Document:

<PAGE>   1

                                   EXHIBIT 4.1
                             SUBSCRIPTION AGREEMENT

        THIS SUBSCRIPTION AGREEMENT (the "Agreement") is made as of the day of
July, 2000, by and among SONUS COMMUNICATION HOLDINGS, INC., a Delaware
corporation ("Sonus" or the "Company"), and the investors who complete and
return to Sonus the attached Schedule A, which is expressly made a part hereof
(the "Investors").

                               W I T N E S S E T H

        WHEREAS, the Company desires to sell to the Investors up to 5,000,000
Units (the "Units" as defined in Section 1 below) offered by the Company,
subject to the terms and conditions set forth herein; and

        WHEREAS, the Investors desire to purchase such Units;

        NOW, THEREFORE, in consideration for the mutual covenants and agreements
set forth herein, and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto hereby agree as
follows:

        1. Unit. Each Unit sold hereunder shall include two shares of the common
stock of the Company, par value $.0001 per share (the "Common Stock") and one
common stock purchase warrant, which entitles the holder to purchase one share
of the Common Stock for $.60 per share (the "Warrant"), as adjusted in
accordance with the terms of the Warrant.

        2. Purchase and Sale of Units.

               a. Sale and Issuance.Subject to the terms and conditions of this
Agreement and the Private Placement Memorandum dated July 5, 2000 to which this
Agreement is attached (the "PPM"), each Investor agrees, severally but not
jointly, to purchase at the Closing (as hereinafter defined), and Sonus agrees
to sell and issue at the Closing, the number of Units set forth on the
Investor's signature page, attached hereto as Schedule A, for the purchase price
of 60/100 Dollar ($.60) per Unit, to be paid by check, subject to collection, or
wire transfer, from Investor and delivered to Sonus upon execution and delivery
hereof by Investor.

               b. Maximum Offering. The offering of the Units ("Offering") shall
be conducted by Sonus. There is no minimum subscription for Units or minimum
aggregate offering. The maximum subscription is 5,000,000 Units, or $3,000,000.
Subject to the foregoing, closings will be held at the discretion of the
Company, upon receipt of subscriptions and acceptance thereof by Sonus. An
executed copy of this Subscription Agreement, and a statement of accredited
investor, together with the purchase price, should be returned to the Company.
All funds will be held at Commercial Bank of New York, pending Closing, and will
be returned in full, without interest, if Sonus rejects a subscription or
terminates the Offering. This Offering shall terminate on July 27, 2000, unless
extended by the Company in its sole discretion (the "Termination Date").

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               c. Closings. The purchase and sale of the Units shall take place
at a closing at the office of the Company, 254 West 31st Street, 3rd Floor, New
York, New York 10001, upon receipt of acceptable subscriptions by Sonus, or at
such other time and place as Sonus may designate (the "Closing"); provided that
all Closings shall take place no later than the Termination Date. At the
Closing, Sonus shall accept the subscription payments against delivery to its
transfer agent of irrevocable instructions directing the transfer agent to issue
to the Investors certificates representing the portion of their Units comprised
of Common Stock and against issuance of the Warrants to Investors.

        3. Representations and Warranties of Sonus. Sonus hereby represents and
warrants to each Investor as follows:

               a. Organization, Good Standing and Qualification. Sonus is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware, and has all requisite power and authority to carry on
its business as now conducted. Sonus is duly qualified to transact business, and
is in good standing, in each jurisdiction in which the failure to so qualify
would have a material adverse effect on its business.

               b. Capitalization.  The authorized capital of Sonus consists of
100,000,000 shares of Common Stock, par value $.0001, of which 7,398,071 are
issued and outstanding, not including any options, warrants or convertible
securities.

               c. Authorization. All corporate action on the part of the Company
necessary for the authorization, execution and delivery of this Agreement, the
performance of all obligations of the Company hereunder and the authorization,
issuance and delivery of the Units, to the extent that the foregoing requires
performance on or prior to the Closing, has been taken or will be taken on or
prior to the Closing, and the Company has all requisite corporate power and
authority to enter into this Agreement.

        4. Representations and Warranties of Investors.  Each Investor hereby
represents and warrants to Sonus as follows:

               a. Power and Authority; Binding Obligation. Investor has full
power and authority to enter into this Agreement. This Agreement has been duly
executed and delivered by Investor and, assuming due authorization, execution
and delivery by Sonus, constitutes Investor's valid and legally binding
obligation enforceable against the Investor in accordance with its terms,
subject to the effect of any applicable bankruptcy, reorganization, insolvency
(including, without limitation, all laws relating to fraudulent transfers),
moratorium or similar laws affecting creditors' rights generally, subject, as to
enforceability, to the effect of general principles of equity (regardless of
whether such enforceability is considered in a proceeding in equity or at law)
and subject to the effect of applicable securities laws as to rights of
indemnification.

               b. Purchase Entirely for Own Account, Etc.. The Units to be
purchased by Investor hereunder will be acquired for investment for Investor's
own account, not as a nominee

                                                                              19
<PAGE>   3

or agent, and not with a view to the resale or distribution of any part thereof.
Investor has no present intention of selling, granting any participation in, or
otherwise distributing the Units. Investor does not have any contract,
undertaking, agreement or arrangement with any person to sell, transfer or grant
participations to any person with respect to the Units. The Investor has not
construed the contents of this Agreement, or any additional agreement with
respect to the proposed investment in the Units or any prior or subsequent
communications from Sonus, or any of its officers, employees or representatives,
as investment, tax or legal advice, or as information necessarily applicable to
such Investor's particular financial situation. The Investor has consulted its
own financial advisor, tax advisor, legal counsel and accountant, as necessary
or desirable, as to matters concerning his investment in the Units.

               c. Disclosure. Investor has received or reviewed all the
information which such Investor has requested for the purposes of determining
the merits of the Units as an investment. Investor has read and understands the
PPM. Investor has also received and reviewed a copy of the Company's audited
financial statements for the fiscal year ended December 31, 1999 and the
Amendment No. 1 to Form SB-2 filed on March 22, 2000. Investor has had an
opportunity to ask questions and receive answers from the Company regarding the
Company, its business, and the terms and conditions of the offering of Units.
INVESTOR ACKNOWLEDGES AND AGREES THAT THE PURCHASE OF THE UNITS INVOLVES A HIGH
DEGREE OF RISK, INCLUDING, WITHOUT LIMITATION, THOSE SET FORTH IN THE PPM, AND
MAY RESULT IN A LOSS OF THE ENTIRE AMOUNT INVESTED. THERE IS NO ASSURANCE THAT
THE COMPANY'S OPERATIONS WILL BE PROFITABLE IN THE FUTURE OR THAT ANY PUBLIC
MARKET FOR THE UNITS WILL BE AVAILABLE.

               d. Accredited Investor. Investor is an accredited investor as
defined in Rule 501(a) of Regulation D under the Securities Act of 1933, as
amended ("Securities Act"). The information provided by Investor on the
Statement of Accredited Investor is true and correct in all respects. Investor
is capable of bearing the economic risk of an investment in the Units, including
the possible loss of Investor's entire investment. Investor has such knowledge
and experience in financial or business matters that it is capable of evaluating
the merits and risks of an investment in the Units offered hereby. If other than
an individual, Investor has not been organized solely for the purpose of
acquiring the Units.

               e. Restricted Securities. Investor understands that the Units
being purchased hereunder are "restricted securities" as defined in the
Securities Act, and that under federal and state securities laws the Units may
be resold without registration under the Securities Act only in certain limited
circumstances. The Company has agreed to file a registration statement with the
Securities and Exchange Commission (the "Commission") within 30 days after the
Closing of this Offering with respect to the resale of the Units, but there can
be no assurance that such registration statement will become effective and such
registration statement shall cover only the number shares of Common Stock which
the Investors requests to have registered within five days after the Closing.
Investor is familiar with Rule 144 promulgated by the Commission under the
Securities Act, and understands the resale limitations imposed thereby and by
the Securities Act generally. Investor also acknowledges that the Units are
subject to significant restrictions on transfer, pledge or hypothecation in the
manner described in the PPM.

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<PAGE>   4

               f. Legends. It is understood that certificates or other evidence
of the Units may bear the following legend, as well as any legend required by
the laws of any state:

               "THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
               ACT OF 1933, AS AMENDED. THEY MAY NOT BE SOLD, OFFERED FOR SALE,
               PLEDGED OR HYPOTHECATED IN THE ABSENCE OF A REGISTRATION
               STATEMENT IN EFFECT WITH RESPECT TO THE SECURITIES UNDER SUCH ACT
               OR AN OPINION OF COUNSEL SATISFACTORY TO THE ISSUER THAT SUCH
               REGISTRATION IS NOT REQUIRED PURSUANT TO A VALID EXEMPTION
               THEREFROM UNDER THE SECURITIES ACT OF 1933, AS AMENDED."

               g. Consents and Approvals; No Conflict. (i) The execution and
delivery of this Agreement by the Investor does not, and the performance of this
Agreement by the Investor will not, require any consent, approval, authorization
or other action by, or filing with or notification to, any governmental or
regulatory authority, except where failure to obtain such consent, approval,
authorization or action, or to make such filing or notification, would prevent
Investor from performing any of its material obligations under this Agreement.

                      (ii) The execution, delivery and performance of this
Agreement by the Investor does not (A) in the case of any Investor that is not
an individual, conflict with or violate the charter or by-laws, partnership or
other governing documents of such Investor, or (B) except as would not have a
material adverse effect on the ability of the Investor to consummate the
transactions contemplated by this Agreement, conflict with or violate any law,
rule, regulation, order, writ, judgment, injunction, decree, determination or
award applicable to the Investor.

        5.  Covenants of Investors.  Each Investor hereby covenants with Sonus
as follows:

               a.  Limitations on Disposition.  Investor shall not make any
disposition of all or any portion of the Units unless and until such proposed
disposition shall in all respects comply with the terms and conditions of the
PPM, and, in addition thereto:

                      i. There is then in effect a registration statement under
the Securities Act covering such proposed disposition, and such disposition is
made in accordance with such registration statement; or

                      ii. Such Investor shall have notified Sonus of the
proposed disposition and shall have furnished Sonus with a detailed statement of
the circumstances surrounding the proposed disposition, and, if requested by
Sonus, such Investor shall have furnished the Company with an opinion of
counsel, in form and substance satisfactory to Sonus, that such disposition will
not require registration of the Units under the Securities Act.

               b. Confidentiality. Investor shall maintain in confidence, and
shall not use or disclose without the prior written consent of Sonus, any
information that is furnished to it by the

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Company or its agents in connection with this Agreement. This obligation of
confidentiality shall not apply, however, to any information (i) in the public
domain through no unauthorized act or failure to act by any Investor, (ii)
lawfully disclosed to such Investor by a third party who possessed such
information without any obligation of confidentiality, (iii) known previously by
such Investor or lawfully developed by such Investor independent of any
disclosure by Sonus or its agents or (iv) disclosed to legal or financial
advisors in the ordinary course of evaluating this investment; provided,
however, that such advisors agree to be bound by the provisions of this Section
5.b. Investor shall return to Sonus all materials containing such information
upon request by Sonus in the event that Investor's subscription is not accepted
by Sonus.

        6. Conditions of Investor's Obligations at Closing. The obligations of
each Investor hereunder are subject to, and contingent upon, the fulfillment, on
or before each Closing, of each of the following conditions, the waiver of which
shall not be effective against any Investor who does not consent in writing
thereto:

               a. Representations and Warranties. The representations and
warranties of Sonus contained in Section 3 hereof shall be true and correct on
and as of the Closing with the same effect as though such representations and
warranties had been made on and as of the date of such Closing.

               b. Performance. Sonus shall have performed and complied with all
agreements, obligations and covenants contained in this Agreement that are
required to be performed or complied with by it on or before the Closing;
provided that the obligations of the Investors shall not be subject to or
contingent upon the issuance by Sonus of the Units to the persons or entities
who submit the attached Schedule A who have not performed or tendered the
performance of their obligations required to be performed under this Agreement
on or prior to the Closing.

        7.  Conditions of Sonus's Obligations at Closing.  The obligations of
Sonus to each Investor hereunder are subject to and contingent upon the
fulfillment by such Investor, on or before the Closing, of each of the following
conditions:

               a. Representations and Warranties. The representations and
warranties of each Investor contained herein shall be true and correct on and as
of the Closing with the same effect as though such representations and
warranties had been made on and as of the date of such Closing.

               b.  Payment of Purchase Price by Investors.  Each Investor shall
have delivered to Sonus the purchase price specified in Schedule A attached
hereto, in the manner specified in Section 2 hereof.

               c.  Statement of Accredited Investor.  Each Investor shall have
delivered to Sonus the Statement of Accredited Investor in the form set forth in
Schedule B attached hereto, and the information provided therein shall be
complete and correct on and as of the Closing with the same effect as though
such information had been provided as of the date of such Closing.

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<PAGE>   6

        8. Registration Rights. (a) The Company will, at its expense, within 30
days of the date of the final Closing, file with the Commission an amendment to
the Registration Statement on SB-2 currently on file with the Commission or file
another Registration Statement on the appropriate form seeking to permit the
resale without restriction of the Shares sold in this Offering (the "SEC
Filing") to the extent the Investor has requested such Shares be included in
such registration within 5 days after the date of the final Closing.

        (b) The obligation of the Company under this Section 8 shall be
limited to one (1) registration statement. If any registration pursuant to this
Section 8(b) shall be underwritten in whole or in part, the Company may require
that the Shares requested for inclusion pursuant to this Section 8(b) be
included in the underwriting on the same terms and conditions as the securities
otherwise being sold through the underwriters. In the event that the Shares
requested for inclusion pursuant to this Section 8(b) together with any other
shares would, in the good faith judgment of the managing underwriter of such
public offering, reduce the number of shares to be offered by the Company or
interfere with the successful marketing of the securities offered by the
Company, the Company will include in such registration such Shares of each
Investor which is pro rata, based on the number of securities which in the
opinion of such underwriters can be sold and on the number of securities which
all Investors request be included in the registration. The rights of all
Investors under this Section 8(b) shall terminate at such time as the Investors
may sell all of their Shares without restriction or limitation either under Rule
144 or under any other exemption from registration under the Securities Act or
as the Shares are registered for resale with the Commission.

        (c) With respect to each registration statement prepared and filed
pursuant to this Section 8(a) and each inclusion of Shares in a registration
statement pursuant to Section 8(b) hereof, the fees, costs and expenses of
registration to be borne by the Company shall include all registration expenses.
With respect to any registration, the Investor shall bear his, her or its
respective selling and legal expenses.

        9. In the case of each registration effected by the Company pursuant to
this Agreement, the Company will keep the Investors advised in writing as to the
initiation of each registration and as to the completion thereof. At its
expense, the Company will:

        (a)    Keep such registration effective for a period of one year or
               until the Investors have completed the distribution described in
               the registration statement relating thereto, whichever first
               occurs;

        (b)    Prepare and file with the Commission such amendments and
               supplements to such registration statement and the prospectus
               used in connection with such registration statement as may be
               necessary to reflect facts or events representing material or
               fundamental change in the information set forth therein or
               otherwise necessary to comply with the provisions of the
               Securities Act with respect to the disposition of all securities
               covered by such registration statement;

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        (c)    Furnish such number of prospectuses and other documents incident
               thereto, including any amendment of or supplement to the
               prospectus, as an Investor from time to time may reasonably
               request;

        (d)    Notify each seller of Shares covered by such registration
               statement at any time of the happening of any event as a result
               of which the prospectus included in such registration statement,
               as then in effect, includes an untrue statement of a material
               fact or omits to state a material fact required to be stated
               therein or necessary to make the statements therein not
               misleading or incomplete in light of the circumstances then
               existing, and at the request of any such seller, prepare and
               furnish to such seller a reasonable number of copies of a
               supplement to or an amendment of such prospectus as may be
               necessary so that, as thereafter delivered to the purchasers of
               such shares, such prospectus shall not include an untrue
               statement of a material fact or omit to state a material fact
               required to be stated therein or necessary to make the statements
               therein not misleading or incomplete in the light of the
               circumstances then existing; and

        (e)    Provide a transfer agent and registrar for all Shares covered by
               such registration statement and a CUSIP number for all such
               Shares, in each case not later than the effective date of such
               registration.

        10.   Indemnification.

        a. Indemnification. The Investor agrees, if any of Investor's Shares are
included in the securities as to which such registration, qualification or
compliance is being effected, to indemnify the Company, each of its directors
and officers, each underwriter, if any, of the Company's securities covered by
such a registration statement, each Person who controls the Company or such
underwriter within the meaning of Section 15 of the Securities Act, and each
other such investor, each of its officers and directors and each Person
controlling such investor within the meaning of Section 15 of the Securities
Act, against all claims, losses, damages and liabilities (or actions in respect
thereof) arising out of or based on any untrue statement (or alleged untrue
statement) of a material fact contained in any such registration statement,
prospectus, offering circular or other document, or any omission (or alleged
omission) to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, and will reimburse the
Company, such investors, such directors, officers, Persons, underwriters or
control Persons for any legal or any other expenses reasonably incurred, as such
expenses are incurred, in connection with investigating or defending any such
claim, loss, damage, liability or action, in each case to the extent, but only
to the extent, that such untrue statement (or alleged untrue statement) or
omission (or alleged omission) is made in such registration statement,
prospectus, offering circular or other document in reliance upon and in
conformity with written information furnished to the Company by you.
Notwithstanding the foregoing, your liability under this subsection shall be
limited in an amount equal to the initial price of the Shares sold by you,
unless such liability arises out of or is based on willful misconduct by you.

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        b. Indemnification Procedure. Each party entitled to indemnification
under this Section (the "Indemnified Party") shall give notice to the party
required to provide indemnification (the "Indemnifying Party") after such
Indemnified Party has actual knowledge of any claim as to which indemnity may be
sought, and shall permit the Indemnifying Party to assume the defense of any
such claim or any litigation resulting therefrom, provided that counsel for the
Indemnifying Party, who shall conduct the defense of such claim or litigation,
shall be approved by the Indemnified Party (whose approval shall not be
unreasonably withheld), and the Indemnified Party may participate in such
defense at such party's expense, and provided further that the failure of any
Indemnified Party to give notice as provided herein shall not relieve the
Indemnifying Party of its obligations under this Agreement, unless the failure
to give such notice is materially prejudicial to an Indemnifying Party's ability
to defend such action, and provided further that the Indemnifying Party shall
not assume the defense for matters as to which there is a conflict of interest
or separate and different defenses. No Indemnifying Party, in the defense of any
such claim or litigation, shall, except with the consent of each Indemnified
Party, consent to entry of any judgment or enter into any settlement which does
not include as an unconditional term thereof the giving by the claimant or
plaintiff to such Indemnified Party of a release from all liability in respect
to such claim or litigation.

        11. Miscellaneous.

               a.  Survival of Warranties.  The representations, warranties and
covenants of the Investors contained in this Agreement shall survive the
execution and delivery of this Agreement and the Closing.

               b. Successors and Assigns. This Agreement may not be assigned by
any party hereto. The terms and conditions of this Agreement shall inure to the
benefit of, and be binding upon, the respective successors of the parties.
Nothing in this Agreement, express or implied, is intended to confer upon any
party, other than the parties hereto or their respective successors, any rights,
remedies, obligations or liabilities under or by reason of this Agreement,
except as expressly provided in this Agreement.

               c.  Governing Law.  This Agreement shall be governed by and
construed in accordance with the laws of the State of Delaware, without regard
to the principles of conflict of laws thereof.

               d.  Counterparts.  This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

               e. Titles and Subtitles.  The titles and subtitles used in this
Agreement are used for convenience only and are not to be considered in
construing or interpreting this Agreement.

               f. Notices. Unless otherwise provided, any notice required or
permitted hereunder shall be given by personal service upon the party to be
notified, by nationwide

                                                                              25

<PAGE>   9

overnight delivery service or upon deposit with the United States Post Office,
by certified mail, return receipt requested and:

                      i. if to Sonus, addressed to SONUS COMMUNICATION
HOLDINGS, INC., c/o Mr. John Friedman, 254 West 31st Street, 3rd Floor, New
York, NY 10001 with a copy to Cecil E. Martin, III, Esq., McGuireWoods LLP,
Seven Saint Paul Street, Baltimore, Maryland 21202 or at such other address as
the Company may designate by notice to each of the Investors in accordance with
the provisions of this Section 11; and

                      ii. if to the Investors, at their respective addresses
indicated on the signature pages hereof, or at such other addresses as any one
or more Investors may designate by notice to Sonus in accordance with the
provisions of this Section 11.

               g. Expenses. Irrespective of whether a Closing is effected, Sonus
and the Investors shall pay all of their own costs and expenses incurred with
respect to the negotiation, execution, delivery and performance of this
Agreement. If any action at law or in equity is necessary to enforce or
interpret the terms of this Agreement, the prevailing party shall be entitled to
reasonable attorney's fees, costs and necessary disbursements in addition to any
other relief to which such party may be entitled.

               h. Amendments and Waivers. Any term of this Agreement may be
amended and the observance of any term of this Agreement may be waived (either
generally or in a particular instance and either prospectively or
retroactively), only with the written consent of Sonus and a majority in
interest of the Investors purchasing Units in this Offering.

               i. Severability. If one or more provisions of this Agreement are
held to be unenforceable under applicable law, such provisions shall be excluded
from this Agreement and the balance of this Agreement shall be interpreted as if
such provision were so excluded, and this Agreement shall be otherwise
enforceable in accordance with its terms.

               j. Entire Agreement. This Agreement (including the exhibits and
schedules hereto) constitutes the entire agreement among the parties hereto with
respect to the subject matter hereof and supersedes all prior agreements,
understandings, negotiations and discussions, whether oral or written, of the
parties hereto.

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<PAGE>   10

        IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the date first above written.

                                            SONUS COMMUNICATION HOLDING, INC.

                                            By:
                                               --------------------------------
                                            John K. Friedman, Esq.
                                            President & Chief Operating Officer

                                            [Investor Signature Pages Follow]

                                                                              27
<PAGE>   11

SCHEDULE A

                           INVESTOR SIGNATURE PAGE FOR
                       SONUS COMMUNICATION HOLDINGS, INC.
                         COMMON STOCK PURCHASE AGREEMENT
           PLEASE PRINT OR TYPE, USE INK ONLY. (ALL PARTIES MUST SIGN)

      The undersigned investor hereby certifies that he (i) has received and
relied solely upon the Common Stock Purchase Agreement, the PPM and their
exhibits and schedules, (ii) agrees to all the terms and conditions of this
Common Stock Purchase Agreement, (iii) meets the suitability standards set forth
herein, and (iv) is a resident of the state or foreign jurisdiction indicated
below.

No. of Units Subscribed for ($.60 for each Unit): _________________________

Amount of Subscription: $________________________________

<TABLE>
<S>                                                                                    <C>    <C>
                                                                                       If other than individual check one and
--------------------------------------------------------------                         indicate capacity of signatory under the
                                                                                       signature:
Name of Investor (Print)
                                                                                            [ ]  Trust
--------------------------------------------------------------                              [ ]  Estate
Name of Joint Investor (if any) (Print)                                                     [ ]  Uniform Gifts to Minors Act of
                                                                                                 State of ____________
                                                                                            [ ]  Attorney-in-fact
--------------------------------------------------------------                              [ ]  Company
Signature of Investor                                                                       [ ]  Other

--------------------------------------------------------------                          If Joint Ownership, Check one:
Signature of Joint Investor (if any)                                                        [ ]  Joint Tenants with Right of
                                                                                                 Survivorship
                                                                                            [ ]  Tenants in Common
--------------------------------------------------------------                              [ ]  Tenants by the Entirety
Capacity of Signatory (if applicable)                                                       [ ]  Community by Property

--------------------------------------------------------------                          Backup Withholding Statement:
Social Security or Taxpayer Identification Number                                           [ ]  Please check this box only if the
                                                                                                 investor is subject to backup
                                                                                                 withholding
</TABLE>

                                                                              28

<PAGE>   12
<TABLE>
<S>                                                                                    <C>    <C>
Residence Address                                                                       Foreign Person:
                                                                                             [ ]  Please check this box only if the
                                                                                                  investor is a nonresident alien,
_________________________________________                                                         foreign Company, foreign
City             State                Zip Code                                                    partnership, foreign trust or
                                                                                                  foreign estate.

Telephone: (     )
</TABLE>

The investor agrees to the terms of this Agreement and, as required by the
Regulations pursuant to the Internal Revenue Code, certifies under penalty of
perjury that (1) the Social Security Number or Taxpayer Identification Number
and address provided above is correct, (2) the investor is not subject to backup
withholding (unless the Backup Withholding Statement box is checked) either
because he has not been notified that he is subject to backup withholding as a
result of a failure to report all interest or dividends or because the Internal
Revenue Service has notified him that he is no longer subject to backup
withholding and (3) the investor (unless, the Foreign Person box above is
checked) is not a nonresident alien, foreign partnership, foreign trust or
foreign estate.

        THE SUBSCRIPTION FOR UNITS OF SONUS COMMUNICATION HOLDINGS, INC. BY THE
ABOVE NAMED INVESTOR(S) IS ACCEPTED THIS ________DAY OF JULY, 2000.

                                    SONUS COMMUNICATION HOLDINGS, INC.

                                    By:_______________________________________
                                          John K. Friedman
                                          President & Chief Operating Officer

                                                                              29
<PAGE>   13

SCHEDULE B

                        STATEMENT OF ACCREDITED INVESTOR

To:     SONUS COMMUNICATION HOLDINGS, INC. (the "Company")

Ladies and Gentlemen:

        The undersigned hereby refers to the Common Stock Purchase Agreement
executed and delivered to the Company by the undersigned as of the date
herewith. In connection with the subscription thereunder by the undersigned to
purchase securities of the Company, the undersigned hereby represents and
warrants that such individual or entity meets at least one of the tests listed
on the attached Exhibit I for an "accredited investor" (as such term is defined
under Regulation D promulgated pursuant to the Securities Act of 1933, as
amended).

Dated:                        , 2000
        ----------------------

                                            Very truly yours,

                                            -----------------------------------
                                            Name of Individual #1 or Entity

                                            -----------------------------------
                                            Authorized Signature

                                            -----------------------------------
                                            Name of Individual #2, if applicable

                                            -----------------------------------
                                            Authorized Signature

                                                                              30

<PAGE>   14

                             EXHIBIT I TO SCHEDULE B

                           ACCREDITED INVESTOR STATUS

NOTE: "Accredited Investors" are accorded special status under the federal
securities laws. Individuals who hold certain positions with an issuer or its
affiliates, or who have certain minimum individual income or certain minimum net
worth (each as described below) may qualify as Accredited Investors.
Partnerships, companies or other entities may qualify as Accredited Investors if
they fulfill certain financial and other standards, or if all of their equity
owners have incomes and/or net worth which qualify them individually as
Accredited Investors, and trusts may qualify as Accredited Investors if they
meet certain financial and other tests (as described below).

        You may qualify as an Accredited Investor under Regulation D promulgated
under the Securities Act of 1933 (the "Securities Act") if you meet any of the
following tests:

FOR INDIVIDUALS ONLY

        1.     You are a manager or an executive officer of SONUS COMMUNICATION
HOLDINGS, INC.. An "executive officer" is the chairman, chief executive officer,
president, any vice president in charge of a principal business unit, division
or function (such as sales, administration or finance), any other officer who
performs a policy making function or any other person who performs similar
policy making functions for SONUS COMMUNICATION HOLDINGS, INC.

                                       OR

        2.     You had individual income (exclusive of any income attributable
to your spouse) of more than $200,000 in 1998 and 1999 and reasonably expect to
have an individual income in excess of $200,000 in 2000, or your spouse and you
had a joint income in excess of $300,000 in 1998 and 1999, and you reasonably
expect to have a joint income in excess of $300,000 in 2000. For purposes
hereof, income means adjusted gross income, as reported for federal income tax
purposes, increased by the following amounts: (i) the amount of any tax exempt
interest income under Section 103 of the Internal Revenue Code (the "Code")
received, (ii) the amount of losses claimed as a limited partner in a limited
partnership as reported on Schedule E of Form 1040, (iii) any deduction claimed
for depletion under Section 611 of the Code or (iv) any amount by which income
has been reduced in arriving at adjusted gross income pursuant to the provisions
of Section 1202 of the Code. In determining personal income, however, unrealized
capital gains should not be included.

                                       OR

        3.     You have an individual net worth, or your spouse and you have a
combined net worth, in excess of $1,000,000. For purposes of this statement,
"net worth"

<PAGE>   15

means the excess of total assets at fair market value, including home, home
furnishings and automobiles, over total liabilities.

FOR TRUSTS ONLY

        4.     The Trust has total assets in excess of $3,000,000, was not
formed for the specific purpose of acquiring securities of SONUS COMMUNICATION
HOLDINGS, INC., and the purchase of such securities is directed by a person with
such knowledge and experience in financial and business matters that he is
capable of evaluating the risks and merits of the prospective investment in such
securities.

FOR COMPANIES, PARTNERSHIPS OR OTHER PURCHASING ENTITIES

        5.     Any company, partnership, limited liability company or limited
liability partnership not formed for the specific purpose of acquiring
securities of SONUS COMMUNICATION HOLDINGS, INC., with total assets in excess of
$3,000,000.

                                       OR

        6.     All equity owners of the purchasing entity, if any, are
Accredited Investors.

                                                                              32<PAGE>   1
                                                                   EXHIBIT 4.2

           THIS WARRANT AND THE SHARES OF COMMON STOCK ISSUABLE UPON EXERCISE
           HEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
           AMENDED (THE "ACT"), OR ANY STATE SECURITIES OR BLUE SKY LAWS AND MAY
           NOT BE OFFERED, SOLD, TRANSFERRED, HYPOTHECATED OR OTHERWISE ASSIGNED
           EXCEPT (1) PURSUANT TO A REGISTRATION STATEMENT WITH RESPECT TO SUCH
           SECURITIES WHICH IS EFFECTIVE UNDER THE ACT OR (2) PURSUANT TO AN
           AVAILABLE EXEMPTION FROM REGISTRATION UNDER THE ACT RELATING TO THE
           DISPOSITION OF SECURITIES AND (3) IN ACCORDANCE WITH APPLICABLE STATE
           SECURITIES AND BLUE SKY LAWS.

                                     WARRANT

               WARRANT TO PURCHASE ______________________________________
                 (___________________) SHARES OF COMMON STOCK

                                      OF

                      SONUS COMMUNICATION HOLDINGS, INC.

                      Date of Issuance: July ____, 2000

                                No.__________

THIS CERTIFIES that, for value received, ________________________________, or
its assigns (in either case, the "Holder") is entitled to purchase, subject to
the provisions of this Warrant, from SONUS COMMUNICATION HOLDINGS, INC., a
Delaware corporation (the "Company"), at the price per share set forth in
Section 8 hereof, the number of shares of the Company's common stock, $.0001 par
value per share (the "Common Stock"), set forth in Section 7 hereof. This
Warrant is referred to herein as the "Warrant" and the shares of Common Stock
issuable pursuant to the terms hereof are sometimes referred to herein as
"Warrant Shares". Capitalized terms used but not defined herein shall have the
respective meanings accorded such terms in the Confidential Private Placement
Memorandum dated July 5, 2000.

      Section 1. Exercise of Warrant. To exercise this Warrant in whole or in
part, the Holder shall deliver to the Company at its principal office, (a) a
written notice, in substantially the form of the exercise notice attached
hereto (the "Exercise Notice"), of the Holder's election to exercise this
Warrant, which notice shall specify the number of shares of Common Stock to be
purchased, (b) a check in the amount of the aggregate exercise price for the
Warrant Shares being purchased, and (c) this Warrant. The Company shall as
promptly as practicable, and in any event within twenty (20) days after
delivery to the Company of (i) the Exercise Notice, (ii) the check mentioned
above, and (iii) this Warrant, execute and deliver or cause to be executed and
delivered, in accordance with such notice, a certificate or certificates
representing the aggregate number of shares of Common Stock specified in such
notice, provided the Warrants specified in such notice have

                                                                              32
<PAGE>   2

vested on or prior to the date such notice is delivered. If the Holder elects to
purchase, at any time, less than the number of shares of Common Stock then
purchasable under the terms of this Warrant, the Company shall issue to the
Holder a new Warrant exercisable into the number of remaining shares of Common
Stock purchasable under this Warrant. Each certificate representing Warrant
Shares shall bear the legend or legends required by applicable securities laws
as well as such other legend(s) the Company requires to be included on
certificates for its Common Stock. The Company shall pay all expenses, taxes and
other charges payable in connection with the preparation, issuance and delivery
of such stock certificates except that, in case such stock certificates shall be
registered in a name or names other than the name of the Holder, funds
sufficient to pay all stock transfer taxes that are payable upon the issuance of
such stock certificate or certificates shall be paid by the Holder at the time
of delivering the Exercise Notice. All shares of Common Stock issued upon the
exercise of this Warrant shall be validly issued, fully paid, and nonassessable.
This Warrant may be exercised on multiple occasions in amounts not less than 15%
of the original amount issued before the expiration of its term as described in
this Section 1. This Warrant will expire on July 24, 2005 (the "Expiration
Date").

       Section 2. Reservation of Shares. The Company hereby covenants that at
all times during the term of this Warrant there shall be reserved for issuance
such number of shares of its Common Stock as shall be required to be issued upon
exercise of this Warrant.

       Section 3. Fractional Shares. This Warrant may be exercised only for a
whole number of shares of Common Stock, and no fractional shares or scrip
representing fractional shares shall be issuable upon the exercise of this
Warrant.

       Section 4. Transfer of Warrant and Warrant Shares. The Holder may sell,
pledge, hypothecate, or otherwise transfer this Warrant, in whole or in part,
only in accordance with and subject to the terms and conditions set forth in the
Subscription Agreement and then only if such sale, pledge, hypothecation, or
transfer is made in compliance with the Act or pursuant to an available
exemption from registration under the Act relating to the disposition of
securities, and is made in accordance with applicable State securities laws.

       Section 5. Loss of Warrant. Upon receipt by the Company of evidence
satisfactory to it of the loss, theft, or destruction of this Warrant, and of
indemnification satisfactory to it, or upon surrender and cancellation of this
Warrant, if mutilated, the Company will execute and deliver a new Warrant of
like tenor.

       Section 6. Rights of the Holder. No provision of this Warrant shall be
construed as conferring upon the Holder the right to vote, consent, receive
dividends or receive notice other than as expressly provided herein. Prior to
exercise, no provision hereof, in the absence of affirmative action by the
Holder to exercise this Warrant, and no enumeration herein of the rights or
privileges of the Holder, shall give rise to any liability of the Holder for the
purchase price of any Warrant Shares or as a stockholder of the Company, whether
such liability is asserted by the Company or by creditors of the Company.

       Section 7. Number of Warrant Shares. This Warrant shall be exercisable
for up to ________________________________ (_______________) shares of the
Company's Common Stock, as adjusted in accordance with this Agreement.

       Section 8. Exercise Price; Redemption; Adjustment of Warrants.

                                                                              33
<PAGE>   3

       (a) Determination of Exercise Price. The per share purchase price (the
"Exercise Price") for each of the Warrant Shares purchasable under this Warrant
shall be equal to sixty cents ($0.60).

       (b) Redemption of Warrants. In the event (i) a registration statement has
been filed under the Securities Act covering the Warrant Shares and other
securities which the Company is contractually obligated to register, and such
registration statement is declared effective by the Securities and Exchange
Commission, and (ii) the bid price of the Common Stock on the OTC Bulletin Board
or other exchange is $1.00 or higher for twenty consecutive trading days, the
Company shall have the option to deliver a redemption notice (the "Redemption
Notice") to the holder of this Warrant. Upon delivery of the Redemption Notice,
all Warrants which remain outstanding on the 30th day following delivery of the
Redemption Notice shall be automatically redeemed by the Company for $.01 per
Warrant (the "Redemption Price"). All such unexercised Warrants shall be deemed
cancelled upon the Company's delivery of the Redemption Price to the Holder.
Upon receipt of the Redemption Price, Holder agrees to return any documentation
of the unexercised Warrants to the Company.

       (c) Adjustments for Stock Dividends, Distributions and Subdivisions. If
the Company at any time or from time to time after the original issue date shall
declare or pay any dividend or distribution on the Common Stock payable in
Common Stock, or effect a subdivision of the outstanding shares of Common Stock
into a greater number of shares of Common Stock (by reclassification or
otherwise than by payment of a dividend in Common Stock), then the number of
shares of Common Stock into which this Warrant is exercisable shall be increased
to an amount which is equal to the product of (i) the number of shares of Common
Stock for which this Warrant is exercisable immediately prior to the stock
dividend, distribution or subdivision, as the case may be, and (ii) a fraction,
the numerator of which is equal to the number of shares of Common Stock issued
and outstanding after giving effect to such stock dividend, distribution or
subdivision, and the denominator of which is the number of shares of Common
Stock issued and outstanding prior to such stock dividend, distribution or
subdivision. If the outstanding shares of Common Stock shall be divided or
increased because of a stock dividend or distribution, by stock split or
otherwise, into a greater number of shares of Common Stock, the Exercise Price
in effect immediately prior to such dividend, distribution or division shall,
concurrently with the effectiveness of such division, dividend or distribution,
be proportionately decreased.

       (d) Adjustments for Combinations or Consolidation of Common Stock. If the
outstanding shares of Common Stock shall be combined or consolidated, by
reclassification, reverse stock split or otherwise, into a lesser number of
shares of Common Stock, then the number of shares of Common Stock into which
this Warrant is exercisable shall be decreased to an amount which is equal to
the product of (i) the number of shares of Common Stock for which this Warrant
is exercisable immediately prior to combination or consolidation, as the case
may be, and (ii) a fraction, the numerator of which is equal to the number of
shares of Common Stock issued and outstanding after giving effect to such
combination or consolidation, and the denominator of which is the number of
shares of Common Stock issued and outstanding prior to such combination or
consolidation. If the outstanding shares of Common Stock shall be combined or
consolidated, by reclassification, reverse stock split or otherwise, into a
lesser number of shares of Common Stock, the Exercise Price in effect
immediately prior to such combination or consolidation shall, concurrently with
the effectiveness of such combination or consolidation, be proportionately
increased.

       (e) Adjustment for Mergers or Reorganization, etc. In case of any
consolidation or merger of the Company with or into another corporation or the
conveyance of all or substantially all of the assets of the Company to another
corporation, this Warrant shall be exercisable into the number of shares of
stock or other securities or property to which a holder of the number of shares
of Common Stock of the Company deliverable upon exercise of this Warrant would
have been entitled upon such consolidation, merger or conveyance; and, in any
such case, appropriate adjustment (as determined by the Board of Directors of
the Company) shall be made in the application

                                                                              34
<PAGE>   4

of the provisions herein set forth with respect to the rights and interest
thereafter of the holder of this Warrant, to the end that the provisions set
forth herein shall thereafter be applicable, as nearly as reasonable may be, in
relation to any shares of stock or other property thereafter deliverable upon
the exercise of this Warrant.

       (f) No Impairment. The Company will not, through any reorganization,
transfer of assets, consolidation, merger, dissolution, issue or sale of
securities or any other voluntary action, avoid or seek to avoid the observance
or performance of any of the terms to be observed or performed hereunder by the
Company, but will at all times in good faith assist in the carrying out of all
the provisions of this Section 8 and in the taking of all such action as may be
necessary or appropriate in order to protect the exercise rights of the holder
of this Warrant against impairment.

       (g) Issue Taxes. The Company shall pay any and all issue and other taxes
that may be payable in respect of any issue or delivery of shares of Common
Stock on exercise of this Warrant, in whole or in part; provided, however, that
the Company shall not be obligated to pay any transfer taxes resulting from any
transfer requested by any holder in connection with any such exercise.

       (h) Reservation of Stock Issuable Upon Conversion. The Company shall at
all times reserve and keep available out of its authorized but unissued shares
of Common Stock, solely for the purpose of effecting the exercise of this
Warrant, such number of its shares of Common Stock as shall from time to time be
sufficient to effect the exercise of this Warrant; and if at any time the number
of authorized but unissued shares of Common Stock shall not be sufficient to
effect the exercise of this Warrant, the Company will take all appropriate
corporate action as may, in the opinion of its counsel, be necessary to increase
its authorized but unissued shares of Common Stock to such number of shares as
shall be sufficient for such purpose.

       (i) Fractional Shares. No fractional share shall be issued upon the
exercise, in whole or in part, of this Warrant. If any exercise in whole or in
part of this Warrant would result in the issuance of a fraction of a share of
Common Stock, the Company shall, in lieu of issuing any fractional share, pay
the holder otherwise entitled to such fraction a sum in cash equal to the fair
market value of such fraction on the date of exercise (as determined in good
faith by the Board of Directors of the Company).

       Section 9. Piggy-Back Registration Rights.

       (a) Grant of Piggy-Back Rights. In the event that the Company shall
hereafter initiate a registration of any of its common stock, par value $.001
per share (a "Registered Offering"), either for its own account or the account
of any other holder or holders of equity securities or securities convertible
into equity securities of the Company, other than (i) a registration relating
solely to employee benefit plans, (ii) a registration relating solely to a Rule
145 transaction, (iii) a registration in which the only equity security being
registered is capital stock issuable upon conversion of convertible (or exchange
of exchangeable) debt securities which are also being registered, or (iv) an
initial public offering of the Company, the Company will provide you with
written notice thereof within 30 days of the filing date of the first
registration statement filed in connection with the Registered Offering (the
"Company Notice"), and, subject to the other terms and conditions set forth in
this Section, include in such registration (and any related qualification under
blue sky laws or other compliance) and any underwriting involved therein, if
any, the Warrant Shares which the Holder requests to be included therein within
10 days after the date of the Company Notice (collectively, the "Registrable
Securities").

       (b) Underwritten Registered Offering. If the Registered Offering of which
the Company gives notice is for a registered public offering involving an
underwriting, the Company shall so advise you as a part of the Company Notice.
In such event, your rights to registration pursuant to this Section 9 shall be
conditioned upon your participation in such underwriting, and the inclusion of
your Registrable Securities in the underwriting shall be limited to the extent
provided herein. You shall (together with the Company and the other holders
distributing their securities through such underwriting, if any) enter into an
underwriting agreement in customary form with the managing underwriter selected
for such underwriting by the Company. Notwithstanding any other provision of
this Section 9, if the managing underwriter determines that marketing factors
require a limitation of the number of shares to be underwritten, the managing
underwriter may limit the number of your Registrable Securities to be included
in such registration to such number of your Registrable Securities which the
managing underwriter determines can be included in such underwriting without
reducing the number of shares to be sold by the Company pursuant to such
underwriting or by any persons or entities exercising demand registration rights
in connection with such registration. In such event, the Company shall so advise
you and the number of shares (other than shares being registered by the Company)
that may be included in the registration and underwriting shall be allocated
among all the holders of the Company's shares wishing to participate in the
Registered Offering in proportion, as nearly as practicable, to the respective
amounts of shares held by such holders at the time of filing the Registration
Statement. To facilitate the

                                                                              35
<PAGE>   5

allocation of shares in accordance with the above provisions, the Company may
round the number of shares allocated to any holder to the nearest 100 shares. If
you disapprove of the terms of any such underwriting, you may elect to withdraw
therefrom by written notice to the Company and the managing underwriter. Any
securities excluded or withdrawn from such underwriting shall be withdrawn from
such registration, and shall not be transferred in a public distribution prior
to 180 days after the effective date of the registration statement relating
thereto, or such other shorter period of time as the underwriters may require.

       (c) Termination and Withdrawal of Registration. The Company shall have
the right to terminate or withdraw any Registered Offering or other registration
prior to the effectiveness of such registration whether or not you have elected
to include your Registrable Securities in such registration.

       (d) Expenses. All registration expenses incurred in connection with
registrations pursuant to this Section 9 shall be borne by the Company. Unless
otherwise stated, all selling expenses relating to your Registrable Securities
shall be borne by you.

       (e) Notification Requirements. In the case of each registration,
qualification or compliance effected by the Company pursuant to this Agreement,
the Company will keep you advised in writing as to the initiation of each
registration, qualification and compliance and as to the completion thereof. At
its expense the Company will:

           (i)       prepare and file with the Commission a registration
statement with respect to such securities and use reasonable best efforts to
cause such registration statement to become and remain effective for at least
one hundred twenty (120) days or until the distribution described in the
registration statement has been completed, whichever first occurs; and

           (ii)      furnish to you, should you participate in such
registration, and to the underwriters of the securities being registered such
reasonable number of copies of the registration statement, preliminary
prospectus, final prospectus and such other documents you and/or the
underwriters may reasonably request in order to facilitate the public offering
of such securities.

       (f) Underwriting Agreement Governs. In the event the terms of this
Section 9 conflicts with the terms of any underwriting agreement in connection
with any registration hereunder, the terms of such underwriting agreement shall
control.

       (g) Information. If your Registrable Securities are to be included in any
Registered Offering, you shall furnish to the Company such information as the
Company may request in writing and as shall be required in connection with any
registration, qualification or compliance referred to in this Agreement.

       (h) Termination. The rights granted pursuant to this Section 9 shall
terminate at such time as the Company has registered your Registrable Securities
in a Registered Offering or other registration or when you are permitted to sell
all of your Warrant Shares within any ninety day period under Rule 144
promulgated under the Securities Act of 1933.

       Section 10. Certain Distributions. In case the Company shall, at any
time, prior to the Expiration Date set forth in Section 1 hereof, declare any
distribution of its assets to holders of its Common Stock as a partial
liquidation, distribution or by way of return of capital, other than as a
dividend payable out of earnings or any surplus legally available for dividends,
then the Holder shall be entitled, upon the proper exercise of this Warrant in
whole or in part prior to the effecting of such declaration, to receive, in
addition to the shares of Common Stock issuable on such exercise, the amount of
such assets (or at the option of the Company a sum equal to the value thereof at
the time of such distribution to holders of Common Stock as such value is
determined by the Board of Directors of the Company in good faith), which would
have been payable to the Holder had it been a holder of record of such shares of
Common Stock on the record date for the determination of those holders of Common
Stock entitled to such distribution.

       Section 11. Dissolution or Liquidation. In case the Company shall, at any
time prior to the Expiration Date set forth in Section 1 hereof, dissolve,
liquidate or wind up its affairs, the Holder shall be entitled, upon the proper
exercise of this Warrant in whole or in part and prior to any distribution
associated with such dissolution, liquidation, or winding up, to receive on such
exercise, in lieu of the shares of Common Stock to which the Holder would have
been entitled, the same kind and amount of assets as would have been
distributed or paid to the Holder upon any such dissolution, liquidation or
winding up, with respect to such shares of Common Stock

                                                                              36
<PAGE>   6
had the Holder been a holder of record of such share of Common Stock on the
record date for the determination of those holders of Common Stock entitled to
receive any such dissolution, liquidation, or winding up distribution.

       Section 12. Reclassification or Reorganization. In case of any
reclassification, capital reorganization or other change of outstanding shares
of Common Stock of the Company (other than a change in par value, or from par
value to no par value, or from no par value to par value, or as a result of an
issuance of Common Stock by way of dividend or other distribution or of a
subdivision or combination), the Company shall cause effective provision to be
made so that the Holder shall have the right thereafter by exercising this
Warrant, to purchase the kind and amount of shares of stock and other securities
and property receivable upon such reclassification, capital reorganization or
other change, by a holder of the number of shares of Common Stock which might
have been purchased upon exercise of this Warrant immediately prior to such
reclassification or change. Any such provision shall include provision for
adjustments which shall be as nearly equivalent as may be practicable to the
adjustments provided for in this Warrant. The foregoing provisions of this
Section 12 shall similarly apply to successive reclassifications, capital
reorganizations and changes of shares of Common Stock. In the event that in any
such capital reorganization, reclassification, or other change, additional
shares of Common Stock shall be issued in exchange, conversion, substitution or
payment, in whole or in part, for or of a security of the Company other than
Common Stock, any amount of the consideration received upon the issue thereof
being determined by the Board of Directors of the Company shall be final and
binding on the Holder.

       Section 13. Indemnification.

       (a) Indemnification. The Holders agree, if any of Holders' Registrable
Securities are included in the securities as to which such registration,
qualification or compliance is being effected, to indemnify the Company, each of
its directors and officers, each underwriter, if any, of the Company's
securities covered by such a registration statement, each Person who controls
the Company or such underwriter within the meaning of Section 15 of the
Securities Act, and each other such holder, each of its officers and directors
and each Person controlling such holder within the meaning of Section 15 of the
Securities Act, against all claims, losses, damages and liabilities (or actions
in respect thereof) arising out of or based on any untrue statement (or alleged
untrue statement) of a material fact contained in any such registration
statement, prospectus, offering circular or other document, or any omission (or
alleged omission) to state therein a material fact required to be stated therein
or necessary to make the statements therein not misleading, and will reimburse
the Company, such holders, such directors, officers, Persons, underwriters or
control Persons for any legal or any other expenses reasonably incurred, as such
expenses are incurred, in connection with investigating or defending any such
claim, loss, damage, liability or action, in each case to the extent, but only
to the extent, that such untrue statement (or alleged untrue statement) or
omission (or alleged omission) is made in such registration statement,
prospectus, offering circular or other document in reliance upon and in
conformity with written information furnished to the Company by you.
Notwithstanding the foregoing, your liability under this subsection shall be
limited in an amount equal to the initial price of the Registrable Securities
sold by you, unless such liability arises out of or is based on willful
misconduct by you.

       (b) Indemnification Procedure. Each party entitled to indemnification
under this Section (the "Indemnified Party") shall give notice to the party
required to provide indemnification (the "Indemnifying Party") after such
Indemnified Party has actual knowledge of any claim as to which indemnity may be
sought, and shall permit the Indemnifying Party to assume the defense of any
such claim or any litigation resulting therefrom, provided that counsel for the
Indemnifying Party, who shall conduct the defense of such claim or litigation,
shall be approved by the Indemnified Party (whose approval shall not be
unreasonably withheld), and the Indemnified Party may participate in such
defense at such party's expense, and provided further that the failure of any
Indemnified Party to give notice as provided herein shall not relieve the
Indemnifying Party of its obligations under this Agreement, unless the failure
to give such notice is materially prejudicial to an Indemnifying Party's ability
to defend such action, and provided further that the Indemnifying Party shall
not assume the defense for matters as to which there is a conflict of interest
or separate and different defenses. No Indemnifying Party, in the defense of any
such claim or litigation, shall, except with the consent of each Indemnified
Party, consent to entry of any judgment

                                                                              37
<PAGE>   7

or enter into any settlement which does not include as an unconditional term
thereof the giving by the claimant or plaintiff to such Indemnified Party of a
release from all liability in respect to such claim or litigation.

       Section 14. Miscellaneous.

       (a) Successors and Assigns. The terms and conditions of this Agreement
shall inure to the benefit of, and be binding upon, the respective successors
and assigns of the parties, except to the extent otherwise provided herein.
Nothing in this Agreement, express or implied, is intended to confer upon any
party, other than the parties hereto or their respective successors and assigns,
any rights, remedies, obligations or liabilities under or by reason of this
Agreement, except as expressly provided in this Agreement.

       (b) Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of Delaware, without regard to the
principles of conflict of laws thereof.

       (c) Counterparts; Delivery by Facsimile. This Agreement may be executed
in one or more counterparts, each of which shall be deemed an original, but all
of which together shall constitute one and the same instrument. Delivery of this
Agreement may be effected by facsimile.

       (d) Titles and Subtitles. The titles and subtitles used in this Agreement
are used for convenience only and are not to be considered in construing or
interpreting this Agreement.

       (e) Notices. Unless otherwise provided, any notice required or permitted
hereunder shall be given by personal service upon the party to be notified, by
nationwide overnight delivery service or upon deposit with the United States
Post Office, by certified mail, return receipt requested and:

               i.  if to the Company, addressed to SONUS COMMUNICATION HOLDINGS,
INC., 1600 Wilson Blvd., Suite 1008, Arlington, Virginia 22209, Attention: W.
Todd Coffin, with a copy to Cecil E. Martin, III, Esquire, McGuireWoods LLP,
Seven Saint Paul Street, Suite 1000, Baltimore, Maryland 21202-1626, or at such
other address as the Company may designate by notice to each of the Investors in
accordance with the provisions of this Section; and

               ii.  if to the Warrant holder, at the address indicated on the
signature pages hereof, or at such other addresses as such Holder may designate
by notice to the Company in accordance with the provisions of this Section.

       (f) Amendments and Waivers. Any term of this Agreement may be amended and
the observance of any term of this Agreement may be waived (either generally or
in a particular instance and either prospectively or retroactively), only with
the written consent of the Company and a majority in interest of the Holders
receiving Warrants in the Offering.

(g) Entire Agreement. This Agreement and the Subscription Agreement (including
the exhibits and schedules hereto) constitute the entire agreement among the
parties hereto with respect to the subject matter hereof and thereof and
supersede all prior agreements, understandings, negotiations and discussions,
whether oral or written, of the parties hereto.

       IN WITNESS WHEREOF, the undersigned hereby sets is hand and seal this
____ day of July, 2000.

                                SONUS COMMUNICATION HOLDINGS, INC.

                                By:
                                   --------------------------------------------
                                Name: John K. Friedman
                                Title:    President

                                Investor Name:
                                              ---------------------------------
                                Investor Address:
                                                 ------------------------------

                                                                              38
<PAGE>   8

                                 EXERCISE NOTICE

Dated: _____________________

The undersigned hereby irrevocably elects to exercise his, her or its right to
purchase _________ shares of the common stock, $.0001 par value per share (the
"Common Stock"), of SONUS COMMUNICATION HOLDINGS, INC., a Delaware corporation
(the "Company"), such right being pursuant to a Warrant dated
__________________, 2000, and as issued to the undersigned by the Company, and
remits herewith the sum of $______ in payment for same in accordance with the
Exercise Price specified in Section 8 of said Warrant.

                                                                              39
<PAGE>   9

                                 ASSIGNMENT FORM

Dated: _____________________

           For value received ____________________ hereby sells, assigns and
           transfers unto
           Name:
                --------------------------------------------
                 (Please typewrite or print block letters)

           Address:
                    ----------------------------------------

                    ----------------------------------------

    and appoints:
                    ----------------------------------------

                    ----------------------------------------

Attorney to transfer the said Warrant on the books of SONUS COMMUNICATION
HOLDINGS, INC. with full power of substitution in the premises.

                                Signature:
                                           ------------------------------

                                                                              40

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00018-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00018-of-00352.parquet"}]]