of a transfer, certifies in the
                  applicable Letter of Transmittal that it is not (1) a
                  broker-dealer, (2) a Person participating in the distribution
                  of the Exchange Notes or (3) a Person who is an affiliate (as
                  defined in Rule 144) of the Company;

                           (B) any such transfer is effected pursuant to the
                  Shelf Registration Statement in accordance with the
                  Registration Rights Agreement;

                           (C) any such transfer is effected by a Participating
                  Broker-Dealer pursuant to the Exchange Offer Registration
                  Statement in accordance with the Registration Rights
                  Agreement; or

                           (D) the Registrar receives the following:

                                    (1) if the Holder of such Restricted
                           Definitive Notes proposes to exchange such Notes for
                           an Unrestricted Definitive Note, a certificate from
                           such Holder in the form of Exhibit C hereto,
                           including the certifications in item (1)(d) thereof;
                           or

                                    (2) if the Holder of such Restricted
                           Definitive Notes proposes to transfer such Notes to a
                           Person who shall take delivery thereof in the form of
                           an Unrestricted Definitive Note, a certificate from
                           such Holder in the form of Exhibit B hereto,
                           including the certifications in item (4) thereof;

                  and, in each such case set forth in this subparagraph (D), if
                  the Registrar so requests, an Opinion of Counsel in form
                  reasonably acceptable to the Company to the effect that such
                  exchange or transfer is in compliance with the Securities Act
                  and that the restrictions on transfer contained herein and in
                  the Private Placement Legend are no longer required in order
                  to maintain compliance with the Securities Act.

                  (iii) Unrestricted Definitive Notes to Unrestricted Definitive
         Notes. A Holder of Unrestricted Definitive Notes may transfer such
         Notes to a Person who takes delivery thereof in the form of an
         Unrestricted Definitive Note. Upon receipt of a request to register
         such a transfer, the Registrar shall register the Unrestricted
         Definitive Notes pursuant to the instructions from the 


                                       34
<PAGE>   35
         Holder thereof.

                  (f)      Exchange Offer.

                    Upon the occurrence of the Exchange Offer in accordance with
the Registration Rights Agreement, the Company shall issue and, upon receipt of
an Authentication Order in accordance with Section 2.02 hereof, the Trustee
shall authenticate (i) one or more Unrestricted Global Notes in an aggregate
principal amount equal to the principal amount of the beneficial interests in
the Restricted Global Notes tendered for acceptance by Persons that certify in
the applicable Letters of Transmittal that (x) they are not broker-dealers, (y)
they are not participating in a distribution of the Exchange Notes and (z) they
are not affiliates (as defined in Rule 144) of the Company, and accepted for
exchange in the Exchange Offer and (ii) Definitive Notes in an aggregate
principal amount equal to the principal amount of the Restricted Definitive
Notes accepted for exchange in the Exchange Offer. Concurrently with the
issuance of such Notes, the Trustee shall cause the aggregate principal amount
of the applicable Restricted Global Notes to be reduced accordingly, and the
Company shall execute and the Trustee shall authenticate and deliver to the
Persons designated by the Holders of Definitive Notes so accepted Definitive
Notes in the appropriate principal amount.

                  (g)      Legends.

                    The following legends shall appear on the face of all Global
Notes and Definitive Notes issued under this Indenture unless specifically
stated otherwise in the applicable provisions of this Indenture.

                  (i)      Private Placement Legend.

                           (A) Except as permitted by subparagraph (B) below,
                  each Global Note and each Definitive Note (and all Notes
                  issued in exchange therefor or substitution thereof) shall
                  bear the legend in substantially the following form.

                  "THE SECURITIES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED
                  UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
                  ACT"), OR ANY STATE OR OTHER SECURITIES LAWS. NEITHER THIS
                  SECURITY NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE
                  REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR
                  OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR
                  UNLESS THE TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, THE
                  REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. THE HOLDER OF
                  THIS SECURITY BY ITS ACCEPTANCE HEREOF (1) REPRESENTS THAT (A)
                  IT IS A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE
                  144A UNDER THE SECURITIES ACT) OR (B) IT IS NOT A U.S. PERSON
                  AND IS ACQUIRING ITS NOTE IN AN "OFFSHORE TRANSACTION"
                  PURSUANT TO REGULATION S UNDER THE SECURITIES ACT, (2) AGREES
                  THAT IT WILL NOT PRIOR TO (X) THE DATE WHICH IS TWO YEARS (OR
                  SUCH SHORTER PERIOD OF TIME AS PERMITTED BY RULE 144(k) UNDER
                  THE SECURITIES ACT OR ANY SUCCESSOR PROVISION THEREUNDER)
                  AFTER THE LATER OF THE ORIGINAL ISSUE DATE HEREOF (OR OF ANY
                  PREDECESSOR OF THIS SECURITY ) OR THE LAST DAY ON WHICH THE
                  COMPANY OR ANY AFFILIATE OF THE COMPANY WAS THE OWNER OF THIS
                  SECURITY (OR ANY PREDECESSOR 


                                       35
<PAGE>   36
                  OF THIS SECURITY) AND (Y) SUCH LATER DATE, IF ANY, AS MAY BE
                  REQUIRED BY APPLICABLE LAWS (THE "RESALE RESTRICTION
                  TERMINATION DATE"), OFFER, SELL OR OTHERWISE TRANSFER THIS
                  SECURITY EXCEPT (A) TO THE COMPANY, (B) PURSUANT TO A
                  REGISTRATION STATEMENT WHICH HAS BEEN DECLARED EFFECTIVE UNDER
                  THE SECURITIES ACT, (C) FOR SO LONG AS THE SECURITIES ARE
                  ELIGIBLE FOR RESALE PURSUANT TO RULE 144A, TO A PERSON IT
                  REASONABLY BELIEVES IS A "QUALIFIED INSTITUTIONAL BUYER" AS
                  DEFINED IN RULE 144A UNDER THE SECURITIES ACT THAT PURCHASES
                  FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED
                  INSTITUTIONAL BUYER TO WHOM NOTICE IS GIVEN THAT THE TRANSFER
                  IS BEING MADE IN RELIANCE ON RULE 144A, (D) PURSUANT TO OFFERS
                  AND SALES TO NON-U.S. PERSONS THAT OCCUR OUTSIDE THE UNITED
                  STATES WITHIN THE MEANING OF REGULATION S UNDER THE SECURITIES
                  ACT OR (E) PURSUANT TO ANOTHER AVAILABLE EXEMPTION FROM THE
                  REGISTRATION REQUIREMENTS OF THE SECURITIES ACT, (3) IF THIS
                  SECURITY WAS ACQUIRED IN AN OFFSHORE TRANSACTION PURSUANT TO
                  REGULATION S, AGREES THAT HEDGING TRANSACTIONS INVOLVING THIS
                  SECURITY MAY NOT BE CONDUCTED UNLESS IN COMPLIANCE WITH THE
                  SECURITIES ACT AND (4) AGREES THAT IT WILL GIVE TO EACH PERSON
                  TO WHOM THIS SECURITY IS TRANSFERRED A NOTICE SUBSTANTIALLY TO
                  THE EFFECT OF THIS LEGEND; PROVIDED THAT THE COMPANY, THE
                  TRUSTEE AND THE REGISTRAR SHALL HAVE THE RIGHT PRIOR TO ANY
                  SUCH OFFER, SALE OR TRANSFER, IN EACH OF THE FOREGOING CASES,
                  TO REQUIRE THAT A CERTIFICATION OF TRANSFER IN THE FORM
                  PROVIDED IN THE INDENTURE IS COMPLETED AND DELIVERED BY THE
                  TRANSFEROR TO THE TRUSTEE IN CONNECTION WITH ANY TRANSFER OF
                  THIS SECURITY WITHIN THE TIME PERIOD REFERRED TO ABOVE. THE
                  HOLDER MUST CHECK THE APPROPRIATE BOX SET FORTH ON THE
                  TRANSFER CERTIFICATE RELATING TO THE MANNER OF SUCH TRANSFER
                  AND SUBMIT THE CERTIFICATE TO THE TRUSTEE. THIS LEGEND WILL BE
                  REMOVED UPON THE REQUEST OF THE HOLDER AFTER THE RESALE
                  RESTRICTION TERMINATION DATE. AS USED HEREIN, THE TERMS
                  "OFFSHORE TRANSACTION," "UNITED STATES" AND "U.S. PERSON" HAVE
                  THE MEANINGS GIVEN TO THEM BY REGULATION S UNDER THE
                  SECURITIES ACT."

                           (B) Notwithstanding the foregoing, any Global Note or
                  Definitive Note issued pursuant to subparagraphs (b)(iv),
                  (c)(ii), (c)(iii), (d)(ii), (d)(iii), (e)(ii), (e)(iii) or (f)
                  to this Section 2.06 (and all Notes issued in exchange
                  therefor or substitution thereof) shall not bear the Private
                  Placement Legend.

                  (ii) Global Note Legend. Each Global Note shall bear a legend
         in substantially the following form:


                                       36
<PAGE>   37
                  "UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED
                  REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY TO THE COMPANY
                  OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR
                  PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME
                  OF CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN
                  AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY OR
                  SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED
                  REPRESENTATIVE OF THE DEPOSITARY TRUST COMPANY (AND ANY
                  PAYMENT HEREON IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY
                  AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE
                  DEPOSITARY TRUST COMPANY), ANY TRANSFER, PLEDGE OR OTHER USE
                  HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL
                  SINCE THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
                  HEREIN.

                  TRANSFERS OF THIS GLOBAL NOTE SHALL BE LIMITED TO TRANSFERS IN
                  WHOLE, BUT NOT IN PART, TO NOMINEES OF CEDE & CO. OR TO A
                  SUCCESSOR THEREOF OR SUCH SUCCESSOR'S NOMINEE AND TRANSFERS OF
                  PORTIONS OF THIS GLOBAL NOTE SHALL BE LIMITED TO TRANSFERS
                  MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN SECTION
                  2.06 OF THE INDENTURE."

                   (iii) Regulation S Temporary Global Note Legend. The
         Regulation S Temporary Global Note shall bear a legend in substantially
         the following form:

                  "THE RIGHTS ATTACHING TO THIS REGULATION S TEMPORARY GLOBAL
                  NOTE, AND THE CONDITIONS AND PROCEDURES GOVERNING ITS EXCHANGE
                  FOR PERMANENT OR CERTIFICATED NOTES, ARE AS SPECIFIED IN THIS
                  INDENTURE (AS DEFINED HEREIN). NEITHER THE HOLDER NOR THE
                  BENEFICIAL OWNERS OF THIS REGULATION S TEMPORARY GLOBAL NOTE
                  SHALL BE ENTITLED TO RECEIVE PAYMENT OF INTEREST HEREON."

                  (iv) Separability Legend. Until the Separation Date, each Note
         shall bear the following legend (the "Separability Legend"):

                  "UNTIL THE SEPARATION DATE (AS DEFINED), THIS NOTE HAS BEEN
                  ISSUED AS, AND MUST BE TRANSFERRED AS, A UNIT TOGETHER WITH
                  THE ASSOCIATED WARRANTS TO PURCHASE COMMON STOCK OF THE
                  COMPANY. EACH UNIT CONSISTS OF $1,000 PRINCIPAL AMOUNT OF
                  NOTES AND A WARRANT TO PURCHASE 12.25856 SHARES OF COMMON
                  STOCK OF THE COMPANY, SUBJECT TO ADJUSTMENT UNDER CERTAIN
                  CIRCUMSTANCES. A COPY OF THE WARRANT AGREEMENT PURSUANT TO
                  WHICH THE WARRANTS HAVE BEEN ISSUED IS AVAILABLE FROM THE
                  COMPANY UPON REQUEST."

                  (h) Cancellation and/or Adjustment of Global Notes.

                  At such time as all beneficial interests in a particular
Global Note have been exchanged for Definitive Notes or a particular Global Note
has been redeemed, repurchased or canceled in whole 


                                       37
<PAGE>   38
and not in part, each such Global Note shall be returned to or retained and
canceled by the Trustee in accordance with Section 2.11 hereof. At any time
prior to such cancellation, if any beneficial interest in a Global Note is
exchanged for or transferred to a Person who will take delivery thereof in the
form of a beneficial interest in another Global Note or for Definitive Notes,
the principal amount of Notes represented by such Global Note shall be reduced
accordingly and an endorsement shall be made on such Global Note by the Trustee
or by the Depositary at the direction of the Trustee to reflect such reduction;
and if the beneficial interest is being exchanged for or transferred to a Person
who will take delivery thereof in the form of a beneficial interest in another
Global Note, such other Global Note shall be increased accordingly and an
endorsement shall be made on such Global Note by the Trustee or by the
Depositary at the direction of the Trustee to reflect such increase.

                  (i)      General Provisions Relating to Transfers and 
Exchanges.

                  (i) To permit registrations of transfers and exchanges, the
         Company shall execute and the Trustee shall authenticate Global Notes
         and Definitive Notes upon the Company's order or at the Registrar's
         request.

                  (ii) No service charge shall be made to a holder of a
         beneficial interest in a Global Note or to a Holder of a Definitive
         Note for any registration of transfer or exchange, but the Company may
         require payment of a sum sufficient to cover any transfer tax or
         similar governmental charge payable in connection therewith (other than
         any such transfer taxes or similar governmental charge payable upon
         exchange or transfer pursuant to Sections 2.10, 3.06, 3.09, 4.10, 4.15
         and 9.05 hereof).

                  (iii) The Registrar shall not be required to register the
         transfer of or exchange any Note selected for redemption in whole or in
         part, except the unredeemed portion of any Note being redeemed in part.

                  (iv) All Global Notes and Definitive Notes issued upon any
         registration of transfer or exchange of Global Notes or Definitive
         Notes shall be the valid obligations of the Company, evidencing the
         same debt, and entitled to the same benefits under this Indenture, as
         the Global Notes or Definitive Notes surrendered upon such registration
         of transfer or exchange.

                  (v) The Company shall not be required (A) to issue, to
         register the transfer of or to exchange any Notes during a period
         beginning at the opening of business 15 days before the day of any
         selection of Notes for redemption under Section 3.02 hereof and ending
         at the close of business on the day of selection, (B) to register the
         transfer of or to exchange any Note so selected for redemption in whole
         or in part, except the unredeemed portion of any Note being redeemed in
         part or (c) to register the transfer of or to exchange a Note between a
         record date and the next succeeding Interest Payment Date.

                  (vi) Prior to due presentment for the registration of a
         transfer of any Note, the Trustee, any Agent and the Company may deem
         and treat the Person in whose name any Note is registered as the
         absolute owner of such Note for the purpose of receiving payment of
         principal of and interest on such Notes and for all other purposes, and
         none of the Trustee, any Agent or the Company shall be affected by
         notice to the contrary.

                  (vii) The Trustee shall authenticate Global Notes and
         Definitive Notes in accordance with the provisions of Section 2.02
         hereof.


                                       38
<PAGE>   39
                  (viii) All certifications, certificates and Opinions of
         Counsel required to be submitted to the Registrar pursuant to this
         Section 2.06 to effect a registration of transfer or exchange may be
         submitted by facsimile.

SECTION 2.07.     REPLACEMENT NOTES

                  If any mutilated Note is surrendered to the Trustee or the
Company or the Trustee receives evidence to its satisfaction of the destruction,
loss or theft of any Note, the Company shall issue and the Trustee, upon receipt
of an Authentication Order, shall authenticate a replacement Note if the
Trustee's requirements are met. If required by the Trustee or the Company, an
indemnity bond must be supplied by the Holder that is sufficient in the judgment
of the Trustee and the Company to protect the Company, the Trustee, any Agent
and any authenticating agent from any loss that any of them may suffer if a Note
is replaced. The Company may charge for its expenses in replacing a Note.

                  Every replacement Note is an additional obligation of the
Company and shall be entitled to all of the benefits of this Indenture equally
and proportionately with all other Notes duly issued hereunder.

SECTION 2.08.     OUTSTANDING NOTES.

                  The Notes outstanding at any time are all the Notes
authenticated by the Trustee except for those canceled by it, those delivered to
it for cancellation, those reductions in the interest in a Global Note effected
by the Trustee in accordance with the provisions hereof, and those described in
this Section as not outstanding.

                  If a Note is replaced pursuant to Section 2.07 hereof, it
ceases to be outstanding unless the Trustee receives proof satisfactory to it
that the replaced Note is held by a bona fide purchaser.

                  If the principal amount of any Note is considered paid under
Section 4.01 hereof, it ceases to be outstanding and interest on it ceases to
accrue.

                  If the Paying Agent (other than the Company, a Subsidiary or
an Affiliate of any thereof) holds, on a redemption date or maturity date, money
sufficient to pay Notes payable on that date, then on and after that date such
Notes shall be deemed to be no longer outstanding and shall cease to accrue
interest.

SECTION 2.09.     TREASURY NOTES.

                  In determining whether the Holders of the required principal
amount of Notes have concurred in any direction, waiver or consent, Notes owned
by the Company, or by any Person directly or indirectly controlling or
controlled by or under direct or indirect common control with the Company, shall
be considered as though not outstanding, except that for the purposes of
determining whether the Trustee shall be protected in relying on any such
direction, waiver or consent, only Notes that the Trustee knows are so owned
shall be so disregarded.

SECTION 2.10.     TEMPORARY NOTES

                  Until certificates representing Notes are ready for delivery,
the Company may prepare and the Trustee, upon receipt of an Authentication
Order, shall authenticate temporary Notes. Temporary Notes shall be
substantially in the form of certificated Notes but may have variations that the


                                       39
<PAGE>   40
Company considers appropriate for temporary Notes and as shall be reasonably
acceptable to the Trustee. Without unreasonable delay, the Company shall prepare
and the Trustee shall authenticate definitive Notes in exchange for temporary
Notes.

                  Holders of temporary Notes shall be entitled to all of the
benefits of this Indenture.

SECTION 2.11.     CANCELLATION.

                  The Company at any time may deliver Notes to the Trustee for
cancellation. The Registrar and Paying Agent shall forward to the Trustee any
Notes surrendered to them for registration of transfer, exchange or payment. The
Trustee and no one else shall cancel all Notes surrendered for registration of
transfer, exchange, payment, replacement or cancellation and shall destroy
canceled Notes (subject to the record retention requirement of the Exchange
Act). Certification of the destruction of all canceled Notes shall be delivered
to the Company. The Company may not issue new Notes to replace Notes that it has
paid or that have been delivered to the Trustee for cancellation.

SECTION 2.12.     DEFAULTED INTEREST.

                  If the Company defaults in a payment of interest on the Notes,
it shall pay the defaulted interest in any lawful manner plus, to the extent
lawful, interest payable on the defaulted interest, to the Persons who are
Holders on a subsequent special record date, in each case at the rate provided
in the Notes and in Section 4.01 hereof. The Company shall notify the Trustee in
writing of the amount of defaulted interest proposed to be paid on each Note and
the date of the proposed payment. The Company shall fix or cause to be fixed
each such special record date and payment date, provided that no such special
record date shall be less than 10 days prior to the related payment date for
such defaulted interest. At least 15 days before the special record date, the
Company (or, upon the written request of the Company, the Trustee in the name
and at the expense of the Company) shall mail or cause to be mailed to Holders a
notice that states the special record date, the related payment date and the
amount of such interest to be paid.

                                   ARTICLE 3.
                            REDEMPTION AND PREPAYMENT

SECTION 3.01.     NOTICES TO TRUSTEE.

                  If the Company elects to redeem Notes pursuant to the optional
redemption provisions of Section 3.07 hereof, it shall furnish to the Trustee,
at least 30 days but not more than 60 days before a redemption date, an
Officers' Certificate setting forth (i) the clause of this Indenture pursuant to
which the redemption shall occur, (ii) the redemption date, (iii) the principal
amount of Notes to be redeemed and (iv) the redemption price (expressed as a
percentage or principal amount).

SECTION 3.02.     SELECTION OF NOTES TO BE REDEEMED

                  If less than all of the Notes are to be redeemed or purchased
in an offer to purchase at any time, the Trustee shall select the Notes to be
redeemed or purchased among the Holders of the Notes in compliance with the
requirements of the principal national securities exchange, if any, on which the
Notes are listed or, if the Notes are not so listed, on a pro rata basis, by lot
or in accordance with any other method the Trustee shall deem fair and
appropriate; provided that no Notes of $1,000 or less shall be redeemed in part.
In the event of partial redemption by lot, the particular Notes to be redeemed
shall be selected, unless otherwise provided herein, not less than 30 nor more
than 60 days prior to the 


                                       40
<PAGE>   41
redemption date by the Trustee from the outstanding Notes not previously called
for redemption.

                  The Trustee shall promptly notify the Company in writing of
the Notes selected for redemption and, in the case of any Note selected for
partial redemption, the principal amount thereof to be redeemed. Notes and
portions of Notes selected shall be in amounts of $1,000 or whole multiples of
$1,000; except that if all of the Notes of a Holder are to be redeemed, the
entire outstanding amount of Notes held by such Holder, even if not a multiple
of $1,000, shall be redeemed. Except as provided in the preceding sentence,
provisions of this Indenture that apply to Notes called for redemption also
apply to portions of Notes called for redemption.

SECTION 3.03.     NOTICE OF REDEMPTION

                  Subject to the provisions of Section 3.09 hereof, at least 30
days but not more than 60 days before a redemption date, the Company shall mail
or cause to be mailed, by first class mail, a notice of redemption to each
Holder whose Notes are to be redeemed at its registered address.

                  The notice shall identify the Notes to be redeemed and shall
state:

                  (a)      the redemption date;

                  (b)      the redemption price;

                  (c)      if any Note is being redeemed in part, the portion of
the principal amount of such Note to be redeemed and that, after the redemption
date upon surrender of such Note, a new Note or Notes in principal amount equal
to the unredeemed portion shall be issued upon cancellation of the original
Note;

                  (d)      the name and address of the Paying Agent;

                  (e)      that Notes called for redemption must be surrendered 
to the Paying Agent to collect the redemption price;

                  (f)      that, unless the Company defaults in making such
redemption payment, interest on Notes called for redemption ceases to accrue on
and after the redemption date;

                  (g)      the paragraph of the Notes and/or Section of this
Indenture pursuant to which the Notes called for redemption are being redeemed;
and

                  (h)      that no representation is made as to the correctness
or accuracy of the CUSIP number, if any, listed in such notice or printed on the
Notes.

                  At the Company's request, the Trustee shall give the notice of
redemption in the Company's name and at its expense; provided, however, that the
Company shall have delivered to the Trustee, at least 45 days prior to the
redemption date, an Officers' Certificate requesting that the Trustee give such
notice and setting forth the information to be stated in such notice as provided
in the preceding paragraph.

SECTION 3.04.     EFFECT OF NOTICE OF REDEMPTION

                  Once notice of redemption is mailed in accordance with Section
3.03 hereof, Notes 


                                       41
<PAGE>   42
called for redemption become irrevocably due and payable on the redemption date
at the redemption price. A notice of redemption may not be conditional.

SECTION 3.05.     DEPOSIT OF REDEMPTION PRICE

                  One Business Day prior to the redemption date, the Company
shall deposit with the Trustee or with the Paying Agent money sufficient to pay
the redemption price of and accrued interest on all Notes to be redeemed on that
date. The Trustee or the Paying Agent shall promptly return to the Company any
money deposited with the Trustee or the Paying Agent by the Company in excess of
the amounts necessary to pay the redemption price of, and accrued interest on,
all Notes to be redeemed.

                  If the Company complies with the provisions of the preceding
paragraph, on and after the redemption date, interest shall cease to accrue on
the Notes or the portions of Notes called for redemption. If a Note is redeemed
on or after an interest record date but on or prior to the related interest
payment date, then any accrued and unpaid interest shall be paid to the Person
in whose name such Note was registered at the close of business on such record
date. If any Note called for redemption shall not be so paid upon surrender for
redemption because of the failure of the Company to comply with the preceding
paragraph, interest shall be paid on the unpaid principal, from the redemption
date until such principal is paid, and to the extent lawful on any interest not
paid on such unpaid principal, in each case at the rate provided in the Notes
and in Section 4.01 hereof.

SECTION 3.06.     NOTES REDEEMED IN PART.

                  Upon surrender of a Note that is redeemed in part, the Company
shall issue and, upon the Company's written request, the Trustee shall
authenticate for the Holder at the expense of the Company a new Note equal in
principal amount to the unredeemed portion of the Note surrendered.

SECTION 3.07.     OPTIONAL REDEMPTION.

                  (a)      Except as set forth in clause (b) of this Section
3.07, the Company shall not have the option to redeem the Notes pursuant to this
Section 3.07 prior to June 15, 2003. Thereafter, the Company shall have the
option to redeem the Notes, in whole or in part, upon not less than 30 nor more
than 60 days' notice, at the redemption prices (expressed as percentages of
principal amount) set forth below plus accrued and unpaid interest and
Liquidated Damages thereon, if any, to the applicable redemption date (subject
to the right of Holders of record on the relevant record date to receive
interest and Liquidated Damages due on the relevant interest payment date), if
redeemed during the twelve-month period beginning on June 15 of the years
indicated below:



YEAR                                                                  PERCENTAGE
                                                                         
2003...................................................................107.000%
2004...................................................................104.667%
2005...................................................................102.333%
2006 and thereafter....................................................100.000%


                  (b)      Notwithstanding the provisions of clause (a) of this
Section 3.07, during the first 36 months after the date of original issuance of
the Notes, the Company may on any one or more occasions redeem up to 35% of the
originally issued aggregate principal amount of the Notes at a redemption price
of 114% of the principal amount thereof on the redemption date, plus accrued and


                                       42
<PAGE>   43
unpaid interest and Liquidated Damages thereon, if any, to the redemption date
(subject to the right of Holders of record on the relevant record date to
receive Liquidated Damages, if any, due on the relevant interest payment date),
with the net cash proceeds of one or more Equity Offerings; provided that at
least 65% of the originally issued aggregate principal amount of the Notes
remains outstanding immediately after the occurrence of such redemption
(excluding Notes held by the Company or any of its Subsidiaries); and provided,
further, that notice of any such redemption shall be given within 60 days of the
date of the closing of such Equity Offering.

                  (c) Any redemption pursuant to this Section 3.07 shall be made
pursuant to the provisions of Section 3.01 through 3.06 hereof.

SECTION 3.08      MANDATORY REDEMPTION.

                  The Company shall not be required to make mandatory redemption
or sinking fund payments with respect to the Notes.

SECTION 3.09      OFFER TO PURCHASE BY APPLICATION OF EXCESS PROCEEDS.

                  In the event that, pursuant to Section 4.10 hereof, the
Company shall be required to commence an offer to holders of Notes (an "Asset
Sale Offer") to purchase the maximum principal amount of Notes it shall follow
the procedures specified below.

                  The Asset Sale Offer shall remain open for a period of 20
Business Days following its commencement and no longer, except to the extent
that a longer period is required by applicable law (the "Offer Period"). No
later than five Business Days after the termination of the Offer Period (the
"Purchase Date"), the Company shall purchase the principal amount of Notes
required to be purchased pursuant to Section 4.10 hereof (on a pro rata basis if
Notes tendered are in excess of the Excess Proceeds) (which maximum principal
amount of Notes shall be the "Offer Amount") or, if less than the Offer Amount
has been tendered, all Notes tendered in response to the Asset Sale Offer.
Payment for any Notes so purchased shall be made in the same manner as interest
payments are made.

                  If the Purchase Date is on or after an interest record date
and on or before the related interest payment date, any accrued and unpaid
interest shall be paid to the Person in whose name a Note is registered at the
close of business on such record date, and no additional interest shall be
payable to Holders who tender Notes pursuant to the Asset Sale Offer.

                  Upon the commencement of an Asset Sale Offer, the Company
shall send, by first class mail, a notice to the Trustee and each of the
Holders, with a copy to the Trustee. The notice shall contain all instructions
and materials necessary to enable such Holders to tender Notes pursuant to the
Asset Sale Offer. The Asset Sale Offer shall be made to all Holders. The notice,
which shall govern the terms of the Asset Sale Offer, shall state:

                  (a) that the Asset Sale Offer is being made pursuant to this
Section 3.09 and Section 4.10 hereof and the length of time the Asset Sale Offer
shall remain open;

                  (b) the Offer Amount, the purchase price and the Purchase
Date;

                  (c) that any Note not tendered or accepted for payment shall
continue to accrue interest;


                                       43
<PAGE>   44
                  (d) that, unless the Company defaults in making such payment,
any Note accepted for payment pursuant to the Asset Sale Offer shall cease to
accrue interest after the Purchase Date;

                  (e) that Holders electing to have a Note purchased pursuant to
an Asset Sale Offer may only elect to have all of such Note purchased and may
not elect to have only a portion of such Note purchased;

                  (f) that Holders electing to have a Note purchased pursuant to
any Asset Sale Offer shall be required to surrender the Note, with the form
entitled "Option of Holder to Elect Purchase" on the reverse of the Note
completed, or transfer by book-entry transfer, to the Company, the Depositary,
if appointed by the Company, or a Paying Agent at the address specified in the
notice at least three days before the Purchase Date;

                  (g) that Holders shall be entitled to withdraw their election
if the Company, the Depositary or the Paying Agent, as the case may be,
receives, not later than the expiration of the Offer Period, a telegram, telex,
facsimile transmission or letter setting forth the name of the Holder, the
principal amount of the Note the Holder delivered for purchase and a statement
that such Holder is withdrawing his election to have such Note purchased;

                  (h) that, if the aggregate principal amount of Notes tendered
by Holders exceeds the Offer Amount, the Company shall select the Notes to be
purchased on a pro rata basis (with such adjustments as may be deemed
appropriate by the Company so that only Notes in denominations of $1,000, or
integral multiples thereof, shall be purchased); and

                  (i) that Holders whose Notes were purchased only in part shall
be issued new Notes equal in principal amount to the unpurchased portion of the
Notes surrendered (or transferred by book-entry transfer).

                  On or before the Purchase Date, the Company shall, to the
extent lawful, accept for payment, on a pro rata basis to the extent necessary,
the Offer Amount of Notes or portions thereof tendered pursuant to the Asset
Sale Offer, or if less than the Offer Amount has been tendered, all Notes or
portions thereof tendered, and shall deliver to the Trustee an Officers'
Certificate stating that such Notes or portions thereof were accepted for
payment by the Company in accordance with the terms of this Section 3.09. The
Company, the Depositary or the Paying Agent, as the case may be, shall promptly
(but in any case not later than five days after the Purchase Date) mail or
deliver to each tendering Holder an amount equal to the purchase price of the
Notes tendered by such Holder and accepted by the Company for purchase, and the
Company shall promptly issue a new Note, and the Trustee, upon written request
from the Company, shall authenticate and mail or deliver such new Note to such
Holder, in a principal amount equal to any unpurchased portion of the Note
surrendered. Any Note not so accepted shall be promptly mailed or delivered by
the Company to the Holder thereof. The Company shall publicly announce the
results of the Asset Sale Offer on the Purchase Date.

                  Other than as specifically provided in this Section 3.09, any
purchase pursuant to this Section 3.09 shall be made pursuant to the provisions
of Sections 3.01 through 3.06 hereof.

                                   ARTICLE 4.
                                    COVENANTS

SECTION 4.01      PAYMENT OF NOTES.


                                       44
<PAGE>   45
                  The Company shall pay or cause to be paid the principal of,
premium, if any, and interest and Liquidated Damages, if any, on the Notes on
the dates and in the manner provided in the Notes. Principal, premium, if any,
interest and Liquidated Damages, if any, shall be considered paid on the date
due if the Paying Agent, if other than the Company or a Subsidiary thereof,
holds as of 10:00 a.m. Eastern Time on the due date money deposited by the
Company in immediately available funds and designated for and sufficient to pay
all principal, premium, if any, interest and Liquidated Damages, if any, then
due. The Company shall pay all Liquidated Damages, if any, in the same manner on
the dates and in the amounts set forth in the Registration Rights Agreement.

                  The Company shall pay interest (including post-petition
interest in any proceeding under any Bankruptcy Law) on overdue principal at the
rate equal to 1% per annum in excess of the then applicable interest rate on the
Notes to the extent lawful; it shall pay interest (including post-petition
interest in any proceeding under any Bankruptcy Law) on overdue installments of
interest and Liquidated Damages (without regard to any applicable grace period)
at the same rate to the extent lawful.

SECTION 4.02      MAINTENANCE OF OFFICE OR AGENCY.

                  The Company shall maintain in the Borough of Manhattan, the
City of New York, an office or agency (which may be an office of the Trustee or
an affiliate of the Trustee, Registrar or co-registrar) where Notes may be
surrendered for registration of transfer or for exchange and where notices and
demands to or upon the Company in respect of the Notes and this Indenture may be
served. The Company shall give prompt written notice to the Trustee of the
location, and any change in the location, of such office or agency. If at any
time the Company shall fail to maintain any such required office or agency or
shall fail to furnish the Trustee with the address thereof, such presentations,
surrenders, notices and demands may be made or served at the Corporate Trust
Office of the Trustee.

                  The Company may also from time to time designate one or more
other offices or agencies where the Notes may be presented or surrendered for
any or all such purposes and may from time to time rescind such designations;
provided, however, that no such designation or rescission shall in any manner
relieve the Company of its obligation to maintain an office or agency in the
Borough of Manhattan, the City of New York for such purposes. The Company shall
give prompt written notice to the Trustee of any such designation or rescission
and of any change in the location of any such other office or agency.

                  The Company hereby designates the Corporate Trust Office of
the Trustee as one such office or agency of the Company in accordance with
Section 2.03 hereof.

SECTION 4.03      REPORTS.

                  (a) Whether or not required by the rules and regulations of
the SEC, so long as any Notes are outstanding, the Company shall furnish to the
Holders of Notes (i) all quarterly and annual financial information that would
be required to be contained in a filing with the SEC on Forms 10-Q and 10-K if
the Company were required to file such forms, including a "Management's
Discussion and Analysis of Financial Condition and Results of Operations" that
describes the financial condition and results of operations of the Company and
its consolidated Subsidiaries (showing in reasonable detail, in the footnotes to
the financial statements and in "Management's Discussion and Analysis of
Financial Condition and Results of Operations" (in each case to the extent not
prohibited by the SEC's rules and regulations), the financial condition and
results of operations of the Company and its Restricted Subsidiaries separate
from the financial condition and results of operations of the Unrestricted


                                       45
<PAGE>   46
Subsidiaries of the Company and, with respect to the annual information only, a
report thereon by the Company's certified independent accountants and (ii) all
current reports that would be required to be filed with the SEC on Form 8-K if
the Company were required to file such reports, in each case within the time
periods specified in the SEC's rules and regulations; provided, however, that
with respect to quarterly information relating to the fiscal quarter of the
Company ending on June 30, 1998, the Company shall not be required to furnish
such quarterly information to the Holders of Notes until 60 days after the end
of such quarter. In addition, following consummation of the Exchange Offer
contemplated by the Registration Rights Agreement, whether or not required by
the rules and regulations of the SEC, the Company shall file a copy of all such
information and reports with the SEC for public availability within the time
periods specified in the SEC's rules and regulations (unless the SEC will not
accept such a filing) and make such information available to securities analysts
and prospective investors upon request. The Company shall at times comply with
TIA Section 314(a).

                  (b) For so long as any Notes remain outstanding, the Company
shall furnish to the Holders and to securities analysts and prospective
investors, upon their request, the information required to be delivered pursuant
to Rule 144A(d)(4) under the Securities Act.

SECTION 4.04      COMPLIANCE CERTIFICATE.

                  (a) The Company shall deliver to the Trustee, within 90 days
after the end of each fiscal year, an Officers' Certificate stating that a
review of the activities of the Company and its Subsidiaries during the
preceding fiscal year has been made under the supervision of the signing
Officers with a view to determining whether the Company has kept, observed,
performed and fulfilled its obligations under this Indenture, and further
stating, as to each such Officer signing such certificate, that to the best of
his or her knowledge the Company has kept, observed, performed and fulfilled
each and every covenant contained in this Indenture and is not in default in the
performance or observance of any of the terms, provisions and conditions of this
Indenture (or, if a Default or Event of Default shall have occurred, describing
all such Defaults or Events of Default of which he or she may have knowledge and
what action the Company is taking or proposes to take with respect thereto) and
that to the best of his or her knowledge no event has occurred and remains in
existence by reason of which payments on account of the principal of or interest
or Liquidated Damages, if any, on the Notes is prohibited or if such event has
occurred, a description of the event and what action the Company is taking or
proposes to take with respect thereto.

                  (b) So long as not contrary to the then current
recommendations of the American Institute of Certified Public Accountants, the
year-end financial statements delivered pursuant to Section 4.03(a) above shall
be accompanied by a written statement of the Company's independent public
accountants (who shall be a firm of established national reputation) that in
making the examination necessary for certification of such financial statements,
nothing has come to their attention that would lead them to believe that the
Company has violated any provisions of Article 4 or Article 5 hereof or, if any
such violation has occurred, specifying the nature and period of existence
thereof, it being understood that such accountants shall not be liable directly
or indirectly to any Person for any failure to obtain knowledge of any such
violation.

                  (c) The Company shall, so long as any of the Notes are
outstanding, deliver to the Trustee, forthwith upon any Officer becoming aware
of any Default or Event of Default, an Officers' Certificate specifying such
Default or Event of Default and what action the Company is taking or proposes to
take with respect thereto.


                                       46
<PAGE>   47
SECTION 4.05      TAXES.

                  The Company shall pay, and shall cause each of its
Subsidiaries to pay, prior to delinquency, all material taxes, assessments, and
governmental levies except such as are contested in good faith and by
appropriate proceedings or where the failure to effect such payment is not
adverse in any material respect to the Holders of the Notes.

SECTION 4.06      STAY, EXTENSION AND USURY LAWS.

                  The Company covenants (to the extent that it may lawfully do
so) that it shall not at any time insist upon, plead, or in any manner
whatsoever claim or take the benefit or advantage of, any stay, extension or
usury law wherever enacted, now or at any time hereafter in force, that may
affect the covenants or the performance of this Indenture; and the Company (to
the extent that it may lawfully do so) hereby expressly waives all benefit or
advantage of any such law, and covenants that it shall not, by resort to any
such law, hinder, delay or impede the execution of any power herein granted to
the Trustee, but shall suffer and permit the execution of every such power as
though no such law has been enacted.

SECTION 4.07      RESTRICTED PAYMENTS.

                  The Company shall not, and shall not permit any of its
Restricted Subsidiaries to, directly or indirectly: (i) declare or pay any
dividend or make any other payment or distribution on account of the Company's
or any of its Restricted Subsidiaries' Equity Interests (including, without
limitation, any payment in connection with any merger or consolidation involving
the Company or any of its Restricted Subsidiaries) or to the direct or indirect
holders of the Company's or any of its Restricted Subsidiaries' Equity Interests
in their capacity as such (other than cash to the extent required to pay for
fractional shares of such Equity Interests (other than Disqualified Stock),
dividends or distributions payable in Equity Interests (other than Disqualified
Stock) of the Company or to the Company or a Restricted Subsidiary of the
Company and other than dividends, payments or other distributions on or with
respect to any Equity Interests of any Restricted Subsidiary of the Company to
the holders of its Equity Interests on a pro rata basis); (ii) purchase, redeem
or otherwise acquire or retire for value (including without limitation, in
connection with any merger or consolidation involving the Company) any Equity
Interests of the Company or any direct or indirect parent of the Company (other
than any such Equity Interests owned by the Company or any Restricted Subsidiary
of the Company); (iii) make any payment on or with respect to, or purchase,
redeem, defease or otherwise acquire or retire for value any Indebtedness that
is subordinated to the Notes, except a payment of interest or principal at
Stated Maturity; or (iv) make any Restricted Investment (all such payments and
other actions set forth in clauses (i) through (iv) above being collectively
referred to as "Restricted Payments"), unless, at the time of and after giving
effect to such Restricted Payment:

                  (a) no Default or Event of Default shall have occurred and be
continuing or would occur as a consequence thereof; and

                  (b) the Company would have been permitted to incur at least
$1.00 of additional Indebtedness pursuant to the Debt to Consolidated Cash Flow
Ratio test set forth in Section 4.09 hereof; and

                  (c) such Restricted Payment, together with the aggregate
amount of all other Restricted Payments made by the Company and its Restricted
Subsidiaries after the date of this Indenture (excluding Restricted Payments
permitted by clauses (ii) through (v) of the next succeeding paragraph),


                                       47
<PAGE>   48
is less than the sum, without duplication, of (i) 50% of the Consolidated Net
Income of the Company for the period (taken as one accounting period) from the
beginning of the first fiscal quarter commencing after the date of this
Indenture to the end of the Company's most recently ended fiscal quarter for
which internal financial statements are available at the time of such Restricted
Payment (or, if such Consolidated Net Income for such period is a deficit, less
100% of such deficit), plus (ii) 100% of the aggregate net cash proceeds
received by the Company since the date of this Indenture as a contribution to
its common equity capital or from the issue or sale of Equity Interests of the
Company (other than Disqualified Stock and except to the extent such net cash
proceeds are used to incur new Indebtedness outstanding pursuant to clause (ix)
in Section 4.09 hereof) or from the issue or sale of Disqualified Stock or debt
securities of the Company that have been converted into such Equity Interests
(other than Equity Interests (or Disqualified Stock or convertible debt
securities) sold to a Subsidiary of the Company and other than Disqualified
Stock or convertible debt securities that have been converted into Disqualified
Stock), plus (iii) to the extent that any Restricted Investment that was made
after the date of this Indenture is sold for cash or otherwise liquidated or
repaid for cash, the lesser of (A) the cash return of capital with respect to
such Restricted Investment (less the cost of disposition, if any) and (B) the
initial amount of such Restricted Investment, plus (iv) to the extent that any
Unrestricted Subsidiary of the Company is designated as a Restricted Subsidiary
after the date of this Indenture, the lesser of (A) the Fair Market Value of the
Company's Investment in such Subsidiary as of the date of such designation, or
(B) the sum of (x) the Fair Market Value of the Company's Investment in such
Subsidiary as of the date on which such Subsidiary was originally designated as
an Unrestricted Subsidiary and (y) the amount of any Investments made in such
Subsidiary subsequent to such designation (and treated as a Restricted Payment)
by the Company or any Restricted Subsidiary, plus (v) 50% of any dividends
received by the Company or a Restricted Subsidiary after the date of this
Indenture from an Unrestricted Subsidiary of the Company, to the extent that
such dividends were not otherwise included in Consolidated Net Income of the
Company for such period.

                  The foregoing provisions shall not prohibit (i) the payment of
any dividend within 60 days after the date of declaration thereof, if at said
date of declaration such payment would have complied with the provisions of this
Indenture; (ii) the making of any Investment or the redemption, repurchase,
retirement, defeasance or other acquisition of any subordinated Indebtedness or
Equity Interests of the Company in exchange for, or out of the net cash proceeds
of the substantially concurrent sale (other than to a Subsidiary of the Company)
of, any Equity Interests of the Company (other than any Disqualified Stock;
provided that such net cash proceeds are not used to incur new Indebtedness
pursuant to clause (ix) in Section 4.09 hereof); and provided further that, in
each such case, the amount of any such net cash proceeds that are so utilized
shall be excluded from clause (c) (ii) of the preceding paragraph; (iii) the
defeasance, redemption, repurchase or other acquisition of subordinated
Indebtedness with the net cash proceeds from an incurrence of Permitted
Refinancing Indebtedness; (iv) payments or distributions to dissenting
stockholders, pursuant to applicable law, pursuant to or in connection with a
consolidation, merger or transfer of assets that complies with the provisions of
Article 5 of this Indenture applicable to mergers, consolidations and transfers
of all or substantially all of the property and assets of the Company; and (v)
the repurchase, retirement or other acquisition or retirement for value of
Equity Interests of the Company that is held by any current or former employee,
director or consultant (or their estates or the beneficiaries of such estates)
of the Company or any Subsidiary, not to exceed (A) $1,000,000 in any calendar
year or (B) $5,000,000 in aggregate.

                  The Board of Directors may designate any Restricted Subsidiary
to be an Unrestricted Subsidiary if such designation would not cause a Default
or Event of Default; provided that in no event shall the businesses operated by
the Company's Restricted Subsidiaries as of the date of this Indenture be
transferred to or held by an Unrestricted Subsidiary. For purposes of making
such determination, all 


                                       48
<PAGE>   49
outstanding Investments by the Company and its Restricted Subsidiaries (except
to the extent repaid in cash) in the Subsidiary so designated shall be deemed to
be Restricted Payments at the time of such designation and shall reduce the
amount available for Restricted Payments under the first paragraph of this
Section. All such outstanding Investments will be deemed to constitute
Investments in an amount equal to the Fair Market Value of such Investments at
the time of such designation. Such designation will only be permitted if such
Restricted Payment would be permitted at such time and if such Restricted
Subsidiary otherwise meets the definition of an Unrestricted Subsidiary. The
Board of Directors may designate any Unrestricted Subsidiary to be a Restricted
Subsidiary if such designation would not cause a Default or Event of Default.

                  The amount of all Restricted Payments (other than cash) shall
be the Fair Market Value on the date of the Restricted Payment of the asset(s)
or securities proposed to be transferred or issued by the Company or the
applicable Restricted Subsidiary, as the case may be, pursuant to the Restricted
Payment.

SECTION 4.08      DIVIDEND AND OTHER PAYMENT RESTRICTIONS AFFECTING
                  SUBSIDIARIES.

                  The Company shall not, and shall not permit any of its
Restricted Subsidiaries to, directly or indirectly, create or otherwise cause or
suffer to exist or become effective any encumbrance or restriction on the
ability of any Restricted Subsidiary to (i)(a) pay dividends or make any other
distributions to the Company or any of its Restricted Subsidiaries (1) on its
Capital Stock or (2) with respect to any other interest or participation in, or
measured by, its profits, or (b) pay any indebtedness owed to the Company or any
of its Restricted Subsidiaries, (ii) make loans or advances to the Company or
any of its Restricted Subsidiaries or (iii) transfer any of its properties or
assets to the Company or any of its Restricted Subsidiaries. However, the
foregoing restrictions shall not apply to encumbrances or restrictions existing
under or by reason of (a) Existing Indebtedness as in effect on the date of this
Indenture, and any amendments, modifications, restatements, renewals, increases,
supplements, refundings, replacements or refinancings thereof; provided that
such amendments, modifications, restatements, renewals, increases, supplements,
refundings, replacements or refinancings are no more restrictive, taken as a
whole, with respect to such dividend and other payment restrictions than those
contained in the applicable series of Existing Indebtedness as in effect on the
date of this Indenture, (b) any Indebtedness or any agreement pursuant to which
such Indebtedness was issued if (A) the encumbrance or restriction either (1)
applies only in the event of a payment default or a default with respect to a
financial covenant contained in such Indebtedness or agreement or (2) is
contained in one or more Credit Facilities, and (B) the encumbrance or
restriction is not materially more disadvantageous to the Holders of the Notes
than is customary in comparable financings (as determined in good faith by the
Company) based on market conditions prevailing at the time such encumbrance or
restriction is created, (c) this Indenture and the Notes, (d) applicable law,
(e) any instrument governing Indebtedness or Capital Stock of a Person acquired
by the Company or any of its Restricted Subsidiaries as in effect at the time of
such acquisition (except to the extent such Indebtedness was incurred in
connection with or in contemplation of such acquisition), which encumbrance or
restriction is not applicable to any Person, or the properties or assets of any
Person, other than the Person, or the property or assets of the Person, so
acquired, provided that, in the case of Indebtedness, such Indebtedness was
permitted by the terms of this Indenture to be incurred, (f) customary
non-assignment provisions in leases or licenses entered into in the ordinary
course of business, (g) purchase money obligations for property acquired in the
ordinary course of business that impose restrictions of the nature described in
clause (iii) above on the property so acquired, (h) any agreement for the sale
of a Restricted Subsidiary that restricts that Restricted Subsidiary pending its
sale, (i) Permitted Refinancing Indebtedness, provided that the restrictions
contained in the agreements governing such Permitted Refinancing Indebtedness
are no more restrictive


                                       49
<PAGE>   50
than those contained in the agreements governing the Indebtedness being
refinanced, (j) Liens permitted to be incurred pursuant to the provisions of
Section 4.12 hereof and (k) customary provisions with respect to the disposition
or distribution of assets or property in joint venture agreements and other
similar agreements.

SECTION 4.09      INCURRENCE OF INDEBTEDNESS AND ISSUANCE OF DISQUALIFIED STOCK.

                  The Company shall not, and shall not permit any of its
Restricted Subsidiaries to, directly or indirectly, create, incur, issue,
assume, guarantee or otherwise become directly or indirectly liable,
contingently or otherwise, with respect to (collectively, "incur") any
Indebtedness (including Acquired Debt) and the Company shall not issue any
Disqualified Stock and shall not permit any of its Restricted Subsidiaries to
issue any shares of preferred stock; provided, however, that the Company may
incur Indebtedness (including Acquired Debt) or issue shares of Disqualified
Stock and the Company's Restricted Subsidiaries may incur Eligible Indebtedness
if, in each case, (i) no Default or Event of Default shall have occurred and be
continuing or would occur as a consequence thereof and (ii) the Debt to
Consolidated Cash Flow Ratio at the time of incurrence of such Indebtedness or
the issuance of such Disqualified Stock, after giving pro forma effect to such
incurrence or issuance as of such date and to the use of proceeds therefrom as
if the same had occurred at the beginning of the most recently ended four full
fiscal quarter period of the Company for which internal financial statements are
available, would have been no greater than 5.5 to 1.

                  The provisions of the first paragraph of this Section shall
not apply to the incurrence of any of the following items of Indebtedness
(collectively, "Permitted Debt"):

                  (i) the incurrence by the Company or any of its Restricted
         Subsidiaries of Indebtedness under Credit Facilities in an aggregate
         principal amount (with letters of credit being deemed to have a
         principal amount equal to the maximum potential liability of the
         Company and its Restricted Subsidiaries thereunder) at any one time
         outstanding not to exceed the greater of (x) $50,000,000 less the
         aggregate amount of all Net Proceeds of Asset Sales applied to repay
         Indebtedness under a Credit Facility pursuant to Section 4.10 hereof
         and (y) 80% of the Eligible Receivables that are outstanding as of such
         date of incurrence;

                  (ii) the incurrence by the Company and its Restricted 
         Subsidiaries of Existing Indebtedness;

                  (iii) the incurrence by the Company of Indebtedness
         represented by the Notes and the New Notes;

                  (iv) the incurrence by the Company or any of its Restricted
         Subsidiaries of Indebtedness to finance the cost (including the cost of
         design, development, acquisition, construction, installation,
         improvement, transportation or integration) to acquire equipment,
         inventory or network assets (including acquisitions of the Capital
         Stock of a Person that is or becomes a Restricted Subsidiary of the
         Company to the extent of the Fair Market Value of the equipment,
         inventory or network assets so acquired) after the date of this
         Indenture;

                  (v) the incurrence by the Company or any of its Restricted
         Subsidiaries of Permitted Refinancing Indebtedness in exchange for, or
         the net proceeds of which are used to extend, refinance, renew,
         replace, defease or refund Indebtedness (other than intercompany
         Indebtedness) that was permitted by this Indenture to be incurred under
         the first paragraph hereof


                                       50
<PAGE>   51
         or clauses (ii) through (v) of this paragraph;

                  (vi) the incurrence by the Company or any of its Restricted
         Subsidiaries of intercompany Indebtedness between or among the Company
         and any of its Restricted Subsidiaries; provided, however, that (i) if
         the Company is the obligor on such Indebtedness, such Indebtedness is
         expressly subordinated to the prior payment in full in cash of all
         Obligations with respect to the Notes and (ii) (A) any subsequent
         issuance or transfer of Equity Interests that results in any such
         Indebtedness being held by a Person other than the Company or a
         Restricted Subsidiary and (B) any sale or other transfer of any such
         Indebtedness to a Person that is not either the Company or a Restricted
         Subsidiary shall be deemed, in each case, to constitute an incurrence
         of such Indebtedness by the Company or such Restricted Subsidiary, as
         the case may be, not permitted by this clause (vi) of this paragraph;

                  (vii) the incurrence by the Company or any of its Restricted
         Subsidiaries of Hedging Obligations that are incurred for the purpose
         of fixing or hedging interest rate risk with respect to any floating
         rate Indebtedness that is permitted by the terms of this Section 4.09
         to be outstanding or currency exchange risk;

                  (viii) the guarantee by the Company or any of its Restricted
         Subsidiaries of Indebtedness of the Company or a Restricted Subsidiary
         of the Company that was permitted to be incurred by another provision
         of this Section 4.09;

                  (ix) the incurrence by the Company of Indebtedness or by a
         Restricted Subsidiary of the Company of Acquired Debt not to exceed, at
         any one time outstanding the sum of (A) 2.0 times the aggregate net
         cash proceeds received by the Company after the date of this Indenture
         from the issuance and sale of its Common Stock (other than Disqualified
         Stock) to a Person that is not a Subsidiary of the Company, to the
         extent such net cash proceeds have not been used pursuant to clause
         (c)(ii) of the first paragraph or clause (ii) of the second paragraph
         of Section 4.07 hereof to make a Restricted Payment and (B) the Fair
         Market Value of assets (other than cash and Cash Equivalents) that are
         used or useful in a Telecommunications Business or Capital Stock of a
         Person engaged in a Telecommunications Business that is or becomes a
         Restricted Subsidiary of the Company, in each case, received by the
         Company after the date of this Indenture from the issuance and sale of
         its Common Stock (other than Disqualified Stock) to a Person that is
         not a Subsidiary of the Company, to the extent such issuance and sale
         of Common Stock has not been used pursuant to clause (ii) of the second
         paragraph of Section 4.07 hereof to effect a Restricted Payment; and
         provided further that such Indebtedness (other than Acquired Debt) does
         not mature prior to the Stated Maturity of the Notes and the Weighted
         Average Life to Maturity of such Indebtedness is longer than that of
         the Notes;

                  (x) the incurrence by the Company of Indebtedness, to the
         extent that the net proceeds thereof are promptly (A) used to
         repurchase Notes tendered in a Change of Control Offer or (B) deposited
         to defease all of the Notes as described in Article 8 of this
         Indenture; and

                  (xi) the incurrence by the Company or any of its Restricted
         Subsidiaries of additional Indebtedness in an aggregate principal
         amount (or accreted value, as applicable) at any time outstanding, not
         to exceed $50,000,000.

                  The Company shall not (i) incur any Indebtedness that is
contractually subordinated in right of payment to any other Indebtedness of the
Company unless such Indebtedness is also 


                                       51
<PAGE>   52
contractually subordinated in right of payment to the Notes on substantially
identical terms; provided, however, that no Indebtedness of the Company shall be
deemed to be contractually subordinated in right of payment to any other
Indebtedness of the Company solely by virtue of being unsecured and (ii) the
Company shall not permit any of its Unrestricted Subsidiaries to incur any
Indebtedness other than Non-Recourse Debt.

                  For purposes of determining compliance with this Section 4.09,
in the event that an item of Indebtedness meets the criteria of more than one of
the categories of Permitted Debt described in clauses (i) through (xi) above or
is entitled to be incurred pursuant to the first paragraph of this Section 4.09,
the Company shall, in its sole discretion, classify such item of Indebtedness in
any manner that complies with this Section 4.09 and may from time to time
reclassify such item of Indebtedness in any manner that would comply with this
Section 4.09 at the time of reclassification. Accrual of interest, accrual of
dividends, accretion or amortization of original issue discount and the payment
of interest in the form of additional Indebtedness, and the payment of dividends
in the form of additional shares of Disqualified Stock shall not be deemed to be
an incurrence of Indebtedness or an issuance of Disqualified Stock, as the case
may be, for purposes of this Section 4.09.

SECTION 4.10      ASSET SALES

                  The Company shall not, and shall not permit any of its
Restricted Subsidiaries to, consummate an Asset Sale unless (i) the Company (or
the Restricted Subsidiary, as the case may be) receives consideration at the
time of such Asset Sale at least equal to the Fair Market Value of the assets or
Equity Interests issued or sold or otherwise disposed of and (ii) at least 75%
of the consideration therefor received by the Company or such Restricted
Subsidiary is in the form of cash or Cash Equivalents; provided that the amount
of (x) any liabilities (as shown on the Company's or such Restricted
Subsidiary's most recent balance sheet), of the Company or any Restricted
Subsidiary (other than contingent liabilities and liabilities that are by their
terms subordinated to the Notes or any guarantee thereof) that are assumed by
the transferee of any such assets pursuant to a binding written agreement that
releases the Company or such Restricted Subsidiary from further liability and
(y) any securities, notes or other obligations received by the Company or any
such Restricted Subsidiary from such transferee that are converted by the
Company or such Restricted Subsidiary into cash within 30 days of the applicable
Asset Sale (to the extent of the cash received), shall be deemed to be cash for
purposes of this provision.

                  Within 365 days after the receipt of any Net Proceeds from an
Asset Sale, the Company or the applicable Restricted Subsidiary may apply such
Net Proceeds to: (a) the reduction of Indebtedness under a Credit Facility; (b)
the reduction of other Indebtedness of any of the Company's Restricted
Subsidiaries; (c) the acquisition of all or substantially all the assets of a
Telecommunications Business; (d) the acquisition of Voting Stock of a Person
engaged in the Telecommunications Business from a Person that is not a
Subsidiary of the Company; provided, that, after giving effect thereto, the
Person whose Voting Stock was so acquired is a Restricted Subsidiary of the
Company; or (e) the making of a capital expenditure or the acquisition of other
long-term assets that are used or useful in a Telecommunications Business.
Pending the final application of any such Net Proceeds, the Company may
temporarily reduce revolving credit borrowings or otherwise invest such Net
Proceeds in any manner that is not prohibited by this Indenture. Any Net
Proceeds from Asset Sales that are not applied or invested as provided in the
first sentence of this paragraph shall be deemed to constitute "Excess
Proceeds." When the aggregate amount of Excess Proceeds exceeds $5,000,000, the
Company shall be required to make an offer to all Holders of Notes and all
holders of other senior Indebtedness of the Company containing provisions
similar to those set forth in this Indenture with respect to offers to


                                       52
<PAGE>   53
purchase or redeem with the proceeds of sales of assets (an "Asset Sale Offer")
to purchase the maximum principal amount of Notes and such other senior
Indebtedness of the Company that may be purchased out of the Excess Proceeds, at
an offer price in cash in an amount equal to 100% of the principal amount
thereof plus accrued and unpaid interest and Liquidated Damages thereon, if any,
to the date of purchase (subject to the right of Holders of record on the
relevant record date to receive interest and Liquidated Damages, if any, due on
the relevant interest payment date), in accordance with the procedures set forth
in this Indenture and such other senior Indebtedness of the Company. To the
extent that any Excess Proceeds remain after consummation of an Asset Sale
Offer, the Company may use such Excess Proceeds for any purpose not otherwise
prohibited by this Indenture. If the aggregate principal amount of Notes and
such other senior Indebtedness of the Company tendered into such Asset Sale
Offer surrendered by Holders thereof exceeds the amount of Excess Proceeds, the
Trustee shall select the Notes and such other senior Indebtedness to be
purchased on a pro rata basis. Upon completion of such offer to purchase, the
amount of Excess Proceeds shall be reset at zero.

SECTION 4.11      TRANSACTIONS WITH AFFILIATES.

                  The Company shall not, and shall not permit any of its
Restricted Subsidiaries to, make any payment to, or sell, lease, transfer or
otherwise dispose of any of its properties or assets to, or purchase any
property or assets from, or enter into or make or amend any transaction,
contract, agreement, understanding, loan, advance or guarantee with, or for the
benefit of, any Affiliate (each of the foregoing, an "Affiliate Transaction"),
unless (i) such Affiliate Transaction is on terms that are no less favorable to
the Company or the relevant Restricted Subsidiary than those that would have
been obtained in a comparable transaction by the Company or such Restricted
Subsidiary with an unrelated Person and (ii) the Company delivers to the Trustee
(a) with respect to any Affiliate Transaction or series of related Affiliate
Transactions involving aggregate consideration in excess of $1,000,000, a
resolution of the Board of Directors set forth in an Officers' Certificate
certifying that such Affiliate Transaction complies with clause (i) above and
that such Affiliate Transaction has been approved by a majority of the
disinterested members of the Board of Directors and (b) with respect to any
Affiliate Transaction or series of related Affiliate Transactions involving
aggregate consideration in excess of $5,000,000, an opinion as to the fairness
to the Holders of such Affiliate Transaction from a financial point of view
issued by a nationally recognized investment banking firm (or, if no such
investment banking firm is qualified to issue such an opinion, by a nationally
recognized appraisal firm or public accounting firm). Notwithstanding the
foregoing, the following items shall not be deemed to be Affiliate Transactions:
(i) any employment arrangements with any executive officer of the Company or a
Restricted Subsidiary that is entered into by the Company or any of its
Restricted Subsidiaries in the ordinary course of business and consistent with
past practice, (ii) transactions between or among the Company and/or its
Restricted Subsidiaries, (iii) payment of directors fees in an aggregate annual
amount not to exceed $25,000 per Person, (iv) Restricted Payments that are
permitted by the provisions of Section 4.07 hereof and (v) the issuance or sale
of Equity Interests (other than Disqualified Stock) of the Company.

SECTION 4.12      LIENS.

                  The Company shall not, and shall not permit any of its
Restricted Subsidiaries to, directly or indirectly, create, incur, assume or
suffer to exist any Lien securing Indebtedness or trade payables on any asset
now owned or hereafter acquired, or any income or profits therefrom or assign or
convey any right to receive income therefrom, except Permitted Liens.

SECTION 4.13      BUSINESS ACTIVITIES.


                                       53
<PAGE>   54
                  The Company shall not, and shall not permit any Restricted
Subsidiary to, engage in any business other than a Telecommunications Business,
except to such extent as would not be material to the Company and its Restricted
Subsidiaries taken as a whole.

SECTION 4.14      CORPORATE EXISTENCE.

                  Subject to Article 5 hereof, the Company shall do or cause to
be done all things necessary to preserve and keep in full force and effect (i)
its corporate existence, and the corporate, partnership or other existence of
each of its Restricted Subsidiaries, in accordance with the respective
organizational documents (as the same may be amended from time to time) of the
Company or any such Restricted Subsidiary and (ii) the rights (charter and
statutory), licenses and franchises of the Company and its Subsidiaries;
provided, however, that the Company shall not be required to preserve any such
right, license or franchise, or the corporate, partnership or other existence of
any of its Restricted Subsidiaries, if the Board of Directors shall determine
that the preservation thereof is no longer desirable in the conduct of the
business of the Company and its Restricted Subsidiaries, taken as a whole, and
that the loss thereof is not adverse in any material respect to the Holders of
the Notes.

SECTION 4.15      OFFER TO REPURCHASE UPON CHANGE OF CONTROL.

                  (a) Upon the occurrence of a Change of Control, each Holder of
Notes shall have the right to require the Company to repurchase all or any part
(equal to $1,000 or an integral multiple thereof) of such Holder's Notes
pursuant to the offer described below (the "Change of Control Offer") at an
offer price in cash equal to 101% of the principal amount thereof plus accrued
and unpaid interest and Liquidated Damages thereon, if any (subject to the right
of Holders of record on the relevant record date to receive interest and
Liquidated Damages, if any, due on the relevant interest payment date), to the
date of purchase (the "Change of Control Payment"). Within 60 days following any
Change of Control, the Company shall state: (i) that the Change of Control Offer
is being made pursuant to this Section 4.15 and that all Notes tendered will be
accepted for payment; (ii) the purchase price and the purchase date, which shall
be no earlier than 30 business days and no later than 60 days from the date such
notice is mailed (the "Change of Control Payment Date"); (iii) that any Note not
tendered will continue to accrue interest; (iv) that, unless the Company
defaults in the payment of the Change of Control Payment, all Notes accepted for
payment pursuant to the Change of Control Offer shall cease to accrue interest
after the Change of Control Payment Date; (v) that Holders electing to have any
Notes purchased pursuant to a Change of Control Offer will be required to
surrender the Notes, with the form entitled "Option of Holder to Elect Purchase"
on the reverse of the Notes completed, to the Paying Agent at the address
specified in the notice prior to the close of business on the third Business Day
preceding the Change of Control Payment Date; (vi) that Holders will be entitled
to withdraw their election if the Paying Agent receives, not later than the
close of business on the second Business Day preceding the Change of Control
Payment Date, a telegram, telex, facsimile transmission or letter setting forth
the name of the Holder, the principal amount of Notes delivered for purchase,
and a statement that such Holder is withdrawing his election to have the Notes
purchased; and (vii) that Holders whose Notes are being purchased only in part
will be issued new Notes equal in principal amount to the unpurchased portion of
the Notes surrendered, which unpurchased portion must be equal to $1,000 in
principal amount or an integral multiple thereof.

                  (b) On the Change of Control Payment Date, the Company shall,
to the extent lawful, (i) accept for payment all Notes or portions thereof
properly tendered pursuant to the Change of Control Offer, (ii) deposit with the
Paying Agent an amount equal to the Change of Control Payment in 


                                       54
<PAGE>   55
respect of all Notes or portions thereof so tendered and (iii) deliver or cause
to be delivered to the Trustee the Notes so accepted together with an Officers'
Certificate stating the aggregate principal amount of Notes or portions thereof
being purchased by the Company. The Paying Agent shall promptly mail to each
Holder of Notes so tendered the Change of Control Payment for such Notes, and
the Trustee shall promptly authenticate and mail (or cause to be transferred by
book entry) to each Holder a new Note equal in principal amount to any
unpurchased portion of the Notes surrendered, if any; provided that each such
new Note shall be in a principal amount of $1,000 or an integral multiple
thereof.

                  (c) The Change of Control provisions described above shall be
applicable whether or not any other provisions of this Indenture are applicable.
The Company shall comply, to the extent applicable, with the requirements of
Section 14(e) of the Exchange Act and any other securities laws or regulations
applicable to any Change of Control Offer. To the extent that the provisions of
any such securities laws or securities regulations conflict with the provisions
of this Section, the Company shall comply with the applicable securities laws
and regulations and shall not be deemed to have breached its obligations under
this Section by virtue thereof.

SECTION 4.16      LIMITATION ON SALE AND LEASEBACK TRANSACTIONS.

                  The Company shall not, and shall not permit any of its
Restricted Subsidiaries to, enter into any sale and leaseback transaction;
provided that the Company or any of its Restricted Subsidiaries may enter into a
sale and leaseback transaction if (i) the Company or such Restricted Subsidiary,
as applicable, could have (a) incurred Indebtedness in an amount equal to the
Attributable Debt relating to such sale and leaseback transaction pursuant to
the Debt to Consolidated Cash Flow Ratio test set forth in the first paragraph
of Section 4.09 hereof and (b) incurred a Lien to secure such Indebtedness
pursuant to Section 4.12 hereof, (ii) the gross cash proceeds of such sale and
leaseback transaction are at least equal to the Fair Market Value of the
property that is the subject of such sale and leaseback transaction and (iii)
the transfer of assets in such sale and leaseback transaction is permitted by,
and the Company applies the proceeds of such transaction in compliance with,
Section 4.10 hereof.

SECTION 4.17      LIMITATION ON ISSUANCES AND SALES OF EQUITY INTERESTS OF 
RESTRICTED SUBSIDIARIES.

                  The Company (i) shall not, and shall not permit any Restricted
Subsidiary of the Company to, transfer, convey, sell, lease or otherwise dispose
of any Equity Interests in any Restricted Subsidiary of the Company to any
Person (other than the Company or a Wholly Owned Restricted Subsidiary of the
Company) and (ii) shall not permit any Restricted Subsidiary of the Company to
issue any of its Equity Interests (other than, if necessary, shares of its
Capital Stock constituting directors' qualifying shares) to any Person other
than to the Company or a Wholly Owned Restricted Subsidiary of the Company,
unless, in each such case: (a) as a result of such transfer, conveyance, sale,
lease or other disposition or issuance such Restricted Subsidiary no longer
constitutes a Subsidiary and (b) the Net Proceeds from such transfer,
conveyance, sale, lease or other disposition or issuance are applied in
accordance with Section 4.10 hereof.

SECTION 4.18      LIMITATION ON ISSUANCES OF GUARANTEES OF INDEBTEDNESS.

                  The Company shall not permit any Restricted Subsidiary,
directly or indirectly, to Guarantee or pledge any assets to secure the payment
of any other Indebtedness of the Company unless such Subsidiary simultaneously
executes and delivers a supplemental indenture to this Indenture (in
substantially the form attached as Exhibit F hereto) providing for the Guarantee
of the payment of the Notes by such Subsidiary, which Guarantee shall be senior
to or pari passu with such Subsidiary's


                                       55
<PAGE>   56
Guarantee of or pledge to secure such other Indebtedness. Notwithstanding the
foregoing, any such Guarantee by a Subsidiary of the Notes shall provide by its
terms that it shall be automatically and unconditionally released and discharged
upon any sale, exchange or transfer, to any Person other than a Subsidiary of
the Company, of all of the Company's Equity Interests in, or all or
substantially all the assets of, such Subsidiary, which sale, exchange or
transfer is made in compliance with the applicable provisions of this Indenture.
The form of such Guarantee is attached as Exhibit E hereto.

                                   ARTICLE 5.
                                   SUCCESSORS

SECTION 5.01      MERGER, CONSOLIDATION OR SALE OF ASSETS.

                  The Company shall not consolidate or merge with or into
(whether or not the Company is the surviving corporation), or sell, assign,
transfer, lease, convey or otherwise dispose of all or substantially all of its
properties or assets in one or more related transactions, to another
corporation, Person or entity unless (i) the Company is the surviving
corporation or the entity or the Person formed by or surviving any such
consolidation or merger (if other than the Company) or to which such sale,
assignment, transfer, lease, conveyance or other disposition shall have been
made is a corporation organized or existing under the laws of the United States,
any state thereof or the District of Columbia, (ii) the entity or Person formed
by or surviving any such consolidation or merger (if other than the Company) or
the entity or Person to which such sale, assignment, transfer, lease, conveyance
or other disposition shall have been made assumes all the obligations of the
Company under the Notes and this Indenture pursuant to a supplemental indenture
in a form reasonably satisfactory to the Trustee, (iii) immediately after such
transaction, no Default or Event of Default exists and (iv) except in the case
of a merger of the Company with or into a Wholly Owned Restricted Subsidiary of
the Company and except in the case of a merger entered into solely for the
purpose of reincorporating the Company in another jurisdiction, the Company or
the entity or Person formed by or surviving any such consolidation or merger (if
other than the Company), or to which such sale, assignment, transfer, lease,
conveyance or other disposition shall have been made (A) shall, immediately
after giving pro forma effect to such transaction, have a Consolidated Net Worth
equal to or greater than the Consolidated Net Worth of the Company immediately
prior to such transaction and (B) shall, at the time of such transaction and
after giving pro forma effect thereto as if such transaction had occurred at the
beginning of the applicable four-quarter period, be permitted to incur at least
$1.00 of additional Indebtedness pursuant to the Debt to Consolidated Cash Flow
Ratio test set forth in the first paragraph of Section 4.09 hereof.

SECTION 5.02      SUCCESSOR CORPORATION SUBSTITUTED.

                  Upon any consolidation or merger, or any sale, assignment,
transfer, lease, conveyance or other disposition of all or substantially all of
the assets of the Company in accordance with Section 5.01 hereof, the successor
corporation formed by such consolidation or into or with which the Company is
merged or to which such sale, assignment, transfer, lease, conveyance or other
disposition is made shall succeed to, and be substituted for (so that from and
after the date of such consolidation, merger, sale, lease, conveyance or other
disposition, the provisions of this Indenture referring to the "Company" shall
refer instead to the successor corporation and not to the Company), and may
exercise every right and power of the Company under this Indenture with the same
effect as if such successor Person had been named as the Company herein,
provided, however, that and the predecessor Company shall not be relieved from
the obligation to pay the principal of and interest on the Notes except in the
case of a sale of all of the Company's assets that meets the requirements of
Section 5.01 hereof.

                                   ARTICLE 6.


                                       56
<PAGE>   57
                              DEFAULTS AND REMEDIES

SECTION 6.01      EVENTS OF DEFAULT.

                  An "Event of Default" occurs if:

                  (a) the Company defaults in the payment of interest, or
Liquidated Damages, if any, on the Notes when due and payable as to any Interest
Payment Date falling on or prior to June 15, 2001;

                  (b) the Company defaults in the payment of interest or
Liquidated Damages, if any, on the Notes when due and payable as to any Interest
Payment Date falling after June 15, 2001 and any such failure continues for 30
days;

                  (c) the Company defaults in the payment of principal of or
premium, if any, on the Notes when the same becomes due and payable at maturity,
upon redemption (including in connection with an offer to purchase) or
otherwise;

                  (d) the Company or any of its Subsidiaries fails to comply
with any of the provisions of Section 4.10, 4.15 or 5.01 hereof;

                  (e) the Company or any of its Subsidiaries fails to observe or
perform any other covenant, representation, warranty or other agreement in this
Indenture or the Notes for 30 days after notice to the Company by the Trustee or
the Holders of at least 25% in aggregate principal amount of the Notes then
outstanding voting as a single class;

                  (f) a default occurs under any mortgage, indenture or
instrument under which there may be issued or by which there may be secured or
evidenced any Indebtedness for money borrowed by the Company or any of its
Restricted Subsidiaries (or the payment of which is guaranteed by the Company or
any of its Restricted Subsidiaries), whether such Indebtedness or guarantee now
exists, or is created after the date of this Indenture, which default (a) is
caused by a failure to pay principal of or premium, if any, or interest on such
Indebtedness prior to the expiration of the grace period provided in such
Indebtedness on the date of such default (a "Payment Default") or (b) results in
the acceleration of such Indebtedness prior to its express maturity and, in each
case, the principal amount of any such Indebtedness, together with the principal
amount of any other such Indebtedness under which there has been a Payment
Default or the maturity of which has been so accelerated, aggregates $5,000,000
more;

                  (g) a final judgment or final judgments for the payment of
money are entered by a court or courts of competent jurisdiction against the
Company or any of its Restricted Subsidiaries and such judgment or judgments
remain unpaid or undischarged for a period (during which execution shall not be
effectively stayed) of 60 days, provided that the aggregate of all such unpaid
or undischarged judgments exceeds $5,000,000;

                  (h) the Company asserts in writing that the Pledge Agreement
ceases to be in full force and effect before payment in full of the obligations
thereunder or the Collateral (as defined in the Pledge Agreement) becomes
subject to any Lien other than the Lien under the Pledge Agreement;

                  (i) the Company or any of its Restricted Subsidiaries pursuant
to or within the meaning of Bankruptcy Law:

                  (i)      commences a voluntary case,


                                       57
<PAGE>   58
                  (ii)     consents to the entry of an order for relief against
         it in an involuntary case,

                  (iii)    consents to the appointment of a custodian of it or
         for all or substantially all of its property,

                  (iv)     makes a general assignment for the benefit of its
         creditors, or

                  (v)      generally is not paying its debts as they become due;

                  (j)      a court of competent jurisdiction enters an order or 
decree under any Bankruptcy Law that:

                  (i)      is for relief against the Company or any Restricted 
         Subsidiary in an involuntary case;

                  (ii) appoints a custodian of the Company or any Restricted
         Subsidiary or for all or substantially all of the property of the
         Company or any Restricted Subsidiary; or

                  (iii) orders the liquidation of the Company or any Restricted
         Subsidiary;

and the order or decree remains unstayed and in effect for 60 consecutive days;
or

                  (k) except as permitted herein, any Guarantee shall be held in
any judicial proceeding to be unenforceable or invalid or shall cease for any
reason to be in full force and effect or any Guarantor, or any Person acting on
behalf of any Guarantor, shall deny or disaffirm its obligations under its
Guarantee (other than by reason of the termination of this Indenture or the
release of any such Guarantee in accordance with this Indenture).

SECTION 6.02      ACCELERATION.

                  If any Event of Default (other than an Event of Default
specified in clause (i) or (j) of Section 6.01 hereof with respect to the
Company or any Restricted Subsidiary) occurs and is continuing, the Trustee or
the Holders of at least 25% in principal amount of the then outstanding Notes
may declare all the Notes to be due and payable immediately. Upon any such
declaration, the principal of, if any, and accrued and unpaid interest and
Liquidated Damages, if any, shall become due and payable immediately.
Notwithstanding the foregoing, if an Event of Default specified in clause (i) or
(j) of Section 6.01 hereof occurs with respect to the Company or any Restricted
Subsidiary, all outstanding Notes shall be due and payable immediately without
further action or notice. The Holders of a majority in aggregate principal
amount of the then outstanding Notes by written notice to the Trustee may on
behalf of all of the Holders rescind an acceleration and its consequences if the
rescission would not conflict with any judgment or decree and if all existing
Events of Default (except nonpayment of principal, interest or premium that has
become due solely because of the acceleration) have been cured or waived.

                  In the case of any Event of Default occurring by reason of any
willful action (or inaction) taken (or not taken) by or on behalf of the Company
with the intention of avoiding payment of the premium that the Company would
have had to pay if the Company then had elected to redeem the Notes pursuant to
the provisions of Section 3.07 hereof, an equivalent premium shall also become
due and payable immediately to the extent permitted by law upon the acceleration
of the Notes. If an Event of Default occurs prior to, June 15, 2003 by reason of
any willful action (or inaction) taken (or not taken)


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<PAGE>   59
by or on behalf of the Company with the intention of avoiding the prohibition on
redemption of the Notes prior to, June 15, 2003, then the premium specified in
Section 3.07 hereof shall also become due and payable immediately to the extent
permitted by law upon the acceleration of the Notes.

SECTION 6.03      OTHER REMEDIES.

                  If an Event of Default occurs and is continuing, the Trustee
may pursue any available remedy to collect the payment of principal, premium, if
any, interest and Liquidated Damages, if any, on the Notes or to enforce the
performance of any provision of the Notes or this Indenture.

                  The Trustee may maintain a proceeding even if it does not
possess any of the Notes or does not produce any of them in the proceeding. A
delay or omission by the Trustee or any Holder of a Note in exercising any right
or remedy accruing upon an Event of Default shall not impair the right or remedy
or constitute a waiver of or acquiescence in the Event of Default. All remedies
are cumulative to the extent permitted by law.

SECTION 6.04      WAIVER OF PAST DEFAULTS.

                  Holders of not less than a majority in aggregate principal
amount of the then outstanding Notes by notice to the Trustee may on behalf of
the Holders of all of the Notes waive any existing Default or Event of Default
and its consequences hereunder, except a continuing Default or Event of Default
in the payment of the principal of, premium and Liquidated Damages, if any, or
interest on, the Notes (including in connection with an offer to purchase)
(provided, however, that the Holders of a majority in aggregate principal amount
of the then outstanding Notes may rescind an acceleration and its consequences,
including any related payment default that resulted from such acceleration).
Upon any such waiver, such Default shall cease to exist, and any Event of
Default arising therefrom shall be deemed to have been cured for every purpose
of this Indenture; but no such waiver shall extend to any subsequent or other
Default or impair any right consequent thereon.

SECTION 6.05      CONTROL BY MAJORITY.

                  Holders of a majority in principal amount of the then
outstanding Notes may direct the time, method and place of conducting any
proceeding for exercising any remedy available to the Trustee or exercising any
trust or power conferred on it. However, the Trustee may refuse to follow any
direction that conflicts with law or this Indenture that the Trustee determines
may be unduly prejudicial to the rights of other Holders of Notes or that may
involve the Trustee in personal liability.

SECTION 6.06      LIMITATION ON SUITS.

                  A Holder of a Note may pursue a remedy with respect to this
Indenture or the Notes only if:

                  (a) the Holder of a Note gives to the Trustee written notice 
of a continuing Event of Default;

                  (b) the Holders of at least 25% in principal amount of the
then outstanding Notes make a written request to the Trustee to pursue the
remedy;

                  (c) such Holder of a Note or Holders of Notes offer and, if
requested, provide to the


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<PAGE>   60
Trustee indemnity satisfactory to the Trustee against any loss, liability or
expense;

                  (d) the Trustee does not comply with the request within 60
days after receipt of the request and the offer and, if requested, the provision
of indemnity; and

                  (e) during such 60-day period the Holders of a majority in
principal amount of the then outstanding Notes do not give the Trustee a
direction inconsistent with the request.

                  A Holder of a Note may not use this Indenture to prejudice the
rights of another Holder of a Note or to obtain a preference or priority over
another Holder of a Note.

SECTION 6.07      RIGHTS OF HOLDERS OF NOTES TO RECEIVE PAYMENT.

                  Notwithstanding any other provision of this Indenture, the
right of any Holder of a Note to receive payment of principal, premium and
Liquidated Damages, if any, and interest on the Note, on or after the respective
due dates expressed in the Note (including in connection with an offer to
purchase), or to bring suit for the enforcement of any such payment on or after
such respective dates, shall not be impaired or affected without the consent of
such Holder.

SECTION 6.08      COLLECTION SUIT BY TRUSTEE.

                  If an Event of Default specified in Section 6.01(a) or (b)
hereof occurs and is continuing, the Trustee is authorized to recover judgment
in its own name and as trustee of an express trust against the Company for the
whole amount of principal of, premium and Liquidated Damages, if any, and
interest remaining unpaid on the Notes and interest on overdue principal and, to
the extent lawful, interest and such further amount as shall be sufficient to
cover the costs and expenses of collection, including the reasonable
compensation, expenses, disbursements and advances of the Trustee, its agents
and counsel.

SECTION 6.09      TRUSTEE MAY FILE PROOFS OF CLAIM.

                  The Trustee is authorized to file such proofs of claim and
other papers or documents as may be necessary or advisable in order to have the
claims of the Trustee (including any claim for the reasonable compensation,
expenses, disbursements and advances of the Trustee, its agents and counsel) and
the Holders of the Notes allowed in any judicial proceedings relative to the
Company (or any other obligor upon the Notes), its creditors or its property and
shall be entitled and empowered to collect, receive and distribute any money or
other property payable or deliverable on any such claims and any custodian in
any such judicial proceeding is hereby authorized by each Holder to make such
payments to the Trustee, and in the event that the Trustee shall consent to the
making of such payments directly to the Holders, to pay to the Trustee any
amount due to it for the reasonable compensation, expenses, disbursements and
advances of the Trustee, its agents and counsel, and any other amounts due the
Trustee under Section 7.07 hereof. To the extent that the payment of any such
compensation, expenses, disbursements and advances of the Trustee, its agents
and counsel, and any other amounts due the Trustee under Section 7.07 hereof out
of the estate in any such proceeding, shall be denied for any reason, payment of
the same shall be secured by a Lien on, and shall be paid out of, any and all
distributions, dividends, money, securities and other properties that the
Holders may be entitled to receive in such proceeding whether in liquidation or
under any plan of reorganization or arrangement or otherwise. Nothing herein
contained shall be deemed to authorize the Trustee to authorize or consent to or
accept or adopt on behalf of any Holder any plan of reorganization, arrangement,
adjustment or 


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<PAGE>   61
composition affecting the Notes or the rights of any Holder, or to authorize the
Trustee to vote in respect of the claim of any Holder in any such proceeding.

SECTION 6.10      PRIORITIES.

                  If the Trustee collects any money pursuant to this Article, it
shall pay out the money in the following order:

                  First: to the Trustee, its agents and attorneys for amounts
due under Section 7.07 hereof, including payment of all compensation, expense
and liabilities incurred, and all advances made, by the Trustee and the costs
and expenses of collection;

                  Second: to Holders of Notes for amounts due and unpaid on the
Notes for principal, premium and Liquidated Damages, if any, and interest,
ratably, without preference or priority of any kind, according to the amounts
due and payable on the Notes for principal, premium and Liquidated Damages, if
any and interest, respectively; and

                  Third: to the Company or to such party as a court of competent
jurisdiction shall direct.

                  The Trustee may fix a record date and payment date for any
payment to Holders of Notes pursuant to this Section 6.10.

SECTION 6.11      UNDERTAKING FOR COSTS.

                  In any suit for the enforcement of any right or remedy under
this Indenture or in any suit against the Trustee for any action taken or
omitted by it as a Trustee, a court in its discretion may require the filing by
any party litigant in the suit of an undertaking to pay the costs of the suit,
and the court in its discretion may assess reasonable costs, including
reasonable attorneys' fees, against any party litigant in the suit, having due
regard to the merits and good faith of the claims or defenses made by the party
litigant. This Section does not apply to a suit by the Trustee, a suit by a
Holder of a Note pursuant to Section 6.07 hereof, or a suit by Holders of more
than 10% in principal amount of the then outstanding Notes.

                                   ARTICLE 7.
                                     TRUSTEE

SECTION 7.01      DUTIES OF TRUSTEE.

                  (a) If an Event of Default has occurred and is continuing, the
Trustee shall exercise such of the rights and powers vested in it by this
Indenture, and use the same degree of care and skill in its exercise, as a
prudent man would exercise or use under the circumstances in the conduct of his
own affairs.

                  (b) Except during the continuance of an Event of Default:

                  (i) the duties of the Trustee shall be determined solely by
         the express provisions of this Indenture and the Trustee need perform
         only those duties that are specifically set forth in this Indenture and
         no others, and no implied covenants or obligations shall be read into
         this Indenture against the Trustee; and


                                       61
<PAGE>   62
                  (ii) in the absence of bad faith on its part, the Trustee may
         conclusively rely, as to the truth of the statements and the
         correctness of the opinions expressed therein, upon certificates or
         opinions furnished to the Trustee and conforming to the requirements of
         this Indenture. However, the Trustee shall examine the certificates and
         opinions to determine whether or not they conform to the requirements
         of this Indenture.

                  (c) The Trustee may not be relieved from liabilities for its
own negligent action, its own negligent failure to act, or its own willful
misconduct, except that:

                  (i) this paragraph does not limit the effect of paragraph (b)
         of this Section;

                  (ii) the Trustee shall not be liable for any error of judgment
         made in good faith by a Responsible Officer, unless it is proved that
         the Trustee was negligent in ascertaining the pertinent facts; and

                  (iii) the Trustee shall not be liable with respect to any
         action it takes or omits to take in good faith in accordance with a
         direction received by it pursuant to Section 6.05 hereof.

                  (d) Whether or not therein expressly so provided, every
provision of this Indenture that in any way relates to the Trustee is subject to
paragraphs (a), (b), and (c) of this Section.

                  (e) No provision of this Indenture shall require the Trustee
to expend or risk its own funds or incur any liability. The Trustee shall be
under no obligation to exercise any of its rights and powers under this
Indenture at the request of any Holders, unless such Holder shall have offered
to the Trustee security and indemnity satisfactory to it against any loss,
liability or expense.

                  (f) The Trustee shall not be liable for interest on any money
received by it except as the Trustee may agree in writing with the Company.
Money held in trust by the Trustee need not be segregated from other funds
except to the extent required by law.

SECTION 7.02      RIGHTS OF TRUSTEE.

                  (a) The Trustee may conclusively rely upon any document
believed by it to be genuine and to have been signed or presented by the proper
Person. The Trustee need not investigate any fact or matter stated in the
document.

                  (b) Before the Trustee acts or refrains from acting, it may
require an Officers' Certificate or an Opinion of Counsel or both. The Trustee
shall not be liable for any action it takes or omits to take in good faith in
reliance on such Officers' Certificate or Opinion of Counsel. The Trustee may
consult with counsel and the written advice of such counsel or any Opinion of
Counsel shall be full and complete authorization and protection from liability
in respect of any action taken, suffered or omitted by it hereunder in good
faith and in reliance thereon.

                  (c) The Trustee may act through its attorneys and agents and
shall not be responsible for the misconduct or negligence of any agent appointed
with due care.

                  (d) The Trustee shall not be liable for any action it takes or
omits to take in good faith that it believes to be authorized or within the
rights or powers conferred upon it by this Indenture.

                  (e) Unless otherwise specifically provided in this Indenture,
any demand, request, 


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<PAGE>   63
direction or notice from the Company shall be sufficient if signed by an Officer
of the Company.

                  (f) The Trustee shall be under no obligation to exercise any
of the rights or powers vested in it by this Indenture at the request or
direction of any of the Holders unless such Holders shall have offered to the
Trustee reasonable security or indemnity against the costs, expenses and
liabilities that might be incurred by it in compliance with such request or
direction.

SECTION 7.03      INDIVIDUAL RIGHTS OF TRUSTEE.

                  The Trustee in its individual or any other capacity may become
the owner or pledgee of Notes and may otherwise deal with the Company or any
Affiliate of the Company with the same rights it would have if it were not
Trustee. However, in the event that the Trustee acquires any conflicting
interest it must eliminate such conflict within 90 days, apply to the SEC for
permission to continue as trustee or resign. Any Agent may do the same with like
rights and duties. The Trustee is also subject to Sections 7.10 and 7.11 hereof.

SECTION 7.04      TRUSTEE'S DISCLAIMER.

                  The Trustee shall not be responsible for and makes no
representation as to the validity or adequacy of this Indenture or the Notes, it
shall not be accountable for the Company's use of the proceeds from the Notes or
any money paid to the Company or upon the Company's direction under any
provision of this Indenture, it shall not be responsible for the use or
application of any money received by any Paying Agent other than the Trustee,
and it shall not be responsible for any statement or recital herein or any
statement in the Notes or any other document in connection with the sale of the
Notes or pursuant to this Indenture other than its certificate of
authentication.

SECTION 7.05      NOTICE OF DEFAULTS.

                  If a Default or Event of Default occurs and is continuing and
if it is known to the Trustee, the Trustee shall mail to Holders of Notes a
notice of the Default or Event of Default within 90 days after it occurs. Except
in the case of a Default or Event of Default in payment of principal of,
premium, if any, or interest on any Note, the Trustee may withhold the notice if
and so long as a committee of its Responsible Officers in good faith determines
that withholding the notice is not opposed to the interests of the Holders of
the Notes.

SECTION 7.06      REPORTS BY TRUSTEE TO HOLDERS OF THE NOTES.

                  Within 60 days after each June 15 beginning with the June 15
following the date of this Indenture, and for so long as any Notes remain
outstanding, the Trustee shall mail to the Holders of the Notes a brief report
dated as of such reporting date that complies with TIA Section 313(a) (but if no
event described in TIA Section 313(a) has occurred within the twelve months
preceding the reporting date, no report need be transmitted). The Trustee also
shall comply with TIA Section 313(b)(2). The Trustee shall also transmit by mail
all reports as required by TIA Section 313(c).

                  A copy of each report at the time of its mailing to the
Holders of Notes shall be mailed to the Company and filed with the SEC and each
stock exchange on which the Notes are listed in accordance with TIA Section
313(d). The Company shall promptly notify the Trustee when the Notes are listed
on any stock exchange.

SECTION 7.07      COMPENSATION AND INDEMNITY.


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<PAGE>   64
                  The Company shall pay to the Trustee from time to time
reasonable compensation for its acceptance of this Indenture and services
hereunder. The Trustee's compensation shall not be limited by any law on
compensation of a trustee of an express trust. The Company shall reimburse the
Trustee promptly upon request for all reasonable disbursements, advances and
expenses incurred or made by it in addition to the compensation for its
services. Such expenses shall include the reasonable compensation, disbursements
and expenses of the Trustee's agents and counsel.

                  The Company shall indemnify the Trustee against any and all
losses, liabilities or expenses incurred by it arising out of or in connection
with the acceptance or administration of its duties under this Indenture,
including the costs and expenses of enforcing this Indenture against the Company
(including this Section 7.07) and defending itself against any claim (whether
asserted by the Company or any Holder or any other person) or liability in
connection with the exercise or performance of any of its powers or duties
hereunder, except to the extent any such loss, liability or expense may be
attributable to its negligence or bad faith. The Trustee shall notify the
Company promptly of any claim for which it may seek indemnity. Failure by the
Trustee to so notify the Company shall not relieve the Company of its
obligations hereunder. The Company shall defend the claim and the Trustee shall
cooperate in the defense. The Trustee may have separate counsel and the Company
shall pay the reasonable fees and expenses of such counsel. The Company need not
pay for any settlement made without its consent, which consent shall not be
unreasonably withheld.

                  The obligations of the Company under this Section 7.07 shall
survive the satisfaction and discharge of this Indenture.

                  To secure the Company's payment obligations in this Section,
the Trustee shall have a Lien prior to the Notes on all money or property held
or collected by the Trustee, except that held in trust to pay principal and
interest on particular Notes. Such Lien shall survive the satisfaction and
discharge of this Indenture.

                  When the Trustee incurs expenses or renders services after an
Event of Default specified in Section 6.01(i) or (j) hereof occurs, the expenses
and the compensation for the services (including the fees and expenses of its
agents and counsel) are intended to constitute expenses of administration under
any Bankruptcy Law.

                  The Trustee shall comply with the provisions of TIA Section
313(b)(2) to the extent applicable.

SECTION 7.08      REPLACEMENT OF TRUSTEE.

                  A resignation or removal of the Trustee and appointment of a
successor Trustee shall become effective only upon the successor Trustee's
acceptance of appointment as provided in this Section.

                  The Trustee may resign in writing at any time and be
discharged from the trust hereby created by so notifying the Company. The
Holders of Notes of a majority in principal amount of the then outstanding Notes
may remove the Trustee by so notifying the Trustee and the Company in writing.
The Company may remove the Trustee if:

                  (a) the Trustee fails to comply with Section 7.10 hereof;

                  (b) the Trustee is adjudged a bankrupt or an insolvent or an
         order for relief is entered with respect to the Trustee under any
         Bankruptcy Law;


                                       64
<PAGE>   65
                  (c) a custodian or public officer takes charge of the Trustee
        or its property; or

                  (d) the Trustee becomes incapable of acting.

                  If the Trustee resigns or is removed or if a vacancy exists in
the office of Trustee for any reason, the Company shall promptly appoint a
successor Trustee. Within one year after the successor Trustee takes office, the
Holders of a majority in principal amount of the then outstanding Notes may
appoint a successor Trustee to replace the successor Trustee appointed by the
Company.

                  If a successor Trustee does not take office within 60 days
after the retiring Trustee resigns or is removed, the retiring Trustee, the
Company, or the Holders of Notes of at least 10% in principal amount of the then
outstanding Notes may petition any court of competent jurisdiction for the
appointment of a successor Trustee.

                  If the Trustee, after written request by any Holder of a Note
who has been a Holder of a Note for at least six months, fails to comply with
Section 7.10 hereof, such Holder of a Note may petition any court of competent
jurisdiction for the removal of the Trustee and the appointment of a successor
Trustee.

                  A successor Trustee shall deliver a written acceptance of its
appointment to the retiring Trustee and to the Company. Thereupon, the
resignation or removal of the retiring Trustee shall become effective, and the
successor Trustee shall have all the rights, powers and duties of the Trustee
under this Indenture. The successor Trustee shall mail a notice of its
succession to Holders of the Notes. The retiring Trustee shall promptly transfer
all property held by it as Trustee to the successor Trustee, provided all sums
owing to the Trustee hereunder have been paid and subject to the Lien provided
for in Section 7.07 hereof. Notwithstanding replacement of the Trustee pursuant
to this Section 7.08, the Company's obligations under Section 7.07 hereof shall
continue for the benefit of the retiring Trustee.

SECTION 7.09      SUCCESSOR TRUSTEE BY MERGER, ETC.

                  If the Trustee consolidates, merges or converts into, or
transfers all or substantially all of its corporate trust business to, another
corporation, the successor corporation without any further act shall be the
successor Trustee.

SECTION 7.10      ELIGIBILITY; DISQUALIFICATION.

                  There shall at all times be a Trustee hereunder that is a
corporation organized and doing business under the laws of the United States of
America or of any state thereof that is authorized under such laws to exercise
corporate trustee power, that is subject to supervision or examination by
federal or state authorities and that has a combined capital and surplus of at
least $50,000,000 as set forth in its most recent published annual report of
condition.

                  This Indenture shall always have a Trustee who satisfies the
requirements of TIA Section 310(a)(1), (2) and (5). The Trustee is subject to
TIA Section 310(b).

SECTION 7.11      PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY.

                  The Trustee is subject to TIA Section 311(a), excluding any
creditor relationship listed in TIA Section 311(b). A Trustee who has resigned
or been removed shall be subject to TIA Section 311(a) to the extent indicated
therein.


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<PAGE>   66
                                   ARTICLE 8.
                    LEGAL DEFEASANCE AND COVENANT DEFEASANCE

SECTION 8.01      OPTION TO EFFECT LEGAL DEFEASANCE OR COVENANT DEFEASANCE.

                  When (i) the Company delivers to the Trustee all outstanding
Notes (other than Notes replaced pursuant to Section 2.07 hereof) for
cancellation or (ii) all outstanding Notes have become due and payable, whether
at maturity or as a result of the mailing of a notice of redemption pursuant to
Article 3 hereof and the Company irrevocably deposits with the Trustee funds
sufficient to pay at maturity or upon redemption all outstanding Notes,
including interest thereon to maturity or such redemption date (other than Notes
replaced pursuant to Section 2.07 hereof), and if in either case the Company
pays all other sums payable hereunder by the Company, then this Indenture shall,
subject to the proviso set forth in Section 8.02 hereof, cease to be of further
effect. The Company may, at the option of its Board of Directors evidenced by a
resolution set forth in an Officers' Certificate, at any time, elect to have
either Section 8.02 or 8.03 hereof applied to all outstanding Notes upon
compliance with the conditions set forth below in this Article Eight.

SECTION 8.02      LEGAL DEFEASANCE AND DISCHARGE.

                  Upon the Company's exercise under Section 8.01 hereof of the
option applicable to this Section 8.02, the Company shall, subject to the
satisfaction of the conditions set forth in Section 8.04 hereof, be deemed to
have been discharged from its obligations with respect to all outstanding Notes
on the date the conditions set forth below are satisfied (hereinafter, "Legal
Defeasance"). For this purpose, Legal Defeasance means that the Company shall be
deemed to have paid and discharged the entire Indebtedness represented by the
outstanding Notes, which shall thereafter be deemed to be "outstanding" only for
the purposes of Section 8.05 hereof and the other Sections of this Indenture
referred to in (a) and (b) below, and to have satisfied all its other
obligations under such Notes and this Indenture (and the Trustee, on demand of
and at the expense of the Company, shall execute proper instruments
acknowledging the same); provided that the following provisions which shall
survive until otherwise terminated or discharged hereunder: (a) the rights of
Holders of outstanding Notes to receive solely from the trust fund described in
Section 8.04 hereof, and as more fully set forth in such Section, payments in
respect of the principal of, premium, if any, and interest and Liquidated
Damages on such Notes when such payments are due, (b) the Company's obligations
with respect to such Notes under Article 2 and Section 4.02 hereof, (c) the
rights, powers, trusts, duties and immunities of the Trustee hereunder and the
Company's obligations in connection therewith and (d) this Article Eight.
Subject to compliance with this Article Eight, the Company may exercise its
option under this Section 8.02 notwithstanding the prior exercise of its option
under Section 8.03 hereof.

SECTION 8.03      COVENANT DEFEASANCE.

                  Upon the Company's exercise under Section 8.01 hereof of the
option applicable to this Section 8.03, the Company shall, subject to the
satisfaction of the conditions set forth in Section 8.04 hereof, be released
from its obligations under the covenants contained in Sections 4.03, 4.04, 4.05,
4.07, 4.08, 4.09, 4.10, 4.11, 4.12, 4.13, 4.15, 4.16, 4.17, 4.18 hereof and
Article 5 hereof, with respect to the outstanding Notes on and after the date
the conditions set forth in Section 8.04 hereof are satisfied (hereinafter,
"Covenant Defeasance"), and the Notes shall thereafter be deemed not
"outstanding" for the purposes of any direction, waiver, consent or declaration
or act of Holders (and the consequences of any thereof) in connection with such
covenants, but shall continue to be deemed "outstanding" for all other purposes
hereunder (it being understood that such Notes shall not be deemed outstanding
for accounting purposes). For this purpose, Covenant Defeasance means that, with
respect to the outstanding Notes, the 


                                       66
<PAGE>   67
Company may omit to comply with and shall have no liability in respect of any
term, condition or limitation set forth in any such covenant, whether directly
or indirectly, by reason of any reference elsewhere herein to any such covenant
or by reason of any reference in any such covenant to any other provision herein
or in any other document and such omission to comply shall not constitute a
Default or an Event of Default under Section 6.01 hereof, but, except as
specified above, the remainder of this Indenture and such Notes shall be
unaffected thereby. In addition, upon the Company's exercise under Section 8.01
hereof of the option applicable to this Section 8.03 hereof, subject to the
satisfaction of the conditions set forth in Section 8.04 hereof, Sections
6.01(d) through 6.01(h) hereof and 6.01(k) hereof shall not constitute Events of
Default.

SECTION 8.04      CONDITIONS TO LEGAL OR COVENANT DEFEASANCE.

                  The following shall be the conditions to the application of
either Section 8.02 or 8.03 hereof to the outstanding Notes:

         In order to exercise either Legal Defeasance or Covenant Defeasance:

                  (a) the Company must irrevocably deposit with the Trustee, in
         trust, for the benefit of the Holders, cash in United States dollars,
         non-callable U.S. Government Obligations, or a combination thereof, in
         such amounts as will be sufficient, in the opinion of a nationally
         recognized firm of independent public accountants, to pay the principal
         of, premium, if any, and interest and Liquidated Damages on the
         outstanding Notes on the stated maturity or on the applicable
         redemption date, as the case may be, and the Company must specify
         whether the Notes are being defeased to maturity or to a particular
         redemption date;

                  (b) in the case of an election under Section 8.02 hereof, the
         Company shall have delivered to the Trustee an Opinion of Counsel in
         the United States reasonably acceptable to the Trustee confirming that
         (A) the Company has received from, or there has been published by, the
         Internal Revenue Service a ruling or (B) since the date of this
         Indenture, there has been a change in the applicable federal income tax
         law, in either case to the effect that, and based thereon such Opinion
         of Counsel shall confirm that, the Holders of the outstanding Notes
         will not recognize income, gain or loss for federal income tax purposes
         as a result of such Legal Defeasance and will be subject to federal
         income tax on the same amounts, in the same manner and at the same
         times as would have been the case if such Legal Defeasance had not
         occurred;

                  (c) in the case of an election under Section 8.03 hereof, the
         Company shall have delivered to the Trustee an Opinion of Counsel in
         the United States reasonably acceptable to the Trustee confirming that
         the Holders of the outstanding Notes will not recognize income, gain or
         loss for federal income tax purposes as a result of such Covenant
         Defeasance and will be subject to federal income tax on the same
         amounts, in the same manner and at the same times as would have been
         the case if such Covenant Defeasance had not occurred;

                  (d) no Default or Event of Default shall have occurred and be
         continuing on the date of such deposit (other than a Default or Event
         of Default resulting from the incurrence of Indebtedness all or a
         portion of the proceeds of which will be used to defease the Notes
         pursuant to this Article Eight concurrently with such incurrence) or
         insofar as Sections 6.01(i) or 6.01(j) hereof is concerned, at any time
         in the period ending on the 91st day after the date of deposit;


                                       67
<PAGE>   68
                  (e) such Legal Defeasance or Covenant Defeasance shall not
         result in a breach or violation of, or constitute a default under, any
         material agreement or instrument (other than this Indenture) to which
         the Company or any of its Restricted Subsidiaries is a party or by
         which the Company or any of its Restricted Subsidiaries is bound;

                  (f) the Company shall have delivered to the Trustee an Opinion
         of Counsel (which may be subject to customary exceptions) to the effect
         that after the 91st day following the deposit, the trust funds will not
         be subject to the effect of any applicable bankruptcy, insolvency,
         reorganization or similar laws affecting creditors' rights generally;

                  (g) the Company shall have delivered to the Trustee an
         Officers' Certificate stating that the deposit was not made by the
         Company with the intent of preferring the Holders over any other
         creditors of the Company or with the intent of defeating, hindering,
         delaying or defrauding any other creditors of the Company; and

                  (h) the Company shall have delivered to the Trustee an
         Officers' Certificate and an Opinion of Counsel, each stating that all
         conditions precedent provided for or relating to the Legal Defeasance
         or the Covenant Defeasance have been complied with.

SECTION 8.05      DEPOSITED MONEY AND U.S. GOVERNMENT OBLIGATIONS TO BE HELD IN
TRUST; OTHER MISCELLANEOUS PROVISIONS.

                  Subject to Section 8.06 hereof, all money and U.S. Government
Obligations (including the proceeds thereof) deposited with the Trustee (or
other qualifying trustee, collectively for purposes of this Section 8.05, the
"Trustee") pursuant to Section 8.04 hereof in respect of the outstanding Notes
shall be held in trust and applied by the Trustee, in accordance with the
provisions of such Notes and this Indenture, to the payment, either directly or
through any Paying Agent (including the Company acting as Paying Agent) as the
Trustee may determine, to the Holders of such Notes of all sums due and to
become due thereon in respect of principal, premium, if any, interest and
Liquidated Damages, if any, but such money need not be segregated from other
funds except to the extent required by law.

                  The Company shall pay and indemnify the Trustee against any
tax, fee or other charge imposed on or assessed against the cash or U.S.
Government Obligations deposited pursuant to Section 8.04 hereof or the
principal and interest received in respect thereof other than any such tax, fee
or other charge which by law is for the account of the Holders of the
outstanding Notes.

                  Anything in this Article Eight to the contrary
notwithstanding, the Trustee shall deliver or pay to the Company from time to
time upon the request of the Company any money or U.S. Government Obligations
held by it as provided in Section 8.04 hereof which, in the opinion of a
nationally recognized firm of independent public accountants expressed in a
written certification thereof delivered to the Trustee (which may be the opinion
delivered under Section 8.04(a) hereof), are in excess of the amount thereof
that would then be required to be deposited to effect an equivalent Legal
Defeasance or Covenant Defeasance.

SECTION 8.06      REPAYMENT TO COMPANY.

                  Any money deposited with the Trustee or any Paying Agent, or
then held by the Company, in trust for the payment of the principal of, premium,
if any, or interest on any Note and remaining unclaimed for two years after such
principal, and premium, if any, or interest has become due 


                                       68
<PAGE>   69
and payable shall be paid to the Company on its request or (if then held by the
Company) shall be discharged from such trust; and the Holder of such Note shall
thereafter, as a secured creditor, look only to the Company for payment thereof,
and all liability of the Trustee or such Paying Agent with respect to such trust
money, and all liability of the Company as trustee thereof, shall thereupon
cease; provided, however, that the Trustee or such Paying Agent, before being
required to make any such repayment, may at the expense of the Company cause to
be published once, in the New York Times and The Wall Street Journal (national
edition), notice that such money remains unclaimed and that, after a date
specified therein, which shall not be less than 30 days from the date of such
notification or publication, any unclaimed balance of such money then remaining
will be repaid to the Company.

SECTION 8.07      REINSTATEMENT.

                  If the Trustee or Paying Agent is unable to apply any United
States dollars or U.S. Government Obligations in accordance with Section 8.02 or
8.03 hereof, as the case may be, by reason of any order or judgment of any court
or governmental authority enjoining, restraining or otherwise prohibiting such
application, then the Company's obligations under this Indenture and the Notes
shall be revived and reinstated as though no deposit had occurred pursuant to
Section 8.02 or 8.03 hereof until such time as the Trustee or Paying Agent is
permitted to apply all such money in accordance with Section 8.02 or 8.03
hereof, as the case may be; provided, however, that, if the Company makes any
payment of principal of, premium, if any, Liquidated Damages, if any, or
interest on any Note following the reinstatement of its obligations, the Company
shall be subrogated to the rights of the Holders of such Notes to receive such
payment from the money held by the Trustee or Paying Agent.

                                   ARTICLE 9.
                        AMENDMENT, SUPPLEMENT AND WAIVER

SECTION 9.01      WITHOUT CONSENT OF HOLDERS OF NOTES.

                  Notwithstanding Section 9.02 of this Indenture, the Company
and the Trustee may amend or supplement this Indenture or the Notes without the
consent of any Holder of a Note:

                  (a) to cure any ambiguity, defect or inconsistency;

                  (b) to provide for uncertificated Notes in addition to or in
         place of certificated Notes or to alter the provisions of Article 2
         hereof (including the related definitions) in a manner that does not
         materially adversely affect any Holder;

                  (c) to provide for the assumption of the Company's obligations
         to the Holders of the Notes by a successor to the Company pursuant to
         Article 5 hereof or to add any Person as a Guarantor hereunder;

                  (d) to make any change that would provide any additional
         rights or benefits to the Holders of the Notes or that does not
         adversely affect the legal rights hereunder of any Holder of the Note;
         and

                  (e) to comply with requirements of the SEC in order to effect
         or maintain the qualification of this Indenture under the TIA.

                  Upon the request of the Company accompanied by a resolution of
its Board of Directors authorizing the execution of any such amended or
supplemental Indenture, and upon receipt by the 


                                       69
<PAGE>   70
Trustee of the documents described in Section 7.02 hereof, the Trustee shall
join with the Company in the execution of any amended or supplemental Indenture
authorized or permitted by the terms of this Indenture and to make any further
appropriate agreements and stipulations that may be therein contained, but the
Trustee shall not be obligated to enter into such amended or supplemental
Indenture that affects its own rights, duties or immunities under this Indenture
or otherwise.

SECTION 9.02      WITH CONSENT OF HOLDERS OF NOTES.

                  Except as provided below in this Section 9.02, the Company and
the Trustee may amend or supplement this Indenture (including Section 3.09, 4.10
and 4.15 hereto) and the Notes may be amended or supplemented with the consent
of the Holders of at least a majority in principal amount of the Notes then
outstanding (including, without limitation, consents obtained in connection with
a tender offer or exchange offer for, or purchase of, the Notes), and, subject
to Sections 6.04 and 6.07 hereof, any existing Default or Event of Default
(other than a Default or Event of Default in the payment of the principal of,
premium, if any, or interest on the Notes, except a payment default resulting
from an acceleration that has been rescinded) or compliance with any provision
of this Indenture or the Notes may be waived with the consent of the Holders of
a majority in principal amount of the then outstanding Notes voting as a single
class (including, without limitation, consents obtained in connection with a
tender offer or exchange offer for, or purchase of, the Notes). Section 2.08
hereof shall determine which Notes are considered to be "outstanding" for
purposes of this Section 9.02.

                  Upon the request of the Company accompanied by a resolution of
its Board of Directors authorizing the execution of any such amended or
supplemental Indenture, and upon the filing with the Trustee of evidence
satisfactory to the Trustee of the consent of the Holders of Notes as aforesaid,
and upon receipt by the Trustee of the documents described in Section 7.02
hereof, the Trustee shall join with the Company in the execution of such amended
or supplemental Indenture unless such amended or supplemental Indenture directly
affects the Trustee's own rights, duties or immunities under this Indenture or
otherwise, in which case the Trustee may in its discretion, but shall not be
obligated to, enter into such amended or supplemental Indenture.

                  It shall not be necessary for the consent of the Holders of
Notes under this Section 9.02 to approve the particular form of any proposed
amendment or waiver, but it shall be sufficient if such consent approves the
substance thereof.

                  After an amendment, supplement or waiver under this Section
becomes effective, the Company shall mail to the Holders of Notes affected
thereby a notice briefly describing the amendment, supplement or waiver. Any
failure of the Company to mail such notice, or any defect therein, shall not,
however, in any way impair or affect the validity of any such amended or
supplemental Indenture or waiver. Subject to Sections 6.04 and 6.07 hereof, the
Holders of a majority in aggregate principal amount of the Notes then
outstanding voting as a single class may waive compliance in a particular
instance by the Company with any provision of this Indenture or the Notes.
However, without the consent of each Holder affected, an amendment or waiver
under this Section 9.02 may not (with respect to any Notes held by a
non-consenting Holder):

                  (a) reduce the principal amount of Notes whose Holders must
         consent to an amendment, supplement or waiver;

                  (b) reduce the principal of or change the fixed maturity of
         any Note or alter or waive the provisions with respect to the
         redemption of the Notes except as provided above with respect to


                                       70
<PAGE>   71
         Sections 3.09, 4.10 and 4.15 hereof;

                  (c) reduce the rate of or change the time for payment of
         interest, including default interest, on any Note;

                  (d) waive a Default or Event of Default in the payment of
         principal of or premium, if any, or interest on the Notes (except a
         rescission of acceleration of the Notes by the Holders of at least a
         majority in aggregate principal amount of the then outstanding Notes
         and a waiver of the payment default that resulted from such
         acceleration);

                  (e) make any Note payable in money other than that stated in
         the Notes;

                  (f) make any change in the provisions of this Indenture
         relating to waivers of past Defaults or the rights of Holders of Notes
         to receive payments of principal of, premium, if any, or interest on
         the Notes;

                  (g) except as provided under Article 8 hereof or in accordance
         with the terms of any Guarantee of the Notes by a Subsidiary of the
         Company, release a Guaranteeing Subsidiary from its obligations under
         its Guarantee of the Notes or make any change in a Guarantee of the
         Notes by a Subsidiary of the Company that would aversely affect the
         Holders of the Notes;

                  (h) modify the provisions of the Pledge Agreement or the
         Indenture relating to the Pledged Securities in any manner adverse to
         the Holders or release the Pledge Account from the Lien under the
         Pledge Agreement or permit any other obligation to be secured by the
         Pledge Agreement; or

                  (i) make any change in Section 6.04 or 6.07 hereof or in the
         foregoing amendment and waiver provisions.

SECTION 9.03      COMPLIANCE WITH TRUST INDENTURE ACT.

                  Every amendment or supplement to this Indenture or the Notes
shall be set forth in a amended or supplemental Indenture that complies with the
TIA as then in effect.

SECTION 9.04      REVOCATION AND EFFECT OF CONSENTS.

                  Until an amendment, supplement or waiver becomes effective, a
consent to it by a Holder of a Note is a continuing consent by the Holder of a
Note and every subsequent Holder of a Note or portion of a Note that evidences
the same debt as the consenting Holder's Note, even if notation of the consent
is not made on any Note. However, any such Holder of a Note or subsequent Holder
of a Note may revoke the consent as to its Note if the Trustee receives written
notice of revocation before the date the waiver, supplement or amendment becomes
effective. An amendment, supplement or waiver becomes effective in accordance
with its terms and thereafter binds every Holder.

SECTION 9.05      NOTATION ON OR EXCHANGE OF NOTES.

                  The Trustee may place an appropriate notation about an
amendment, supplement or waiver on any Note thereafter authenticated. The
Company in exchange for all Notes may issue and the Trustee shall, upon receipt
of an Authentication Order, authenticate new Notes that reflect the amendment,
supplement or waiver.


                                       71
<PAGE>   72
                  Failure to make the appropriate notation or issue a new Note
shall not affect the validity and effect of such amendment, supplement or
waiver.

SECTION 9.06      TRUSTEE TO SIGN AMENDMENTS, ETC.

                  The Trustee shall sign any amended or supplemental Indenture
authorized pursuant to this Article Nine if the amendment or supplement does not
adversely affect the rights, duties, liabilities or immunities of the Trustee.
The Company may not sign an amendment or supplemental Indenture until the Board
of Directors approves it. In executing any amended or supplemental indenture,
the Trustee shall be entitled to receive and (subject to Section 7.01 hereof)
shall be fully protected in relying upon, in addition to the documents required
by Section 10.04 hereof, an Officers' Certificate and an Opinion of Counsel
stating that the execution of such amended or supplemental indenture is
authorized or permitted by this Indenture.

                                   ARTICLE 10.
                                    SECURITY

SECTION 10.01.    SECURITY.

                  (a) On the date of this Indenture, the Company shall purchase,
and, at all times subject to the Pledge Agreement, shall maintain Pledged
Securities pledged to the Trustee as security for the benefit of the Holders in
such amount as will be sufficient upon receipt of scheduled interest and/or
principal payments of such Pledged Securities, in the opinion of a nationally
recognized firm of independent public accountants selected by the Company, to
provide for payment in full of the first six scheduled interest payments due on
the outstanding Notes. The Pledged Securities shall be pledged by the Company to
the Trustee for the benefit of the Holders and shall be held by the Trustee in
the Pledge Account pending disposition pursuant to the Pledge Agreement.

                  (b) Each Holder, by its acceptance of a Note, consents and
agrees to the terms of the Pledge Agreement (including, without limitation, the
provisions providing for foreclosure and release of the Pledged Securities) as
the same may be in effect or may be amended from time to time in accordance with
its terms, and authorizes and directs the Trustee to enter into the Pledge
Agreement and to perform its respective obligations and exercise its respective
rights thereunder in accordance therewith. The Company shall do or cause to be
done all such acts and things as may be necessary or proper, or as may be
required by the provisions of the Pledge Agreement, to assure and confirm to the
Trustee the security interest in the Pledged Securities contemplated hereby or
by the Pledge Agreement, or any part thereof as from time to time constituted,
so as to render the same available for the security and benefit of this
Indenture and of the Notes secured hereby, according to the intent and purposes
herein expressed. The Company shall take, or shall cause to be taken, any and
all actions reasonable required (and any action reasonably requested by the
Trustee) to cause the Pledge Agreement to create and maintain, as security for
the obligations of the Company under this Indenture and the Notes, valid and
enforceable first priority liens in and on all the Pledged Securities, in favor


                                       72
<PAGE>   73
of the Trustee, superior to and prior to the rights of third Persons and subject
to no other Liens.

                  (c) The release of any Pledged Securities pursuant to the
Pledge Agreement will not be deemed to impair the security under this Indenture
in contravention of the provisions hereof if and to the extent the Pledged
Securities are released pursuant to this Indenture and the Pledge Agreement. To
the extent applicable, the Company shall cause TIA Section 314(d) relating to
the release of property or securities from the Lien and security interest of the
Pledge Agreement (other than pursuant to Sections 6(c) and 6(e) thereof) and
relating to the substitution therefor of any property or securities to be
subjected to the Lien and security interest of the Pledge Agreement to be
complied with. Any certificate or opinion required by TIA Section 314(d) may be
made by an officer of the Company, except in cases where TIA Section 314(d)
requires that such certificate or opinion be made by an independent Person,
which Person shall be an independent engineer, appraiser or other expert
selected by the Company

                  (d) The Trustee, in its sole discretion and without the
consent of the Holders, may, and at the request of the Holders of at least 25%
in aggregate principal amount of Notes then outstanding shall, on behalf of the
Holders, take all actions it deems necessary or appropriate in order to (i)
enforce any of the terms of the Pledge Agreement and (ii) collect and receive
any and all amounts payable in respect of the obligations of the Company
thereunder. The Trustee shall have the power to institute and to maintain such
suits and proceedings as the Trustee in its sole discretion may deem expedient
to preserve or protect its interests and the interests of the Holders in the
Pledged Securities (including the power to institute and maintain suits or
proceedings to restrain the enforcement of or compliance with any legislative or
other governmental enactment, rule or order that may be unconstitutional or
otherwise invalid if the enforcement of, or compliance with, such enactment,
rule or order would impair the security interest hereunder or be prejudicial to
the interests of the Holders or of the Trustee).

                                   ARTICLE 11.
                                  MISCELLANEOUS

SECTION 11.01     TRUST INDENTURE ACT CONTROLS.

                  If any provision of this Indenture limits, qualifies or
conflicts with the duties imposed by TIA Section 318(c), the imposed duties
shall control.

SECTION 11.02     NOTICES.

                  Any notice or communication by the Company or the Trustee to
the others is duly given if in writing and delivered in Person or mailed by
first class mail (registered or certified, return receipt requested), telex,
telecopier or overnight air courier guaranteeing next day delivery, to the
others'


                                       73
<PAGE>   74
address

                  If to the Company:

                  Birch Telecom, Inc.
                  1004 Baltimore Avenue
                  Suite 900
                  Kansas City, MO  64105
                  Telecopier No.:  (816) 842-7507
                  Attention:  Chief Financial Officer

                  With a copy to:

                  Latham & Watkins
                  885 Third Avenue
                  Suite 1000
                  New York, NY  10022
                  Telecopier No.:  (212) 751-4864
                  Attention:  Kirk A. Davenport

                  If to the Trustee:

                  Norwest Bank Minnesota, National Association
                  Sixth and Marquette
                  Minneapolis, MN  55479-0069
                  Telecopier No.: (612) 667-9825
                  Attention: Jane Schweiger, Corporate Trust Department

                  The Company or the Trustee, by notice to the others may
designate additional or different addresses for subsequent notices or
communications.

                  All notices and communications (other than those sent to
Holders) shall be deemed to have been duly given: at the time delivered by hand,
if personally delivered; five Business Days after being deposited in the mail,
postage prepaid, if mailed; when answered back, if telexed; when receipt
acknowledged, if telecopied; and the next Business Day after timely delivery to
the courier, if sent by overnight air courier guaranteeing next day delivery.

                  Any notice or communication to a Holder shall be mailed by
first class mail, certified or registered, return receipt requested, or by
overnight air courier guaranteeing next day delivery to its address shown on the
register kept by the Registrar. Any notice or communication shall also be so
mailed to any Person described in TIA Section 313(c), to the extent required by
the TIA. Failure to mail a notice or communication to a Holder or any defect in
it shall not affect its sufficiency with respect to other Holders.

                  If a notice or communication is mailed in the manner provided
above within the time prescribed, it is duly given, whether or not the addressee
receives it.

                  If the Company mails a notice or communication to Holders, it
shall mail a copy to the Trustee and each Agent at the same time.


                                       74
<PAGE>   75
SECTION 11.03     COMMUNICATION BY HOLDERS OF NOTES WITH OTHER HOLDERS OF NOTES.

                  Holders may communicate pursuant to TIA Section 312(b) with
other Holders with respect to their rights under this Indenture or the Notes.
The Company, the Trustee, the Registrar and anyone else shall have the
protection of TIA Section 312(c).

SECTION 11.04     CERTIFICATE AND OPINION AS TO CONDITIONS PRECEDENT.

                  Upon any request or application by the Company to the Trustee
to take any action under this Indenture, the Company shall furnish to the
Trustee:

                  (a) an Officers' Certificate in form and substance reasonably
         satisfactory to the Trustee (which shall include the statements set
         forth in Section 11.05 hereof) stating that, in the opinion of the
         signers, all conditions precedent and covenants, if any, provided for
         in this Indenture relating to the proposed action have been satisfied;
         and

                  (b) an Opinion of Counsel in form and substance reasonably
         satisfactory to the Trustee (which shall include the statements set
         forth in Section 11.05 hereof) stating that, in the opinion of such
         counsel, all such conditions precedent and covenants have been
         satisfied.

SECTION 11.05     STATEMENTS REQUIRED IN CERTIFICATE OR OPINION.

                  Each certificate or opinion with respect to compliance with a
condition or covenant provided for in this Indenture (other than a certificate
provided pursuant to TIA Section 314(a)(4)) shall comply with the provisions of
TIA Section 314(e) and shall include:

                  (a) a statement that the Person making such certificate or 
         opinion has read such covenant or condition;

                  (b) a brief statement as to the nature and scope of the
         examination or investigation upon which the statements or opinions
         contained in such certificate or opinion are based;

                  (c) a statement that, in the opinion of such Person, he or she
         has made such examination or investigation as is necessary to enable
         such Person to express an informed opinion as to whether or not such
         covenant or condition has been satisfied; and

                  (d) a statement as to whether or not, in the opinion of such
         Person, such condition or covenant has been satisfied.

SECTION 11.06     RULES BY TRUSTEE AND AGENTS.

                  The Trustee may make reasonable rules for action by or at a
meeting of Holders. The Registrar or Paying Agent may make reasonable rules and
set reasonable requirements for its functions.

SECTION 11.07     NO PERSONAL LIABILITY OF DIRECTORS, OFFICERS, EMPLOYEES AND 
                  STOCKHOLDERS.

                  No past, present or future director, officer, employee,
incorporator or stockholder of the Company, as such, shall have any liability
for any obligations of the Company under the Notes, this Indenture or for any
claim based on, in respect of, or by reason of, such obligations or their
creation. Each Holder by accepting a Note waives and releases all such
liability. The waiver and release are part 


                                       75
<PAGE>   76
of the consideration for issuance of the Notes.

SECTION 11.08     GOVERNING LAW.

                  THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE
USED TO CONSTRUE THIS INDENTURE AND THE NOTES.

SECTION 11.09     NO ADVERSE INTERPRETATION OF OTHER AGREEMENTS.

                  This Indenture may not be used to interpret any other
indenture, loan or debt agreement of the Company or its Subsidiaries or of any
other Person. Any such indenture, loan or debt agreement may not be used to
interpret this Indenture.

SECTION 11.10     SUCCESSORS.

                  All agreements of the Company in this Indenture and the Notes
shall bind its successors. All agreements of the Trustee in this Indenture shall
bind its successors.

SECTION 11.11     SEVERABILITY.

                  In case any provision in this Indenture or in the Notes shall
be invalid, illegal or unenforceable, the validity, legality and enforceability
of the remaining provisions shall not in any way be affected or impaired
thereby.

SECTION 11.12     COUNTERPART ORIGINALS.

                  The parties may sign any number of copies of this Indenture.
Each signed copy shall be an original, but all of them together represent the
same agreement.

SECTION 11.13     TABLE OF CONTENTS, HEADINGS, ETC.

                  The Table of Contents, Cross-Reference Table and Headings of
the Articles and Sections of this Indenture have been inserted for convenience
of reference only, are not to be considered a part of this Indenture and shall
in no way modify or restrict any of the terms or provisions hereof.

                            [signature pages follow]


                                       76
<PAGE>   77
                                                                  EXECUTION COPY

                                              SIGNATURES

                                                 DATED AS OF JUNE 23, 1998


                                                 BIRCH TELECOM, INC.


   
                                                 BY: /s/ Bradley Moline
                                                     ---------------------------
                                                     Name: Bradley Moline
                                                     Title: V.P. Finance - Birch
    


   
Attest:
/s/ Gregory C. Lawhon
-------------------------
Name:
Title:
    





                                                 NORWEST BANK MINNESOTA,
                                                 NATIONAL ASSOCIATION


   
                                                 BY: /s/ Jane Schweiger
                                                     ---------------------------
                                                 Name: Jane Schweiger
                                                 Title: Corporate Trust Officer
    
<PAGE>   78
                                                                  EXECUTION COPY

                                   EXHIBIT A-1
                                 (FACE OF NOTE)



                               BIRCH TELECOM, INC.



                            14% SENIOR NOTES DUE 2008



                                                          CUSIP No. [__________]

No. 1                                                              $[__________]

                  BIRCH TELECOM, INC., a Delaware corporation, promises to pay
to Cede & Co., or registered assigns, the principal sum of
[____________________] on June 15, 2008.

                  Interest Payment Dates:  June 15 and  December 15

                  Record Dates: June 1 and  December 1

                  Additional provisions of this Note are set forth on the other
                  side of this Note


                                     A1-78
<PAGE>   79
                  IN WITNESS WHEREOF, the Issuer has caused this Note to be
signed manually or by facsimile by its authorized Officer.


DATED:  JUNE 23, 1998


                                       BIRCH TELECOM, INC.


                                       BY:
                                           Name:         David E. Scott
                                           Title:        Chief Executive Officer







This is one of the Global

Notes referred to in the

within-mentioned Indenture:

NORWEST BANK MINNESOTA, NATIONAL ASSOCIATION,

as Trustee


By:

     Authorized Signatory


                                       79
<PAGE>   80
                                                                  EXECUTION COPY

                                 (Back of Note)
                            14% Senior Notes due 2008

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF
TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE
NAME OF CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY OR SUCH OTHER NAME AS IS
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY TRUST COMPANY (AND
ANY PAYMENT HEREON IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED
BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY TRUST COMPANY), ANY TRANSFER,
PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS
WRONGFUL SINCE THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

TRANSFERS OF THIS GLOBAL NOTE SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN
PART, TO NOMINEES OF CEDE & CO. OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR'S
NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL NOTE SHALL BE LIMITED TO
TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN SECTION 2.06 OF
THE INDENTURE.

THE SECURITIES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY STATE OR OTHER SECURITIES
LAWS. NEITHER THIS SECURITY NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE
REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR OTHERWISE
DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR UNLESS THE TRANSACTION IS
EXEMPT FROM, OR NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES
ACT. THE HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF (1) REPRESENTS THAT
(A) IT IS A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE
SECURITIES ACT) OR (B) IT IS NOT A U.S. PERSON AND IS ACQUIRING ITS NOTE IN AN
"OFFSHORE TRANSACTION" PURSUANT TO REGULATION S UNDER THE SECURITIES ACT, (2)
AGREES THAT IT WILL NOT PRIOR TO (X) THE DATE WHICH IS TWO YEARS (OR SUCH
SHORTER PERIOD OF TIME AS PERMITTED BY RULE 144(k) UNDER THE SECURITIES ACT OR
ANY SUCCESSOR PROVISION THEREUNDER) AFTER THE LATER OF THE ORIGINAL ISSUE DATE
HEREOF (OR OF ANY PREDECESSOR OF THIS SECURITY ) OR THE LAST DAY ON WHICH THE
COMPANY OR ANY AFFILIATE OF THE COMPANY WAS THE OWNER OF THIS SECURITY (OR ANY
PREDECESSOR OF THIS SECURITY) AND (Y) SUCH LATER DATE, IF ANY, AS MAY BE
REQUIRED BY APPLICABLE LAWS (THE "RESALE RESTRICTION TERMINATION DATE"), OFFER,
SELL OR OTHERWISE TRANSFER THIS SECURITY EXCEPT (A) TO THE COMPANY, (B) PURSUANT
TO A REGISTRATION STATEMENT WHICH HAS BEEN DECLARED EFFECTIVE UNDER THE
SECURITIES ACT, (C) FOR SO LONG AS THE SECURITIES ARE ELIGIBLE FOR RESALE
PURSUANT TO RULE 144A, TO A PERSON IT REASONABLY BELIEVES IS A "QUALIFIED
INSTITUTIONAL BUYER" AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT THAT
PURCHASES FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL
BUYER TO WHOM NOTICE IS GIVEN THAT THE TRANSFER IS BEING MADE IN RELIANCE ON
RULE 144A, (D) PURSUANT TO OFFERS AND SALES TO NON-U.S. PERSONS THAT OCCUR
OUTSIDE THE UNITED STATES WITHIN THE


                                     A1-80
<PAGE>   81
MEANING OF REGULATION S UNDER THE SECURITIES ACT OR (E) PURSUANT TO ANOTHER
AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT,
(3) IF THIS SECURITY WAS ACQUIRED IN AN OFFSHORE TRANSACTION PURSUANT TO
REGULATION S, AGREES THAT HEDGING TRANSACTIONS INVOLVING THIS SECURITY MAY NOT
BE CONDUCTED UNLESS IN COMPLIANCE WITH THE SECURITIES ACT AND (4) AGREES THAT IT
WILL GIVE TO EACH PERSON TO WHOM THIS SECURITY IS TRANSFERRED A NOTICE
SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND; PROVIDED THAT THE COMPANY, THE
TRUSTEE AND THE REGISTRAR SHALL HAVE THE RIGHT PRIOR TO ANY SUCH OFFER, SALE OR
TRANSFER, IN EACH OF THE FOREGOING CASES, TO REQUIRE THAT A CERTIFICATION OF
TRANSFER IN THE FORM PROVIDED IN THE INDENTURE IS COMPLETED AND DELIVERED BY THE
TRANSFEROR TO THE TRUSTEE IN CONNECTION WITH ANY TRANSFER OF THIS SECURITY
WITHIN THE TIME PERIOD REFERRED TO ABOVE. THE HOLDER MUST CHECK THE APPROPRIATE
BOX SET FORTH ON THE TRANSFER CERTIFICATE RELATING TO THE MANNER OF SUCH
TRANSFER AND SUBMIT THE CERTIFICATE TO THE TRUSTEE. THIS LEGEND WILL BE REMOVED
UPON THE REQUEST OF THE HOLDER AFTER THE RESALE RESTRICTION TERMINATION DATE. AS
USED HEREIN, THE TERMS "OFFSHORE TRANSACTION," "UNITED STATES" AND "U.S. PERSON"
HAVE THE MEANINGS GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES ACT.

                  UNTIL THE SEPARATION DATE (AS DEFINED), THIS NOTE HAS BEEN
ISSUED AS, AND MUST BE TRANSFERRED AS, A UNIT TOGETHER WITH THE ASSOCIATED
WARRANTS TO PURCHASE COMMON STOCK OF THE COMPANY. EACH UNIT CONSISTS OF $1,000
PRINCIPAL AMOUNT OF NOTES AND A WARRANT TO PURCHASE 12.25856 SHARES OF COMMON
STOCK OF THE COMPANY, SUBJECT TO ADJUSTMENT UNDER CERTAIN CIRCUMSTANCES. A COPY
OF THE WARRANT AGREEMENT PURSUANT TO WHICH THE WARRANTS HAVE BEEN ISSUED IS
AVAILABLE FROM THE COMPANY UPON REQUEST.

                  Capitalized terms used herein shall have the meanings assigned
to them in the Indenture referred to below unless otherwise indicated.

                  1.       INTEREST. Birch Telecom, Inc., a Delaware corporation
(the "Company"), promises to pay interest on the principal amount of this Note
at 14% per annum from June 23, 1998 until maturity and shall pay the Liquidated
Damages, if any, payable pursuant to Section 5 of the Registration Rights
Agreement referred to below. The Company will pay interest and Liquidated
Damages, if any, semi-annually on June 15 and December 15 of each year, or if
any such day is not a Business Day, on the next succeeding Business Day (each an
"Interest Payment Date"); provided that the first such interest payment date
shall be December 15, 1998. Interest on the Notes will accrue from the most
recent date to which interest has been paid or, if no interest has been paid,
from June 23, 1998. The Company shall pay interest (including post-petition
interest in any proceeding under any Bankruptcy Law) on overdue principal and
premium, if any, from time to time on demand at a rate that is 1% per annum in
excess of the rate then in effect; it shall pay interest (including
post-petition interest in any proceeding under any Bankruptcy Law) on overdue
installments of interest and Liquidated Damages (without regard to any
applicable grace periods) from time to time on demand at the same rate to the
extent lawful. Interest will be computed on the basis of a 360-day year of
twelve 30-day months.

                  2.       METHOD OF PAYMENT. The Company will pay interest on
the Notes (except defaulted interest) and Liquidated Damages to the Persons who
are registered Holders of Notes at the 


                                     A1-81
<PAGE>   82
close of business on the June 1 or December 1 next preceding the Interest
Payment Date, even if such Notes are canceled after such record date and on or
before such Interest Payment Date, except as provided in Section 2.12 of the
Indenture with respect to defaulted interest. The Notes will be payable as to
principal, premium and Liquidated Damages, if any, and interest at the office or
agency of the Company maintained for such purpose within or without the City and
State of New York, or, at the option of the Company, payment of interest and
Liquidated Damages may be made by check mailed to the Holders at their addresses
set forth in the register of Holders, and provided that payment by wire transfer
of immediately available funds will be required with respect to principal of and
interest, premium and Liquidated Damages on, all Global Notes and all other
Notes the Holders of which shall have provided wire transfer instructions to the
Company or the Paying Agent. Such payment shall be in such coin or currency of
the United States of America as at the time of payment is legal tender for
payment of public and private debts.

                  3.       PAYING AGENT AND REGISTRAR.  Initially, Norwest Bank 
Minnesota, National Association, the Trustee under the Indenture, will act as
Paying Agent and Registrar. The Company may change any Paying Agent or Registrar
without notice to any Holder. The Company or any of its Subsidiaries may act in
any such capacity.*

                  4.       INDENTURE. The Company issued the Notes under an
Indenture dated as of June 23, 1998 ("Indenture") between the Company and the
Trustee. The terms of the Notes include those stated in the Indenture and those
made part of the Indenture by reference to the Trust Indenture Act of 1939, as
amended (15 U.S. Code Sections 77aaa-77bbbb). The Notes are subject to all
such terms, and Holders are referred to the Indenture and such Act for a
statement of such terms. To the extent any provision of this Note conflicts with
the express provisions of the Indenture, the provisions of the Indenture shall
govern and be controlling. The Notes are obligations of the Company limited to
$115,000,000 in aggregate principal amount, plus amounts, if any, issued to pay
Liquidated Damages on outstanding Notes as set forth in Paragraph 2 hereof.

                  5.       OPTIONAL REDEMPTION.

                  (A)      EXCEPT AS SET FORTH IN SUBPARAGRAPH (B) OF THIS
PARAGRAPH 5, THE COMPANY SHALL NOT HAVE THE OPTION TO REDEEM THE NOTES PURSUANT
TO SECTION 3.07 OF THE INDENTURE PRIOR TO JUNE 15, 2003. THEREAFTER, THE COMPANY
SHALL HAVE THE OPTION TO REDEEM THE NOTES, IN WHOLE OR IN PART, UPON NOT LESS
THAN 30 NOR MORE THAN 60 DAYS NOTICE, AT THE REDEMPTION PRICES (EXPRESSED AS
PERCENTAGES OF PRINCIPAL AMOUNT) SET FORTH BELOW PLUS ACCRUED AND UNPAID
INTEREST AND LIQUIDATED DAMAGES THEREON, IF ANY, TO THE APPLICABLE REDEMPTION
DATE (SUBJECT TO THE RIGHT OF HOLDERS OF RECORD ON THE RELEVANT RECORD DATE TO
RECEIVE INTEREST AND LIQUIDATED DAMAGES DUE ON THE RELEVANT INTEREST PAYMENT
DATE), IF REDEEMED DURING THE TWELVE-MONTH PERIOD BEGINNING ON JUNE 15 OF THE
YEARS INDICATED BELOW:



                  YEAR                                                                  PERCENTAGE
                                                                                     
                  2003                                                                   107.000%
                  2004                                                                   104.667%
                  2005                                                                   102.333%
                  2006 and thereafter                                                     100.00%


                  (B) NOTWITHSTANDING THE PROVISIONS OF SUBPARAGRAPH (A) OF THIS
PARAGRAPH 5, DURING THE FIRST 36 MONTHS AFTER THE DATE OF ORIGINAL ISSUANCE OF
THE NOTES, THE COMPANY MAY ON ANY ONE OR MORE OCCASIONS REDEEM UP TO 35% OF THE
ORIGINALLY ISSUED AGGREGATE PRINCIPAL AMOUNT OF THE NOTES AT A


                                     A1-82
<PAGE>   83
REDEMPTION PRICE OF 114% OF THE PRINCIPAL AMOUNT THEREOF ON THE REDEMPTION DATE,
PLUS LIQUIDATED DAMAGES THEREON, IF ANY, TO THE REDEMPTION DATE (SUBJECT TO THE
RIGHT OF HOLDERS OF RECORD ON THE RELEVANT RECORD DATE TO RECEIVE LIQUIDATED
DAMAGES, IF ANY, DUE ON THE RELEVANT INTEREST PAYMENT DATE), WITH THE NET CASH
PROCEEDS OF ONE OR MORE EQUITY OFFERINGS; PROVIDED THAT AT LEAST 65% OF THE
ORIGINALLY ISSUED AGGREGATE PRINCIPAL AMOUNT OF THE NOTES REMAINS OUTSTANDING
IMMEDIATELY AFTER THE OCCURRENCE OF SUCH REDEMPTION (EXCLUDING NOTES HELD BY THE
COMPANY OR ANY OF ITS SUBSIDIARIES);AND PROVIDED, FURTHER, THAT NOTICE OF SUCH
REDEMPTION SHALL BE GIVEN WITHIN 60 DAYS OF THE DATE OF THE CLOSING OF SUCH
EQUITY OFFERING.

                  6.       MANDATORY REDEMPTION.

                  Except as set forth in paragraph 7 below, the Company shall
not be required to make mandatory redemption payments with respect to the Notes.

                  7.       REPURCHASE AT OPTION OF HOLDER.

                  (a) Upon the occurrence of a Change of Control, each Holder of
Notes shall have the right to require the Company to repurchase all or any part
(equal to $1,000 or an integral multiple thereof) of such Holder's Notes
pursuant to the offer described below (the "Change of Control Offer") at an
offer price in cash equal to 101% of the aggregate principal amount thereof plus
accrued and unpaid interest and Liquidated Damages thereon, if any (the "Change
of Control Payment"). Within 60 days following any Change of Control, the
Company shall mail a notice to each Holder setting forth the procedures
governing the Change of Control Offer as required by the Indenture.

                  (b) If the Company or a Restricted Subsidiary consummates any
Asset Sales, within five days of each date on which the aggregate amount of
Excess Proceeds exceeds $5,000,000, the Company shall commence an offer to all
Holders of Notes (an "Asset Sale Offer") pursuant to Section 3.09 of the
Indenture to purchase the maximum principal amount of Notes and such other
senior Indebtedness of the Company that may be purchased out of the Excess
Proceeds, at an offer price in cash in an amount equal to 100% of the principal
amount thereof plus accrued and unpaid interest and Liquidated Damages thereon,
if any, to the date of purchase (subject to the right of Holders of record on
the relevant record date to receive interest and Liquidated Damages, if any, due
on the relevant interest payment date), in accordance with the procedures set
forth in the Indenture and such other senior Indebtedness of the Company. To the
extent that any Excess Proceeds remain after consummation of an Asset Sale
Offer, the Company may use such Excess Proceeds for any purpose not otherwise
prohibited by the Indenture. If the aggregate principal amount of Notes and such
other senior Indebtedness of the Company tendered into such Asset Sale Offer
surrendered by Holders thereof exceeds the amount of Excess Proceeds, the
Trustee shall select the Notes and such other senior Indebtedness to be
purchased on a pro rata basis. Upon completion of such offer to purchase, the
amount of Excess Proceeds shall be reset to zero. Holders of Notes that are the
subject of an offer to purchase will receive an Asset Sale Offer from the
Company prior to any related purchase date and may elect to have such Notes
purchased by completing the form entitled "Option of Holder to Elect Purchase"
on the reverse of the Notes.

                  8.       NOTICE OF REDEMPTION. Notice of redemption will be
mailed at least 30 days but not more than 60 days before the redemption date to
each Holder whose Notes are to be redeemed at its registered address. Notes in
denominations larger than $1,000 may be redeemed in part but only in whole
multiples of $1,000, unless all of the Notes held by a Holder are to be
redeemed. On and after the redemption date interest ceases to accrue on Notes or
portions thereof called for redemption.


                                     A1-83
<PAGE>   84
                  9.       DENOMINATIONS, TRANSFER, EXCHANGE. The Notes are in
registered form without coupons in denominations of $1,000 and integral
multiples of $1,000. The transfer of Notes may be registered and Notes may be
exchanged as provided in the Indenture. The Registrar and the Trustee may
require a Holder, among other things, to furnish appropriate endorsements and
transfer documents and the Company may require a Holder to pay any taxes and
fees required by law or permitted by the Indenture. The Company need not
exchange or register the transfer of any Note or portion of a Note selected for
redemption, except for the unredeemed portion of any Note being redeemed in
part. Also, the Company need not exchange or register the transfer of any Notes
for a period of 15 days before a selection of Notes to be redeemed or during the
period between a record date and the corresponding Interest Payment Date.

                  10.      PERSONS DEEMED OWNERS.  The registered Holder of a 
Note may be treated as its owner for all purposes.

                  11.      AMENDMENT, SUPPLEMENT AND WAIVER. Subject to certain
exceptions, the Indenture or the Notes may be amended or supplemented with the
consent of the Holders of at least a majority in principal amount of the then
outstanding Notes voting as a single class, and any existing default or
compliance with any provision of the Indenture or the Notes may be waived with
the consent of the Holders of a majority in principal amount of the then
outstanding Notes voting as a single class. Without the consent of any Holder of
a Note, the Indenture or the Notes may be amended or supplemented to cure any
ambiguity, defect or inconsistency, to provide for uncertificated Notes in
addition to or in place of certificated Notes, to provide for the assumption of
the Company's obligations to Holders of the Notes in case of a merger or
consolidation, to make any change that would provide any additional rights or
benefits to the Holders of the Notes or that does not adversely affect the legal
rights under the Indenture of any such Holder, to comply with the requirements
of the SEC in order to effect or maintain the qualification of the Indenture
under the Trust Indenture Act.

                  12.      DEFAULTS AND REMEDIES. Events of Default include (i)
a default in the payment of interest on, or Liquidated Damages, if any, on the
Notes when due and payable as to any Interest Payment Date falling on or prior
to June 15, 2001; (ii) a default in the payment of interest or Liquidated
Damages, if any, on the Notes when due and payable as to any Interest Payment
Date falling after June 15, 2001 and any such failure continues for 30 days;
(iii) a default in the payment of principal of or premium, if any, on the Notes
when the same becomes due and payable at maturity, upon redemption (including in
connection with an offer to purchase) or otherwise; (iv) failure by the Company
or any of its Subsidiaries to comply with any of the provisions of Section 4.10,
4.15 or 5.01 of the Indenture; (v) failure by the Company or any of its
Subsidiaries to observe or perform any other covenant, representation, warranty
or other agreement in the Indenture or the Notes for 30 days after notice to the
Company by the Trustee or the Holders of at least 25% in aggregate principal
amount of the Notes then outstanding; (vi) a default under any mortgage,
indenture or instrument under which there may be issued or by which there may be
secured or evidenced any Indebtedness for money borrowed by the Company or any
of its Restricted Subsidiaries (or the payment of which is guaranteed by the
Company or any of its Restricted Subsidiaries), whether such Indebtedness or
guarantee now exists, or is created after the date of the Indenture, which
default (a) is caused by a failure to pay principal of or premium, if any, or
interest on such Indebtedness prior to the expiration of the grace period
provided in such Indebtedness on the date of such default (a "Payment Default")
or (b) results in the acceleration of such Indebtedness prior to its express
maturity and, in each case, the principal amount of any such Indebtedness,
together with the principal amount of any other such Indebtedness under which
there has been a Payment Default or the maturity of which has been so
accelerated, aggregates $5,000,000 or more; (vii) a final judgment 


                                     A1-84
<PAGE>   85
or final judgments for the payment of money are entered by a court or courts of
competent jurisdiction against the Company or any of its Restricted Subsidiaries
and such judgment or judgments remain unpaid or undischarged for a period
(during which execution shall not be effectively stayed) of 60 days, provided
that the aggregate of all such unpaid or undischarged judgments exceeds
$5,000,000; (viii) the Company asserts in writing that the Pledge Agreement
ceases to be in full force and effect before payment in full of the obligations
thereunder or the Collateral (as defined in the Pledge Agreement) becomes
subject to any Lien other than the Lien under the Pledge Agreement; (ix) certain
events of bankruptcy or insolvency with respect to the Company or any of its
Restricted Subsidiaries; or (x) failure of any Guarantee to be in full force and
effect or the denial by any Guarantor, or any Person acting on behalf of any
Guarantor, of its obligations under its Guarantee. If any Event of Default
occurs and is continuing, the Trustee or the Holders of at least 25% in
principal amount of the then outstanding Notes may declare all the Notes to be
due and payable immediately. Notwithstanding the foregoing, in the case of an
Event of Default arising from certain events of bankruptcy or insolvency with
respect to the Company, all outstanding Notes will become due and payable
without further action or notice. Holders may not enforce the Indenture or the
Notes except as provided in the Indenture. Subject to certain limitations,
Holders of a majority in principal amount of the then outstanding Notes may
direct the Trustee in its exercise of any trust or power. The Trustee may
withhold from Holders of the Notes notice of any continuing Default or Event of
Default (except a Default or Event of Default relating to the payment of
principal or interest) if it determines that withholding notice is in their
interest. The Holders of a majority in aggregate principal amount of the Notes
then outstanding by notice to the Trustee may on behalf of the Holders of all of
the Notes waive any existing Default or Event of Default and its consequences
under the Indenture except a continuing Default or Event Default in the payment
of the principal of, premium or Liquidated Damages, if any, or interest on, the
Notes. The Company is required to deliver to the Trustee annually a statement
regarding compliance with the Indenture, and the Company is required upon
becoming aware of any Default or Event of Default, to deliver to the Trustee a
statement specifying such Default or Event of Default.

                  13. TRUSTEE DEALINGS WITH COMPANY. The Trustee, in its
individual or any other capacity, may make loans to, accept deposits from, and
perform services for the Company or its Affiliates, and may otherwise deal with
the Company or its Affiliates, as if it were not the Trustee.

                  14. NO RECOURSE AGAINST OTHERS. A director, officer, employee,
incorporator or stockholder, of the Company, as such, shall not have any
liability for any obligations of the Company under the Notes or the Indenture or
for any claim based on, in respect of, or by reason of, such obligations or
their creation. Each Holder by accepting a Note waives and releases all such
liability. The waiver and release are part of the consideration for the issuance
of the Notes.

                  15. AUTHENTICATION. This Note shall not be valid until
authenticated by the manual signature of the Trustee or an authenticating agent.

                  16. ABBREVIATIONS. Customary abbreviations may be used in the
name of a Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT
(= tenants by the entireties), JT TEN (= joint tenants with right of
survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (=
Uniform Gifts to Minors Act).

                  17. ADDITIONAL RIGHTS OF HOLDERS OF RESTRICTED GLOBAL NOTES
AND RESTRICTED DEFINITIVE NOTES. In addition to the rights provided to Holders
of Notes under the Indenture, Holders of Restricted Global Notes and Restricted
Definitive Notes shall have all the rights set forth in the Registration Rights
Agreement dated as of June 23, 1998, between the Company and the parties named


                                     A1-85
<PAGE>   86
on the signature pages thereof (the "Registration Rights Agreement").

                  18. CUSIP NUMBERS. Pursuant to a recommendation promulgated by
the Committee on Uniform Security Identification Procedures, the Company has
caused CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP
numbers in notices of redemption as a convenience to Holders. No representation
is made as to the accuracy of such numbers either as printed on the Notes or as
contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

                  The Company will furnish to any Holder upon written request
and without charge a copy of the Indenture and/or the Registration Rights
Agreement. Requests may be made to:

                  Birch Telecom, Inc.
                  1004 Baltimore Avenue, Suite 900
                  Kansas City, MO  64105
                  Attention:  Chief Financial Officer


                                     A1-86
<PAGE>   87
                                 ASSIGNMENT FORM

To assign this Note, fill in the form below: (I) or (we) assign and transfer
this Note to



(Insert assignee's soc. sec. or tax I.D. no.)





(Print or type assignee's name, address and zip code)

and irrevocably appoint to transfer this Note on the books of the Company. The
agent may substitute another to act for him.



Date: 

                                           Your Signature:
                                           (Sign exactly as your name appears on
                                           the face of this Note)


Signature Guarantee.


                                     A1-87
<PAGE>   88
                       OPTION OF HOLDER TO ELECT PURCHASE

                  If you want to elect to have this Note purchased by the
Company pursuant to Section 4.10 or 4.15 of the Indenture, check the box below:

                  / /      Section 4.10            / /      Section 4.15

                  If you want to elect to have only part of the Note purchased
by the Company pursuant to Section 4.10 or Section 4.15 of the Indenture, state
the amount you elect to have purchased: $________





Date:                          Your Signature:
                               (Sign exactly as your name appears on the Note)

                                Tax Identification No:
Signature Guarantee.


                                     A1-88

<PAGE>   89
              SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL NOTE

                  The following exchanges of a part of this Global Note for an
interest in another Global Note or for a Definitive Note, or exchanges of a part
of another Global Note or Definitive Note for an interest in this Global Note,
have been made:




                                                                       Principal Amount
                             Amount of              Amount of                 of
                            decrease in            increase in         this Global Note 
                          Principal Amount       Principal Amount       following such              Signature of
                                 of                     of                decrease (or           authorized officer
  Date of Exchange        this Global Note       this Global Note          increase)                 of Trustee
                                                                                                         





                                     A1-89
<PAGE>   90
                                                                  EXECUTION COPY

                                   EXHIBIT A-2

                  (Face of Regulation S Temporary Global Note)

                               BIRCH TELECOM, INC.



                            14% SENIOR NOTES DUE 2008



                                                          CUSIP NO.:____________

No. 1                                                              $[__________]

                  BIRCH TELECOM, INC., a Delaware corporation, promises to pay
to Cede & Co., or registered assigns, the principal sum of
[_________________________] on June 15, 2008.

                  Interest Payment Dates:  June 15 and  December 15

                  Record Dates: June 1 and  December 1

                  Additional provisions of this Note are set forth on the other
                  side of this Note


                                     A2-90
<PAGE>   91
                  IN WITNESS WHEREOF, the Issuer has caused this Note to be
signed manually or by facsimile by its authorized Officer.


DATED:  JUNE 23, 1998


                                     BIRCH TELECOM, INC.


                                     BY:
                                         Name:         David E. Scott
                                         Title:        Chief Executive Officer







This is one of the Global

Notes referred to in the

within-mentioned Indenture:

NORWEST BANK MINNESOTA, NATIONAL ASSOCIATION,

as Trustee


By:_______________________________________________________

                          _________Authorized Signatory


                                     A2-91
<PAGE>   92
                                 (Back of Note)
                            14% Senior Notes due 2008

THE RIGHTS ATTACHING TO THIS REGULATION S TEMPORARY GLOBAL NOTE, AND THE
CONDITIONS AND PROCEDURES GOVERNING ITS EXCHANGE FOR PERMANENT OR CERTIFICATED
NOTES, ARE AS SPECIFIED IN THE INDENTURE (AS DEFINED HEREIN). NEITHER THE HOLDER
NOR THE BENEFICIAL OWNERS OF THIS REGULATION S TEMPORARY GLOBAL NOTE SHALL BE
ENTITLED TO RECEIVE PAYMENT OF INTEREST HEREON.

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF
TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE
NAME OF CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY OR SUCH OTHER NAME AS IS
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY TRUST COMPANY (AND
ANY PAYMENT HEREON IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED
BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITARY TRUST COMPANY), ANY TRANSFER,
PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS
WRONGFUL SINCE THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

TRANSFERS OF THIS GLOBAL NOTE SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN
PART, TO NOMINEES OF CEDE & CO. OR TO A SUCCESSOR THEREOF OR SUCH SUCCESSOR'S
NOMINEE AND TRANSFERS OF PORTIONS OF THIS GLOBAL NOTE SHALL BE LIMITED TO
TRANSFERS MADE IN ACCORDANCE WITH THE RESTRICTIONS SET FORTH IN SECTION 2.06 OF
THE INDENTURE.

THE SECURITIES EVIDENCED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY STATE OR OTHER SECURITIES
LAWS. NEITHER THIS SECURITY NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE
REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR OTHERWISE
DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR UNLESS THE TRANSACTION IS
EXEMPT FROM, OR NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES
ACT. THE HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF (1) REPRESENTS THAT
(A) IT IS A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE
SECURITIES ACT) OR (B) IT IS NOT A U.S. PERSON AND IS ACQUIRING ITS NOTE IN AN
"OFFSHORE TRANSACTION" PURSUANT TO REGULATION S UNDER THE SECURITIES ACT, (2)
AGREES THAT IT WILL NOT PRIOR TO (X) THE DATE WHICH IS TWO YEARS (OR SUCH
SHORTER PERIOD OF TIME AS PERMITTED BY RULE 144(k) UNDER THE SECURITIES ACT OR
ANY SUCCESSOR PROVISION THEREUNDER) AFTER THE LATER OF THE ORIGINAL ISSUE DATE
HEREOF (OR OF ANY PREDECESSOR OF THIS SECURITY) OR THE LAST DAY ON WHICH THE
COMPANY OR ANY AFFILIATE OF THE COMPANY WAS THE OWNER OF THIS SECURITY (OR ANY
PREDECESSOR OF THIS SECURITY) AND (Y) SUCH LATER DATE, IT ANY, AS MAY BE
REQUIRED BY APPLICABLE LAWS (THE "RESALE RESTRICTION TERMINATION DATE"), OFFER,
SELL OR OTHERWISE TRANSFER THIS SECURITY EXCEPT (A) TO THE COMPANY, (B) PURSUANT
TO A REGISTRATION STATEMENT WHICH AHS BEEN DECLARED EFFECTIVE UNDER THE
SECURITIES ACT, (C) FOR SO LONG AS THE SECURITIES ARE


                                     A2-92
<PAGE>   93
ELIGIBLE UNDER FOR RESALE PURSUANT TO RULE 144A, TO A PERSON IT REASONABLY
BELIEVES IS A "QUALIFIED INSTITUTIONAL BUYER" AS DEFINED IN RULE 144A UNDER THE
SECURITIES ACT THAT PURCHASES FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A
QUALIFIED INSTITUTIONAL BUYER TO WHOM NOTICE IS GIVEN THAT THE TRANSFER IS BEING
MADE IN RELIANCE ON RULE 144A, (D) PURSUANT TO OFFERS AND SALES TO NON-U.S.
PERSONS THAT OCCUR OUTSIDE THE UNTIED STATES WITHIN THE MEANING OF REGULATION S
UNDER THE SECURITIES ACT OR (E) PURSUANT TO ANOTHER AVAILABLE EXEMPTION FROM THE
REGISTRATION REQUIREMENTS OF THE SECURITIES ACT, (3) IF THIS SECURITY WAS
ACQUIRED IN AN OFFSHORE TRANSACTION PURSUANT TO REGULATION S, AGREES THAT
HEDGING TRANSACTIONS INVOLVING THIS SECURITY MAY NOT BE CONDUCTED UNLESS IN
COMPLIANCE WITH THE SECURITIES ACT AND (4) AGREES THAT IT WILL GIVE TO EACH
PERSON TO WHOM THIS SECURITY IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT
OF THIS LEGEND; PROVIDED THAT THE COMPANY, THE TRUSTEE AND THE REGISTRAR SHALL
HAVE THE RIGHT PRIOR TO ANY SUCH OFFER, SALE OR TRANSFER, IN EACH OF THE
FOREGOING CASES, TO REQUIRE THAT A CERTIFICATION OF TRANSFER IN THE FORM
PROVIDED IN THE INDENTURE IS COMPLETED AND DELIVERED BY THE TRANSFEROR TO THE
TRUSTEE IN CONNECTION WITH ANY TRANSFER OF THIS SECURITY WITHIN THE TIME PERIOD
REFERRED TO ABOVE. THE HOLDER MUST CHECK THE APPROPRIATE BOX SET FORTH ON THE
TRANSFER CERTIFICATE RELATING TO THE MANNER OF SUCH TRANSFER AND SUBMIT THE
CERTIFICATE TO THE TRUSTEE. THIS LEGEND WILL BE REMOVED UPON THE REQUEST OF THE
HOLDER AFTER THE RESALE RESTRICTION TERMINATION DATE. AS USED HEREIN, THE TERMS
"OFFSHORE TRANSACTION," "UNITED STATES" AND "U.S. PERSON" HAVE THE MEANINGS
GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES ACT.

                  UNTIL THE SEPARATION DATE (AS DEFINED), THIS NOTE HAS BEEN
ISSUED AS, AND MUST BE TRANSFERRED AS, A UNIT TOGETHER WITH THE ASSOCIATED
WARRANTS TO PURCHASE COMMON STOCK OF THE COMPANY. EACH UNIT CONSISTS OF $1,000
PRINCIPAL AMOUNT OF NOTES AND A WARRANT TO PURCHASE 12.25856 SHARES OF COMMON
STOCK OF THE COMPANY, SUBJECT TO ADJUSTMENT UNDER CERTAIN CIRCUMSTANCES. A COPY
OF THE WARRANT AGREEMENT PURSUANT TO WHICH THE WARRANTS HAVE BEEN ISSUED IS
AVAILABLE FROM THE COMPANY UPON REQUEST.

                  Capitalized terms used herein shall have the meanings assigned
to them in the Indenture referred to below unless otherwise indicated.

                  1. INTEREST. Birch Telecom, Inc., a Delaware corporation (the
"Company"), promises to pay interest on the principal amount of this Note at 14%
per annum from June 23, 1998 until maturity and shall pay the Liquidated
Damages, if any, payable pursuant to Section 5 of the Registration Rights
Agreement referred to below. The Company will pay interest and Liquidated
Damages, if any, semi-annually on June 15 and December 15 of each year, or if
any such day is not a Business Day, on the next succeeding Business Day (each an
"Interest Payment Date"); provided that the first such interest payment date
shall be December 15, 1998. Interest on the Notes will accrue from the most
recent date to which interest has been paid or, if no interest has been paid,
from June 23, 1998. The Company shall pay interest (including post-petition
interest in any proceeding under any Bankruptcy Law) on overdue principal and 
premium, if any, from time to time on demand at a rate that is 1% per annum in
excess of the rate then in effect; it shall pay interest (including
post-petition interest in any proceeding under any



                                     A2-93
<PAGE>   94
Bankruptcy Law) on overdue installments of interest and Liquidated Damages
(without regard to any applicable grace periods) from time to time on demand at
the same rate to the extent lawful. Interest will be computed on the basis of a
360-day year of twelve 30-day months.

                  2. METHOD OF PAYMENT. The Company will pay interest on the
Notes (except defaulted interest) and Liquidated Damages to the Persons who are
registered Holders of Notes at the close of business on the June 1 or December 1
next preceding the Interest Payment Date, even if such Notes are canceled after
such record date and on or before such Interest Payment Date, except as provided
in Section 2.12 of the Indenture with respect to defaulted interest. The Notes
will be payable as to principal, premium and Liquidated Damages, if any, and
interest at the office or agency of the Company maintained for such purpose
within or without the City and State of New York, or, at the option of the
Company, payment of interest and Liquidated Damages may be made by check mailed
to the Holders at their addresses set forth in the register of Holders, and
provided that payment by wire transfer of immediately available funds will be
required with respect to principal of and interest, premium and Liquidated
Damages on, all Global Notes and all other Notes the Holders of which shall have
provided wire transfer instructions to the Company or the Paying Agent. Such
payment shall be in such coin or currency of the United States of America as at
the time of payment is legal tender for payment of public and private debts.

                  3. PAYING AGENT AND REGISTRAR. Initially, Norwest Bank
Minnesota, National Association, the Trustee under the Indenture, will act as
Paying Agent and Registrar. The Company may change any Paying Agent or Registrar
without notice to any Holder. The Company or any of its Subsidiaries may act in
any such capacity.*

                  4. INDENTURE. The Company issued the Notes under an Indenture
dated as of June 23, 1998 ("Indenture") between the Company and the Trustee. The
terms of the Notes include those stated in the Indenture and those made part of
the Indenture by reference to the Trust Indenture Act of 1939, as amended (15
U.S. Code Sections 77aaa-77bbbb). The Notes are subject to all such terms,
and Holders are referred to the Indenture and such Act for a statement of such
terms. To the extent any provision of this Note conflicts with the express
provisions of the Indenture, the provisions of the Indenture shall govern and be
controlling. The Notes are obligations of the Company limited to $115,000,000 in
aggregate principal amount, plus amounts, if any, issued to pay Liquidated
Damages on outstanding Notes as set forth in Paragraph 2 hereof.

                  5. OPTIONAL REDEMPTION.

                  (A) EXCEPT AS SET FORTH IN SUBPARAGRAPH (B) OF THIS PARAGRAPH
5, THE COMPANY SHALL NOT HAVE THE OPTION TO REDEEM THE NOTES PURSUANT TO SECTION
3.07 OF THE INDENTURE PRIOR TO JUNE 15, 2003. THEREAFTER, THE COMPANY SHALL HAVE
THE OPTION TO REDEEM THE NOTES, IN WHOLE OR IN PART, UPON NOT LESS THAN 30 NOR
MORE THAN 60 DAYS NOTICE, AT THE REDEMPTION PRICES (EXPRESSED AS PERCENTAGES OF
PRINCIPAL AMOUNT) SET FORTH BELOW PLUS ACCRUED AND UNPAID INTEREST AND
LIQUIDATED DAMAGES THEREON, IF ANY, TO THE APPLICABLE REDEMPTION DATE (SUBJECT
TO THE RIGHT OF HOLDERS OF RECORD ON THE RELEVANT RECORD DATE TO RECEIVE
INTEREST AND LIQUIDATED DAMAGES DUE ON THE RELEVANT INTEREST PAYMENT DATE), IF
REDEEMED DURING THE TWELVE-MONTH PERIOD BEGINNING ON JUNE 15 OF THE YEARS
INDICATED BELOW:



                  YEAR                                                                  PERCENTAGE
                                                                                     
                  2003                                                                    107.000%
                  2004                                                                    104.667%



                                     A2-94
<PAGE>   95

                                                                                       
                  2005                                                                    102.333%
                  2006 and thereafter                                                      100.00%


                  (B) NOTWITHSTANDING THE PROVISIONS OF SUBPARAGRAPH (A) OF THIS
PARAGRAPH 5, DURING THE FIRST 36 MONTHS AFTER THE DATE OF ORIGINAL ISSUANCE OF
THE NOTES, THE COMPANY MAY ON ANY ONE OR MORE OCCASIONS REDEEM UP TO 35% OF THE
ORIGINALLY ISSUED AGGREGATE PRINCIPAL AMOUNT OF THE NOTES AT A REDEMPTION PRICE
OF 114% OF THE PRINCIPAL AMOUNT THEREOF ON THE REDEMPTION DATE, PLUS LIQUIDATED
DAMAGES THEREON, IF ANY, TO THE REDEMPTION DATE (SUBJECT TO THE RIGHT OF HOLDERS
OF RECORD ON THE RELEVANT RECORD DATE TO RECEIVE LIQUIDATED DAMAGES, IF ANY, DUE
ON THE RELEVANT INTEREST PAYMENT DATE), WITH THE NET CASH PROCEEDS OF ONE OR
MORE EQUITY OFFERINGS; PROVIDED THAT AT LEAST 65% OF THE ORIGINALLY ISSUED
AGGREGATE PRINCIPAL AMOUNT OF THE NOTES REMAINS OUTSTANDING IMMEDIATELY AFTER
THE OCCURRENCE OF SUCH REDEMPTION (EXCLUDING NOTES HELD BY THE COMPANY OR ANY OF
ITS SUBSIDIARIES);AND PROVIDED, FURTHER, THAT NOTICE OF SUCH REDEMPTION SHALL BE
GIVEN WITHIN 60 DAYS OF THE DATE OF THE CLOSING OF SUCH EQUITY OFFERING.

                  6.       MANDATORY REDEMPTION.

                  Except as set forth in paragraph 7 below, the Company shall
not be required to make mandatory redemption payments with respect to the Notes.

                  7.       REPURCHASE AT OPTION OF HOLDER.

                  (a) Upon the occurrence of a Change of Control, each Holder of
Notes shall have the right to require the Company to repurchase all or any part
(equal to $1,000 or an integral multiple thereof) of such Holder's Notes
pursuant to the offer described below (the "Change of Control Offer") at an
offer price in cash equal to 101% of the aggregate principal amount thereof plus
accrued and unpaid interest and Liquidated Damages thereon, if any (the "Change
of Control Payment"). Within 60 days following any Change of Control, the
Company shall mail a notice to each Holder setting forth the procedures
governing the Change of Control Offer as required by the Indenture.

                  (b) If the Company or a Restricted Subsidiary consummates any
Asset Sales, within five days of each date on which the aggregate amount of
Excess Proceeds exceeds $5,000,000, the Company shall commence an offer to all
Holders of Notes (an "Asset Sale Offer") pursuant to Section 3.09 of the
Indenture to purchase the maximum principal amount of Notes and such other
senior Indebtedness of the Company that may be purchased out of the Excess
Proceeds, at an offer price in cash in an amount equal to 100% of the principal
amount thereof plus accrued and unpaid interest and Liquidated Damages thereon,
if any, to the date of purchase (subject to the right of Holders of record on
the relevant record date to receive interest and Liquidated Damages, if any, due
on the relevant interest payment date), in accordance with the procedures set
forth in the Indenture and such other senior Indebtedness of the Company. To the
extent that any Excess Proceeds remain after consummation of an Asset Sale
Offer, the Company may use such Excess Proceeds for any purpose not otherwise
prohibited by the Indenture. If the aggregate principal amount of Notes and such
other senior Indebtedness of the Company tendered into such Asset Sale Offer
surrendered by Holders thereof exceeds the amount of Excess Proceeds, the
Trustee shall select the Notes and such other senior Indebtedness to be
purchased on a pro rata basis. Upon completion of such offer to purchase, the
amount of Excess Proceeds shall be reset to zero. Holders of Notes that are the
subject of an offer to purchase will receive an Asset Sale Offer from the
Company prior to any related purchase date and may elect to have such Notes
purchased by completing the form entitled "Option of Holder to Elect Purchase"
on the reverse of the Notes.


                                     A2-95
<PAGE>   96
                  8. NOTICE OF REDEMPTION. Notice of redemption will be mailed
at least 30 days but not more than 60 days before the redemption date to each
Holder whose Notes are to be redeemed at its registered address. Notes in
denominations larger than $1,000 may be redeemed in part but only in whole
multiples of $1,000, unless all of the Notes held by a Holder are to be
redeemed. On and after the redemption date interest ceases to accrue on Notes or
portions thereof called for redemption.

                  9. DENOMINATIONS, TRANSFER, EXCHANGE. The Notes are in
registered form without coupons in denominations of $1,000 and integral
multiples of $1,000. The transfer of Notes may be registered and Notes may be
exchanged as provided in the Indenture. The Registrar and the Trustee may
require a Holder, among other things, to furnish appropriate endorsements and
transfer documents and the Company may require a Holder to pay any taxes and
fees required by law or permitted by the Indenture. The Company need not
exchange or register the transfer of any Note or portion of a Note selected for
redemption, except for the unredeemed portion of any Note being redeemed in
part. Also, the Company need not exchange or register the transfer of any Notes
for a period of 15 days before a selection of Notes to be redeemed or during the
period between a record date and the corresponding Interest Payment Date.

                  10. PERSONS DEEMED OWNERS. The registered Holder of a Note may
be treated as its owner for all purposes.

                  11. AMENDMENT, SUPPLEMENT AND WAIVER. Subject to certain
exceptions, the Indenture or the Notes may be amended or supplemented with the
consent of the Holders of at least a majority in principal amount of the then
outstanding Notes voting as a single class, and any existing default or
compliance with any provision of the Indenture or the Notes may be waived with
the consent of the Holders of a majority in principal amount of the then
outstanding Notes voting as a single class. Without the consent of any Holder of
a Note, the Indenture or the Notes may be amended or supplemented to cure any
ambiguity, defect or inconsistency, to provide for uncertificated Notes in
addition to or in place of certificated Notes, to provide for the assumption of
the Company's obligations to Holders of the Notes in case of a merger or
consolidation, to make any change that would provide any additional rights or
benefits to the Holders of the Notes or that does not adversely affect the legal
rights under the Indenture of any such Holder, to comply with the requirements
of the SEC in order to effect or maintain the qualification of the Indenture
under the Trust Indenture Act.

                  12. DEFAULTS AND REMEDIES. Events of Default include (i) a
default in the payment of interest on, or Liquidated Damages, if any, on the
Notes when due and payable as to any Interest Payment Date falling on or prior
to June 15, 2001; (ii) a default in the payment of interest or Liquidated
Damages, if any, on the Notes when due and payable as to any Interest Payment
Date falling after June 15, 2001 and any such failure continues for 30 days;
(iii) a default in the payment of principal of or premium, if any, on the Notes
when the same becomes due and payable at maturity, upon redemption (including in
connection with an offer to purchase) or otherwise; (iv) failure by the Company
or any of its Subsidiaries to comply with any of the provisions of Section 4.10,
4.15 or 5.01 of the Indenture; (v) failure by the Company or any of its
Subsidiaries to observe or perform any other covenant, representation, warranty
or other agreement in the Indenture or the Notes for 30 days after notice to the
Company by the Trustee or the Holders of at least 25% in aggregate principal
amount of the Notes then outstanding; (vi) a default under any mortgage,
indenture or instrument under which there may be issued or by which there may be
secured or evidenced any Indebtedness for money borrowed by the Company or any
of its Restricted Subsidiaries (or the payment of which is guaranteed by the
Company or any of its Restricted Subsidiaries), whether such Indebtedness or
guarantee now exists, or is created after the date of the Indenture, which
default (a) is caused by a failure to pay principal of or premium, if any, or


                                     A2-96
<PAGE>   97
interest on such Indebtedness prior to the expiration of the grace period
provided in such Indebtedness on the date of such default (a "Payment Default")
or (b) results in the acceleration of such Indebtedness prior to its express
maturity and, in each case, the principal amount of any such Indebtedness,
together with the principal amount of any other such Indebtedness under which
there has been a Payment Default or the maturity of which has been so
accelerated, aggregates $5,000,000 or more; (vii) a final judgment or final
judgments for the payment of money are entered by a court or courts of competent
jurisdiction against the Company or any of its Restricted Subsidiaries and such
judgment or judgments remain unpaid or undischarged for a period (during which
execution shall not be effectively stayed) of 60 days, provided that the
aggregate of all such unpaid or undischarged judgments exceeds $5,000,000;
(viii) the Company asserts in writing that the Pledge Agreement ceases to be in
full force and effect before payment in full of the obligations thereunder or
the Collateral (as defined in the Pledge Agreement) becomes subject to any Lien
other than the Lien under the Pledge Agreement; (ix) certain events of
bankruptcy or insolvency with respect to the Company or any of its Restricted
Subsidiaries; or (x) failure of any Guarantee to be in full force and effect or
the denial by any Guarantor, or any Person acting on behalf of any Guarantor, of
its obligations under its Guarantee. If any Event of Default occurs and is
continuing, the Trustee or the Holders of at least 25% in principal amount of
the then outstanding Notes may declare all the Notes to be due and payable
immediately. Notwithstanding the foregoing, in the case of an Event of Default
arising from certain events of bankruptcy or insolvency with respect to the
Company, all outstanding Notes will become due and payable without further
action or notice. Holders may not enforce the Indenture or the Notes except as
provided in the Indenture. Subject to certain limitations, Holders of a majority
in principal amount of the then outstanding Notes may direct the Trustee in its
exercise of any trust or power. The Trustee may withhold from Holders of the
Notes notice of any continuing Default or Event of Default (except a Default or
Event of Default relating to the payment of principal or interest) if it
determines that withholding notice is in their interest. The Holders of a
majority in aggregate principal amount of the Notes then outstanding by notice
to the Trustee may on behalf of the Holders of all of the Notes waive any
existing Default or Event of Default and its consequences under the Indenture
except a continuing Default or Event Default in the payment of the principal of,
premium or Liquidated Damages, if any, or interest on, the Notes. The Company is
required to deliver to the Trustee annually a statement regarding compliance
with the Indenture, and the Company is required upon becoming aware of any
Default or Event of Default, to deliver to the Trustee a statement specifying
such Default or Event of Default.

                  13. TRUSTEE DEALINGS WITH COMPANY. The Trustee, in its
individual or any other capacity, may make loans to, accept deposits from, and
perform services for the Company or its Affiliates, and may otherwise deal with
the Company or its Affiliates, as if it were not the Trustee.

                  14. NO RECOURSE AGAINST OTHERS. A director, officer, employee,
incorporator or stockholder, of the Company, as such, shall not have any
liability for any obligations of the Company under the Notes or the Indenture or
for any claim based on, in respect of, or by reason of, such obligations or
their creation. Each Holder by accepting a Note waives and releases all such
liability. The waiver and release are part of the consideration for the issuance
of the Notes.

                  15. AUTHENTICATION. This Note shall not be valid until
authenticated by the manual signature of the Trustee or an authenticating agent.

                  16. ABBREVIATIONS. Customary abbreviations may be used in the
name of a Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT
(= tenants by the entireties), JT TEN (= joint tenants with right of
survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (=
Uniform Gifts to Minors Act).


                                     A2-97
<PAGE>   98
                  17. ADDITIONAL RIGHTS OF HOLDERS OF RESTRICTED GLOBAL NOTES
AND RESTRICTED DEFINITIVE NOTES. In addition to the rights provided to Holders
of Notes under the Indenture, Holders of Restricted Global Notes and Restricted
Definitive Notes shall have all the rights set forth in the Registration Rights
Agreement dated as of June 23, 1998, between the Company and the parties named
on the signature pages thereof (the "Registration Rights Agreement").

                  18. CUSIP NUMBERS. Pursuant to a recommendation promulgated by
the Committee on Uniform Security Identification Procedures, the Company has
caused CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP
numbers in notices of redemption as a convenience to Holders. No representation
is made as to the accuracy of such numbers either as printed on the Notes or as
contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

                  The Company will furnish to any Holder upon written request
and without charge a copy of the Indenture and/or the Registration Rights
Agreement. Requests may be made to:

                  Birch Telecom, Inc.
                  1004 Baltimore Avenue, Suite 900
                  Kansas City, MO  64105
                  Attention:  Chief Financial Officer


                                     A2-98
<PAGE>   99
                                 ASSIGNMENT FORM

To assign this Note, fill in the form below: (I) or (we) assign and transfer
this Note to


                  (Insert assignee's soc. sec. or tax I.D. no.)






                  (Print or type assignee's name, address and zip code)

and irrevocably appoint
to transfer this Note on the books of the Company. The agent may substitute
another to act for him.



Date:                                        Your Signature:

(Sign exactly as your name appears on the face of this Note)

Signature Guarantee.


                                     A2-99
<PAGE>   100
                       OPTION OF HOLDER TO ELECT PURCHASE

                  If you want to elect to have this Note purchased by the
Company pursuant to Section 4.10 or 4.15 of the Indenture, check the appropriate
box below:

         / /      Section 4.10               / /      Section 4.15

                  If you want to elect to have only part of the Note purchased
by the Company pursuant to Section 4.10 or Section 4.15 of the Indenture, state
the amount you elect to have purchased: $___________



Date:                                                    Your Signature:
(Sign exactly as your name appears on the Note)

                                                         Tax Identification No.:


Signature Guarantee.


                                     A2-100
<PAGE>   101
           SCHEDULE OF EXCHANGES OF REGULATION S TEMPORARY GLOBAL NOTE

                  The following exchanges of a part of this Regulation S
Temporary Global Note for an interest in another Global Note, or of other
Restricted Global Notes for an interest in this Regulation S Temporary Global
Note, have been made:




                                                                      Principal Amount
                              Amount of        Amount of increase         of this
                             decrease in          in Principal         Global Note
                          Principal Amount           Amount            Following such          Signature of
                                 of                    Of               decrease (or          authorized officer
   Date of Exchange       this Global Note      this Global Note          increase)             of Trustee
                                                                                   





                                     A2-101
<PAGE>   102
                                                                  EXECUTION COPY

                                    EXHIBIT B


                         FORM OF CERTIFICATE OF TRANSFER

Birch Telecom, Inc.
1004 Baltimore Avenue, Suite 900
Kansas City, MO  64105

Norwest Bank Minnesota, National Association
Sixth and Marquette
Minneapolis, MN  55479-0069
Attention:  Corporate Trust

                  Re:      14% Senior Notes Due 2008

                  Reference is hereby made to the Indenture, dated as of June
23, 1998 (the "Indenture"), between Birch Telecom, Inc., as issuer (the
"Company"), and Norwest Bank Minnesota, National Association, as trustee.
Capitalized terms used but not defined herein shall have the meanings given to
them in the Indenture.

                  ______________, (the "Transferor") owns and proposes to
transfer the Note[s] or interest in such Note[s] specified in Annex A hereto, in
the principal amount of $___________ in such Note[s] or interests (the
"Transfer"), to __________ (the "Transferee"), as further specified in Annex A
hereto. In connection with the Transfer, the Transferor hereby certifies that:

[CHECK ALL THAT APPLY]

1. / /    CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL INTEREST IN
THE 144A GLOBAL NOTE OR A DEFINITIVE NOTE PURSUANT TO RULE 144A. The Transfer is
being effected pursuant to and in accordance with Rule 144A under the United
States Securities Act of 1933, as amended (the "Securities Act"), and,
accordingly, the Transferor hereby further certifies that the beneficial
interest or Definitive Note is being transferred to a Person that the Transferor
reasonably believed and believes is purchasing the beneficial interest or
Definitive Note for its own account, or for one or more accounts with respect to
which such Person exercises sole investment discretion, and such Person and each
such account is a "qualified institutional buyer" within the meaning of Rule
144A in a transaction meeting the requirements of Rule 144A and such Transfer is
in compliance with any applicable blue sky securities laws of any state of the
United States. Upon consummation of the proposed Transfer in accordance with the
terms of the Indenture, the transferred beneficial interest or Definitive Note
will be subject to the restrictions on transfer enumerated in the Private
Placement Legend printed on the 144A Global Note and/or the Definitive Note and
in the Indenture and the Securities Act.

2. / /    CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL INTEREST IN
THE TEMPORARY REGULATION S GLOBAL NOTE, THE REGULATION S GLOBAL NOTE OR A
DEFINITIVE NOTE PURSUANT TO REGULATION S. The Transfer is being effected
pursuant to and in accordance with Rule 903 or Rule 904


                                     A2-102
<PAGE>   103
under the Securities Act and, accordingly, the Transferor hereby further
certifies that (i) the Transfer is not being made to a person in the United
States and (x) at the time the buy order was originated, the Transferee was
outside the United States or such Transferor and any Person acting on its behalf
reasonably believed and believes that the Transferee was outside the United
States or (y) the transaction was executed in, on or through the facilities of a
designated offshore securities market and neither such Transferor nor any Person
acting on its behalf knows that the transaction was prearranged with a buyer in
the United States, (ii) no directed selling efforts have been made in
contravention of the requirements of Rule 903(b) or Rule 904(b) of Regulation S
under the Securities Act, (iii) the transaction is not part of a plan or scheme
to evade the registration requirements of the Securities Act and (iv) if the
proposed transfer is being made prior to the expiration of the Distribution
Compliance Period, the transfer is not being made to a U.S. Person or for the
account or benefit of a U.S. Person (other than an Initial Purchaser). Upon
consummation of the proposed transfer in accordance with the terms of the
Indenture, the transferred beneficial interest or Definitive Note will be
subject to the restrictions on Transfer enumerated in the Private Placement
Legend printed on the Regulation S Global Note, the Temporary Regulation S
Global Note and/or the Definitive Note and in the Indenture and the Securities
Act.

3. / /     CHECK AND COMPLETE IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL
INTEREST IN A 144A GLOBAL NOTE OR A DEFINITIVE NOTE PURSUANT TO ANY PROVISION OF
THE SECURITIES ACT OTHER THAN RULE 144A OR REGULATION S. The Transfer is being
effected in compliance with the transfer restrictions applicable to beneficial
interests in Restricted Global Notes and Restricted Definitive Notes and
pursuant to and in accordance with the Securities Act and any applicable blue
sky securities laws of any state of the United States, and accordingly the
Transferor hereby further certifies that (check one):

                  (a) / / such Transfer is being effected pursuant to and in
accordance with Rule 144 under the Securities Act;

                                       or

                  (b) / / such Transfer is being effected to the Company or a
subsidiary thereof;

                                       or

                  (c) / / such Transfer is being effected pursuant to an
effective registration statement under the Securities Act and in compliance with
the prospectus delivery requirements of the Securities Act;

                                       or

                  (d) / / such Transfer is being effected to an Institutional
Accredited Investor and pursuant to an available exemption from the registration
requirements of the Securities Act (other than Rule 144A, Rule 144 or Regulation
S), which certification is supported by (1) a certificate executed by the
Transferee in the form of Exhibit D to the Indenture and (2) if such Transfer is
in respect of a principal amount of Notes at the time of transfer of less than
$250,000, an Opinion of Counsel provided by the Transferor or the Transferee (a
copy of which the Transferor has attached to this certification), to the effect
that such transfer is in compliance with the Securities Act. Upon consummation
of the proposed transfer in accordance with the terms of the Indenture, the
transferred beneficial interest or Definitive Note will be evidenced by a
Definitive Note and will be subject to the restrictions on transfer enumerated
in the Private Placement Legend printed on the Restricted Definitive Notes and
in the 


                                     B-103
<PAGE>   104
Indenture and the Securities Act.

4. / / CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL INTEREST IN AN
UNRESTRICTED GLOBAL NOTE OR OF AN UNRESTRICTED DEFINITIVE NOTE.

                  (a) / / CHECK IF TRANSFER IS PURSUANT TO RULE 144. (i) The
Transfer is being effected pursuant to and in accordance with Rule 144 under the
Securities Act and in compliance with the transfer restrictions contained in the
Indenture and any applicable blue sky securities laws of any state of the United
States and (ii) the restrictions on transfer contained in the Indenture and the
Private Placement Legend are not required in order to maintain compliance with
the Securities Act. Upon consummation of the proposed Transfer in accordance
with the terms of the Indenture, the transferred beneficial interest or
Definitive Note will no longer be subject to the restrictions on transfer
enumerated in the Private Placement Legend printed on the Restricted Global
Notes, on Restricted Definitive Notes and in the Indenture.

                  (b) / / CHECK IF TRANSFER IS PURSUANT TO REGULATION S. (i) The
Transfer is being effected pursuant to and in accordance with Rule 903 or Rule
904 under the Securities Act and in compliance with the transfer restrictions
contained in the Indenture and any applicable blue sky securities laws of any
state of the United States and (ii) the restrictions on transfer contained in
the Indenture and the Private Placement Legend are not required in order to
maintain compliance with the Securities Act. Upon consummation of the proposed
Transfer in accordance with the terms of the Indenture, the transferred
beneficial interest or Definitive Note will no longer be subject to the
restrictions on transfer enumerated in the Private Placement Legend printed on
the Restricted Global Notes, on Restricted Definitive Notes and in the
Indenture.

                  (c) / / CHECK IF TRANSFER IS PURSUANT TO OTHER EXEMPTION. (i)
The Transfer is being effected pursuant to and in compliance with an exemption
from the registration requirements of the Securities Act other than Rule 144,
Rule 903 or Rule 904 and in compliance with the transfer restrictions contained
in the Indenture and any applicable blue sky securities laws of any State of the
United States and (ii) the restrictions on transfer contained in the Indenture
and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act. Upon consummation of the proposed Transfer
in accordance with the terms of the Indenture, the transferred beneficial
interest or Definitive Note will not be subject to the restrictions on transfer
enumerated in the Private Placement Legend printed on the Restricted Global
Notes or Restricted Definitive Notes and in the Indenture.

                  This certificate and the statements contained herein are made
for your benefit and the benefit of the Company.


                                                     [Insert Name of Transferor]


                                                     By:
                                                          Name:
                                                          Title:
Dated:                       ,


                                     B-104
<PAGE>   105
                       ANNEX A TO CERTIFICATE OF TRANSFER

1.       The Transferor owns and proposes to transfer the following:

                            [CHECK ONE OF (a) OR (b)]

         (a)      / /      a beneficial interest in the:

                  (i)      / /      144A Global Note (CUSIP          ), or

                  (ii)     / /      Regulation S Global Note (CUSIP       ), or

         (b)      / /      a Restricted Definitive Note.

         2.       After the Transfer the Transferee will hold:

                                   [CHECK ONE]

                  (a)      / /      a beneficial interest in the:

                           (i)      / / 144A Global Note (CUSIP   ), or

                           (ii)     / / Regulation S Global Note (CUSIP   ), or

                           (iii)    / / Unrestricted Global Note (CUSIP   ); or

                  (b)      / /      a Restricted Definitive Note; or

                  (c)      / /      an Unrestricted Definitive Note,

              in accordance with the terms of the Indenture.


                                     B-105
<PAGE>   106
                                                                  EXECUTION COPY

                                    EXHIBIT C

                         FORM OF CERTIFICATE OF EXCHANGE


Birch Telecom, Inc.
1004 Baltimore Avenue, Suite 900
Kansas City, MO  64105

Norwest Bank Minnesota, National Association
Sixth and Marquette
Minneapolis, MN  55479-0069
Attention:  Corporate Trust

                  Re:  14% Senior Notes due 2008
                              (CUSIP______________)


                  Reference is hereby made to the Indenture, dated as of June
23, 1998 (the "Indenture"), between Birch Telecom, Inc., as issuer (the
"Company"), and Norwest Bank Minnesota, National Association, as trustee.
Capitalized terms used but not defined herein shall have the meanings given to
them in the Indenture.

                  ____________, (the "Owner") owns and proposes to exchange the
Note[s] or interest in such Note[s] specified herein, in the principal amount of
$____________ in such Note[s] or interests (the "Exchange"). In connection with
the Exchange, the Owner hereby certifies that:

1. EXCHANGE OF RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS IN A
RESTRICTED GLOBAL NOTE FOR UNRESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS
IN AN UNRESTRICTED GLOBAL NOTE

                  (a) / / CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST IN A
RESTRICTED GLOBAL NOTE TO BENEFICIAL INTEREST IN AN UNRESTRICTED GLOBAL NOTE. In
connection with the Exchange of the Owner's beneficial interest in a Restricted
Global Note for a beneficial interest in an Unrestricted Global Note in an equal
principal amount, the Owner hereby certifies (i) the beneficial interest is
being acquired for the Owner's own account without transfer, (ii) such Exchange
has been effected in compliance with the transfer restrictions applicable to the
Global Notes and pursuant to and in accordance with the United States Securities
Act of 1933, as amended (the "Securities Act"), (iii) the restrictions on
transfer contained in the Indenture and the Private Placement Legend are not
required in order to maintain compliance with the Securities Act and (iv) the
beneficial interest in an Unrestricted Global Note is being acquired in
compliance with any applicable blue sky securities laws of any state of the
United States.

                  (b) / / CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST IN A
RESTRICTED GLOBAL NOTE TO UNRESTRICTED DEFINITIVE NOTE. In connection with the
Exchange of the Owner's beneficial interest in a Restricted Global Note for an
Unrestricted Definitive Note, the Owner hereby certifies (i) the Definitive Note
is being acquired for the Owner's own account without transfer, (ii) such
Exchange has been effected in compliance with the transfer restrictions
applicable to the Restricted Global Notes


                                     A2-106
<PAGE>   107
and pursuant to and in accordance with the Securities Act, (iii) the
restrictions on transfer contained in the Indenture and the Private Placement
Legend are not required in order to maintain compliance with the Securities Act
and (iv) the Definitive Note is being acquired in compliance with any applicable
blue sky securities laws of any state of the United States.

                  (c) / / CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTE
TO BENEFICIAL INTEREST IN AN UNRESTRICTED GLOBAL NOTE. In connection with the
Owner's Exchange of a Restricted Definitive Note for a beneficial interest in an
Unrestricted Global Note, the Owner hereby certifies (i) the beneficial interest
is being acquired for the Owner's own account without transfer, (ii) such
Exchange has been effected in compliance with the transfer restrictions
applicable to Restricted Definitive Notes and pursuant to and in accordance with
the Securities Act, (iii) the restrictions on transfer contained in the
Indenture and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act and (iv) the beneficial interest is being
acquired in compliance with any applicable blue sky securities laws of any state
of the United States.

                  (d) / / CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTE
TO UNRESTRICTED DEFINITIVE NOTE. In connection with the Owner's Exchange of a
Restricted Definitive Note for an Unrestricted Definitive Note, the Owner hereby
certifies (i) the Unrestricted Definitive Note is being acquired for the Owner's
own account without transfer, (ii) such Exchange has been effected in compliance
with the transfer restrictions applicable to Restricted Definitive Notes and
pursuant to and in accordance with the Securities Act, (iii) the restrictions on
transfer contained in the Indenture and the Private Placement Legend are not
required in order to maintain compliance with the Securities Act and (iv) the
Unrestricted Definitive Note is being acquired in compliance with any applicable
blue sky securities laws of any state of the United States.

2. EXCHANGE OF RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS IN RESTRICTED
GLOBAL NOTES FOR RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS IN
RESTRICTED GLOBAL NOTES

                  (a) / / CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST IN A
RESTRICTED GLOBAL NOTE TO RESTRICTED DEFINITIVE NOTE. In connection with the
Exchange of the Owner's beneficial interest in a Restricted Global Note for a
Restricted Definitive Note with an equal principal amount, the Owner hereby
certifies that the Restricted Definitive Note is being acquired for the Owner's
own account without transfer. Upon consummation of the proposed Exchange in
accordance with the terms of the Indenture, the Restricted Definitive Note
issued will continue to be subject to the restrictions on transfer enumerated in
the Private Placement Legend printed on the Restricted Definitive Note and in
the Indenture and the Securities Act.

                  (b) / / CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTE
TO BENEFICIAL INTEREST IN A RESTRICTED GLOBAL NOTE. In connection with the
Exchange of the Owner's Restricted Definitive Note for a beneficial interest in
the [CHECK ONE] / / 144A Global Note, / / Regulation S Global Note, with an
equal principal amount, the Owner hereby certifies (i) the beneficial interest
is being acquired for the Owner's own account without transfer and (ii) such
Exchange has been effected in compliance with the transfer restrictions
applicable to the Restricted Global Notes and pursuant to and in accordance with
the Securities Act, and in compliance with any applicable blue sky securities
laws of any state of the United States. Upon consummation of the proposed
Exchange in accordance with the terms of the Indenture, the beneficial interest
issued will be subject to the restrictions on transfer enumerated in the Private
Placement Legend printed on the relevant Restricted Global Note and in the
Indenture and the Securities Act.


                                     C-107
<PAGE>   108
                  This certificate and the statements contained herein are made
for your benefit and the benefit of the Company.


                                              [Insert Name of Owner]

                                      By:
                                      Name:
                                     Title:

Dated: ________________, ____


                                     C-108
<PAGE>   109
                                                                  EXECUTION COPY

                                    EXHIBIT D

                            FORM OF CERTIFICATE FROM
                   ACQUIRING INSTITUTIONAL ACCREDITED INVESTOR


Birch Telecom, Inc.
1004 Baltimore Avenue
Suite 900
Kansas City, MO  64105

Norwest Bank Minnesota, National Association
Sixth and Marquette
Minneapolis, MN 55479-0069
Attention:  Corporate Trust

         Re:  14% Senior Notes due 2008

         Reference is hereby made to the Indenture, dated as of June 23, 1998
(the "Indenture"), between Birch Telecom, Inc., as issuer (the "Company") and
Norwest Bank Minnesota, National Association, as trustee. Capitalized terms used
but not defined herein shall have the meanings given to them in the Indenture.

         In connection with our proposed purchase of $______________ aggregate
principal amount of a Definitive Note, we confirm that:

1.       we are an "accredited investor" within the meaning of Rule 501(a)(1),
         (2), (3) or (7) under the Securities Act of 1933, as amended (the
         "Securities Act"), or an entity in which all of the equity owners are
         accredited investors within the meaning of Rule (501)(a)(1), (2), (3)
         or (7) under the Securities Act (an "institutional accredited
         investor");

2.       (A) any purchase of the Notes by us will be for our own account or for
         the account of one or more other institutional accredited investors or
         as fiduciary for the account of one or more trusts, each of which is an
         "accredited investor" within the meaning of Rule 501(a)(7) under the
         Securities Act and for each of which we exercise sole investment
         discretion or (B) we are a "bank," within the meaning of Section
         3(a)(2) of the Securities Act, or a "savings and loan association" or
         other institution described in Section 3(a)(5)(A) of the Securities Act
         that is acquiring Notes as fiduciary for the account of one or more
         institutions for which we exercise sole investment discretion;

3.       in the event that we purchase any Notes, we will acquire Notes having a
         minimum purchase price of not less than $250,000 for our own account
         and for each separate account for which we are acting;

4.       we have such knowledge and experience in financial and business matters
         that we are capable of evaluating the merits and risks of purchasing
         Notes;

5.       we are not acquiring the Notes with a view to any distribution thereof
         in a transaction


                                     A2-109
<PAGE>   110
         that would violate the Securities Act or the securities laws of any
         state of the United States or any other applicable jurisdictions,
         provided that the disposition of our property and the property of any
         accounts for which we are acting as fiduciary shall remain at all times
         within our control;

6.       we acknowledge that we have had access to such financial and other
         information, and have been afforded the opportunity to ask such
         questions of representatives of the Company and receive answers
         thereto, as we deem necessary in connection with our decision to
         purchase the Notes;

7.       (A) we are not a pension or welfare plan (as defined in Section 3 of
         the Employee Retirement Income Security Act of 1974, as amended
         ("ERISA")) or plan (as defined in Section 4975 of the Internal Revenue
         Code of 1986, as amended (the "Code")) (collectively, a "Plan") and we
         are not purchasing (and will not hold) the Notes on behalf of, or with
         the assets of, any such plan; or (B) our purchase and holding of the
         Notes are completely covered by the full exemptive relief provided by
         U.S. Department of Labor Prohibited Transaction Class Exemption 96-23,
         95-60, 91-38, 90-1 or 84-14; or are permitted to the extent that the
         Plan is a governmental plan (as defined in Section 3 of ERISA) which is
         not subject to the provisions of Title I of ERISA or Section 4975 of
         the Code; and

8.       if we are, or are acting on behalf of, a trust established under a
         Plan: we are aware of and have taken into consideration our fiduciary
         duties including the diversification requirements of Section
         404(a)(1)(c) of ERISA; we have concluded that the proposed investment
         in the Notes is a prudent one; the fiduciary trustee or other person
         purchasing the Notes on our behalf is independent of the Company; the
         investment in the Notes is in accordance with all requirements
         applicable to the Plan under its governing instruments and under ERISA;
         and we acknowledge and agree that the Company is not a "fiduciary"
         (within the meaning of "Section 3(21) of ERISA) with respect to any
         assets of the Plan by reason of our investment in the Notes and that we
         have not and are not relying on the Company to provide, and it has not
         provided, any kind of investment advice with respect to our investment.

                  We understand that the Notes are being offered in a
transaction not involving any public offering within the United States within
the meaning of the Securities Act and that the Notes have not been registered
under the Securities Act. We agree on our own behalf and on behalf of any
investor account for which we are purchasing the Notes, to offer, sell or
otherwise transfer such Notes prior to (x) the date which is two years (or such
shorter period of time as permitted by Rule 144(k) under the Securities Act or
any successor provision thereunder) after the later of the date of the original
issue of the Notes and the last date on which the Company or any affiliate of
the Company was the owner of such Notes (or any predecessor thereto) or (y) such
later date, if any, as may be required by applicable law only (a) to the
Company, (b) pursuant to a registration statement which has been declared
effective under the Securities Act, (c) for so long as the Notes are eligible
for resale pursuant to Rule 144A, to a person we reasonably believe is a QIB,
that purchases for its own account or for the account of a QIB to whom notice is
given that the transfer is being made in reliance on Rule 144A, (d) pursuant to
offers and sales to non-U.S. persons that occur outside the United States within
the meaning of Regulation S under the Securities Act or (e) pursuant to any
other available exemption from the registration requirements of the Securities
Act, subject in each of the foregoing cases to any


                                     D-110
<PAGE>   111
requirements of law that the disposition of our property or the property of such
investor account or accounts be at all times within our control and in
compliance with any applicable state securities laws. We further agree to
provide any person purchasing any of the Notes other than pursuant to clause (b)
above from us a notice advising such purchaser that resales of such securities
are restricted as stated herein. We understand that the Trustee and the
Registrar for the Notes will not be required to accept for registration of
transfer any Notes, except upon presentation of evidence satisfactory to the
Company that the foregoing restrictions on transfer have been complied with. We
further understand that any Notes will be in the form of definitive physical
certificates and that such certificates will bear a legend reflecting the
substance of this paragraph.

                  THIS LETTER SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE
WITH, THE LAW OF THE STATE OF NEW YORK.

                  You and the Company are entitled to rely upon this letter and
are irrevocably authorized to produce this letter or a copy hereof to any
interested party in any administrative or legal proceedings or official inquiry
with respect to the matters covered hereby.



                                     [Insert Name of Accredited Investor]



By:

Name:
                                     Title:

Dated:                     ,


                                     D-111
<PAGE>   112
                                                                  EXECUTION COPY

                                    EXHIBIT E

                          FORM OF NOTATION OF GUARANTEE


                  For value received, each Guarantor (which term includes any
successor Person under the Indenture) has, jointly and severally,
unconditionally guaranteed, to the extent set forth in the Indenture and subject
to the provisions in the Indenture dated as of June 23, 1998 (the "Indenture")
among BIRCH TELECOM, INC., the Guarantors listed on Schedule I thereto and
NORWEST BANK MINNESOTA, NATIONAL ASSOCIATION, as trustee (the "Trustee"), (a)
the due and punctual payment of the principal of, premium, if any, Liquidated
Damages, if any, and interest on the Notes (as defined in the Indenture),
whether at maturity, by acceleration, redemption or otherwise, the due and
punctual payment of interest on overdue principal and premium, and, to the
extent permitted by law, interest, and the due and punctual performance of all
other obligations of the Company to the Holders or the Trustee all in accordance
with the terms of the Indenture and (b) in case of any extension of time of
payment or renewal of any Notes or any of such other obligations, that the same
will be promptly paid in full when due or performed in accordance with the terms
of the extension or renewal, whether at stated maturity, by acceleration or
otherwise. The obligations of the Guarantors to the Holders of Notes and to the
Trustee pursuant to the Note Guarantee and the Indenture are set forth in the
Indenture, as supplemented and amended from time to time, and reference is
hereby made to the Indenture for the terms of the Note Guarantee.

                                            [Name of Guarantor(s)]




                                       By:
                                      Name:
                                     Title:


                                     E-112
<PAGE>   113
                                                                  EXECUTION COPY

                                    EXHIBIT F

                         FORM OF SUPPLEMENTAL INDENTURE
                    TO BE DELIVERED BY SUBSEQUENT GUARANTORS


                  SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"), dated
as of ________________, among __________________ (the "Guaranteeing
Subsidiary"), a subsidiary of BIRCH TELECOM, INC. (or its permitted successor),
a Delaware corporation (the "Company"), the Company, the other Guarantors (as
defined in the Indenture referred to herein) and NORWEST BANK MINNESOTA,
NATIONAL ASSOCIATION, as trustee under the Indenture referred to below (the
"Trustee").

                               W I T N E S S E T H

                  WHEREAS, the Company has heretofore executed and delivered to
the Trustee an indenture (as supplemented and amended, the "Indenture"), dated
as of June 23, 1998 providing for the issuance of an aggregate principal amount
of up to $115,000,000 of 14% Senior Notes due 2008 (the "Notes");

                  WHEREAS, the Indenture provides that under certain
circumstances the Guaranteeing Subsidiary shall execute and deliver to the
Trustee a supplemental indenture pursuant to which the Guaranteeing Subsidiary
shall unconditionally guarantee all of the Company's Obligations under the Notes
and the Indenture on the terms and conditions set forth herein (the "Note
Guarantee"); and

                  WHEREAS, pursuant to Section 9.01 of the Indenture, the
Trustee is authorized to execute and deliver this Supplemental Indenture.

                  NOW THEREFORE, in consideration of the foregoing and for other
good and valuable consideration, the receipt of which is hereby acknowledged,
the Guaranteeing Subsidiary and the Trustee mutually covenant and agree for the
equal and ratable benefit of the Holders of the Notes as follows:

                  1. Capitalized Terms. Capitalized terms used herein without
definition shall have the meanings assigned to them in the Indenture.

                  2. Agreement to Guarantee. The Guaranteeing Subsidiary hereby
agrees as follows:

                  (a)      Along with all Guarantors named in the Indenture, to
                           jointly and severally Guarantee to each Holder of a
                           Note authenticated and delivered by the Trustee and
                           to the Trustee and its successors and assigns,
                           irrespective of the validity and enforceability of
                           the Indenture, the Notes or the obligations of the
                           Company hereunder or thereunder, that:

                           (i)      the principal of, premium, if any,
                                    Liquidated Damages, if any, and interest on
                                    the Notes will be promptly paid in full when
                                    due, whether at maturity, by acceleration,
                                    redemption or otherwise, and interest on the
                                    overdue principal of and interest on the
                                    Notes, if any, if lawful, and all other
                                    obligations of the Company to the Holders or
                                    the Trustee


                                     F-113
<PAGE>   114
                                    hereunder or thereunder will be promptly
                                    paid in full or performed, all in accordance
                                    with the terms hereof and thereof; and

                           (ii)     in case of any extension of time of payment
                                    or renewal of any Notes or any of such other
                                    obligations, that same will be promptly paid
                                    in full when due or performed in accordance
                                    with the terms of the extension or renewal,
                                    whether at stated maturity, by acceleration
                                    or otherwise. Failing payment when due of
                                    any amount so guaranteed or any performance
                                    so guaranteed for whatever reason, the
                                    Guarantors shall be jointly and severally
                                    obligated to pay the same immediately.

                  (b)      The obligations hereunder shall be unconditional,
                           irrespective of the validity, regularity or
                           enforceability of the Notes or the Indenture, the
                           absence of any action to enforce the same, any waiver
                           or consent by any Holder of the Notes with respect to
                           any provisions hereof or thereof, the recovery of any
                           judgment against the Company, any action to enforce
                           the same or any other circumstance which might
                           otherwise constitute a legal or equitable discharge
                           or defense of a guarantor.


                  (c)      The following is hereby waived: diligence,
                           presentment, demand of payment, filing of claims with
                           a court in the event of insolvency or bankruptcy of
                           the Company, any right to require a proceeding first
                           against the Company, protest, notice and all demands
                           whatsoever.


                  (d)      This Note Guarantee shall not be discharged except by
                           complete performance of the obligations contained in
                           the Notes and the Indenture.


                  (e)      If any Holder or the Trustee is required by any court
                           or otherwise to return to the Company, the
                           Guarantors, or any custodian, Trustee, liquidator or
                           other similar official acting in relation to either
                           the Company or the Guarantors, any amount paid by
                           either to the Trustee or such Holder, this Note
                           Guarantee, to the extent theretofore discharged,
                           shall be reinstated in full force and effect.


                  (f)      The Guaranteeing Subsidiary shall not be entitled to
                           any right of subrogation in relation to the Holders
                           in respect of any obligations guaranteed hereby until
                           payment in full of all obligations guaranteed hereby.


                  (g)      As between the Guarantors, on the one hand,
                           and the Holders and the Trustee, on the other hand,
                           (x) the maturity of the obligations guaranteed hereby
                           may be accelerated as provided in Article 6 of the
                           Indenture for the purposes of this Note Guarantee,
                           notwithstanding any stay, injunction or other
                           prohibition preventing such acceleration in respect
                           of the obligations guaranteed hereby, and (y) in the
                           event of any declaration of acceleration of such
                           obligations as provided in Article 6 of the
                           Indenture, such obligations (whether or not due and
                           payable) shall forthwith become due and payable by
                           the Guarantors for the purpose of this Note
                           Guarantee.


                  (h)      The Guarantors shall have the right to seek
                           contribution from any non-paying 


                                     F-114
<PAGE>   115
                           Guarantor so long as the exercise of such right does
                           not impair the rights of the Holders under the
                           Guarantee.


                  (i)      For purposes hereof, each Guarantor's liability shall
                           be limited to the lesser of (i) the aggregate amount
                           of the Obligations of the Company under the Notes and
                           the Indenture and (ii) the amount, if any, which
                           would not have (A) rendered such Guarantor
                           "insolvent" (as such term is defined under Bankruptcy
                           Law, including the Debtor and Creditor Law of the
                           State of New York) or (B) left such Guarantor with
                           unreasonably small capital at the time its Guarantee
                           of the Notes was entered into; provided that, it will
                           be a presumption in any lawsuit or other proceeding
                           in which a Guarantor is a party that the amount
                           guaranteed pursuant to the Guarantee is the amount
                           set forth in clause (i) above unless any creditor, or
                           representative of creditors of such Guarantor, or
                           debtor in possession or trustee in bankruptcy of such
                           Guarantor, or proves in such a lawsuit that the
                           aggregate liability of the Guarantor is limited to
                           the amount set forth in clause (ii) above. In making
                           any determination as to the solvency or sufficiency
                           of capital of a Guarantor in accordance with the
                           previous sentence, the right of such Guarantors to
                           contribution from other Guarantors as set forth in
                           the Indenture and any other rights such Guarantors
                           may have, contractual or otherwise, shall be taken
                           into account.

                  3 EXECUTION AND DELIVERY. Each Guaranteeing Subsidiary agrees
that the Note Guarantees shall remain in full force and effect notwithstanding
any failure to endorse on each Note a notation of such Note Guarantee.

                  4. Guaranteeing Subsidiary May Consolidate, Etc. on Certain
Terms.

         (a)      The Guaranteeing Subsidiary may not consolidate with or merge
                  with or into (whether or not such Guarantor is the surviving
                  Person) another corporation, Person or entity whether or not
                  affiliated with such Guarantor unless:

                  (i)      the Person formed by or surviving any such
                           consolidation or merger (if other than a Guarantor or
                           the Company) unconditionally assumes all the
                           obligations of such Guarantor, pursuant to a
                           supplemental indenture in form and substance
                           reasonably satisfactory to the Trustee, under the
                           Notes, the Indenture and the Note Guarantee on the
                           terms set forth herein or therein; and

                  (ii)     immediately after giving effect to such transaction,
                           no Default or Event of Default exists.

         (b)      In case of any such consolidation, merger, sale or conveyance
                  and upon the assumption by the successor corporation, by
                  supplemental indenture, executed and delivered to the Trustee
                  and satisfactory in form to the Trustee, of the Note Guarantee
                  endorsed upon the Notes and the due and punctual performance
                  of all of the covenants and conditions of the Indenture to be
                  performed by the Guarantor, such successor corporation shall
                  succeed to and be substituted for the Guarantor with the same
                  effect as if it had been named herein as a Guarantor. Such
                  successor corporation thereupon may cause to be signed any or
                  all of the Note Guarantees to be endorsed upon all of the
                  Notes issuable hereunder which theretofore shall not have been
                  signed by the Company and delivered to the Trustee. All


                                     F-115
<PAGE>   116
                  the Note Guarantees so issued shall in all respects have the
                  same legal rank and benefit under the Indenture as the Note
                  Guarantees theretofore and thereafter issued in accordance
                  with the terms of the Indenture as though all of such Note
                  Guarantees had been issued at the date of the execution
                  hereof.

         (c)      Except as set forth in Articles 4 and 5 of the Indenture, and
                  notwithstanding clauses (a) and (b) above, nothing contained
                  in the Indenture or in any of the Notes shall prevent any
                  consolidation or merger of a Guarantor with or into the
                  Company or another Guarantor, or shall prevent any sale or
                  conveyance of the property of a Guarantor as an entirety or
                  substantially as an entirety to the Company or another
                  Guarantor.

                  5. RELEASES.

         (a)      In the event of a sale or other disposition of all of the
                  assets of any Guarantor, by way of merger, consolidation or
                  otherwise, or a sale or other disposition of all to the
                  capital stock of any Guarantor, then such Guarantor (in the
                  event of a sale or other disposition, by way of merger,
                  consolidation or otherwise, of all of the capital stock of
                  such Guarantor) or the corporation acquiring the property (in
                  the event of a sale or other disposition of all or
                  substantially all of the assets of such Guarantor) will be
                  released and relieved of any obligations under its Note
                  Guarantee; provided that the Net Proceeds of such sale or
                  other disposition are applied in accordance with the
                  applicable provisions of the Indenture, including without
                  limitation Section 4.10 of the Indenture. Upon delivery by the
                  Company to the Trustee of an Officers' Certificate and an
                  Opinion of Counsel to the effect that such sale or other
                  disposition was made by the Company in accordance with the
                  provisions of the Indenture, including without limitation
                  Section 4.10 of the Indenture, the Trustee shall execute any
                  documents reasonably required in order to evidence the release
                  of any Guarantor from its obligations under its Note
                  Guarantee.

         (b)      Any Guarantor not released from its obligations under its Note
                  Guarantee shall remain liable for the full amount of principal
                  of and interest on the Notes and for the other obligations of
                  any Guarantor under the Indenture as provided in Article 10 of
                  the Indenture.

                  6. NO RECOURSE AGAINST OTHERS. No past, present or future
director, officer, employee, incorporator, stockholder or agent of the
Guaranteeing Subsidiary, as such, shall have any liability for any obligations
of the Company or any Guaranteeing Subsidiary under the Notes, any Note
Guarantees, the Indenture or this Supplemental Indenture or for any claim based
on, in respect of, or by reason of, such obligations or their creation. Each
Holder of the Notes by accepting a Note waives and releases all such liability.
The waiver and release are part of the consideration for issuance of the Notes.

                  7. NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF
NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE AND
THE NOTE GUARANTEES.

                  8. COUNTERPARTS The parties may sign any number of copies of
this Supplemental Indenture. Each signed copy shall be an original, but all of
them together represent the same agreement.

                  9. EFFECT OF HEADINGS. The Section headings herein are for
convenience only and shall not affect the construction hereof.


                                     F-116
<PAGE>   117
                  10. THE TRUSTEE. The Trustee shall not be responsible in any
manner whatsoever for or in respect of the validity or sufficiency of this
Supplemental Indenture or for or in respect of the recitals contained herein,
all of which recitals are made solely by the Guaranteeing Subsidiary and the
Company.


                                     F-117
<PAGE>   118
                  IN WITNESS WHEREOF, the parties hereto have caused this
         Supplemental Indenture to be duly executed and attested, all as of the
         date first above written.

Dated:  _______________, ____

                                     [Guaranteeing Subsidiary]


                                     By:
                                        Name:
                                        Title:


                                     [COMPANY]


                                     By:
                                        Name:
                                        Title:


                                     [EXISTING GUARANTORS]


                                     By:
                                        Name:
                                        Title:


                                     [TRUSTEE]
                                        as Trustee


                                     By:
                                        Name:
                                        Title:


                                     F-118

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