SONUS NETWORKS INC
10-Q, EX-1.1, 2000-08-09
COMPUTER INTEGRATED SYSTEMS DESIGN
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                                                                     EXHIBIT 1.1

                              SONUS NETWORKS, INC.

                                  COMMON STOCK

                          ($0.001 PAR VALUE PER SHARE)


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

                             UNDERWRITING AGREEMENT

                                                                    May 24, 2000

Goldman, Sachs & Co.,
FleetBoston Robertson Stephens Inc.
Lehman Brothers Inc.
J.P. Morgan Securities Inc.
   As representatives of the several Underwriters
     named in Schedule I hereto,
c/o Goldman, Sachs & Co.,
85 Broad Street,
New York, New York 10004

Ladies and Gentlemen:

         Sonus Networks, Inc., a Delaware corporation (the "COMPANY"), proposes,
subject to the terms and conditions stated herein, to issue and sell to the
Underwriters named in Schedule I hereto (the "UNDERWRITERS") an aggregate of
5,000,000 shares (the "FIRM SHARES") and, at the election of the Underwriters,
up to 750,000 additional shares (the "OPTIONAL SHARES") of Common Stock, $0.001
par value per share (the "STOCK"), of the Company (the Firm Shares and the
Optional Shares that the Underwriters elect to purchase pursuant to Section 2
hereof being collectively called the "SHARES").

1.   The Company represents and warrants to, and agrees with, each of the
Underwriters that:

         (a)      A registration statement on Form S-1 (File No. 333-32206) (the
"INITIAL REGISTRATION STATEMENT") in respect of the Shares has been filed with
the Securities and Exchange Commission (the "COMMISSION"); the Initial
Registration Statement and any post-effective amendment thereto, each in the
form heretofore delivered to you, and, excluding exhibits thereto, to you for
each of the other Underwriters, have been declared effective by the Commission
in such form; other than a registration statement, if any, increasing the size
of the offering (a "RULE 462(b) REGISTRATION STATEMENT"), filed pursuant to Rule
462(b) under the Securities Act of 1933, as amended (the "ACT"), which became
effective upon filing, no other document with respect to the Initial
Registration Statement has heretofore been filed with the Commission; and no
stop order suspending the effectiveness of the Initial Registration Statement,
any post-effective amendment thereto or the Rule 462(b) Registration Statement,
if any, has been issued and no proceeding for that purpose has been initiated or
threatened by the Commission (any preliminary prospectus included in the Initial
Registration Statement or filed


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with the Commission pursuant to Rule 424(a) of the rules and regulations of the
Commission under the Act is hereinafter called a "PRELIMINARY PROSPECTUS"; the
various parts of the Initial Registration Statement and the Rule 462(b)
Registration Statement, if any, including all exhibits thereto and including the
information contained in the form of final prospectus filed with the Commission
pursuant to Rule 424(b) under the Act in accordance with Section 5(a) hereof and
deemed by virtue of Rule 430A under the Act to be part of the Initial
Registration Statement at the time it was declared effective, each as amended at
the time such part of the Initial Registration Statement became effective or
such part of the Rule 462(b) Registration Statement, if any, became or hereafter
becomes effective, are hereinafter collectively called the "REGISTRATION
STATEMENT"; and such final prospectus, in the form first filed pursuant to Rule
424(b) under the Act, is hereinafter called the "PROSPECTUS";

         (b)      No order preventing or suspending the use of any Preliminary
Prospectus has been issued by the Commission, and each Preliminary Prospectus,
at the time of filing thereof, conformed in all material respects to the
requirements of the Act and the rules and regulations of the Commission
thereunder, and did not contain 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, in the light of the circumstances under which they were
made, not misleading; PROVIDED, HOWEVER, that this representation and warranty
shall not apply to any statements or omissions made in reliance upon and in
conformity with information furnished in writing to the Company by an
Underwriter through Goldman, Sachs & Co. expressly for use therein;

         (c)      The Registration Statement conforms, and the Prospectus and
any further amendments or supplements to the Registration Statement or the
Prospectus will conform, in all material respects to the requirements of the Act
and the rules and regulations of the Commission thereunder and do not and will
not, as of the applicable effective date as to the Registration Statement and
any amendment thereto, and as of the applicable filing date as to the Prospectus
and any amendment or supplement thereto, contain 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; PROVIDED, HOWEVER, that
this representation and warranty shall not apply to any statements or omissions
made in reliance upon and in conformity with information furnished in writing to
the Company by an Underwriter through Goldman, Sachs & Co. expressly for use
therein;

         (d)      There are no contracts or other documents required to be
described in the Registration Statement or to be filed as exhibits to the
Registration Statement by the Act or by the rules and regulations thereunder
which have not been described or filed as required; the contracts so described
in the Prospectus to which the Company or any of its subsidiaries is a party
have been duly authorized, executed and delivered by the Company and its
subsidiaries, as are party thereto, constitute valid and binding agreements of
the Company and its subsidiaries, as are party thereto, are enforceable against
the Company and its subsidiaries, as are party thereto, in accordance with their
respective terms and are in full force and effect on the date hereof; to the
best of the Company's knowledge, the contracts so described in the Prospectus to
which the Company or any of its subsidiaries is a party are enforceable by the
Company and its subsidiaries, as are party thereto, against the other parties
thereto in accordance with their respective terms; and neither the Company nor
any of its subsidiaries, nor, to the best of the Company's knowledge, any other
party is in breach of or default under any of such contracts, except for such
breaches or defaults that, singly or in the aggregate, would not result in a
material adverse change in or affecting the business, assets, management,
financial condition or results of operations of the Company and its subsidiaries
taken as a whole;


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         (e)      Neither the Company nor any of its subsidiaries has sustained
since the date of the latest audited financial statements included in the
Prospectus any material loss or interference with its business from fire,
explosion, flood or other calamity, whether or not covered by insurance, or from
any labor dispute or court or governmental action, order or decree, otherwise
than as set forth in the Prospectus; and, since the respective dates as of which
information is given in the Registration Statement and the Prospectus, there has
not been any change in the capital stock (other than issuances of Stock pursuant
to Company stock option, stock incentive or stock purchase plans described in
the Registration Statement and Prospectus) or long-term debt of the Company or
any of its subsidiaries or any material adverse change, or any development
involving a prospective material adverse change, in or affecting the business,
assets, management, financial position or results of operations of the Company
and its subsidiaries taken as a whole;

         (f)      None of the Company and its subsidiaries owns any real
property; each of the Company and its subsidiaries has good and marketable title
to all personal property owned by it, free and clear of all liens, encumbrances
and defects except such as are described in the Prospectus or such as do not
materially affect the value of such property and do not interfere with the use
made and proposed to be made of such property by the Company and its
subsidiaries; and any real property and buildings held under lease by the
Company or any of its subsidiaries are held under valid, subsisting and
enforceable leases with such exceptions as are not material and do not interfere
with the use made and proposed to be made of such property and buildings by the
Company and its subsidiaries; the Company and its subsidiaries own or lease all
such properties as are necessary to their operations as now conducted, except
where the failure to so own or lease would not, singly or in the aggregate,
result in a material adverse change in or affecting the business, assets,
management, financial condition or results of operations of the Company and its
subsidiaries taken as a whole;

         (g)      Each of the Company and its subsidiaries has been duly
incorporated and is validly existing as a corporation in good standing under the
laws of its respective jurisdiction of organization, each with full power and
authority (corporate and other) to own its properties and conduct its business
as described in the Prospectus, and has been duly qualified as a foreign
corporation for the transaction of business and is in good standing under the
laws of each other jurisdiction in which it owns or leases properties or
conducts any business so as to require such qualification, or is subject to no
material liability or disability by reason of the failure to be so qualified in
any such jurisdiction;

         (h)      The Company has an authorized capitalization as set forth in
the Prospectus, and all of the issued shares of capital stock of the Company
have been duly authorized and validly issued, are fully paid and non-assessable
and conform to the description of the Stock contained in the Prospectus; all of
the issued shares of capital stock of each subsidiary of the Company have been
duly authorized and validly issued, are fully paid and non-assessable and
(except for directors' qualifying shares) are owned directly or indirectly by
the Company, free and clear of all liens, encumbrances, equities or claims
except such as are described in the Prospectus; except as disclosed in or
contemplated by the Prospectus and the consolidated financial statements of the
Company, and the related notes thereto, included in the Prospectus, neither the
Company nor any subsidiary has outstanding any options to purchase, or any
preemptive rights or other rights to subscribe for or to purchase any securities
or obligations convertible into, or any contracts or commitments to issue or
sell, shares of its capital stock or any such options, rights, convertible
securities or obligations; and the description of the Company's stock option and
stock purchase plans and the options or other rights granted and exercised
thereunder set forth


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in the Prospectus accurately and fairly presents the information required to be
shown with respect to such plans, options and rights;

         (i)      The unissued Shares to be issued and sold by the Company to
the Underwriters hereunder have been duly authorized and, when issued and
delivered against payment therefor as provided herein, will be validly issued
and fully paid and non-assessable and will conform to the description of the
Stock contained in the Prospectus; no preemptive rights or other rights to
subscribe for or purchase exist with respect to the issuance and sale of the
Shares by the Company pursuant to this Agreement; no stockholder of the Company
has any right, which has not been waived, to require the Company to register the
sale of any shares of capital stock owned by such stockholder under the Act in
the public offering contemplated by this Agreement; no stockholder of the
Company has any right to require the Company to register the sale of any shares
of capital stock owned by such stockholder under the Act in the 180-day period
after the date of the Prospectus other than as described in the Prospectus; and
no further approval or authority of the stockholders or the Board of Directors
of the Company will be required for the issuance and sale of the Shares to be
sold by the Company as contemplated herein;

         (j)      The Company has full corporate power and authority to enter
into this Agreement; this Agreement has been duly authorized, executed and
delivered by the Company, constitutes a valid and binding obligation of the
Company and is enforceable against the Company in accordance with its terms;

         (k)      The issue and sale of the Shares by the Company and the
compliance by the Company with all of the provisions of this Agreement and the
consummation of the transactions herein contemplated will not conflict with or
result in a breach or violation of any of the terms or provisions of, or
constitute a default under, any material indenture, mortgage, deed of trust,
loan agreement or other agreement or instrument to which the Company or any of
its subsidiaries is a party or by which the Company or any of its subsidiaries
is bound or to which any of the property or assets of the Company or any of its
subsidiaries is subject, nor will such action result in any violation of the
provisions of the Certificate of Incorporation or By-laws of the Company or any
statute or any order, rule or regulation of any court or governmental agency or
body having jurisdiction over the Company or any of its subsidiaries or any of
their properties; and no consent, approval, authorization, order, filing,
registration or qualification of or with any such court or governmental agency
or body is required for the issue and sale of the Shares or the consummation by
the Company of the transactions contemplated by this Agreement, except the
registration under the Act of the Shares and such consents, approvals,
authorizations, filings, registrations or qualifications as may be required
under state securities or Blue Sky laws in connection with the purchase and
distribution of the Shares by the Underwriters;

         (l)      Except as disclosed in the Prospectus, there are no legal or
governmental actions, suits or proceedings pending or, to the best of the
Company's knowledge, threatened to which the Company or any of its subsidiaries
is or may be a party or of which property owned or leased by the Company or any
of its subsidiaries is or may be the subject, which actions, suits or
proceedings are required to be described in the Registration Statement by the
Act or the rules and regulations thereunder or which might, singly or in the
aggregate, prevent or adversely affect the transactions contemplated by this
Agreement or result in a material adverse change in or affecting the business,
assets, management, financial position (after giving effect to the offering of
the Shares) or results of operations of the Company and its subsidiaries taken
as a whole; and, to the best of the Company's knowledge, no such proceedings are
threatened or contemplated by governmental authorities or others; no labor
disturbance by the employees of the Company or any of its subsidiaries exists
or, to the knowledge of the Company, is imminent


<PAGE>

which might be expected to affect adversely the business, assets, management,
financial position or results of operations of the Company and its subsidiaries
taken as a whole; and neither the Company nor any of its subsidiaries is a party
or subject to the provisions of any injunction, judgment, decree or order of any
court, regulatory body, administrative agency or other governmental body;

         (m)      Neither the Company nor any of its subsidiaries is in
violation of its Certificate of Incorporation or By-laws or any similar
organizational documents or in default in the performance or observance of any
obligation, agreement, covenant or condition contained in any indenture,
mortgage, deed of trust, loan agreement, lease or other agreement or instrument
to which it is a party or by which it or any of its properties may be bound
except for such violations or defaults that would not, singly or in the
aggregate, result in a material adverse change in or affecting the business,
assets, management, financial position or results of operations of the Company
and its subsidiaries taken as a whole;

         (n)      The statements set forth in the Prospectus under the caption
"Description of Capital Stock", insofar as they purport to constitute a summary
of the terms of the Stock and under the caption "Underwriting", insofar as they
purport to describe the provisions of the laws and documents referred to
therein, are accurate, complete and fair;

         (o)      The Company is not and, after giving effect to the offering
and sale of the Shares, will not be an "investment company", as such term is
defined in the Investment Company Act of 1940, as amended (the "INVESTMENT
COMPANY ACT");

         (p)      Neither the Company nor any of its affiliates does business
with the government of Cuba or with any person or affiliate located in Cuba
within the meaning of Section 517.075, Florida Statutes;

         (q)      The Company and its subsidiaries possess all licenses,
certificates, authorizations or permits issued by the appropriate governmental
or regulatory agencies or authorities that are necessary to enable them to own,
lease and operate their respective properties and to carry on their respective
businesses as currently conducted and which are material to the Company and its
subsidiaries, and neither the Company nor any of its subsidiaries has received
any notice of proceedings relating to the revocation or modification of any such
license, certificate, authorization or permit which, singly or in the aggregate,
would be expected to materially and adversely affect the business, assets,
management, financial position or results of operations of the Company and its
subsidiaries taken as a whole;

         (r)      The consolidated financial statements and schedules of the
Company, and the related notes thereto, included in the Registration Statement
and the Prospectus present fairly in all material respects the financial
position of the Company as of the respective dates of such financial statements
and schedules, and the results of operations and cash flows of the Company for
the respective periods covered thereby; such statements, schedules and related
notes have been prepared in accordance with generally accepted accounting
principles applied on a consistent basis as certified by the independent public
accountants named in paragraph (s) below; no other financial statements or
schedules are required to be included in the Registration Statement; and the
selected financial data set forth in the Prospectus under the captions "Summary
Financial Information," "Capitalization" and "Selected Financial Data" fairly
present the information set forth therein on the basis stated in the
Registration Statement;


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         (s)      Arthur Andersen LLP, who have certified certain financial
statements of the Company and its subsidiaries, are independent public
accountants as required by the Act and the rules and regulations of the
Commission thereunder;

         (t)      The Company has reviewed its operations and that of its
subsidiaries and any third parties with which the Company or any of its
subsidiaries has a material relationship to evaluate the extent to which the
business or operations of the Company or any of its subsidiaries has been or
will be affected by the Year 2000 Problem. As a result of such review, the
Company has no reason to believe, and does not believe, that the Year 2000
Problem has had or will have a material adverse effect on the business, assets,
management, financial position or results of operations of the Company and its
subsidiaries taken as a whole or has resulted in or will result in any material
loss or interference with the Company's business or operations. The "Year 2000
Problem" as used herein means any significant risk that computer hardware or
software used in the receipt, transmission, processing, manipulation, storage,
retrieval, retransmission or other utilization of data or in the operation of
mechanical or electrical systems of any kind is not functioning or will not
function, in the case of dates or time periods occurring after December 31,
1999, at least as effectively as in the case of dates or time periods occurring
prior to January 1, 2000;

         (u)      The Company and its subsidiaries are in compliance with any
and all applicable foreign, federal, state and local laws and regulations
relating to the protection of human health and safety, including without
limitation those relating to occupational safety and health, the environment or
hazardous or toxic substances or wastes, pollutants or contaminants, including
without limitation those relating to the storage, handling or transportation of
hazardous or toxic materials (collectively, "ENVIRONMENTAL LAWS"), except where
such noncompliance with Environmental Laws would not, singly or in the
aggregate, be expected to have a material adverse effect on the business,
assets, management, financial position or results of operations of the Company
and its subsidiaries taken as a whole. The Company, in its reasonable judgment,
has concluded that, based upon facts and circumstances existing as of the date
hereof, any costs or liabilities associated with Environmental Laws (including,
without limitation, any capital or operating expenditures required for clean-up,
closure of properties or compliance with Environmental Laws or any permit,
license or approval, any related constraints on operating activities and any
potential liabilities to third parties) would not, singly or in the aggregate,
reasonably be expected to have a material adverse effect on the business,
assets, management, financial position or results of operation of the Company
and its subsidiaries taken as a whole;

         (v)      Except as disclosed in the Prospectus, the Company and its
subsidiaries own or have the right to use all trademarks, trade names, patent
rights, copyrights, licenses, trade secrets, know-how, intellectual property and
other similar rights necessary to conduct their business as now conducted; the
Company has no knowledge of any infringement by the Company or any of its
subsidiaries of any trademark, trade name, patent, copyright, license, trade
secret, know-how, intellectual property or other similar rights of others; and
there are no claims of infringement being made against the Company or any of its
subsidiaries regarding trademark, trade name, patent, copyright, license, trade
secret, know-how, intellectual property or other similar rights which could,
singly or in the aggregate, have a material adverse effect on the business,
assets, management, financial position or results of operations of the Company
and its subsidiaries taken as a whole; the Company has no knowledge of any
infringement by any third party of the trademark, trade name, patent, copyright,
license, trade secret, know-how, intellectual property or other similar rights
of the Company or any of its subsidiaries; none of the


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technology employed by the Company or any of its subsidiaries has been obtained
or is being used by the Company or any of its subsidiaries in violation of any
contractual or fiduciary obligation binding on the Company, its subsidiaries or
any of their respective directors or executive officers or, to the best of the
Company's knowledge, any of their respective employees or consultants or
otherwise in violation of the rights of any person; none of the Company, its
subsidiaries and, to the best of the Company's knowledge, any of its employees
has received any written or, to the Company's knowledge, oral communications
alleging that the Company or any of its subsidiaries has violated or, by
conducting its business as proposed, would violate any of the intellectual
property or proprietary rights of any other person except for such violations as
would not, singly or in the aggregate, have a material adverse effect on the
business, assets, management, financial position or results of operations of the
Company and its subsidiaries taken as a whole; neither the execution nor
delivery of this Agreement, nor the operation of the business of the Company and
its subsidiaries by the employees of the Company or its subsidiaries, nor the
conduct of the business of the Company and its subsidiaries as proposed, will,
to the Company's knowledge, result in a breach or violation of the terms,
conditions or provisions of, or constitute a default under, any contract,
covenant or instrument under which any of such employees is now obligated except
for such breaches, violations or defaults as would not, singly or in the
aggregate, have a material adverse effect on the business, assets, management,
financial position or results of operations of the Company and its subsidiaries
taken as a whole; and the Company and its subsidiaries have taken and will
maintain reasonable measures to prevent the unauthorized dissemination or
publication of its confidential information or the confidential information of
third parties in its possession;

         (w)      The Company and each of its subsidiaries have filed all
necessary federal, state, local and foreign income and franchise tax returns and
have paid all taxes shown as due thereon; and the Company has no knowledge of
any tax deficiencies which has been or might be asserted or threatened against
the Company or any of its subsidiaries which could, singly or in the aggregate,
materially and adversely affect the business, assets, management, financial
position or results of operations of the Company and its subsidiaries taken as a
whole;

         (x)      Each of the Company and its subsidiaries maintains insurance
of the types and in the amounts which it reasonably deems adequate for its
business, including, but not limited to, insurance covering real and personal
property owned or leased by the Company and its subsidiaries against theft,
damage, destruction, acts of vandalism and all other risks customarily insured
against, all of which insurance is in full force and effect;

         (y)      Neither the Company nor any of its subsidiaries has at any
time during the last five years (i) made any unlawful contribution to any
candidate for foreign office, or failed to disclose fully any contribution in
violation of law, or (ii) made any payment to any foreign, federal or state
governmental officer or official, or other person charged with similar public or
quasi-public duties, other than payments required or permitted by the laws of
the United States or any jurisdiction thereof;

         (z)      The Company has not taken and will not take, directly or
indirectly through any of its directors, officers or controlling persons, any
action which is designed to or which has constituted or which might reasonably
be expected to cause or result in stabilization or manipulation of the price of
any security of the Company to facilitate the sale or resale of the Shares; and


         (aa)     The Company has filed a registration statement pursuant to
Section 12(g) of the Securities Exchange Act of 1934, as amended, to register
the Common Stock, has filed an


<PAGE>

application to list the Common Stock on the National Association of Securities
Dealers Automated Quotations National Market System ("NASDAQ") and has received
notification that the listing has been approved, subject to notice of issuance
of the Shares.

2.   Subject to the terms and conditions herein set forth, (a) the Company
agrees to issue and sell to each of the Underwriters, and each of the
Underwriters agrees, severally and not jointly, to purchase from the Company, at
a purchase price per share of $21.39, the number of Firm Shares set forth
opposite the name of such Underwriter in Schedule I hereto and (b) in the event
and to the extent that the Underwriters shall exercise the election to purchase
Optional Shares as provided below, the Company agrees to issue and sell to each
of the Underwriters, and each of the Underwriters agrees, severally and not
jointly, to purchase from the Company, at the purchase price per share set forth
in clause (a) of this Section 2, that portion of the number of Optional Shares
as to which such election shall have been exercised (to be adjusted by you so as
to eliminate fractional shares) determined by multiplying such number of
Optional Shares by a fraction, the numerator of which is the maximum number of
Optional Shares which such Underwriter is entitled to purchase as set forth
opposite the name of such Underwriter in Schedule I hereto and the denominator
of which is the maximum number of Optional Shares that all of the Underwriters
are entitled to purchase hereunder.

         The Company hereby grants to the Underwriters the right to purchase at
their election up to 750,000 Optional Shares, at the purchase price per share
set forth in the paragraph above, for the sole purpose of covering sales of
shares in excess of the number of Firm Shares. Any such election to purchase
Optional Shares may be exercised only by written notice from you to the Company,
given within a period of 30 calendar days after the date of this Agreement,
setting forth the aggregate number of Optional Shares to be purchased and the
date on which such Optional Shares are to be delivered, as determined by you but
in no event earlier than the First Time of Delivery (as defined in Section 4
hereof) or, unless you and the Company otherwise agree in writing, earlier than
two or later than ten business days after the date of such notice.

3.   Upon the authorization by you of the release of the Firm Shares, the
several Underwriters propose to offer the Firm Shares for sale upon the terms
and conditions set forth in the Prospectus.

4.       (a)      The Shares to be purchased by each Underwriter hereunder, in
definitive form, and in such authorized denominations and registered in such
names as Goldman, Sachs & Co. may request upon at least forty-eight hours' prior
notice to the Company shall be delivered by or on behalf of the Company to
Goldman, Sachs & Co., through the facilities of the Depository Trust Company
("DTC"), for the account of such Underwriter, against payment by or on behalf of
such Underwriter of the purchase price therefor by wire transfer of Federal
(same-day) funds to the account specified by the Company to Goldman, Sachs & Co.
at least forty-eight hours in advance. The Company will cause the certificates
representing the Shares to be made available for checking and packaging at least
twenty-four hours prior to the Time of Delivery (as defined below) with respect
thereto at the office of DTC or its designated custodian (the "DESIGNATED
OFFICE"). The time and date of such delivery and payment shall be, with respect
to the Firm Shares, 9:30 a.m., New York City time, on May 31, 2000 or such other
time and date as Goldman, Sachs & Co. and the Company may agree upon in writing,
and, with respect to the Optional Shares, 9:30 a.m., New York time, on the date
specified by Goldman, Sachs & Co. in the written notice given by Goldman, Sachs
& Co. of the Underwriters' election to purchase such Optional Shares, or such
other time and date as Goldman, Sachs & Co. and the Company may agree upon in
writing. Such time and date for delivery of the Firm Shares is herein called the
"FIRST TIME OF DELIVERY", such time and date for delivery of the Optional
Shares, if not the First


<PAGE>

Time of Delivery, is herein called the "SECOND TIME OF DELIVERY", and each such
time and date for delivery is herein called a "TIME OF DELIVERY".

         (b)      The documents to be delivered at each Time of Delivery by or
on behalf of the parties hereto pursuant to Section 7 hereof, including the
cross receipt for the Shares and any additional documents requested by the
Underwriters pursuant to Section 7 hereof, will be delivered at the offices of
Bingham Dana LLP, Boston, Massachusetts 02110 (the "CLOSING LOCATION"), and the
Shares will be delivered at the Designated Office, all at such Time of Delivery.
A meeting will be held at the Closing Location at 6:00 p.m., New York City time,
on the New York Business Day next preceding such Time of Delivery, at which
meeting the final drafts of the documents to be delivered pursuant to the
preceding sentence will be available for review by the parties hereto. For the
purposes of this Section 4, "NEW YORK BUSINESS DAY" shall mean each Monday,
Tuesday, Wednesday, Thursday and Friday which is not a day on which banking
institutions in New York are generally authorized or obligated by law or
executive order to close.

5.   The Company agrees with each of the Underwriters:

         (a)      To prepare the Prospectus in a form approved by you and to
file such Prospectus pursuant to Rule 424(b) under the Act not later than the
Commission's close of business on the second business day following the
execution and delivery of this Agreement, or, if applicable, such earlier time
as may be required by Rule 430A(a)(3) under the Act; to make no further
amendment or any supplement to the Registration Statement or Prospectus which
shall be disapproved by you promptly after reasonable notice thereof; to advise
you, promptly after it receives notice thereof, of the time when any amendment
to the Registration Statement has been filed or becomes effective or any
supplement to the Prospectus or any amended Prospectus has been filed and to
furnish you with copies thereof; to advise you, promptly after it receives
notice thereof, of the issuance by the Commission of any stop order or of any
order preventing or suspending the use of any Preliminary Prospectus or the
Prospectus, of the suspension of the qualification of the Shares for offering or
sale in any jurisdiction, of the initiation or threatening of any proceeding for
any such purpose, or of any request by the Commission for the amending or
supplementing of the Registration Statement or Prospectus or for additional
information; and, in the event of the issuance of any stop order or of any order
preventing or suspending the use of any Preliminary Prospectus or the Prospectus
or suspending any such qualification, promptly to use its best efforts to obtain
the withdrawal of such order;

         (b)      Promptly from time to time to take such action as you may
reasonably request to qualify the Shares for offering and sale under the
securities laws of such jurisdictions as you may reasonably request and to
comply with such laws so as to permit the continuance of sales and dealings
therein in such jurisdictions for as long as may be necessary to complete the
distribution of the Shares, provided that in connection therewith the Company
shall not be required to qualify as a foreign corporation or to file a general
consent to service of process in any jurisdiction;

         (c)      Prior to 10:00 A.M., New York City time, on the New York
Business Day next succeeding the date of this Agreement and from time to time,
to furnish the Underwriters with copies of the Prospectus in New York City in
such quantities as you may reasonably request, and, if the delivery of a
prospectus is required under the Act at any time prior to the expiration of nine
months after the time of issue of the Prospectus in connection with the offering
or sale of the Shares and if at such time any event shall have occurred as a
result of which the Prospectus as then amended or supplemented would include an
untrue statement of a material fact or omit


<PAGE>

to state any material fact necessary in order to make the statements therein, in
the light of the circumstances under which they were made when such Prospectus
is delivered, not misleading, or, if for any other reason it shall be necessary
during such period to amend or supplement the Prospectus in order to comply with
the Act, to notify you and upon your request to prepare and furnish without
charge to each Underwriter and to any dealer in securities as many copies as you
may from time to time reasonably request of an amended Prospectus or a
supplement to the Prospectus which will correct such statement or omission or
effect such compliance, and in case any Underwriter is required under the Act to
deliver a prospectus in connection with sales of any of the Shares at any time
nine months or more after the time of issue of the Prospectus, upon your request
but at the expense of such Underwriter, to prepare and deliver to such
Underwriter as many copies as you may request of an amended or supplemented
Prospectus complying with Section 10(a)(3) of the Act;

         (d)      To make generally available to its securityholders as soon as
practicable, but in any event not later than eighteen months after the effective
date of the Registration Statement (as defined in Rule 158(c) under the Act), an
earnings statement of the Company and its subsidiaries (which need not be
audited) complying with Section 11(a) of the Act and the rules and regulations
thereunder (including, at the option of the Company, Rule 158);

         (e)      During the period beginning from the date hereof and
continuing to and including the date 180 days after the date of the Prospectus,
not to offer, sell, contract to sell or otherwise dispose of, except as provided
hereunder any securities of the Company that are substantially similar to the
Shares, including but not limited to any securities that are convertible into or
exchangeable for, or that represent the right to receive, Stock or any such
substantially similar securities (other than pursuant to employee stock option,
stock incentive or stock purchase plans existing on, upon the exercise of
securities that represent the right to receive Stock outstanding as of, or upon
the conversion or exchange of convertible or exchangeable securities outstanding
as of, the date of this Agreement), without your prior written consent;

         (f)      To furnish to its stockholders within the time period
prescribed by the Securities Exchange Act of 1934, as amended (the "EXCHANGE
ACT"), and the rules and regulations thereunder, an annual report (including a
balance sheet and statements of income, stockholders' equity and cash flows of
the Company and its consolidated subsidiaries certified by independent public
accountants) and, within the time periods prescribed by the Exchange Act and the
rules and regulations thereunder (beginning with the fiscal quarter ending after
the effective date of the Registration Statement), to make available to its
stockholders consolidated summary financial information of the Company and its
subsidiaries for such quarter in reasonable detail;

         (g)      During a period of five years from the effective date of the
Registration Statement, to furnish to you upon request copies of all reports or
other communications (financial or other) furnished to stockholders, and to
deliver to you (i) as soon as they are available, copies of any reports and
financial statements furnished to or filed with the Commission or any national
securities exchange on which any class of securities of the Company is listed;
and (ii) subject to your obligations under applicable law, such additional
information concerning the business and financial condition of the Company as
you may from time to time reasonably request (such financial statements to be on
a consolidated basis to the extent the accounts of the Company and its
subsidiaries are consolidated in reports furnished to its stockholders generally
or to the Commission);


<PAGE>

         (h)      To use the net proceeds received by it from the sale of the
Shares pursuant to this Agreement in the manner specified in the Prospectus
under the caption "Use of Proceeds" and in a manner such that the Company will
not become an "investment company" as that term is defined in the Investment
Company Act;

         (i)      To file with the Commission such information on Form 10-Q or
Form 10-K as may be required by Rule 463 under the Act;

         (j)      If the Company elects to rely upon Rule 462(b), the Company
shall file a Rule 462(b) Registration Statement with the Commission in
compliance with Rule 462(b) by 10:00 P.M., Washington, D.C. time, on the date of
this Agreement, and the Company shall at the time of filing either pay to the
Commission the filing fee for the Rule 462(b) Registration Statement or give
irrevocable instructions for the payment of such fee pursuant to Rule 111(b)
under the Act;

         (k)      Not to grant options, warrants or other rights to purchase
shares of Stock that would become exercisable during the period beginning on the
date hereof and continuing to and including the date 180 days after the date of
the Prospectus, other than options under the Company's 2000 Employee Stock
Purchase Plan and such options, warrants or other rights granted to persons who,
prior to such grant, execute agreements substantially to the effect set forth in
Subsection 5(e) hereof in form and substance satisfactory to you; and

         (l)      During the period beginning on the date hereof and continuing
to and including the date 180 days after the date of the Prospectus, to issue
stop transfer instructions with respect to the Stock to the transfer agent and
registrar for the Stock and use its best efforts to cause such transfer agent
and registrar to enforce such instructions; to enforce agreements in favor of
the Company with respect to restrictions on transfer of the Stock and agreements
to enter into lock-up agreements with you; and, during the period beginning on
the date hereof and continuing to and including the date 180 days after the date
of the Prospectus, to place legends on or use its best efforts to cause the
transfer agent and registrar for the Stock to place appropriate legends on
certificates representing the Stock noting all restrictions on transfer thereof.


6.   The Company covenants and agrees with the several Underwriters that the
Company will pay or cause to be paid the following: (i) the fees, disbursements
and expenses of the Company's counsel and accountants in connection with the
registration of the Shares under the Act and all other expenses in connection
with the preparation, printing and filing of the Registration Statement, any
Preliminary Prospectus and the Prospectus and amendments and supplements thereto
and the mailing and delivering of copies thereof to the Underwriters and
dealers; (ii) the cost of printing or producing any Agreement among
Underwriters, this Agreement, the Blue Sky Memorandum, closing documents
(including any compilations thereof) and any other documents in connection with
the offering, purchase, sale and delivery of the Shares, and the fees and
disbursements of counsel for the Underwriters in connection with securing any
required review by the National Association of Securities Dealers, Inc. of the
terms of the sale of the Shares; (iii) all expenses in connection with the
qualification of the Shares for offering and sale under state securities laws as
provided in Section 5(b) hereof, including the fees and disbursements of counsel
for the Underwriters in connection with such qualification and in connection
with the Blue Sky survey; (iv) all fees and expenses in connection with listing
the Shares on the NASDAQ; (v) the filing fees incident to securing any required
review by the National Association of Securities Dealers, Inc. of the terms of
the sale of the Shares; (vi) the cost of preparing stock certificates; (vii) the
cost and charges of any transfer agent or registrar; and (viii) all other costs
and expenses incident to the performance of its obligations hereunder which are
not otherwise specifically provided for in this Section. It is understood,
however, that,

<PAGE>

(x) except as provided in this Section, and Sections 8 and 11 hereof, the
Underwriters will pay all of their own costs and expenses, including the fees of
their counsel, stock transfer taxes on resale of any of the Shares by them, and
any advertising expenses connected with any offers they may make, and (y) other
than with respect to filing or similar fees, the maximum liability of the
Company under clauses (ii) and (iii) above shall be $20,000.

7.   The obligations of the Underwriters hereunder, as to the Shares to be
delivered at each Time of Delivery, shall be subject, in their discretion, to
the condition that all representations and warranties and other statements of
the Company herein are, at and as of such Time of Delivery, true and correct,
the condition that the Company shall have performed all of its obligations
hereunder theretofore to be performed, and the following additional conditions:


         (a)      The Prospectus shall have been filed with the Commission
pursuant to Rule 424(b) within the applicable time period prescribed for such
filing by the rules and regulations under the Act and in accordance with Section
5(a) hereof; if the Company has elected to rely upon Rule 462(b), the Rule
462(b) Registration Statement shall have become effective by 10:00 P.M.,
Washington, D.C. time, on the date of this Agreement; no stop order suspending
the effectiveness of the Registration Statement or any part thereof shall have
been issued and no proceeding for that purpose shall have been initiated or
threatened by the Commission; and all requests for additional information on the
part of the Commission shall have been complied with to your reasonable
satisfaction;

         (b)      Ropes & Gray, counsel for the Underwriters, shall have
furnished to you such written opinion or opinions (a draft of each such
opinion is attached as Annex II(a) hereto), dated such Time of Delivery, with
respect to the matters covered in paragraphs (i), (ii), (vi), (ix) and (xi)
of subsection (c) below as well as such other related matters as you may
reasonably request, and such counsel shall have received such papers and
information as they may reasonably request to enable them to pass upon such
matters;

         (c) Bingham Dana LLP, counsel for the Company, shall have furnished
to you their written opinion (a draft of such opinion is attached as Annex
II(b) hereto), dated such Time of Delivery, in form and substance
satisfactory to you, to the effect that:

                  (i)      The Company has been duly incorporated and is validly
         existing as a corporation in good standing under the laws of the State
         of Delaware, with corporate power and authority to own its properties
         and conduct its business as described in the Prospectus;

                  (ii)     The Company has an authorized capitalization as set
         forth in the Prospectus, and all of the issued shares of capital stock
         of the Company (including the Shares being delivered at such Time of
         Delivery) have been duly authorized and validly issued and are fully
         paid and non-assessable; and the Shares conform to the description of
         the Stock contained in the Prospectus;

                  (iii)    The Company is duly qualified as a foreign
         corporation for the transaction of business and is in good standing
         under the laws of The Commonwealth of Massachusetts;

                  (iv)     Each subsidiary of the Company has been duly
         incorporated and is validly existing as a corporation in good standing
         under the laws of its jurisdiction of incorporation; and all of the
         issued shares of capital stock of each such subsidiary have been duly
         authorized and validly issued, are fully paid and non-assessable, and
         (except


<PAGE>

         for directors' qualifying shares) are owned directly or indirectly by
         the Company, free and clear of all liens, encumbrances, equities or
         claims to the knowledge of such counsel;

                  (v)      To the best of such counsel's knowledge and other
         than as set forth in the Prospectus, there are no legal or governmental
         proceedings pending to which the Company or any of its subsidiaries is
         a party or of which any property of the Company or any of its
         subsidiaries is the subject which, if determined adversely to the
         Company or any of its subsidiaries, would individually or in the
         aggregate be reasonably expected to have a material adverse effect on
         the business, assets, management, financial position or results of
         operations of the Company and its subsidiaries taken as a whole; and,
         to the best of such counsel's knowledge, no such proceedings are
         threatened or contemplated by governmental authorities or threatened by
         others;

                  (vi)     The Company has full corporate power and authority to
         enter into this Agreement and this Agreement has been duly authorized,
         executed and delivered by the Company;

                  (vii)    The issue and sale of the Shares being delivered at
         such Time of Delivery by the Company and the compliance by the Company
         with all of the provisions of this Agreement and the consummation of
         the transactions herein contemplated will not conflict with or result
         in a breach or violation of any of the terms or provisions of, or
         constitute a default under, any indenture, mortgage, deed of trust,
         loan agreement or other agreement or instrument known to such counsel
         to which the Company or any of its subsidiaries is a party or by which
         the Company or any of its subsidiaries is bound or to which any of the
         property or assets of the Company or any of its subsidiaries is
         subject, nor will such action result in any violation of the provisions
         of the Certificate of Incorporation or By-laws of the Company or any
         statute or any order, rule or regulation known to such counsel of any
         federal or Massachusetts court or governmental agency or body having
         jurisdiction over the Company or any of its subsidiaries or any of
         their properties;

                  (viii)   No consent, approval, authorization, order, filing,
         registration or qualification of or with any such federal or
         Massachusetts court or governmental agency or body is required for the
         issue and sale of the Shares or the consummation by the Company of the
         transactions contemplated by this Agreement, except the registration
         under the Act of the Shares, and such consents, approvals,
         authorizations, filings, registrations or qualifications as may be
         required under state securities or Blue Sky laws in connection with the
         purchase and distribution of the Shares by the Underwriters;

                  (ix)     The statements set forth in the Prospectus under the
         caption "Description of Capital Stock", insofar as they purport to
         constitute a summary of the terms of the Stock and under the captions
         "Shares Eligible for Future Sale" and "Underwriting", insofar as they
         purport to describe the provisions of the laws and documents referred
         to therein, are accurate, complete and fair in all material respects;

                  (x)      The Company is not an "investment company", as such
         term is defined in the Investment Company Act;

                  (xi)     The Registration Statement and the Prospectus and any
         further amendments and supplements thereto made by the Company prior to
         such Time of Delivery (other than the financial statements and related
         schedules and other financial and accounting data therein, as to which
         such counsel need express no opinion) comply


<PAGE>

         as to form in all material respects with the requirements of the Act
         and the rules and regulations thereunder; although they do not assume
         any responsibility for the accuracy, completeness or fairness of the
         statements contained in the Registration Statement or the Prospectus,
         except for those referred to in the opinion in subsection (viii) of
         this section 7(c), they have no reason to believe that, as of its
         effective date, the Registration Statement or any further amendment
         thereto made by the Company prior to such Time of Delivery (other than
         the financial statements and related schedules and other financial and
         accounting data therein, as to which such counsel need express no
         opinion) contained an untrue statement of a material fact or omitted to
         state a material fact required to be stated therein or necessary to
         make the statements therein not misleading or that, as of its date, the
         Prospectus or any further amendment or supplement thereto made by the
         Company prior to such Time of Delivery (other than the financial
         statements and related schedules and other financial and accounting
         data therein, as to which such counsel need express no opinion)
         contained an untrue statement of a material fact or omitted to state a
         material fact necessary to make the statements therein, in the light of
         the circumstances under which they were made, not misleading or that,
         as of such Time of Delivery, either the Registration Statement or the
         Prospectus or any further amendment or supplement thereto made by the
         Company prior to such Time of Delivery (other than the financial
         statements and related schedules and other financial and accounting
         data therein, as to which such counsel need express no opinion)
         contains an untrue statement of a material fact or omits to state a
         material fact necessary to make the statements therein, in the light of
         the circumstances under which they were made, not misleading; and they
         do not know of any amendment to the Registration Statement required to
         be filed or of any contracts or other documents of a character required
         to be filed as an exhibit to the Registration Statement or required to
         be described in the Registration Statement or the Prospectus which are
         not filed or described as required; and

                  (xii)    The Registration Statement has become effective under
         the Act. To the best of such counsel's knowledge, no stop order
         suspending the effectiveness of the Registration Statement has been
         issued by the Commission nor has any proceeding been instituted for
         that purpose under the Act. The Prospectus has been filed with the
         Commission pursuant to Rule 424(b) of the rules and regulations under
         the Act within the time period required thereby.

         (d)      On the date of the Prospectus at a time prior to the execution
of this Agreement, at 9:30 a.m., New York City time, on the effective date of
any post-effective amendment to the Registration Statement filed subsequent to
the date of this Agreement and also at each Time of Delivery, Arthur Andersen
LLP shall have furnished to you a letter or letters, dated the respective dates
of delivery thereof, in form and substance satisfactory to you, to the effect
set forth in Annex I hereto (the executed copy of the letter delivered prior to
the execution of this Agreement is attached as Annex I(a) hereto and a draft of
the form of letter to be delivered on the effective date of any post-effective
amendment to the Registration Statement and as of each Time of Delivery is
attached as Annex I(b) hereto);

         (e)      (i) Neither the Company nor any of its subsidiaries shall have
sustained since the date of the latest audited financial statements included in
the Prospectus any loss or interference with its business from fire, explosion,
flood or other calamity, whether or not covered by insurance, or from any labor
dispute or court or governmental action, order or decree, otherwise than as set
forth or contemplated in the Prospectus, and (ii) since the


<PAGE>

respective dates as of which information is given in the Prospectus there shall
not have been any change in the capital stock or long-term debt of the Company
or any of its subsidiaries or any change, or any development involving a
prospective change, in or affecting the business, assets, management, financial
position, stockholders' equity or results of operations of the Company and its
subsidiaries taken as a whole, otherwise than as set forth or contemplated in
the Prospectus, the effect of which, in any such case described in clause (i) or
(ii), is in the judgment of the Representatives so material and adverse as to
make it impracticable or inadvisable to proceed with the public offering or the
delivery of the Shares being delivered at such Time of Delivery on the terms and
in the manner contemplated in the Prospectus;

         (f)      On or after the date hereof there shall not have occurred any
of the following: (i) a suspension or material limitation in trading in
securities generally on the New York Stock Exchange or on NASDAQ; (ii) a
suspension or material limitation in trading in the Company's securities on
NASDAQ; (iii) a general moratorium on commercial banking activities declared by
either Federal or New York or Massachusetts state authorities; or (iv) the
outbreak or escalation of hostilities involving the United States or the
declaration by the United States of a national emergency or war, if the effect
of any such event specified in this clause (iv) in the judgment of the
Representatives makes it impracticable or inadvisable to proceed with the public
offering or the delivery of the Shares being delivered at such Time of Delivery
on the terms and in the manner contemplated in the Prospectus;

         (g)      The Shares to be sold at such Time of Delivery shall have been
duly listed for quotation on NASDAQ;

         (h)      The Company has obtained and delivered to the Underwriters
executed copies of an agreement from the stockholders of the Company listed on
Schedule II hereto, substantially to the effect set forth in Subsection 5(e)
hereof in form and substance satisfactory to you;

         (i)      The Company shall have complied with the provisions of Section
5(c) hereof with respect to the furnishing of prospectuses on the New York
Business Day next succeeding the date of this Agreement;

         (j)      Beachcroft Wansbroughs, local counsel for Sonus Networks
Limited, a United Kingdom corporation (the "FOREIGN SUBSIDIARY"), shall have
furnished to you their written opinion (a draft of such opinion is attached as
Annex II(c) hereto), dated such Time of Delivery, in form and substance
satisfactory to you, to the effect that:

                  (i)  The Foreign Subsidiary has been duly incorporated and
                       is validly existing as a corporation in good standing
                       under the laws of the United Kingdom; and

                  (ii) All of the issued shares of capital stock of the
                       Foregin Subsidiary have been duly authorized and validly
                       issued, are fully paid and nonassessable, and are owned
                       directly or indirectly by the Company, free and clear of
                       all liens, encumbrances, equities or claims to the
                       knowledge of such counsel;

         (k)      The Company shall have furnished or caused to be furnished to
you at such Time of Delivery certificates of officers of the Company
satisfactory to you as to the accuracy of the representations and warranties of
the Company herein at and as of such Time of Delivery, as to the performance by
the Company of all of its obligations hereunder to be performed at or prior to
such Time of Delivery, as to the matters set forth in subsections (a) and (e) of
this Section and as to such other matters as you may reasonably request.

8.       (a)      The Company will indemnify and hold harmless each Underwriter
against any losses, claims, damages or liabilities, joint or several, to which
such Underwriter may become subject,


<PAGE>

under the Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon an
untrue statement or alleged untrue statement of a material fact contained in any
Preliminary Prospectus, the Registration Statement or the Prospectus, or any
amendment or supplement thereto, or arise out of or are based upon the 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 each Underwriter for any legal or other expenses reasonably incurred
by such Underwriter in connection with investigating or defending any such
action or claim as such expenses are incurred; PROVIDED, HOWEVER, that the
Company shall not be liable in any such case to the extent that any such loss,
claim, damage or liability arises out of or is based upon an untrue statement or
alleged untrue statement or omission or alleged omission made in any Preliminary
Prospectus, the Registration Statement or the Prospectus or any such amendment
or supplement in reliance upon and in conformity with written information
furnished to the Company by any Underwriter through Goldman, Sachs & Co.
expressly for use therein.

         (b)      Each Underwriter will indemnify and hold harmless the Company
against any losses, claims, damages or liabilities to which the Company may
become subject, under the Act or otherwise, insofar as such losses, claims,
damages or liabilities (or actions in respect thereof) arise out of or are based
upon an untrue statement or alleged untrue statement of a material fact
contained in any Preliminary Prospectus, the Registration Statement or the
Prospectus, or any amendment or supplement thereto, or arise out of or are based
upon the omission or alleged omission to state therein a material fact required
to be stated therein or necessary to make the statements therein not misleading,
in each case to the extent, but only to the extent, that such untrue statement
or alleged untrue statement or omission or alleged omission was made in any
Preliminary Prospectus, the Registration Statement or the Prospectus or any such
amendment or supplement in reliance upon and in conformity with written
information furnished to the Company by such Underwriter through Goldman, Sachs
& Co. expressly for use therein; and will reimburse the Company for any legal or
other expenses reasonably incurred by the Company in connection with
investigating or defending any such action or claim as such expenses are
incurred.

         (c)      Promptly after receipt by an indemnified party under
subsection (a) or (b) above of notice of the commencement of any action, such
indemnified party shall, if a claim in respect thereof is to be made against the
indemnifying party under such subsection, notify the indemnifying party in
writing of the commencement thereof; but the omission so to notify the
indemnifying party shall not relieve it from any liability which it may have to
any indemnified party otherwise than under such subsection. In case any such
action shall be brought against any indemnified party and it shall notify the
indemnifying party of the commencement thereof, the indemnifying party shall be
entitled to participate therein and, to the extent that it shall wish, jointly
with any other indemnifying party similarly notified, to assume the defense
thereof, with counsel satisfactory to such indemnified party (who shall not,
except with the consent of the indemnified party, be counsel to the indemnifying
party), and, after notice from the indemnifying party to such indemnified party
of its election so to assume the defense thereof, the indemnifying party shall
not be liable to such indemnified party under such subsection for any legal
expenses of other counsel or any other expenses, in each case subsequently
incurred by such indemnified party, in connection with the defense thereof other
than reasonable costs of investigation. No indemnifying party shall, without the
written consent of the indemnified party, effect the settlement or compromise
of, or consent to the entry of any judgment with respect to, any pending or
threatened action or claim in respect of which indemnification or contribution
may be sought hereunder (whether or not the indemnified party is an actual or
potential party to


<PAGE>

such action or claim) unless such settlement, compromise or judgment (i)
includes an unconditional release of the indemnified party from all liability
arising out of such action or claim and (ii) does not include a statement as to
or an admission of fault, culpability or a failure to act, by or on behalf of
any indemnified party.

         (d)      If the indemnification provided for in this Section 8 is
unavailable to or insufficient to hold harmless an indemnified party under
subsection (a) or (b) above in respect of any losses, claims, damages or
liabilities (or actions in respect thereof) referred to therein, then each
indemnifying party shall contribute to the amount paid or payable by such
indemnified party as a result of such losses, claims, damages or liabilities (or
actions in respect thereof) in such proportion as is appropriate to reflect the
relative benefits received by the Company on the one hand and the Underwriters
on the other from the offering of the Shares. If, however, the allocation
provided by the immediately preceding sentence is not permitted by applicable
law or if the indemnified party failed to give the notice required under
subsection (c) above, then each indemnifying party shall contribute to such
amount paid or payable by such indemnified party in such proportion as is
appropriate to reflect not only such relative benefits but also the relative
fault of the Company on the one hand and the Underwriters on the other in
connection with the statements or omissions which resulted in such losses,
claims, damages or liabilities (or actions in respect thereof), as well as any
other relevant equitable considerations. The relative benefits received by the
Company on the one hand and the Underwriters on the other shall be deemed to be
in the same proportion as the total net proceeds from the offering (before
deducting expenses) received by the Company bear to the total underwriting
discounts and commissions received by the Underwriters, in each case as set
forth in the table on the cover page of the Prospectus. The relative fault shall
be determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact relates to information supplied by the Company on the one hand
or the Underwriters on the other and the parties' relative intent, knowledge,
access to information and opportunity to correct or prevent such statement or
omission. The Company and the Underwriters agree that it would not be just and
equitable if contributions pursuant to this subsection (d) were determined by
PRO RATA allocation (even if the Underwriters were treated as one entity for
such purpose) or by any other method of allocation which does not take account
of the equitable considerations referred to above in this subsection (d). The
amount paid or payable by an indemnified party as a result of the losses,
claims, damages or liabilities (or actions in respect thereof) referred to above
in this subsection (d) shall be deemed to include any legal or other expenses
reasonably incurred by such indemnified party in connection with investigating
or defending any such action or claim. Notwithstanding the provisions of this
subsection (d), no Underwriter shall be required to contribute any amount in
excess of the amount by which the total price at which the Shares underwritten
by it and distributed to the public were offered to the public exceeds the
amount of any damages which such Underwriter has otherwise been required to pay
by reason of such untrue or alleged untrue statement or omission or alleged
omission. No person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Act) shall be entitled to contribution from any person
who was not guilty of such fraudulent misrepresentation. The Underwriters'
obligations in this subsection (d) to contribute are several in proportion to
their respective underwriting obligations and not joint.

         (e)      The obligations of the Company under this Section 8 shall be
in addition to any liability which the Company may otherwise have and shall
extend, upon the same terms and conditions, to each person, if any, who controls
any Underwriter within the meaning of the Act; and the obligations of the
Underwriters under this Section 8 shall be in addition to any liability


<PAGE>

which the respective Underwriters may otherwise have and shall extend, upon the
same terms and conditions, to each officer and director of the Company
(including any person who, with his or her consent, is named in the Registration
Statement as about to become a director of the Company) and to each person, if
any, who controls the Company within the meaning of the Act.

9.       (a)      If any Underwriter shall default in its obligation to purchase
the Shares which it has agreed to purchase hereunder at a Time of Delivery, you
may in your discretion arrange for you or another party or other parties to
purchase such Shares on the terms contained herein. If within thirty-six hours
after such default by any Underwriter you do not arrange for the purchase of
such Shares, then the Company shall be entitled to a further period of
thirty-six hours within which to procure another party or other parties
satisfactory to you to purchase such Shares on such terms. In the event that,
within the respective prescribed periods, you notify the Company that you have
so arranged for the purchase of such Shares, or the Company notifies you that it
has so arranged for the purchase of such Shares, you or the Company shall have
the right to postpone such Time of Delivery for a period of not more than seven
days, in order to effect whatever changes may thereby be made necessary in the
Registration Statement or the Prospectus, or in any other documents or
arrangements, and the Company agrees to file promptly any amendments to the
Registration Statement or the Prospectus which in your opinion may thereby be
made necessary. The term "Underwriter" as used in this Agreement shall include
any person substituted under this Section with like effect as if such person had
originally been a party to this Agreement with respect to such Shares.

         (b)      If, after giving effect to any arrangements for the purchase
of the Shares of a defaulting Underwriter or Underwriters by you and the Company
as provided in subsection (a) above, the aggregate number of such Shares which
remains unpurchased does not exceed one-eleventh of the aggregate number of all
the Shares to be purchased at such Time of Delivery, then the Company shall have
the right to require each non-defaulting Underwriter to purchase the number of
shares which such Underwriter agreed to purchase hereunder at such Time of
Delivery and, in addition, to require each non-defaulting Underwriter to
purchase its pro rata share (based on the number of Shares which such
Underwriter agreed to purchase hereunder) of the Shares of such defaulting
Underwriter or Underwriters for which such arrangements have not been made; but
nothing herein shall relieve a defaulting Underwriter from liability for its
default.

         (c)      If, after giving effect to any arrangements for the purchase
of the Shares of a defaulting Underwriter or Underwriters by you and the Company
as provided in subsection (a) above, the aggregate number of such Shares which
remains unpurchased exceeds one-eleventh of the aggregate number of all the
Shares to be purchased at such Time of Delivery, or if the Company shall not
exercise the right described in subsection (b) above to require non-defaulting
Underwriters to purchase Shares of a defaulting Underwriter or Underwriters,
then this Agreement (or, with respect to the Second Time of Delivery, the
obligations of the Underwriters to purchase and of the Company to sell the
Optional Shares) shall thereupon terminate, without liability on the part of any
non-defaulting Underwriter or the Company, except for the expenses to be borne
by the Company and the Underwriters as provided in Section 6 hereof and the
indemnity and contribution agreements in Section 8 hereof; but nothing herein
shall relieve a defaulting Underwriter from liability for its default.

10.  The respective indemnities, agreements, representations, warranties and
other statements of the Company and the several Underwriters, as set forth in
this Agreement or made by or on behalf


<PAGE>

of them, respectively, pursuant to this Agreement, shall remain in full force
and effect, regardless of any investigation (or any statement as to the results
thereof) made by or on behalf of any Underwriter or any controlling person of
any Underwriter, or the Company, or any officer or director or controlling
person of the Company, and shall survive delivery of and payment for the Shares.

11.  If this Agreement shall be terminated pursuant to Section 9 hereof, the
Company shall not then be under any liability to any Underwriter except as
provided in Sections 6 and 8 hereof; but, if for any other reason, any Shares
are not delivered by or on behalf of the Company as provided herein, the Company
will reimburse the Underwriters through you for all out-of-pocket expenses
approved in writing by you, including fees and disbursements of counsel, in each
case reasonably incurred by the Underwriters in making preparations for the
purchase, sale and delivery of the Shares not so delivered, but the Company
shall then be under no further liability to any Underwriter except as provided
in Sections 6 and 8 hereof.

12.  In all dealings hereunder, you shall act on behalf of each of the
Underwriters, and the parties hereto shall be entitled to act and rely upon any
statement, request, notice or agreement on behalf of any Underwriter made or
given by you jointly or by Goldman, Sachs & Co. on behalf of you as the
representatives.

         All statements, requests, notices and agreements hereunder shall be in
writing, and if to the Underwriters shall be delivered or sent by mail, telex or
facsimile transmission to you as the representatives in care of Goldman, Sachs &
Co., One Liberty Plaza, 7th Floor, New York, New York 10006, Attention:
Registration Department; and if to the Company shall be delivered or sent by
mail to the address of the Company set forth in the Registration Statement,
Attention: Secretary; provided, however, that any notice to an Underwriter
pursuant to Section 8(c) hereof shall be delivered or sent by mail, telex or
facsimile transmission to such Underwriter at its address set forth in its
Underwriters' Questionnaire, or telex constituting such Questionnaire, which
address will be supplied to the Company by you upon request. Any such
statements, requests, notices or agreements shall take effect upon receipt
thereof.

13.  This Agreement shall be binding upon, and inure solely to the benefit of,
the Underwriters, the Company and, to the extent provided in Sections 8 and 10
hereof, the officers and directors of the Company and each person who controls
the Company or any Underwriter, and their respective heirs, executors,
administrators, successors and assigns, and no other person shall acquire or
have any right under or by virtue of this Agreement. No purchaser of any of the
Shares from any Underwriter shall be deemed a successor or assign by reason
merely of such purchase.

14.  Time shall be of the essence of this Agreement. As used herein, the term
"business day" shall mean any day when the Commission's office in Washington,
D.C. is open for business.

15.  This Agreement shall be governed by and construed in accordance with the
laws of the State of New York.

16.  This Agreement may be executed by any one or more of the parties hereto in
any number of counterparts, each of which shall be deemed to be an original, but
all such counterparts shall together constitute one and the same instrument.


<PAGE>

         If the foregoing is in accordance with your understanding, please sign
and return to us one for the Company and each of the Representatives plus one
for each counsel counterparts hereof, and upon the acceptance hereof by you, on
behalf of each of the Underwriters, this letter and such acceptance hereof shall
constitute a binding agreement between each of the Underwriters and the Company.
It is understood that your acceptance of this letter on behalf of each of the
Underwriters is pursuant to the authority set forth in a form of Agreement among
Underwriters, the form of which shall be submitted to the Company for
examination upon request, but without warranty on your part as to the authority
of the signers thereof.

                                         Very truly yours,

                                         Sonus Networks, Inc.

                                         By:
                                             --------------------------------
                                             Name:  Stephen J. Nill
                                             Title: VP and CFO

Accepted as of the date hereof:

Goldman, Sachs & Co.
FleetBoston Robertson Stephens Inc.
Lehman Brothers Inc.
J.P. Morgan Securities Inc.



By:.....................................
         (Goldman, Sachs & Co.)

    On behalf of each of the Underwriters


<PAGE>

                                   SCHEDULE I

<TABLE>
<CAPTION>

                                                                                            NUMBER OF OPTIONAL
                                                                                            SHARES TO BE
                                                                     TOTAL NUMBER OF        PURCHASED IF
                                                                     FIRM SHARES            MAXIMUM OPTION
UNDERWRITER                                                          TO BE PURCHASED        EXERCISED
-----------                                                          ---------------        ---------
<S>                                                                         <C>             <C>
Goldman, Sachs & Co...............................................          1,970,000       295,500
FleetBoston Robertson Stephens Inc................................            800,000       120,000
Lehman Brothers Inc...............................................            800,000       120,000
J.P. Morgan Securities............................................            800,000       120,000
George K. Baum & Company..........................................             90,000        13,500
Brad Peery Inc....................................................             90,000        13,500
Dain Rauscher Incorporated........................................             90,000        13,500
A.G. Edwards & Sons, Inc..........................................             90,000        13,500
Tucker Anthony Incorporated.......................................             90,000        13,500
SoundView Technology Group Inc....................................             90,000        13,500
W.R. Hambrecht + Co., LLC.........................................             90,000        13,500

              Total...............................................          5,000,000       750,000

</TABLE>




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