MCK COMMUNICATIONS INC
S-1/A, 1999-10-18
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>   1


    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON OCTOBER 18, 1999


                                            REGISTRATION STATEMENT NO. 333-85821

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

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------


                                AMENDMENT NO. 5


                                       TO

                                    FORM S-1
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                            ------------------------

                            MCK COMMUNICATIONS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<TABLE>
<S>                                <C>                                <C>
             DELAWARE                             3661                            06-1555163
   (STATE OR OTHER JURISDICTION       (PRIMARY STANDARD INDUSTRIAL             (I.R.S. EMPLOYER
OF INCORPORATION OR ORGANIZATION)     CLASSIFICATION CODE NUMBER)            IDENTIFICATION NO.)
</TABLE>

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

                             313 WASHINGTON STREET
                          NEWTON, MASSACHUSETTS 02458
                                 (617) 454-6100
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                    REGISTRANT'S PRINCIPAL EXECUTIVE OFFICE)
                            ------------------------

                                STEVEN J. BENSON
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                            MCK COMMUNICATIONS, INC.
                             313 WASHINGTON STREET
                          NEWTON, MASSACHUSETTS 02458
                                 (617) 454-6100
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                            ------------------------

                                   COPIES TO:

<TABLE>
<S>                                                 <C>
              JOHN J. EGAN III, P.C.                              MICHAEL A. CONZA, ESQ.
               JOHN B. STEELE, ESQ.                           TESTA, HURWITZ & THIBEAULT LLP
              MCDERMOTT, WILL & EMERY                                 125 HIGH STREET
                  28 STATE STREET                               BOSTON, MASSACHUSETTS 02110
         BOSTON, MASSACHUSETTS 02109-1775                             (617) 248-7000
                  (617) 535-4000
</TABLE>

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

    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after this Registration Statement becomes effective.

    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box. [ ]
- ------------

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [ ]
- ------------

    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]
- ------------

    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]
- ------------

    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]

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

    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE SEC, ACTING PURSUANT TO SECTION 8(a), MAY
DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2


                                EXPLANATORY NOTE



     This Amendment No. 5 to the Registration Statement on Form S-1 is being
filed solely for the purpose of amending certain exhibits.


                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 13.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     The following table sets forth the estimated expenses payable by us in
connection with the offering (excluding underwriting discounts and commissions):

<TABLE>
<CAPTION>
NATURE OF EXPENSE                                               AMOUNT
- -----------------                                             ----------
<S>                                                           <C>
SEC Registration Fee........................................  $   17,392
NASD Filing Fee.............................................       6,756
Nasdaq National Market Listing Fee..........................      90,000
Accounting Fees and Expenses................................     250,000
Legal Fees and Expenses.....................................     400,000
Printing Expenses...........................................     100,000
Blue Sky Qualification Fees and Expenses....................      15,000
Transfer Agent's Fee........................................      10,000
Miscellaneous...............................................     210,852
                                                              ----------
Total.......................................................  $1,100,000
</TABLE>

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

     The amounts set forth above, except for the Securities and Exchange
Commission, National Association of Securities Dealers, Inc. and Nasdaq National
Market fees, are in each case estimated.

ITEM 14.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

     In accordance with Section 145 of the Delaware General Corporation Law,
Article VII of our amended and restated certificate of incorporation provides
that no director of MCK Communications be personally liable to MCK
Communications, its stockholders for monetary damages for breach of fiduciary
duty as a director, except for liability (1) for any breach of the director's
duty of loyalty to MCK Communications or its stockholders, (2) for acts or
omissions not in good faith or which involve intentional misconduct or a knowing
violation of law, (3) in respect of unlawful dividend payments or stock
redemptions or repurchases, or (4) for any transaction from which the director
derived an improper personal benefit. In addition, the first amended and
restated certificate of incorporation provides that if the Delaware General
Corporation Law is amended to authorize the further elimination or limitation of
the liability of directors, then the liability of a director of the corporation
shall be eliminated or limited to the fullest extent permitted by the Delaware
General Corporation Law, as so amended.

     Article V of our amended and restated by-laws provides for indemnification
by MCK Communications of its officers and certain non-officer employees under
certain circumstances against expenses, including attorneys fees, judgments,
fines and amounts paid in settlement, reasonably incurred in connection with the
defense or settlement of any threatened, pending or completed legal proceeding
in which any such person is involved by reason of the fact that such person is
or was an officer or employee of the registrant if such person acted in good
faith and in a manner he or she reasonably believed to be in or not opposed to
the best interests of MCK Communications, and, with respect to criminal actions
or proceedings, if such person had no reasonable cause to believe his or her
conduct was unlawful.

     Under Section 7 of the underwriting agreement to be filed as Exhibit 1.1
hereto, the underwriters have agreed to indemnify, under certain conditions, MCK
Communications, its directors, certain officers and persons who control MCK
Communications within the meaning of the Securities Act against certain
liabilities.

                                      II-1
<PAGE>   3

ITEM 15.  RECENT SALES OF UNREGISTERED SECURITIES

     Set forth in chronological order below is information regarding the number
of shares of capital stock issued by the Registrant during the past three years.
Further included is the consideration, if any, received by the Registrant for
such shares, and information relating to the section of the Securities Act or
rule of the Securities and Exchange Commission under which exemption from
registration was claimed.

     1. An aggregate of 1,652,400 shares of Series A preferred stock (which are
        subject to redemption, and will be redeemed, upon the completion of this
        initial public offering) were issued in a private placement in July 1998
        to investment funds associated with Summit Partners. The consideration
        received for such shares was $1,652,400.

     2. An aggregate of 28,505 shares of Series C preferred stock (which are
        subject to redemption, and will be redeemed, upon the completion of this
        initial public offering) was issued in a private placement in July 1998
        to investment funds associated with Lazard Freres, and certain other
        purchasers, pursuant to a Stock Purchase Agreement. The consideration
        received for such shares was $2,500,000.

     3. An aggregate of 1,672,354 shares of Series D preferred stock (which are
        convertible into 2,558,702 shares of common stock) was issued in a
        private placement in July 1998 to investment funds associated with
        Lazard Freres, and certain other purchasers, pursuant to a Stock
        Purchase Agreement. The consideration received for such shares was
        $2,500,000.

     4. From January 1998 to September 1999, an aggregate of 2,081,328 shares of
        common stock was sold to certain directors and key executives of MCK
        Communications pursuant to Stock Restriction Agreements and a Stock
        Purchase Agreement for prices ranging from $.098 to $8.17 per share. The
        aggregate consideration received for such shares was $1,099,551.75.

     5. From June 1996 to September 1999, MCK Communications granted stock
        options to purchase an aggregate of 2,137,913 shares of common stock to
        directors, employees and consultants with exercise prices ranging from
        $.001 to $2.50 per share pursuant to MCK Communications 1996 Stock
        Option Plan. As of September 30, 1999, 630,446 shares of common stock
        have been issued upon exercise of options.

     6. Prior to August 1996, we sold several series of preferred stock to
        investment funds associated with Summit Partners and certain entities
        associated with Wilson, Sonsini, Goodrich and Rosati, P.C. For
        additional information regarding the sale of preferred stock to the
        Summit Partners Group, see "Certain Transactions with Related Parties."

     No underwriters were used in connection with these sales and issuances. The
sales and issuances of these securities were exempt from registration under the
Securities Act pursuant to Rule 701 promulgated thereunder on the basis that
these securities were offered and sold either pursuant to a written compensatory
benefit plan or pursuant to written contracts relating to compensation, as
provided by Rule 701, or pursuant to Section 4(2) of the Securities Act on the
basis that the transactions did not involve a public offering.

ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

     (a) Exhibits

<TABLE>
<C>       <S>
   **1.1  Form of Underwriting Agreement.
   **2.1  Stock and Note Purchase Agreement, dated as of June 27,
          1996, by and among MCK Communications, Inc., MCK
          Telecommunications, Inc., Cal Manz, Manz Developments, Inc.
          and the Investors named therein (excluding schedules, which
          the Registrant agrees to furnish supplementally to the
          Commission upon request).
</TABLE>

                                      II-2
<PAGE>   4


<TABLE>
<C>         <S>
     **2.2  Stock Purchase Agreement, dated as of July 16, 1998, by and among MCK Communications, Inc. and the
            Purchasers named therein (excluding schedules, which the Registrant agrees to furnish supplementally to
            the Commission upon request).
     **3.1  Certificate of Incorporation of the Registrant.
     **3.2  Form of First Amended and Restated Certificate of Incorporation of the Registrant (to be filed prior to
            the effectiveness of the offering).
     **3.3  Form of Second Amended and Restated Certificate of Incorporation of the Registrant (to be filed
            following the consummation of this offering).
     **3.4  By-laws of the Registrant.
     **3.5  Form of First Amended and Restated By-laws of the Registrant (to be effective upon consummation of the
            offering).
     **4.1  Specimen certificate for shares of common stock, $.001 par value, of the Registrant.
     **5.1  Opinion of McDermott, Will & Emery as to the validity of the securities being offered.
    **10.1  Amended and Restated Stockholders' Agreement, dated July 16, 1998, between the Registrant and the
            Stockholders named therein.
    **10.2  Amended and Restated Registration Rights Agreement, dated July 16, 1998, between the Registrant and the
            Stockholders named therein.
    **10.3  Amended and Restated 1996 Stock Option Plan of the Registrant.
    **10.4  1999 Stock Option and Grant Plan of the Registrant.
    **10.5  Class A Subordinated Promissory Note issued by MCK Communications, Inc. to WS Investment Company 96A in
            the amount of $8,750 dated June 27, 1996.
    **10.6  Class A Subordinated Promissory Note issued by MCK Communications, Inc. to Trustee, WSGR Retirement
            Plan FBO Jeffery D. Saper in the amount of $16,250 dated June 27, 1996.
    **10.7  Class A Subordinated Promissory Note issued by MCK Communications, Inc. to Summit Subordinated Debt
            Fund, L.P. in the amount of $4,875,500 dated June 27, 1996.
    **10.8  Class A Subordinated Promissory Note issued by MCK Communications, Inc. to Summit Investors III in the
            amount of $99,500 dated June 27, 1996.
    **10.9  Form of Stock Restriction Agreement for sale of restricted stock to executive officers.
   **10.10  Form of Promissory Note for purchase of restricted stock by executive officers.
   **10.11  Form of Pledge Agreement.
   **10.12  Form of Bonus Agreement.
   **10.13  Lease Agreement between Manz Developments, Inc. and MCK Telecommunications, Inc. dated January 1, 1996.
   **10.14  Office Lease between MCK Communications, Inc. and 313 Washington Street, LLC dated June 2, 1997, as
            amended April 22, 1998 and June 30, 1998.
    +10.15  Agreement between MCK Communications, Inc. and Lucent Technologies, Inc. effective as of April 30,
            1999.
    +10.16  Master Support Agreement between MCK Communications, Inc. and Vital Networks, Inc. dated June 28, 1999.
   **10.17  Amended and Restated Loan and Security Agreement between MCK Communications, Inc. and BankBoston, N.A.
            dated July 1, 1999.
    **16.1  Letter regarding change in certifying accountants
    **23.1  Consent of McDermott, Will & Emery (included in Exhibit 5.1 hereto).
    **23.2  Consent of Ernst & Young LLP.
    **23.3  Consent of PricewaterhouseCoopers LLP
</TABLE>


                                      II-3
<PAGE>   5
<TABLE>
<C>       <S>
  **24.1  Powers of Attorney (included on page II-5).
  **27.1  Financial Data Schedule.
</TABLE>

- ---------------
** Previously filed.

 + Confidential treatment requested as to portions of this exhibit. The
   confidential information has been filed separately with the Securities and
   Exchange Commission.


     (b) Consolidated Financial Statement Schedules

     All schedules have been omitted because they are not required or because
the required information is given in the Consolidated Financial Statements or
Notes to those statements.

ITEM 17.  UNDERTAKINGS

     The undersigned registrant hereby undertakes to provide to the underwriters
at the closing specified in the Underwriting Agreement certificates in such
denominations and registered in such names as required by the underwriters to
permit prompt delivery to each purchaser.

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act, and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the registrant of expenses incurred
or paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

     The undersigned registrant hereby undertakes that:

          (1) For purposes of determining any liability under the Securities Act
     of 1933, the information omitted from the form of prospectus filed as part
     of this registration statement in reliance upon Rule 430A and contained in
     a form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     registration statement as of the time it was declared effective.

          (2) For the purpose of determining any liability under the Securities
     Act of 1933, each post-effective amendment that contains a form of
     prospectus shall be deemed to be a new registration statement relating to
     the securities offered therein, and the offering of such securities at that
     time shall be deemed to be the initial bona fide offering thereof.

                                      II-4
<PAGE>   6

                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Amendment No. 5 to the Registration Statement to be signed
on its behalf by the undersigned, thereunto duly authorized, in the City of
Newton, Commonwealth of Massachusetts, on October 18, 1999.


                                          MCK COMMUNICATIONS, INC.

                                          By:     /s/ STEVEN J. BENSON
                                            ------------------------------------
                                                      Steven J. Benson
                                                  Chief Executive Officer


     Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 5 to the Registration Statement has been signed below by the following
persons in the capacities and on the dates indicated.



<TABLE>
<CAPTION>
                     SIGNATURE                                    TITLE                       DATE
                     ---------                                    -----                       ----
<C>                                                  <S>                               <C>
               /s/ STEVEN J. BENSON                  President, Chief Executive          October 18, 1999
- ---------------------------------------------------    Officer and Director
                 Steven J. Benson                      (Principal Executive Officer)

                         *                           Chief Financial Officer             October 18, 1999
- ---------------------------------------------------    (Principal Financial Officer
                   Paul K. Zurlo                       and Principal Accounting
                                                       Officer)

                         *                           Director                            October 18, 1999
- ---------------------------------------------------
                  Calvin K. Manz

                         *                           Director                            October 18, 1999
- ---------------------------------------------------
                  John B. Landry

                         *                           Director                            October 18, 1999
- ---------------------------------------------------
                  Gregory M. Avis

                         *                           Director                            October 18, 1999
- ---------------------------------------------------
                Michael H. Balmuth

                         *                           Director                            October 18, 1999
- ---------------------------------------------------
                   Paul Severino

            * By: /s/ STEVEN J. BENSON
   --------------------------------------------
                 Attorney-in-fact
</TABLE>


                                      II-5
<PAGE>   7

                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
EXHIBIT
 NUMBER                        EXHIBIT DESCRIPTION
- --------                       -------------------
<C>        <S>
   **1.1   Form of Underwriting Agreement.
   **2.1   Stock and Note Purchase Agreement, dated as of June 27,
           1996, by and among MCK Communications, Inc., MCK
           Telecommunications, Inc., Cal Manz, Manz Developments, Inc.
           and the Investors named therein (excluding schedules, which
           the Registrant agrees to furnish supplementally to the
           Commission upon request).
   **2.2   Stock Purchase Agreement, dated as of July 16, 1998, by and
           among MCK Communications, Inc. and the Purchasers named
           therein (excluding schedules, which the Registrant agrees to
           furnish supplementally to the Commission upon request).
   **3.1   Certificate of Incorporation of the Registrant.
   **3.2   Form of First Amended and Restated Certificate of
           Incorporation of the Registrant (to be filed prior to
           effectiveness of the offering).
   **3.3   Form of Second Amended and Restated Certificate of
           Incorporation of the Registrant (to be filed following the
           consummation of this offering).
   **3.4   By-laws of the Registrant.
   **3.5   Form of First Amended and Restated By-laws of the Registrant
           (to be effective upon consummation of the offering).
   **4.1   Specimen certificate for shares of common stock, $.001 par
           value, of the Registrant.
   **5.1   Opinion of McDermott, Will & Emery as to the validity of the
           securities being offered.
  **10.1   Amended and Restated Stockholders' Agreement, dated July 16,
           1998, between the Registrant and the Stockholders named
           therein.
  **10.2   Amended and Restated Registration Rights Agreement, dated
           July 16, 1998, between the Registrant and the Stockholders
           named therein.
  **10.3   Amended and Restated 1996 Stock Option Plan of the
           Registrant.
  **10.4   1999 Stock Option and Grant Plan of the Registrant.
  **10.5   Class A Subordinated Promissory Note issued by MCK
           Communications, Inc. to WS Investment Company 96A in the
           amount of $8,750 dated June 27, 1996.
  **10.6   Class A Subordinated Promissory Note issued by MCK
           Communications, Inc. to Trustee, WSGR Retirement Plan FBO
           Jeffery D. Saper in the amount of $16,250 dated June 27,
           1996.
  **10.7   Class A Subordinated Promissory Note issued by MCK
           Communications, Inc. to Summit Subordinated Debt Fund, L.P.
           in the amount of $4,875,500 dated June 27, 1996.
  **10.8   Class A Subordinated Promissory Note issued by MCK
           Communications, Inc. to Summit Investors III in the amount
           of $99,500 dated June 27, 1996.
  **10.9   Form of Stock Restriction Agreement for sale of restricted
           stock to executive officers.
 **10.10   Form of Promissory Note for purchase of restricted stock by
           executive officers.
 **10.11   Form of Pledge Agreement.
 **10.12   Form of Bonus Agreement.
 **10.13   Lease Agreement between Manz Developments, Inc. and MCK
           Telecommunications, Inc. dated January 1, 1996.
 **10.14   Office Lease between MCK Communications, Inc. and 313
           Washington Street, LLC dated June 2, 1997, as amended April
           22, 1998 and June 30, 1998.
  +10.15   Agreement between MCK Communications, Inc. and Lucent
           Technologies, Inc. effective as of April 30, 1999.
  +10.16   Master Support Agreement between MCK Communications, Inc.
           and Vital Networks, Inc. dated June 28, 1999.
</TABLE>

<PAGE>   8


<TABLE>
<CAPTION>
EXHIBIT
 NUMBER                        EXHIBIT DESCRIPTION
- --------                       -------------------
<C>        <S>
 **10.17   Amended and Restated Loan and Security Agreement between MCK
           Communications, Inc. and BankBoston, N.A. dated July 1,
           1999.
  **16.1   Letter regarding change in certifying accountants
  **23.1   Consent of McDermott, Will & Emery (included in Exhibit 5.1
           hereto).
  **23.2   Consent of Ernst & Young LLP.
  **23.3   Consent of PricewaterhouseCoopers LLP
  **24.1   Powers of Attorney (included on page II-5).
  **27.1   Financial Data Schedule.
</TABLE>


- ---------------
** Previously filed.

 + Confidential treatment requested as to portions of this exhibit. The
   confidential information has been filed separately with the Securities and
   Exchange Commission.


<PAGE>   1
CONFIDENTIAL TREATMENT HAS BEEN REQUESTED FOR CERTAIN REDACTED PROVISIONS OF
THIS AGREEMENT. THE REDACTED PROVISIONS ARE IDENTIFIED BY THREE ASTERISKS AND
ENCLOSED BY BRACKETS. THE CONFIDENTIAL PORTION HAS BEEN FILED SEPARATELY WITH
THE SECURITIES AND EXCHANGE COMMISSION.


                                                                   EXHIBIT 10.15



                                                        Agreement No. WR71980064
                                                                   Sheet 1 of 32



MCK Communications, Inc.
313 Washington Street
Newton, MA 02158


This Agreement is made by and between Lucent Technologies Inc. ("Company")
having an office at 211 Mt. Airy Road, Basking Ridge, NJ 07920 and MCK
Communications, Inc. ("Supplier") having an office at 313 Washington Street,
Newton, MA 02158. Company agrees to purchase and Supplier agrees to sell in
accordance with the terms and conditions stated in this Agreement and any
attachments to this Agreement.

WHEREAS, Company wishes to purchase products of Supplier's (design and)
manufacture for resale to Company's customers, and

WHEREAS, Supplier desires to sell such materials to Company for resale to
Company's customers,

THEREFORE, the parties agree as follows

1.   AGREEMENT EFFECTIVE PERIOD
The term of this Agreement shall commence on April 30, 1999 and shall, except as
otherwise provided in this Agreement, continue in effect thereafter until April
30, 2002.

<PAGE>   2


                                                        Agreement No. WR71980064
                                                                  Sheet 2 of 31

2.   MATERIAL

     "MATERIAL" as used in this Agreement shall mean Supplier's DCP-based
     Extender product line as listed in APPENDIX A, attached and made a part of
     this Agreement. Such MATERIAL is hereby offered for sale by Supplier and
     may be purchased by Company in accordance with the terms, conditions and
     specifications stated in this Agreement. This Agreement is a non-commitment
     agreement and MATERIAL shall be furnished by Supplier on an as-ordered
     basis. "Specification(s)" as used in this Agreement shall mean all of the
     specifications made part of this Agreement.

3.   OPTION TO EXTEND

          Company shall have the right to extend the period specified in the
     section "AGREEMENT EFFECTIVE" for up to twelve (12) months by giving
     Supplier at least thirty (30) business days prior written notice.

          Within ten (10) business days of the date of Company's notice to
     extend the period, Supplier shall notify Company in writing whether
     Supplier proposes to revise the price(s) under this Agreement. If the
     parties fail to agree on the revised price(s) within twenty (20) business
     days after the date of Supplier's notice, Company's notice of extension
     shall be considered withdrawn and prices for outstanding orders or orders
     placed during the term of this Agreement shall not be revised.

4.   PRICE

          Prices and discounts shall be as shown in APPENDIX A. Prices as listed
     in APPENDIX A shall remain in effect during the term of this Agreement.

5.   COST REDUCTION

          Both parties shall endeavor to reduce the costs of products furnished
     under this Agreement. If design, labor or material cost reductions result
     from Company initiated changes or the sharing by Supplier of other Company
     supplier agreements, [***] of the cost reduction(s) shall be passed onto
     Company in the form of reduced prices, except that if the cost reduction
     results from Supplier initiated changes, Supplier shall furnish to Company
     a complete list of expenses that Supplier incurred in effecting said cost
     reduction, if any. Supplier shall be entitled to receive the benefits of
     the cost reduction for the time period required to recover its
     implementation expenses.

6.   BEST PRICE

          If, at any time during the term of this Agreement Supplier should sell
     to any customer other than to affiliates or subsidiaries of Supplier,
     material at least equal or similar quality (and volume] at a price lower
     than that in effect under this Agreement, Company shall pay the lower price
     on all deliveries of



[***]  Confidential treatment has been requested for the bracketed portions.
       The confidential redacted portion has been filed separately with the
       Securities and Exchange Commission.
<PAGE>   3
     MATERIAL which are made during the period when such lower price is in
     effect. Upon ten (10) days written notice, Company, or Company's authorized
     representatives, may audit Supplier's applicable books and records for the
     purpose of verifying Supplier's compliance with this provision.

7.   TERMS OF PAYMENT
          Net thirty (30) business days from the date of delivery of the
     MATERIAL to Company or receipt of the applicable invoice therefor by
     Company whichever occurs later.

8.   FORECASTS
          Company shall provide Supplier with a twelve (12) month non-binding
     forecast submitted to Supplier by the fifth (5th) business day of each
     calendar month. Such forecast shall be used by Supplier for planning
     purposes only and shall not be deemed a commitment by Company to purchase
     the MATERIAL shown in the forecast.

9.   FOB
          The MATERIAL shall be shipped FOB Supplier's location (or such other
     Supplier's location as may be designated by Supplier). Supplier shall
     notify Company's transportation representative on (303) 538-8278 or (303)
     538-2907 when MATERIAL is ready for shipment. Company shall select the
     carrier and arrange at Company's expense for the transportation of the
     MATERIAL.

10.  FREIGHT CLASSIFICATION
          MATERIAL purchased under this Agreement shall be shipped to Company
     subject to freight charges appropriate for goods classified as DCP-based
     Extenders and D/A Converters. Supplier shall indicate on the bill of lading
     that Company's contract rates apply.

11.  NON-EXCLUSIVE MARKET RIGHTS
          This Agreement neither grants to Supplier an exclusive right or
     privilege to sell to Company any or all products of the type described in
     the MATERIAL section which Company may require, nor requires the purchase
     of any MATERIAL or other products from Supplier by Company. Therefore,
     Company may contract with other manufacturers and suppliers for the
     procurement of comparable products. In addition, Company shall, at its sole
     discretion, decide the extent to which Company will market advertise,
     promote, support or otherwise assist in further offerings of the MATERIAL.

          Purchases by Company under this Agreement shall neither restrict the
     right of Company to cease purchasing nor require Company to continue any
     level of such purchases.


[***]  Confidential treatment has been requested for the bracketed portions.
       The confidential redacted portion has been filed separately with the
       Securities and Exchange Commission.
<PAGE>   4
                                                        Agreement No. WR71980064
                                                                  Sheet 4 of 31


12.  SPECIFICATIONS OR DRAWINGS
          Supplier's standard commercial Technical Specifications are included
     by reference and further described in APPENDIX B attached hereto and made a
     part of this Agreement.

     In accordance with the notification requirements outlined in Section
     "PRODUCT CHANGE NOTICES", Supplier shall provide Company with at least
     [***] business days prior written notice of any change proposed to be made
     by Supplier in the MATERIAL furnished pursuant to said Technical
     Specification under this Agreement.

          If Company, in its sole discretion, does not agree to the change
     proposed by Supplier, then in addition to all other rights and remedies at
     law or equity or otherwise, and without any cost to or liability or
     obligation of Company, Company shall have the right to terminate this
     Agreement and to terminate any or all purchase orders for MATERIAL affected
     by such change.

          Supplier shall continue to supply MATERIAL to Company pursuant to the
     Technical Specification for the term of the Agreement. If Supplier is
     unable to continue to thus supply or discontinues manufacture of MATERIAL,
     Company shall be entitled to [***] advance notice.

13.  ASSIGNMENT
          Supplier shall not assign any right or interest under this Agreement
     (excepting solely for moneys due or to become due) without the prior
     written consent of Company. Supplier shall be responsible to Company for
     all Work performed by Supplier's subcontractor(s) at any tier.

14.  BANKRUPTCY AND TERMINATION FOR FINANCIAL INSECURITY
          Either party may terminate this Agreement by notice in writing:

          (i)  if the other party makes an assignment for the benefit of
               creditors (other than solely an assignment of monies due); or:

          (ii) if the other party evidences an inability to pay debts as they
               become due, unless adequate assurance of such ability to pay is
               provided within thirty (30) days of such notice.

          If a proceeding is commenced under any provision of the United States
     Bankruptcy Code, voluntary or involuntary, by or against either party, and
     this Agreement has not been terminated, the non-debtor party may file a
     request with the bankruptcy court to have the court set a date within sixty
     (60) days after the commencement of the case, by which the debtor party
     will assume or reject this Agreement, and the debtor party shall cooperate
     and


[***] Confidential treatment has been requested for the bracketed portions. The
      confidential redacted portion has been filed separately with the
      Securities and Exchange Commission.
<PAGE>   5
                                                        Agreement No. WR71980064
                                                                  Sheet 5 of 31


     take whatever steps necessary to assume or reject the Agreement by such
     date.

15.  CFC PACKAGING
          Supplier warrants that all packaging materials furnished under this
     Agreement and all packaging associated with MATERIAL furnished under this
     Agreement were not manufactured using and do not contain
     chlorofluorocarbons. "Packaging" means all bags, wrapping, boxes, cartons
     and any other packing materials used for packaging. Supplier shall
     indemnify and hold Company harmless for any liability, fine or penalty
     incurred by Company to any third party or governmental agency arising out
     of Company's good faith reliance upon said warranty.

16.  CHOICE OF LAW
          This Agreement and all transactions under it shall be governed by the
     laws of the State of New Jersey excluding its choice of laws rules and
     excluding the Convention for the International Sale of Goods. Supplier
     agrees to submit to the jurisdiction of any court wherein an action is
     commenced against Company based on a claim for which Supplier has agreed to
     indemnify Company under this Agreement.

17.  COMPLIANCE WITH LAWS
          Supplier and all persons furnished by Supplier shall comply at their
     own expense with all applicable laws, ordinances, regulations and codes,
     including the identification and procurement of required permits,
     certificates, licenses, insurance, approvals and inspections in performance
     under this Agreement.


18.  CONTINUING AVAILABILITY
     Supplier shall offer for sale to Company, during the term of this Agreement
     and for at least one (1) year after the expiration of this Agreement,
     MATERIAL conforming to the Technical Specifications and other
     Specifications set forth in this Agreement. Supplier further shall offer
     for sale to Company, during the term of this Agreement and until five (5)
     years after the expiration of this Agreement, maintenance, replacement, and
     repair parts ("Parts") which are functionally equivalent and identical in
     form and fit for the MATERIAL covered by this Agreement. The price for the
     MATERIAL and Parts shall be the price set forth in Supplier's then current
     agreement with Company for said MATERIAL or Parts or, if no such agreement
     exists, at a price agreed upon by Company and Supplier. If the parties fail
     to agree on a price, the price shall be a reasonably competitive price for
     said MATERIAL or Parts at the time for delivery. The MATERIAL and Parts
     shall be warranted as set forth in the "WARRANTY" section of this
     Agreement. The term "Parts" is included in the term "MATERIAL."


<PAGE>   6
                                                        Agreement No. WR71980064
                                                                  Sheet 6 of 31


          In the event Supplier fails to supply such MATERIAL or Parts and
     Supplier is unable to obtain another source of supply for Company, then
     such failure or inability shall be considered noncompliance with this
     section and Supplier shall, without obligation of or charge to Company,
     provide Company with the technical information or any other rights required
     so that Company can provide technical support and maintenance to its
     customers.

          The technical information includes, by example; and not by way of
     limitation: (a) manufacturing drawings and specifications of raw materials
     and components comprising such MATERIAL or Parts, (b) manufacturing
     drawings and specifications covering special tooling and the operation
     thereof (c) a detailed list of all commercially available MATERIAL or Parts
     and components purchased by Supplier on the open market disclosing the
     MATERIAL or Part number, name and location of the Supplier and price lists
     for the purchase thereof, and (d) one complete copy of the executable code
     used in the preparation of any software licensed or otherwise acquired by
     Company from Supplier under this Agreement.

19.  DEFAULT
          If either party shall be in breach or default of any of the terms,
     conditions or covenants of this Agreement or of any purchase order, and if
     such breach or default shall continue for a period of ten (10) business
     days after the giving of written notice to other party thereof, then, in
     addition to all other rights and remedies which the non-defaulting party
     may have at law or equity or otherwise, the non-defaulting party shall have
     the right to cancel this Agreement and/or any purchase orders placed
     without any charge to or obligation or liability of non-defaulting party.

20.  ELECTRONIC DATA INTERCHANGE
          Supplier agrees, if requested by Company, to implement Electronic Data
     Interchange (EDI) ordering and payment arrangements as an electronic means
     of trading business document with Company. The electronic business
     documents include purchase orders, acknowledgments, purchase order changes,
     ship notices, invoices, remittance advice, electronic funds transfer (EFT)
     or such purchasing communications as may be requested by Company for
     transaction under this Agreement. Supplier shall at its sole expense,
     obtain, make fully operational and maintain all equipment, software and
     other materials set forth in Company's EDI Planning Guide. Supplier shall
     also execute an Electronic Purchasing Agreement with Company at the time of
     execution of this Agreement.

21.  EPIDEMIC CONDITION
          If during the term of this Agreement and for one (1) year after the
     last shipment date of MATERIAL under this Agreement Company notifies
     Supplier that MATERIAL shows evidence of an "Epidemic Condition,"

<PAGE>   7

                                                        Agreement No. WR71980064
                                                                  Sheet 7 of 31

     Supplier shall prepare and propose a Corrective Action Plan ("CAP") with
     respect to such MATERIAL within five (5) working days of such notification,
     addressing implementation and procedure milestones for remedying such
     Epidemic Condition(s). An extension of this time-frame is permissible upon
     mutual written agreement of the parties.

          Upon notification of the Epidemic Condition to Supplier, Company shall
     have the right to postpone all or part of the shipments of unshipped
     MATERIAL, by giving written notice of such postponement to Supplier,
     pending correction of the Epidemic Condition. Such postponement shall
     temporarily relieve Supplier of its shipment liability and Company of its
     shipment acceptance liability. Should Supplier not agree to the existence
     of an Epidemic Condition or should Company not agree to the CAP, then
     Company shall have the right to suspend all or part of its unshipped orders
     without liability to Company until such time as a mutually acceptable
     solution is reached.

          An Epidemic Condition will be considered to exist when one or more of
     the following conditions occur:

          (1) Failure reports or statistical samplings show that MATERIAL
     shipped contain a potential safety hazard (such as personal injury or
     death, fire, explosion, toxic emissions, etc.), or exhibit a highly
     objectionable symptom (such as emissions of smoke, loud noises, deformation
     of housing) or other disconcerting symptoms of this type.

          (2) Reliability plots of relevant data indicate that the MATERIAL has
     actual Mean Time Between Failures (MTBF) of less than 80% of the MTBF
     stipulated in the Technical Specification. The MTBF parameter of MATERIAL
     is defined as the total operating or power-on time of any population under
     observation ("T"), in hours, divided by the total number of critical
     failures ("n") that have occurred during the observed period. A critical
     failure is defined as a failure to operate per the requirements of the
     Technical Specification. The total operating time of a population is the
     summation of operating time of individual units in that population. MTBF is
     expressed as MTBF = T/n. An Epidemic Condition shall exist when data
     derived from populations being tracked confirms the condition with 80%
     confidence. (3) MATERIAL Dead on Arrival (DOA) failures exceed the Epidemic
     DOA failure rate which is defined as 1.2 x DOA specified in the section of
     this Agreement entitled PRODUCT CONFORMANCE REVIEW.

          Only major functional and visual/mechanical/appearance defects are
     considered for determining Epidemic Condition. MATERIAL could be either
     sampled or, a Company's option, 100% audited at Company warehouses,


<PAGE>   8


                                                        Agreement No. WR71980064
                                                                  Sheet 8 of 31


     factories or Company's customers' locations. If MATERIAL is sampled, the
     data must have 80% or better statistical confidence.

          For the purpose of this Agreement, functional DOA shall be defined as
     any MATERIAL that during the test, installation or upon its first use fails
     to operate as expected or specified. Visual/mechanical/appearance DOA is
     defined as any MATERIAL containing one or more major defects that would
     make the MATERIAL unfit for use or installation.

          An Epidemic Condition shall not include failures due to customer
     misapplication, utilization of parts not approved by Supplier, or chain
     failures induced by internally or externally integrated subassemblies.

          In the event that Supplier develops a remedy for the defect(s) that
     caused the Epidemic Condition and Company agrees in writing that the remedy
     is acceptable Supplier shall:

     (a) Incorporate the remedy in the affected MATERIAL in accordance with
     Company's instructions.

     (b) Ship all subsequent MATERIAL incorporating the required modification
     correcting the defect(s) at no additional charge to Company; and

     (c) Repair and/or replace MATERIAL that caused the Epidemic Condition. In
     the event that Company incurs costs due to such repair and/or replacement,
     including but not limited to labor and shipping costs, Supplier shall
     reimburse Company for such costs. Supplier shall bear risk of in transit
     loss and damage for such repaired and/or replaced MATERIAL.

          Supplier and Company shall mutually agree in writing as to the
     remedy's implementation schedule. Supplier shall use its best efforts to
     implement the remedy in accordance with the agreed-upon schedule.

          If Supplier is unable to develop a mutually agreeable remedy, or does
     not adequately take into account the business interests of Company, as
     reasonably agreed by the parties, Company may (1) develop and implement
     such remedy and, in such case, implementation costs and risk of in-transit
     loss and damage shall be allocated between the parties as set forth in this
     section, and/or (2) cancel postponed orders without liability and return
     all MATERIAL affected by such Epidemic Condition for full refund, payable
     by Supplier within thirty (30) business days after receipt of returned
     MATERIAL (with risk of loss or in-transit damage borne by Supplier) and/or
     (3) terminate this Agreement without further liability.



<PAGE>   9
                                                        Agreement No. WR71980064
                                                                  Sheet 9 of 31

22.  EXPORT CONTROL
          Supplier will not use, distribute, transfer or transmit any products,
     software or technical information (even if incorporated into other
     products) provided under this Agreement except in compliance with U.S.
     export laws and regulations (the "Export Laws"). Supplier will not,
     directly or indirectly, export or re-export the following items to any
     country which is in the then current list of prohibited countries specified
     in the applicable Export Laws: (a) software or technical data disclosed or
     provided to Supplier by Company or Company's subsidiaries or affiliates; or
     (b) the direct product of such software or technical data. Supplier agrees
     to promptly inform Company in writing of any written authorization issued
     by the U.S. Department of Commerce office of export licensing to export or
     re-export any such items referenced in (a) or (b). The obligations stated
     above in this clause will survive the expiration, cancellation or
     termination of this Agreement or any other related agreement.

23.  FORCE MAJEURE
          Neither party shall be held responsible for any delay or failure in
     performance of any part of this Agreement to the extent such delay or
     failure is caused by fire, flood, strike, civil, governmental, or military
     authority, act of God, or other similar causes beyond its control and
     without the fault or negligence of the delayed or non performing party or
     its subcontractors. Supplier's liability for loss or damage to Company's
     MATERIAL in Supplier's possession or control shall not be modified by this
     section. When a party's delay or nonperformance continues for a period of
     at least fifteen (15) days, the other party may terminate, at no charge,
     this Agreement or an order under the Agreement.

24.  GOVERNMENT CONTRACT PROVISIONS
          The following provisions regarding equal opportunity, and all
     applicable laws, rules, regulations and executive orders specifically
     related thereto, including applicable provisions and sections from the
     Federal Acquisition Regulation and all supplements thereto are incorporated
     in this Agreement as they apply to work performed under specific U.S.
     Government contracts: 41 CFR 60-1.4, Equal Opportunity; 41 CFR 60-1.7,
     Reports and Other Required Information; 41 CFR 60-1.8, Segregated
     Facilities; 41 CFR 60-250.4, Affirmative Action For Disabled Veterans and
     Veterans of the Vietnam Era (if in excess of $10,000); and 41 CFR 60-741.4,
     Affirmative Action for Disabled Workers (if in excess of $2,500), wherein
     the terms "contractor" and "subcontractor" shall mean "Supplier". In
     addition, orders placed under this Agreement containing a notation that the
     material or services are intended for use under Government contracts shall
     be subject to such other Government provisions printed, typed or written
     thereon, or on the reverse side thereof, or in attachments thereto.

<PAGE>   10

                                                        Agreement No. WR71980064
                                                                  Sheet 10 of 31


25.  HEAVY METALS IN PACKAGING
          Supplier warrants to Company that no lead, cadmium, mercury or
     hexavalent chromium have been intentionally added to any packaging or
     packaging component (as defined under applicable laws) to be provided to
     Company under this Agreement and that packaging materials were not
     manufactured using and do not contain chlorofluorocarbons. Supplier further
     warrants to Company that the sum of the concentration levels of lead,
     cadmium, mercury and hexavalent chromium in the package or packaging
     component provided to Company under this Agreement does not exceed 100
     parts per million. Upon request, Supplier shall provide to Company
     Certificates of Compliance certifying that the packaging and/or packaging
     components provided under this Agreement are in compliance with the
     requirements set forth above in this section.

26.  IDENTIFICATION
          Supplier shall not, without Company's prior written consent, engage in
     publicity related to this Agreement, or make public use of any
     Identification in any circumstances related to this Agreement.
     "Identification" means any semblance of any trade name, trademark, service
     mark, insignia, symbol, logo, or any other designation, or drawing of
     Company or its affiliates. Supplier shall remove or obliterate any
     Identification prior to any use or disposition of any MATERIAL rejected or
     not purchased by Company.

27.  IMPLEADER
          Supplier shall not implead or bring an action against Company based on
     any claim by any person for personal injury or death to an employee of
     Company for which Company has previously paid or is obligated to pay
     worker's compensation benefits to such employee or claimant and for which
     such employee or claimant could not otherwise bring legal action against
     Company.

28.  INDEMNITY
          At Company's request, Supplier agrees to indemnify, defend and hold
     harmless Company, its affiliates, customers, employees, successors and
     assigns (all referred to as "Company") from and against any losses,
     damages, claims, fines, penalties and expenses (including reasonable
     attorney's fees) that arise out of or result from: (i) injuries or death to
     persons or damage to property, including theft, in any way arising out of
     or caused or alleged to have been caused by the Work or services performed
     by, or material provided by Supplier or persons furnished by Supplier; (ii)
     assertions under Workers' Compensation or similar acts made by persons
     furnished by Supplier; or (iii) any failure of Supplier to perform its
     obligations under this Agreement.

<PAGE>   11
                                                        Agreement No. WR71980064
                                                                  Sheet 11 of 31



29.  INFRINGEMENT
          Supplier shall indemnify and save harmless Company, its affiliates and
     their customers, officers, directors, employees (all referred to in this
     section as "Company") from and against any losses, damages, liabilities,
     fines, penalties, and expenses (including reasonable attorneys' fees) that
     arise out of or result from any and all claims (i) of infringement of any
     patent, copyright, trademark or trade secret right, or other intellectual
     property right, private right, or any other proprietary or personal
     interest, and (ii) related by circumstances to the existence of this
     Agreement or performance under or in contemplation of it (an Infringement
     Claim). If the Infringement Claim arises solely from Supplier's adherence
     to Company's written instructions regarding services or tangible or
     intangible goods provided by Supplier (Items) and if the Items are not (i)
     commercial items available on the open market or the same as such items, or
     (ii) items of Supplier's designated origin, design or selection, Company
     shall indemnify Supplier. Company or Supplier (at Company's request) shall
     defend or settle, at its own expense any demand, action or suit on any
     Infringement Claim for which it is indemnitor under the preceding
     provisions and each shall timely notify the other of any assertion against
     it or any Infringement Claim and shall cooperate in good faith with the
     other to facilitate the defense of any such Claim.

30.  INSIGNIA
          Upon Company's written request, "Insignia", including certain
     trademarks, trade names, insignia, symbols, decorative designs or packaging
     designs of Company, or evidences of Company's inspection will be properly
     affixed by Supplier to the MATERIAL furnished or its packaging. Such
     Insignia will not be affixed, used or otherwise displayed on the MATERIAL
     furnished or in connection therewith without written approval by Company.
     The manner in which such Insignia will be affixed must be approved in
     writing by Company in accordance with standards established by Company.
     Company shall retain all right, title and interest in any and all packaging
     designs, finished artwork and separations furnished to Supplier. This
     section does not reduce or modify Supplier's obligations under the
     "IDENTIFICATION" and "USE OF INFORMATION" section.

31.  INSURANCE
          Supplier shall maintain and cause Supplier's subcontractors to
     maintain during the term of this Agreement: (i) Workers' Compensation
     insurance as prescribed by the law of the state or nation in which the Work
     is performed; (ii) employer's liability insurance with limits of at least
     $500,000 for each occurrence; (iii) automobile liability insurance if the
     use of motor vehicles is required, with limits of at least $1,000,000
     combined single limit for bodily injury and property damage for each
     occurrence; (iv) Commercial General Liability ("CGL") insurance, ISO 1988
     or later occurrence form of insurance including Blanket Contractual
     Liability and Broad Form Property

<PAGE>   12
                                                        Agreement No. WR71980064
                                                                  Sheet 12 of 31


     Damage, with limits of at least $1,000,000 combined single limit for bodily
     injury and property damage for each occurrence; and (v) if the furnishing
     to Company (by sale or otherwise) of products or material is involved, CGL
     insurance endorsed to include products liability and completed operations
     coverage in the amount of $2,000,000 per occurrence. All CGL and automobile
     liability insurance shall designate Company, its affiliates, and its
     directors, officers and employees (all referred to as "Company") as
     additional insured. All such insurance must be primary and non-contributory
     and required to respond and pay prior to any other insurance or
     self-insurance available. Any other coverage available to Company shall
     apply on an excess basis. Supplier agrees that Supplier, Supplier's
     insurer(s) and anyone claiming by, through, under or in Supplier's behalf
     shall have no claim, right of action or right of subrogation against
     Company and its customers based on any loss or liability insured against
     under the foregoing insurance. Supplier and Supplier's subcontractors shall
     furnish prior to the start of Work, certificates or adequate proof of the
     foregoing insurance, including if specifically requested by Company,
     endorsements and insurance policies. Company shall be notified in writing
     at least thirty (30) days prior to cancellation of or any change in the
     policy. Insurance companies providing coverage under this Agreement must be
     rated by A-M Best with at least an A- rating.

32.  INVOICING FOR GOODS
          Supplier shall: (i) render original invoice, or as otherwise specified
     in this Agreement, showing Agreement and order number, through routing and
     weight, (ii) render separate invoices for each shipment within twenty-four
     (24) hours after shipment, and (iii) mail invoices with copies of bills of
     lading and shipping notices to the address shown on this Agreement or
     order. If prepayment of transportation charges is authorized, Supplier
     shall include the transportation charges from the F.O.B. point to the
     destination as a separate item on the invoice stating the name of the
     carrier used.

33.  INVOICING FOR STOCKS
          If Company requests for reasons other than covered by Section "FORCE
     MAJEURE", that shipment be postponed beyond the date shown on a purchase
     order, Supplier may invoice Company as of the original scheduled delivery
     date for MATERIAL manufactured under this Agreement, if it has been
     inspected and approved by Company's designated quality organization
     (provided inspection has been specified in this Agreement or in an order
     issued under this Agreement).

34.  JURISDICTION
          Subject to the section "MEDIATION", Supplier agrees that any action or
     legal proceeding arising out of this Agreement shall be brought only in a
     court of competent jurisdiction in the United States of America and
     Supplier


<PAGE>   13

                                                        Agreement No. WR71980064
                                                                  Sheet 13 of 31


     expressly submits to, and accepts the jurisdiction of, any such court in
     connection with such action or proceeding and Supplier further consents to
     the enforcement of any judgment against it arising therefrom in any
     jurisdiction in which it has or shall have any assets.

35.  LICENSES
          No Licenses, express or implied, under any patents are granted by
     Company to Supplier under this Agreement or order.

36.  MARKING
          All MATERIAL furnished under this Agreement shall be marked for
     identification purposes in accordance with the specifications set forth in
     this Agreement and as follows:


          (a) with Supplier model/serial number; and

          (b) with month and year of manufacture.

          (c) with Company's Comcode

          In addition, Supplier shall add any other identification which might
     be requested by Company such as but not limited to indicia conforming to
     the Company's Serialization Plan (KS-23490) and is included by reference, a
     copy being in the possession of the Supplier. Charges, if any, for such
     additional identification marking shall be as agreed upon by Supplier and
     Company. This section does not reduce or modify Supplier's obligations
     under the "IDENTIFICATION" section.

37.  MEDIATION
          If a dispute relates to this Agreement, or its breach, and the parties
     have not been successful in resolving such dispute through negotiation, the
     parties shall attempt to resolve the dispute through mediation by
     submitting the dispute to a sole mediator selected by the parties or, at
     any time at the option of a party, to mediation by the American Arbitration
     Association ("AAA"). Each party shall bear its own expenses and an equal
     share of the expenses of the mediator and the fees of the AAA. All defenses
     based on passage of time shall be suspended pending the termination of the
     mediation. Nothing in this section shall be construed to preclude any party
     from seeking injunctive relief in order to protect its rights pending
     mediation.

38.  MONTHLY ORDER AND SHIPMENT REPORTS
          Supplier shall render monthly order and shipment reports on or before
     the fifth (5th) working day of the succeeding month containing the
     information agreed to by Company and Supplier.

<PAGE>   14
                                                        Agreement No. WR71980064
                                                                  Sheet 14 of 31

39.  NEW AND CHANGED METHODS, PROCESSES AND EQUIPMENT
          Supplier shall use reasonable efforts to keep abreast of major
     developments in Supplier's industry and to promptly advise Company of any
     developments that might affect the production of any MATERIAL under this
     Agreement.


40.  NON WAIVER
          The failure of either party at any time to enforce any right or remedy
     available to it under this Agreement or otherwise with respect to any
     breach or failure by the other party shall not be construed to be a waiver
     of such right or remedy with respect to any other breach or failure by the
     other party.

41.  NOTICES
          Any notice given or demand which under the terms of this Agreement or
     under any statute must or may be given or made by Supplier or Company shall
     be in writing and shall be given or made by confirmed facsimile, or similar
     communication or by certified or registered mail addressed to the
     respective parties as follows

     To Company:       Lucent Technologies Inc.
                       Global Procurement Organization
                       211 Mt. Airy Road
                       Room 3W222
                       Basking Ridge, NJ  07920

                       Attn.:  Sourcing Manager

                       -OR-

     To Supplier:      MCK Communications, Inc.
                       313 Washington Street
                       Newton, MA 02158

                       Attn.: Chief Executive Officer

          Such notice or demand shall be deemed to have been given or made when
     sent by facsimile, or other communication or when deposited, postage
     prepaid in the U.S. mail. The above addresses may be changed at any time by
     giving prior written notice as above provided.

          The above addresses may be changed at any time by giving prior written
     notice as above provided.

<PAGE>   15

                                                        Agreement No. WR71980064
                                                                  Sheet 15 of 31

42.  OPERATING SYSTEM SOFTWARE
          The term MATERIAL includes any software (operating program in machine
     readable form and related documentation) and storage media therefor
     normally furnished with or embedded in the MATERIAL. Title to the software,
     including copyright, shall remain in Supplier. The party having title to
     the MATERIAL shall have title to the software storage media. For the life
     of the MATERIAL listed in this Agreement, Supplier grants to Company and
     any subsequent purchaser, lessee or other end user (referred to
     collectively in this section as "end user") a non-exclusive license to use
     said software on the MATERIAL on which it was delivered. Company and any
     subsequent end user may copy the software for use on such MATERIAL with
     which it was originally delivered and for archival purposes, but shall not
     knowingly reproduce either the original software for distribution to
     others. Company and any subsequent end user may add to, delete from or
     modify the software in any manner, but no changes, however extensive, shall
     alter Supplier's title to such original software. Title to any such
     modification or addition to the software shall remain in the entity which
     creates the modification or addition.

43.  OZONE DEPLETING CHEMICALS
          Supplier hereby warrants that it is aware of international agreements
     and pending legislation in several nations, including the United States,
     which would limit, ban and/or tax importation of any product containing, or
     produced using ozone depleting chemicals ("ODCs"), including
     chlorofluorocarbons, halons and certain chlorinated solvents. Supplier
     hereby warrants that the MATERIAL furnished to Company will conform to all
     applicable requirements established pursuant to such agreements,
     legislation and regulations, and the MATERIAL furnished to Company will be
     able to be imported and used lawfully (and without additional taxes
     associated with ODCs not reported to Company by Supplier as set forth in
     this section) under all such agreements, legislation and requirements.
     Supplier also warrants that it is currently reducing, or if Supplier is not
     the manufacturer of the MATERIAL, is currently causing the manufacturing
     vendor to reduce and will, in an expeditious manner, eliminate, or, as
     applicable, have its manufacturing vendor eliminate the use of ODCs in the
     manufacture of the MATERIAL.

          If the MATERIAL furnished by Supplier under this Agreement is
     manufactured outside the United States, Supplier shall, upon execution of
     this Agreement, and at any time that new products are added to this
     Agreement or changes are made to the MATERIAL furnished under this
     Agreement, complete, sign and return to Company the attached ODC Content
     Certification. The ODC Content Certification must be signed by Supplier's
     facility manager, corporate officer or his delegate.

          The term "ODC content" on the ODC Content Certification means the
     total pounds of ODC used directly in the manufacture of each unit of

<PAGE>   16
                                                        Agreement No. WR71980064
                                                                  Sheet 16 of 31


     MATERIAL. This includes all ODCs used in the manufacturing and assembly
     operations for the MATERIAL plus all ODCs used by Supplier's vendors and
     any other vendors in producing components or other products incorporated
     into the MATERIAL sold to Company.

          Supplier is responsible to obtain information on the ODC content of
     all components and other products acquired to manufacture the MATERIAL and
     to incorporate such information into the total ODC content reported to
     Company. Provided however, that Supplier should not include in the ODC
     content those components or other products which are manufactured in the
     United States. Supplier hereby warrants to Company that all information
     furnished by Supplier on the ODC Content Certification is complete and
     accurate and that Company may rely on such information for any purpose,
     including but not limited to providing reports to government agencies or
     otherwise complying with applicable laws. Supplier shall defend, indemnify
     and hold Company harmless of and from any claims, demands, suits,
     judgments, liabilities, fines, penalties, costs and expenses (including
     additional ODC taxes as provided for in paragraph one of this section and
     reasonable attorney's fees) which Company may incur under any applicable
     federal, state, or local laws or international agreements, and any and all
     amendments thereto by reason of Company's use of reliance on the
     information furnished to Company by Supplier on the ODC Content
     Certification or by reason of Supplier's breach of this section. Supplier
     shall cooperate with Company in responding to any inquiry concerning the
     use of ODCs to manufacture the MATERIAL or components thereof and to
     execute without additional charge any documents reasonably required to
     certify the absence or quantity of ODCs used to manufacture the MATERIAL or
     components thereof.

44.  OZONE DEPLETING SUBSTANCES LABELING
          Supplier warrants and certifies that all MATERIAL and other products,
     including packaging and packaging components, provided to Company under
     this Agreement have been accurately labeled, in accordance with the
     requirements of 40 CFR, Part 82 entitled "Protection of Stratospheric
     Ozone, Subpart E- The Labeling of Products Using Ozone Depleting
     Substances."

45.  PACKING, LABELING AND SERIALIZATION
          MATERIAL purchased, repaired, replaced or refurbished under this
     Agreement shall be packed, labeled and serialized by Supplier at no
     additional charge in accordance with specifications OEMPS No. 101 "Packing
     and Shipping Requirements," X-20587 "Specification Requirements for Package
     Content Identification Label," and KS-23490 "Product Bar Code, Serial and
     Comcode Label," is included by reference, a copy being in the possession of
     the Supplier and as changed from time to time with Supplier's written
     approval.

<PAGE>   17
                                                        Agreement No. WR71980064
                                                                  Sheet 17 of 31

46.  PRODUCT CHANGES
          Supplier shall notify Company in advance, in writing of any change
     proposed to be made in accordance with this Agreement, or in the
     Specification and documentation covered by this Agreement that would impact
     upon: (i) reliability, (ii) requirements of the Specification, or (iii)
     form, fit or function (as defined below).

          In order for Company to review these proposed changes, at least thirty
     (30) business days advance notice will be required except for those cases
     where an extremely unsatisfactory condition requires immediate action. In
     that instance, verbal notification to Company shall be used, followed by
     Supplier's immediate written confirmation.

          "Form" shall mean changes in appearance visible to the user (customer,
     repair personnel, developer) of the MATERIAL.

          "Fit" shall mean changes in parts to components that are not
     physically interchangeable.

          "Function" shall mean changes that affect operational characteristics
     of the MATERIAL or require the operator to change the method of operation.

          Supplier shall submit a proposal to Company, specifically documenting
     all cost factors, implementation schedules, and repair changes.

          The change notice shall be sent to the following address:

                     Lucent Technologies Inc.
                     211 Mt. Airy Road
                     Room 3W222
                     Basking Ridge, NJ 07920

                     Attn.: Sourcing Manager:

          The format of Supplier's notification document shall be the
     responsibility of Supplier but said notification document shall contain at
     least the following information.

          1. Supplier's name.

          2. Agreement number.

          3. MATERIAL description.

          4. Change number.

          5. MATERIAL affected.

          6. Reason for change.
<PAGE>   18

                                                        Agreement No. WR71980064
                                                                  Sheet 18 of 31


          7. Description of change (including the impact upon: (i) reliability,
            (ii) requirements of the Specification and (iii) form, fit or
            function.)

          8. [***]

          9. Marking method of identifying changed units.

          10. Documentation

               a. Marked up documents shall be provided until the document or
                  drawing is re-issued.

               b. Listing of documents and drawings to be changed.

               c. Field repair or modification kit documentation (if
                  applicable).

          11. Unit in process, in stock and installed affected by change.

          12. Date changes are proposed to be implemented.

          13. All necessary and relevant temporary changes affected by this
              notice.

          14. All necessary and relevant attachments.

          15. Additional comments.

          If, as mutually agreed by Company and Supplier, sufficient changes
     have been made to warrant a MATERIAL re-qualification, such
     re-qualification will be performed at no cost to Company unless otherwise
     agreed.

          MATERIAL shall be in accordance with the latest information stated or
     referenced in the Specification.

          The quality of MATERIAL used and the method of manufacturing, handling
     and shipping, shall be such that the finished MATERIAL meets the properties
     and requirements shown in the Specification and in the other sections of
     this Agreement.

          If Company, in its sole discretion, does not agree to the change(s)
     proposed by Supplier, then in addition to all other rights and remedies at
     law or equity or otherwise, and without any cost to or liability or
     obligation of Company, Company shall have the right to terminate this
     Agreement and to terminate any or all orders for MATERIAL affected by such
     change.

47.  PRODUCT CONFORMANCE REVIEWS
          Supplier shall, utilizing documented procedures specified herein, make
     such tests and inspections as are necessary to insure that MATERIAL meets
     all technical requirements of the MATERIAL specification. Supplier shall
     provide, without charge, any production testing facilities and personnel
     required to inspect the MATERIAL under Quality Program Specification (QPS)
     Nos. 40.002 and 40.030, included by reference, a copy being in possession
     of the Supplier as changed from time to time with Supplier's written
     approval. Company reserves the right to inspect MATERIAL prior to shipment
     from Supplier or Supplier's subcontractor(s). Such inspection shall

[***] Confidential treatment has been requested for the bracketed portions. The
      confidential redacted portion has been filed separately with the
      Securities and Exchange Commission.
<PAGE>   19

                                                        Agreement No. WR71980064
                                                                  Sheet 19 of 31

     be conducted by Company's Engineering and Environmental Technologies (EE&T)
     organization utilizing a 0.65% Acceptability Level (AQL) sampling plan as
     described in QPS 40.030. If MATERIAL fails inspection, Supplier agrees to
     pay for all re-inspection costs. Inspection requirements may be waived only
     by written notification from Company's Engineering and Environmental
     Technologies (EE&T) organization. In the event that any or all work under
     this Agreement is subcontracted to another Supplier, Company reserves the
     right to conduct the aforementioned inspections at the subcontractors
     facilities.

48.  PRODUCT DOCUMENTATION

          Supplier shall furnish, at no charge, product documentation, and any
     succeeding changes thereto, as described in the Technical Specification.
     Company may use, reproduce, reformat, modify and distribute such product
     documentation.

          Company shall reproduce Supplier's copyright notice contained in any
     documentation reproduced without change by Company. For documentation which
     is reformatted or modified by Company, Company shall have the right to
     place only Company's own copyright notice on the reformatted or modified
     documentation. It is the intent of the parties that Company's copyright
     notice shall be interpreted to protect the underlying copyright rights of
     Supplier to the documentation to the extent such underlying rights are
     owned by Supplier.

49.  PURCHASE ORDERS
          Purchase orders issued under this Agreement shall be sent to the
     following address:

                      MCK Communications, Inc.
                      313 Washington Street
                      Newton, MA 02158

                      Attn.:   Vice President Sales

          Purchase orders shall specify: (i) description of MATERIAL, inclusive
     of any numerical/alphabetical identification referenced in the price list
     in this Agreement, (ii) delivery date, (iii) applicable price, (iv)
     location to which the MATERIAL is to be shipped and (v) location to which
     invoices shall be sent for payment.

50.  REGISTRATION AND RADIATION STANDARDS
          When MATERIAL furnished under this Agreement is subject to Part 68,
     Part 15 or any other part of the Federal Communication Commission's Rules
     and Regulations, as may be amended from time to time (hereinafter


<PAGE>   20
                                                        Agreement No. WR71980064
                                                                  Sheet 20 of 31


     "FCC Rules"), Supplier warrants that such MATERIAL complies with the
     registration, certification, type-acceptance and/or verification standards
     of the FCC Rules including, but not limited to, all labeling, customer
     instruction requirements, and the suppression of radiation to specified
     levels. Supplier shall also establish periodic on-going compliance
     retesting and follow a Quality Control program, submitted by Company, to
     assure that MATERIAL shipped complies with the applicable FCC Rules.
     Supplier shall indemnify and save Company harmless from any liability,
     fines, penalties, claims or demands (including the costs, expenses and
     reasonable attorney's fees on account thereof) that may be made because of
     Supplier's noncompliance with the applicable FCC Rules. Supplier shall
     defend Company, at Company's request, against such liability, claim or
     demand.

          In addition, should MATERIAL which is subject to Part 15 of the FCC
     Rules, during use generate harmful interference to radio communications,
     Supplier shall provide the Company information relating to methods of
     suppressing such interference and pay the cost of suppressing such
     interference or, at the option of Company, accept the return of the
     MATERIAL and refund to Company the price paid for the MATERIAL less a
     reasonable amount for depreciation, if applicable.

          To the extent that MATERIAL furnished under this Agreement is also
     subject to FCC Rules governing the use of the MATERIAL as a component in a
     system, Company shall be responsible for compliance with the applicable FCC
     Rules governing the system. Supplier shall fully cooperate with Company, by
     providing technical support and information, and, upon written request from
     Company, shall modify MATERIAL to enable Company to ensure ongoing
     compliance with the FCC Rules. Company shall pay any increase in Supplier's
     costs and/or expenses resulting from Company's request to modify MATERIAL
     to enable Company to comply with the FCC Rules.

          Nothing in this section shall be deemed to diminish or otherwise limit
     Supplier's obligations under the "WARRANTY" section or any other section of
     this Agreement.

51.  REJECTIONS
          If Company rejects any or all of the MATERIAL, Company may, in
     addition to all its other rights and remedies at law or equity, exercise
     one or more of the following remedies: (1) return rejected MATERIAL for
     full credit at the price charged plus transportation charges from
     Supplier's plant, and return; or (2) accept a conforming part of any
     shipment; or (3) have rejected MATERIAL replaced by Supplier at the
     purchase price stipulated in this Agreement.


<PAGE>   21
                                                        Agreement No. WR71980064
                                                                  Sheet 21 of 31


52.  RELEASES VOID
          Neither party shall require (i) waivers or releases of any personal
     rights or (ii) execution of documents which conflict with the terms of this
     Agreement, from employees, representatives or customers of the other in
     connection with visits to its premises and both parties agree that no such
     releases, waivers or documents shall be pleaded by them or third persons in
     any action or proceeding.

53.  REPAIRS NOT COVERED UNDER WARRANTY
          In addition to repairs provided for in the "WARRANTY" section Supplier
     shall provide repair service on all MATERIAL ordered under this Agreement
     during the term of this Agreement and until five (5) years after the
     expiration of this Agreement. MATERIAL to be repaired under this section
     will be returned to a location designated by Supplier, and unless otherwise
     agreed upon by Supplier and Company, Supplier shall ship the repaired
     MATERIAL which meets the Specifications set forth in the "SPECIFICATIONS OR
     DRAWINGS" section and all other Specifications within ten (10) business
     days of receipt of the defective or non-conforming MATERIAL. With the
     concurrence and scheduling of Company, repair may be made by Supplier on
     site.

          If MATERIAL is returned to Supplier for repair as provided for in this
     section and is determined to be beyond repair, Supplier shall so notify
     Company. If requested by Company, Supplier will sell to Company a
     replacement at the price set forth in Supplier's then current agreement
     with Company for said MATERIAL or, if no such agreement exists, at a price
     agreed upon by Supplier and Company. If the parties fail to agree on a
     price, the price shall be a reasonably competitive price for such MATERIAL
     at the time for delivery. Further, if requested by Company, Supplier shall
     take the necessary steps to dispose of the unrepairable MATERIAL and pay to
     Company the salvage value, if any. Replacement and repaired MATERIAL shall
     be warranted as set forth in the "WARRANTY" section.

          This Agreement does not grant Supplier an exclusive privilege to
     repair any or all of the MATERIAL purchased under this Agreement for which
     Company may require repair; and Company may perform the repairs or contract
     with others for these services. In addition, Supplier authorizes Company
     and any qualified repairer with whom Company may contract to perform
     repairs on all MATERIAL purchased under this Agreement.

          All transportation costs of and in transit risk of loss and damage to
     MATERIAL returned to Supplier for repair under this section will be borne
     by Company and all transportation costs of and in transit risk of loss and
     damage to such repaired or replacement MATERIAL returned to Company will be
     borne by Company.

<PAGE>   22
                                                        Agreement No. WR71980064
                                                                  Sheet 22 of 31


          Price schedules for repairs under this section are listed in APPENDIX
     A.

54.  REPAIR PROCEDURES
          Company shall furnish the following information with MATERIAL returned
     to Supplier for repair: (a) Company's name and complete address; (b)
     name(s) and telephone numbers(s) of Company's employee(s) to contact in
     case of questions about the MATERIAL to be repaired; (c) ship-to address
     for return of repaired MATERIAL if different than (a); (d) a complete list
     of MATERIAL returned; (e) the nature of the defect or failure if known; and
     (f) whether or not returned MATERIAL is in warranty. Supplier shall, within
     ten (10) days of the execution of this Agreement, provide a written notice
     to Company specifying (i) the name(s) and telephone number(s) of the
     individual(s) to be contacted concerning any questions that may arise
     concerning repair, and (ii) if required, any special packing of MATERIAL
     which might be necessary to provide adequate in-transit protection from
     transportation damage.

          MATERIAL repaired by Supplier shall have the repair completion date
     stenciled or otherwise identified in a permanent manner at a readily
     visible location on the MATERIAL and the repaired MATERIAL shall be
     returned with a tag or other papers describing the repairs which have been
     made.

          All invoices originated by Supplier for repair services must be
     clearly identified as such, and must contain: (i) a reference to Company's
     purchase order for these repair services, (ii) a detailed description of
     repairs made by Supplier and the need therefor, and (iii) an itemized
     listing of parts and labor charges, if any. Replaced parts will, upon
     request, be available for inspection by or returned to Company. Further,
     the provisions of the "INVOICING" and "SHIPPING" sections, other than
     provisions relating to transportation charges with respect to MATERIAL
     repaired under warranty, shall apply to Supplier's return to Company of
     repaired MATERIAL.

55.  RIGHT OF ENTRY
          Each party shall have the right to enter the premises of the other
     party during standard business hours with respect to the performance of
     this Agreement, including an inspection or a Quality Review, subject to all
     plant rules and regulations, clearances, security regulations and
     procedures as applicable. Each party shall provide safe and proper
     facilities for such purpose. No charge shall be made for such visits. It is
     agreed that prior notification will be given when access is required.


<PAGE>   23

                                                        Agreement No. WR71980064
                                                                  Sheet 23 of 31

56.  SAFETY CERTIFICATION
          All MATERIAL purchased under this Agreement shall be designed to be in
     compliance with the applicable Underwriters Laboratories (UL) and Canadian
     Standards Association (CSA) rules and regulations. It is agreed that
     Supplier shall be responsible for filing the required documents to obtain
     compliance with said Underwriters Laboratories Standards and Canadian
     Standards. Supplier shall be responsible for making the MATERIAL available
     for testing.

57.  SECTION HEADINGS
          The headings of the sections in this Agreement are inserted for
     convenience only and are not intended to affect the meaning or
     interpretation of this Agreement.

58.  SERVICES
          Visits by Supplier's representatives or its suppliers' representatives
     for inspection, adjustment or other similar purposes in connection with
     MATERIAL purchased under this Agreement shall for all purposes be deemed
     "Work under this Agreement" and shall be at no charge to Company unless
     otherwise agreed in writing between the parties.

59.  SEVERABILITY
          If any of the provisions of this Agreement shall be invalid or
     unenforceable, such invalidity or unenforceability shall not invalidate or
     render unenforceable the entire Agreement, but rather the entire Agreement
     shall be construed as if not containing the particular invalid or
     unenforceable provision or provisions, and the rights and obligations of
     Supplier and Company shall be construed and enforced accordingly.

60.  SHIPPING
          Supplier shall: (i) ship the MATERIAL covered by this Agreement or
     order complete unless instructed otherwise, (ii) ship to the destination
     designated in the Agreement or order, (iii) ship according to routing
     instructions given by Company, (iv) place the Agreement and order number on
     all subordinate documents, (v) enclose a packing memorandum with each
     shipment and, when more than one package is shipped, identify the package
     containing the memorandum; and (vi) mark the order number on all packages
     and shipping papers. Adequate protective packing shall be furnished at no
     additional charge. Shipping and routing instructions may be furnished or
     altered by Company without a writing. If Supplier does not comply with the
     terms of the FOB section of the Agreement or order or with Company's
     shipping or routing instructions, Supplier authorizes Company to deduct
     from any invoice of Supplier (or to charge back to Supplier), any increased
     cost incurred by Company as a result of Supplier's noncompliance.


<PAGE>   24
                                                        Agreement No. WR71980064
                                                                  Sheet 24 of 31


61.  SHIPPING INTERVAL
          The delivery schedule applicable to each purchase order will be agreed
     upon by Supplier and Company and set forth in the purchase order. (Note:
     Supplier has indicated that MATERIAL can usually be shipped an average of
     twenty (20) business days after receipt of Company's purchase order;
     however, in no event shall the delivery interval exceed thirty (35)
     business days after receipt of purchase order.)

          If Supplier exceeds the above maximum interval then in addition to all
     other rights and remedies at law or equity or otherwise, and without any
     liability or obligation of Company, Company shall have the right to: (a)
     cancel such purchase order, or (b) extend such delivery date to a later
     date, subject, however, to the right to cancel as in (a) preceding if
     delivery is not made or performance is not completed on or before such
     extended delivery date. If Company elects to extend such delivery date,
     Supplier shall absorb the difference between the charges to ship normal
     transportation and the charges to ship premium overnight.

          If a purchase order is canceled by Company pursuant to the above,
     Company shall have the right to retain or return any or all MATERIAL
     received by or paid for by Company under such purchase order. Within
     fifteen (15) business days of Supplier's receipt of returned MATERIAL,
     Supplier shall reimburse Company for the costs of shipping the MATERIAL
     returned to Supplier and for any amounts, including shipping costs,
     previously paid by Company for the MATERIAL. Company shall pay for any
     MATERIAL if retains at the prices set forth in APPENDIX A, less applicable
     discounts which shall be applied on the basis of the quantity specified in
     the purchase order.

          If, during the course of this Agreement, Supplier determines that
     Supplier will no longer be able to ship within the above interval, Supplier
     shall immediately notify Company's buyer to that effect. Supplier shall
     also notify Company's buyer, as soon as it becomes apparent, if Supplier is
     unable to meet the delivery date for an order. However, nothing contained
     in this paragraph shall waive Company's rights as set forth above in this
     section.

62.  SHIPPING LOCATION
          The material shall be shipped FOB Supplier's location 313 Washington
     Street, Newton, MA 02158 or 130 Bowness Centre, Calgary, ALB T3B 5M5. The
     1990 INCOTERM manual shall govern interpretation of shipment terms under
     this Agreement.

63.  STORAGE OF PAID FOR STOCK
          Subject to the section "OPERATING SYSTEM SOFTWARE", Company has and
     shall have at all times all right, title and interest in all


<PAGE>   25

                                                        Agreement No. WR71980064
                                                                  Sheet 25 of 31


     MATERIAL invoiced to Company in accordance with the section "INVOICING FOR
     STOCKS". Such MATERIAL shall be referred to in this section as "Company
     Property." Supplier shall store such Company Property without cost to
     Company at Supplier's, 313 Washington Street, Newton, MA, facility and ship
     such Company Property as ordered by Company. In addition, Supplier shall:

         (i)   Be responsible for the safekeeping of the Company Property,
     assume all risks of loss or damage to the same and be liable for the full
     actual value of such Company Property. In case of removal of all or any
     part of the Company Property from one building to another, Supplier's
     responsibility for loss or damage shall continue and Supplier shall give
     Company at least ten (10) days advance notice in writing of the removal,
     except when the removal is required to comply with Company's shipping
     orders or to protect the Company Property from loss or damage.

         (ii)  Permanently mark or if impracticable to do so then affix labeling
     stating that the Company Property is the "PROPERTY OF LUCENT TECHNOLOGIES
     INC." For purposes of this section, the term "LUCENT TECHNOLOGIES INC."
     shall be deemed to mean Company or the Company affiliated or associated
     company which owns the tooling, as applicable.

         (iii) Store the Company Property safely, indoors in protected areas
     approved by Company. Store the Company Property segregated from other
     property in sections of Supplier's plant marked Property of Company.

         (iv)  Deliver the Company property only to Company or Company's
     designated customers in accordance with Company's orders or upon Company's
     demand, FOB Supplier's plant without additional charge for removal,
     packing, or crating.

         (v)   Supplier shall not allow an security interest, lien, tax lien or
     other encumbrance (collectively referred to as "encumbrance") to be placed
     on any Company Property. Supplier shall give Company immediate written
     notice should any third party attempt to place or place an encumbrance on
     such Company Property. Supplier shall indemnify and hold Company harmless
     from any such encumbrance. Supplier shall, at Company's request, promptly
     execute a "protective notice" UCC-1 form and all other documents reasonably
     necessary to enable Company to protect its interest in such Company
     Property. This Agreement shall constitute the security agreement required
     by the UCC of the appropriate state.

         (vi) Company may inspect, inventory, and authenticate the account of
     the Company Property during Supplier's normal business hours. Supplier
<PAGE>   26

                                                        Agreement No. WR71980064
                                                                  Sheet 26 of 31
     shall provide Company access to the premises where all such Company
     Property is located.

          The obligations assumed by Supplier with respect to the Company
     Property are for the protection of Company's property. If Supplier defaults
     in carrying out Supplier's obligations under this Agreement, then, at no
     cost to Company and upon twenty-four (24) hours notice to Supplier, Company
     may cancel this Agreement in whole or in part or withdraw all or any part
     of the Company Property, or both. Supplier shall, at Company's option,
     return to Company or hold for Company's disposition any or all of such
     Company Property in Supplier's possession.

64.  SUPPLIER'S INFORMATION
          Supplier shall not provide under, or have provided in contemplation
     of, this Agreement any idea, data, program, technical, business or other
     intangible information, however conveyed, or any document, print, tape,
     disc, semiconductor memory or other information-conveying tangible article,
     unless Supplier has the right to do so, and Supplier shall not view any of
     the foregoing as confidential or proprietary. If Supplier must furnish any
     such information to Company with restrictions, it shall only be furnished
     after negotiation and execution on behalf of Company of a separate written
     agreement specifically identifying the documents to be furnished and
     setting forth Company's rights and obligations with respect hereto.

65.  SURVIVAL OF OBLIGATIONS
          The obligations of the parties under this Agreement which by their
     nature would continue beyond the termination, cancellation or expiration of
     this Agreement shall survive termination, cancellation or expiration of
     this Agreement.

66.  TAXES
          Company shall reimburse Supplier only for the following tax payments
     with respect to transactions under this Agreement unless Company advises
     Supplier than an exemption applies: state and local sales and use taxes, as
     applicable. Taxes payable by Company shall be billed as separate items on
     Supplier's invoices and shall not be included in Supplier's prices. Company
     shall have the right to have Supplier contest any such taxes that Company
     deems improperly levied at Company's expense and subject to Company's
     direction and control.

67.  TECHNICAL SUPPORT
          Company shall be entitled to ongoing technical support including field
     service and assistance, provided, however, that the availability or
     performance of this technical support service shall not be construed as


<PAGE>   27
                                                        Agreement No. WR71980064
                                                                  Sheet 27 of 31


     altering or affecting Supplier's obligations as set forth in the "WARRANTY"
     section or elsewhere provided for in this Agreement.

          Ongoing technical support via telephone will be at no charge to
     Company from Monday to Friday between hours of 8:00AM and 5:00PM.

68.  TERMINATION OF PURCHASE ORDER
          Company may at any time terminate any portion or the total quantity of
     any purchase order(s) placed under this Agreement. Company's liability to
     Supplier with respect to such termination shall be limited to (i)
     Supplier's purchase price of all components for the MATERIAL (not usable in
     Supplier's other operations or salable to Supplier's other customers), plus
     (ii) the actual costs incurred by Supplier in procuring and manufacturing
     MATERIAL (not usable in Supplier's other operations or salable to
     Supplier's other customers) in process as of the date of giving notice of
     termination, less (iii) any salvage value thereof. However, no such
     termination charges will be invoiced if, within [***] days of notice of
     termination, MATERIAL equivalent in kind to that being terminated is
     ordered by Company. If requested, Supplier shall substantiate such cost and
     price with proof satisfactory to Company.

69.  TIMELY PERFORMANCE
          If Supplier has knowledge that anything prevents or threatens to
     prevent the timely performance of the Work under this Agreement, Supplier
     shall immediately notify Company's Representative thereof and include all
     relevant information concerning the delay or potential delay.

70.  TITLE AND RISK OF LOSS
          Title (other than software) and risk of loss and damage to MATERIAL
     including software purchased by Company under this Agreement or an order
     issued pursuant to this Agreement shall vest in Company when the MATERIAL
     has been delivered at the FOB point. If this Agreement or an order issued
     pursuant to this Agreement calls for additional services including, but not
     limited to, unloading, installation, or testing to be performed after
     delivery, Supplier shall retain title and risk loss and damage to the
     MATERIAL until the additional services have been performed. If Supplier is
     authorized to invoice Company for MATERIAL prior to shipment or prior to
     the performance of additional services, title to MATERIAL (other than
     software) shall vest in Company upon payment of the invoice, but risk of
     loss and damage shall pass to Company when the additional services have
     been performed.

71.  TOXIC SUBSTANCES AND PRODUCT HAZARDS
          Supplier hereby warrants to Company that, except as expressly stated
     elsewhere in this Agreement, all MATERIAL furnished by Supplier as


[***]  Confidential treatment has been requested for the bracketed portions.
       The confidential redacted portion has been filed separately with the
       Securities and Exchange Commission.
<PAGE>   28
                                                        Agreement No. WR71980064
                                                                  Sheet 28 of 31


     described in this Agreement is safe for its foreseeable use, is not defined
     as a hazardous or toxic substance or material under applicable federal,
     state or local law, ordinance, rule, regulation or order (hereinafter
     collectively referred to as "law" or "laws"), and presents no abnormal
     hazards to persons or the environment. Supplier also warrants that it has
     no knowledge of any federal, state or local law, that prohibits the
     disposal of the MATERIAL as normal refuse without special precautions
     except as expressly stated elsewhere in this Agreement. Supplier also
     warrants that where required by law, all MATERIAL furnished by Supplier is
     either on the EPA Chemical Inventory compiled under Section 8 (a) of the
     Toxic Substance Control Act, or is the subject of an EPA-approved pre
     manufacture notice under 40 CFR Part 720. Supplier further warrants that
     all MATERIAL furnished by Supplier complies with all use restrictions,
     labeling requirements and all other health and safety requirements imposed
     under federal, state, or local laws. Supplier further warrants that, where
     required by law, it shall provide to Company, prior to delivery of the
     MATERIAL, a Material Safety Data Sheet which complies with the requirements
     of the Occupational Safety and Health Act of 1970 and all rules and
     regulations promulgated thereunder.

          Supplier shall defend, indemnify and hold Company harmless for any
     expenses (including, but not limited to, the cost of substitute material,
     less accumulated depreciation) that Company may incur by reason of the
     recall or prohibition against continued use or disposal of MATERIAL
     furnished by Supplier as described in its Agreement whether such recall or
     prohibition is directed by Supplier or occurs under compulsion of law.
     Company shall cooperate with Supplier to facilitate and minimize the
     expense of any recall or prohibition against use or disposal of MATERIAL
     directed by Supplier or under compulsion of law.

          Supplier further shall defend, indemnify and hold Company harmless of
     and from any claims, demands, suits, judgments, liabilities, costs and
     expenses (including reasonable attorney's fees) which Company may incur
     under any applicable federal, state or local laws, and any and all
     amendments thereto, including but not limited to the Comprehensive
     Environmental Response, Compensation and Liability Act of 1980; the
     Consumer Product Safety Act of 1972; the Toxic Substance Control Act;
     Fungicide, Rodenticide Act; the Occupational Safety and Health Act; and the
     Atomic Energy Act; and any and all amendments to all applicable federal,
     state, or local laws, by reason of Company's acquisition, use, distribution
     or disposal of MATERIAL furnished by Supplier under this Agreement.

72.  TRAINING
          If requested by Company, Supplier will, without charge to Company:


<PAGE>   29
                                                        Agreement No. WR71980064
                                                                  Sheet 29 of 31


          (a) provide instructors and the necessary instructional material of
     Supplier's standard format to train Company's personnel in the
     installation, planning and practices, operation, maintenance and repair of
     MATERIAL furnished under this Agreement. These classes shall be conducted
     at reasonable intervals at locations agreed upon by Supplier and Company.

     Or, at the option of Company,

     (b) provide to Company training modules or manuals and any necessary
     assistance, covering those areas of interest outlined in (a) of this
     section, sufficient in detail, format and quantity to allow Company to
     develop and conduct a training program.

73.  USE OF INFORMATION
          Supplier shall view as Company's property any idea, data, program,
     technical, business or other intangible information, however conveyed, and
     any document, print, tape, disc, tool, or other tangible
     information-conveying or performance-aiding article owned or controlled by
     Company, and provided to, or acquired by Supplier under or in contemplation
     of this Agreement (Information). Supplier shall, at no charge to Company,
     and as Company directs, destroy or surrender to Company promptly at its
     request any such article or any copy of such Information. Supplier shall
     keep Information confidential and use it only in performing under this
     Agreement and obligate its employees, subcontractors and others working for
     it to do so, provided that the foregoing shall not apply to information
     previously known to Supplier free of obligation, or made public through no
     fault imputable to Supplier.

74.  VARIATION IN QUANTITY
          Company assumes no liability for MATERIAL produced, processed or
     shipped in excess of the amount specified in this Agreement or in an order
     issued pursuant to this Agreement.

75.  WARRANTY
          Supplier warrants to Company and Customer, as defined in this section,
     that MATERIAL furnished will be new, merchantable, free from defects in
     design, material and workmanship and will conform to and perform in
     accordance with the Specifications, drawings and samples set forth in this
     Agreement. These warranties extend to the future performance of the
     MATERIAL and shall continue for a period of twelve (12) months from the
     date of delivery to an end user customer (hereinafter "Customer") or, for
     MATERIAL installed by Company or its re-sellers, for a period of twelve
     (12) months from the completion of installation.

          Supplier also warrants to Company and Customers that services will be
     performed in a first class, workmanlike manner. In addition, if MATERIAL


<PAGE>   30

                                                        Agreement No. WR71980064
                                                                  Sheet 30 of 31


     furnished contains one or more manufacturer's warranties, Supplier hereby
     assigns such warranties to Company and Customers. Supplier warrants that at
     the time of delivery to Company such MATERIAL shall be free of any security
     interest or any other lien or any other encumbrance whatsoever. All
     warranties shall survive inspection, acceptance and payment.

          Defective or non-conforming MATERIAL will, at Company's option, either
     be returned to Supplier for repair or replacement, at no cost to Company,
     with risk of in-transit loss and damage borne by Supplier and freight paid
     by Supplier, or be repaired or replaced by Supplier on Customer's site or
     another site designated by Company at no cost to Company. Unless otherwise
     agreed upon by Supplier and Company, Supplier shall complete repairs and
     ship the repaired MATERIAL within ten (10) business days of receipt of
     defective or non- conforming MATERIAL, or at Company's option, ship
     replacement MATERIAL within ten (10) business days after verbal
     notification is given Supplier by Company. Supplier shall bear the risk of
     in-transit loss and damage and shall prepay and bear that cost of freight
     for shipments to Company of repaired or replaced MATERIAL. If requested by
     Company, Supplier shall begin on-site repairs within ten (10) business days
     after verbal notification is given Supplier by Company.

          If MATERIAL returned to Supplier or made available to Supplier on site
     for repair as provided for in this section is determined to be beyond
     repair, Supplier shall promptly so notify Company and, unless otherwise
     agreed to in writing by Supplier and Company, Supplier shall ship
     replacement MATERIAL without charge within ten (10) business days of such
     notification.

          Replacement MATERIAL shall be warranted as set forth above in this
     "WARRANTY" section. Any MATERIAL which is repaired, modified, or otherwise
     serviced by Supplier shall be warranted as provided in this "WARRANTY"
     section for the remainder of the warranty period (based upon the date
     repair, modification or other service is completed and accepted by Company)
     or ninety (90) business days after the MATERIAL is returned to a Customer,
     whichever is later.

          Supplier also warrants that software will record, store, process and
     present calendar dates falling on or after January 1, 2000, in the same
     manner and with the same functionality as it performed before January 1,
     2000. This maintenance will be considered part of and covered under the
     maintenance provisions of the Agreement at no additional charge to Company.

<PAGE>   31


                                                        Agreement No. WR71980064
                                                                  Sheet 31 of 31


76.  ENTIRE AGREEMENT
          This Agreement shall incorporate the typed or written provisions on
     Company's orders issued pursuant to this Agreement and shall constitute the
     entire agreement between the parties with respect to the subject matter of
     this Agreement and the order(s) and shall not be modified or rescinded,
     except by a writing signed by Supplier and Company. Printed provisions on
     the reverse side of Company's orders (except as specified otherwise in this
     Agreement) and all provisions on Supplier's forms shall be deemed deleted.
     Estimates or forecasts furnished by Company shall not constitute
     commitments. The provisions of this Agreement supersede all contemporaneous
     oral agreements and all prior oral and written communications, and
     understandings of the parties with respect to the subject matter of this
     Agreement.

     Accepted (Date)    4-29   19 99
                    ----------   ---

<TABLE>

     MCK COMMUNICATIONS, INC.                                       LUCENT TECHNOLOGIES INC.

     <S>                                               <C>

     ------------------------------------------------- ------------------------------------------------
     By:  /s/ Paul Zurlo                               By:  /s/ R. A. Murphy
     ------------------------------------------------- ------------------------------------------------
     Name (Print) Paul Zurlo                           Name (Print)  R. A. Murphy
     ------------------------------------------------- ------------------------------------------------
     Title   CFO                                       Title    Purchasing Manager
     ------------------------------------------------- ------------------------------------------------
</TABLE>


ATTACHMENTS - The following Attachments are hereby made part of the Agreement:

Appendix A, Price Schedule
Appendix B, Specifications





<PAGE>   32
                                                        Agreement No. WR71980064
                                                                      Appendix A
                                                                          1 of 4


                        DEFINITY EXTENDER PRODUCT MATRIX
<TABLE>
<CAPTION>

     COMCODE                              DESCRIPTION                           MODEL         PEC          PRICE
     <S>            <C>                                                         <C>         <C>             <C>
     40733931       Analog DEFINITY Extender - Switch Module                    845         2174-PSB       [***]

                    This PEC will drive out 1 box, containing the stand-alone
                    Switch Module, a stand-alone power supply, a D8W cord (7'
                    long), a D2R cord (25' long), and a System Administrator's
                    Guide.

    407389907       Analog DEFINITY Extender - Remote Module                    846         2174-RSM       [***]

                    This PEC will drive out 1 box, containing the Remote Module,
                    a stand-alone power supply, a seven foot/two conductor
                    mounting cord, and a User's Guide.

    407444934       POWER, MTCE. STND ALONE - 120V                              PS120       2174-MSP       [***]

                    This PEC can be used to order a maintenance spare, or
                    replacement stand alone power supply for stand alone switch
                    modules, and/or stand-alone remote modules.

    407445733       MOUNTING BRACKET - SINGLE UNIT                              WB102       2174-MTG       [***]

                    This PEC will drive out one metal mounting bracket. This
                    bracket may be used to mount either one stand alone switch,
                    or one stand alone remote module, to a wall, desk, or other
                    suitable vertical surface.

    407564905       EXTENDER-PBX-PLUG IN UNIT                                   855L1       2174-PCB       [***]

                    This PEC is used to order one rack mountable DEFINITY
                    Extender Switch Module. This rack mountable module can not
                    be used on a stand-alone basis. A DEFINITY Extender
                    multi-mount (PEC #2174-BMM or #2174-48V), listed above, is
                    required for use with this unit.
    407564921       EXTENDER MULTI-MOUNT - 120V AC                              855L1       2174-BMM       [***]

                    This PEC will provide one box containing one DEFINITY
                    Extender Multi-Mount Card Frame, and one 120 Volt/60 Hz
                    power supply. This multi-mount will hold up to twelve (12)
                    rack mountable DEFINITY Extenders (Analog Version). In
                    addition to providing a nesting place and power for the
                    plug- in DEFINITY Extender Modules, the multi-mount also
                    provides a means to connect the analog circuits and DCP
                    ports to the modules, A twenty five pair connecting cable,
                    of proper length for the particular installation, and the
                    appropriate connecting block(s) for the wall field must be
                    sourced locally.
    407564939       EXTENDER MULTI-MOUNT - 48V DC                               855L3       2174-48V       [***]

                    This DC to DC converter should be ordered only for those
                    applications where input voltage will be 48 Volts Direct
                    Current. This product is not stocked, and is offered with an
                    eight week interval. This PEC will provide one box
                    containing one DEFINITYa Extender Multi-Mount Card Frame,
                    and one 48 volt DC to DC converter. This multi-mount will
                    hold up to twelve (12)


</TABLE>

[***]  Confidential treatment has been requested for the bracketed portions.
       The confidential redacted portion has been filed separately with the
       Securities and Exchange Commission.
<PAGE>   33

                                                        Agreement No. WR71980064
                                                                      Appendix A
                                                                          2 of 4


<TABLE>


     <S>            <C>                                                         <C>         <C>             <C>
                    rack mountable DEFINITY Extenders (Analog Version). In
                    addition to providing a nesting place and power for the
                    plug-in DEFINITYa Extender Modules, the multi-mount also
                    provides a means to connect the analog circuits and DCP
                    ports to the modules. A twenty five pair connecting cable,
                    of proper length for the particular installation, and, the
                    appropriate connecting block(s) for the wall field must be
                    sourced locally.

    407564897       PASSWORD ADMIN SOFTWARE                                     855L4       2174-PSA       [***]

                    This PEC will drive out one Windows based, 3.5" floppy disk,
                    which is required to administer passwords for the rack
                    mountable DEFINITYa Extenders (Analog Version).
    407578392       POWER SUPPLY SHELF                                          2174-PSS    2174-PSS       [***]

                    This PEC is used to order a metal shelf, which can be used
                    as a flat surface on which to mount up to three Multi-mount
                    power supplies. It can be used with either the 120 volt AC
                    power supply, or the 48 volt DC to DC converter.

    407578368       MTCE BULK POWER - 120V AC                                   PSF110-     2174-PAC       [***]
                                                                                120VAC

                    This PEC can be used to order a maintenance spare, or a
                    replacement bulk stand alone power supply for maintenance
                    purposes.

    407578384       MTCE BULK POWER - 48V DC                                    2174-PDC    2174-PDC       [***]

                    This PEC ran be used to order a maintenance spare, or a
                    replacement bulk stand alone power supply (DC to DC
                    converter) for maintenance purposes.

    407582899       EXTENDER MULTI-MOUNT - without power                        P855L2       2174-CFO      [***]

    407802966       ISDN DEFINITY Extender - Remote Module                      876          2174-R2D      [***]

                    This PEC will drive out 1 box, containing the Remote Module,
                    a stand-alone power supply, a seven foot/two conductor
                    mounting cord, and a User's Guide. Does not include TA.

    407802958       ISDN DEFINITY Extender - Switch Module                      875          2174-P2D      [***]

                    This PEC will drive out 1 box, containing the standalone
                    Switch Module, a stand-alone power supply, a D8W cord (7'
                    long), a D2R cord (25' long), and a System Administrator's
                    Guide. Does not include TA.

    407802982       ISDN DEFINITY Extender for Western Europe-- Remote          876WE        2174-RWE      [***]
                    Module

                    This PEC will drive out I box, containing the Remote Module,
                    a stand-alone power supply, a seven foot/two conductor
                    mounting cord, and a User's Guide. Does not include TA.

    407802974       ISDN DEFINITY Extender for Western Europe- Switch Module    875WE        2174-PWE      [***]

                    This PEC will drive out 1 box, containing the stand alone
                    Switch Module, a stand-alone power supply, a D8W cord (7'
                    long), a D2R cord (25' long), and a

</TABLE>

[***]  Confidential treatment has been requested for the bracketed portions.
       The confidential redacted portion has been filed separately with the
       Securities and Exchange Commission.
<PAGE>   34

                                                        Agreement No. WR71980064
                                                                      Appendix A
                                                                          3 of 4


<TABLE>


     <S>            <C>                                                         <C>         <C>            <C>


                    System Administrator's Guide. Does not include TA.

    407809433       ISDN DEFINITY Extender for the UK- Remote Module            876UK        2174-RUK      [***]

                    This PEC will drive out 1 box, containing the Remote Module,
                    a stand-alone power supply, a seven foot/two conductor
                    mounting cord, and a User's Guide. Does not include TA.

    407809425       ISDN DEFINITY Extender for the UK- Switch Module            875UK        2174-PUK      [***]

                    This PEC will drive out 1 box, containing the stand-alone
                    Switch Module, a stand-alone power supply, a D8W cord (7'
                    long), a D2R cord (25'long), and a System Administrator's
                    Guide. Does not include TA.

      New
    407924653       ISDN DEFINITY Extender - Switch Module                      2100         2174-P1D      [***]

                    This PEC will drive out 1 box. containing the stand-alone
                    Switch Module, a stand-alone power supply, a D8W cord (7'
                    long), a D2R cord (25' long), and a System Administrator's
                    Guide. Includes integrated TA.

    407924661       ISDN DEFINITY Extender - Remote Module                      2101         2174-R1D      [***]

                    This PEC will drive out 1 box, containing the Remote
                    Module, a stand-alone power supply, a seven foot/two
                    conductor mounting cord, and a User's Guide.  Includes
                    integrated TA.

      New
    407975051       Analog DEFINITY Extender - Remote Module                    1101         2174-RSP      [***]

                    This PEC will drive out 1 box, containing the Remote Module,
                    a stand-alone power supply, a seven foot/two conductor
                    mounting cord, and a User's Guide.

    407974831       Analog DEFINITY Extender - Switch Module                    1100         2174-PSP      [***]

                    This PEC will drive out 1 box, containing the stand-alone
                    Switch Module, a stand-alone power supply, a D8W cord (7'
                    long), a D2R cord (25' long), and a System Administrators
                    Guide.

    407995489       Trade-In Analog DEFINITY Extender - Switch Module           1100T        2174-TI       [***]

                    This PEC will drive out 1 box, containing the standalone
                    Switch Module, a stand-alone power supply, and a System
                    Administrators Guide.

    407995497       Trade-In Analog DEFINITY Extender - Remote Module           1101T        2174-TIP      [***]

                    This PEC will drive out 1 box, containing the Remote Module,
                    a stand-alone power supply, and a Users Guide.
============================================================================================================================
    408039996       DEFINITY EXTENDER Rack System                               3000         2174-RAK      [***]

                    This PEC will provide one box containing one DEFINITY
                    Extender Rack System. This rack will hold up to twelve (12)
                    cards, either analog or ISDN. The rack includes a built-in
                    power supply and fan.

                    The rack also provides a means to connect the analog and
                    ISDN circuits and DCP ports to the modules. A
</TABLE>

[***]  Confidential treatment has been requested for the bracketed portions.
       The confidential redacted portion has been filed separately with the
       Securities and Exchange Commission.
<PAGE>   35
                                                        Agreement No. WR71980064
                                                                      Appendix A
                                                                          4 of 4

<TABLE>
<CAPTION>
     <S>            <C>                                                         <C>         <C>            <C>

                    twenty five pair connecting cable, of proper length for the
                    particular installation, and the appropriate connecting
                    block(s) for the wall field must be sourced locally.

    406040020       Switch Management Interface SOFTWARE                        SMI         2174-RAK      [***]

                    This PEC will drive out two Windows based, 3.5" floppy disk,
                    used for simultaneous configuration, status,
                    troubleshooting, monitoring, and software upgrades for all
                    12 Switch Cards. The Switch Management Interface software is
                    year 2000 compliant. and requires Windows 95, or Windows NT
                    4.0 or higher to operate properly.

    408039980       Analog DEFINITY Extender Rack Card                          3100        2174-ACD      [***]

                    This PEC will drive out one analog rack card that will
                    extend one remote user per card for a-total of 12 users per
                    rack.

    408088714       ISDN DEFINITY Extender Rack Card                            3200        2174-ICD      [***]

                    This PEC will drive out one ISDN rack card that will extend
                    two remote users per card for a total of 24 users per rack.

</TABLE>


[***]  Confidential treatment has been requested for the bracketed portions.
       The confidential redacted portion has been filed separately with the
       Securities and Exchange Commission.
<PAGE>   36

                                                        Agreement No. WR71980064
                                                                      Appendix B
                                                                          1 of 2

                     DEFINITY EXTENDER PRODUCT DESCRIPTIONS

ANALOG DEFINITY EXTENDER - MODEL 845/846
The Lucent Technologies DEFINITY(R) Extenders (Analog Version), one at the
switch location and one at a remote site, will allow customers to use
proprietary Lucent Technologies DCP Telephone Sets at locations other than where
the DEFINITY(R) ECS is located. The full function digital DCP terminal at the
remote site will look and perform exactly as it would if it were connected
directly to the DEFINITY(R) ECS.

This will be accomplished through the use of two (2) DEFINITY(R) Extenders
(Analog Version), and either a dial-up analog line, or a dedicated circuit.
Prior to the introduction-of this product, users were required to be co-located
with their DEFINITY(R) System in order to use a digital DCP telephone set.

The introduction of the DEFINITY(R) Extenders (Analog Version) provides a much
requested solution for our customers, who are experiencing ever increasing
pressure to provide remote office solutions for their employees.

ANALOG CENTRAL SITE RACK DEFINITY EXTENDER - MODEL 855
The Lucent Technologies DEFINITY(R) Extenders Central Site Rack System (Analog
Version) one at the switch location, will allow customers to use proprietary
Lucent Technologies DCP Telephone Sets at locations other than where the
DEFINITY(R) ECS is located. The full function digital DCP terminal at the remote
site will look and perform exactly as it would if it were connected directly to
the DEFINITY(R) ECS.


This will be accomplished by packaging analog switch module cards into a rack
system. Each rack has 12 slots across. This allows for reduced footprint, for
multiple installs and a reduction in the per port cost.

ISDN DEFINITY EXTENDER - MODEL 875/876
The ISDN DEFINITY Extender* system adjunct allows users to make and receive
calls from a remote location via an ISDN circuit while appearing to be in the
office. The ISDN DEFINITY Extender has two modules- the DEFINITY Extender Switch
Module and the DEFINITY Extender Remote Module.


Using an 8410D, 8410DR, 8411D, 8434, or a Callmaster(R) III (603E) voice
terminal, the Extender allows remote users to access system features such as
display, multiple call appearance, transfer, voice mail, message light and
conference. Outgoing calls can be made by the remote user using the DEFINITY

Enterprise Communications Server (ECS) network facilities. A terminal adapter is
required at both ends of an ISDN circuit to make an ISDN connection.

<PAGE>   37

                                                        Agreement No. WR71980064
                                                                      Appendix B
                                                                          2 of 2

The introduction of this product permits users to enter a Call-On-Demand (COD)
Mode which automatically drops the dial-up connection to the central site after
a predetermined period of time.

With the analog version of this product, users can also connect a remote digital
telephone set to their DEFINITY ECS. Because standard analog call connections
take much longer than the two seconds it takes to establish an ISDN call, users
must usually remain logged-on for the duration of their work tour.

NEW ISDN DEFINITY EXTENDER - MODEL 2100/2101
The (SDN DEFINITY Extender central site (model 2100) and remote site (model
2101) data modules improve upon the first generation of ISDN DEFINITY Extender
units (PEC 2174-R2D and 2174-P2D). The new units include an integrated terminal
adapter, support 56 Kbps or 64 Kbps of data on one B-channel, and deliver
improved voice quality on the second B-channel for the same price as the first
generation product.

NEW ANALOG DEFINITY EXTENDER - MODEL 1100/1101
The Analog DEFINITY Extender central site module (model 1100) and remote site
module (model 1101) data modules improve upon the first generation of Analog
DEFINITY Extender units (PEC 2174-PSB and 2174-RSM). The new units include an
advanced V.34 modem, which enhances voice quality and reduces retrains. The data
transmission rate supports up to 20 Kbps with voice traffic. In addition two new
features have been added: Call On Demand and Dial Back.


<PAGE>   1
CONFIDENTIAL TREATMENT HAS BEEN REQUESTED FOR CERTAIN REDACTED PROVISIONS OF
THIS AGREEMENT. THE REDACTED PROVISIONS ARE IDENTIFIED BY THREE ASTERISKS AND
ENCLOSED BY BRACKETS. THE CONFIDENTIAL PORTION HAS BEEN FILED SEPARATELY WITH
THE SECURITIES AND EXCHANGE COMMISSION.


                                                                   EXHIBIT 10.16

                            MASTER SUPPORT AGREEMENT

This Master Support Agreement is made this 28th day of June, 1999, (the
"Effective Date"), by and between MCK Communications, Inc. ("MCK"), located at
313 Washington Street, Newton, MA 02458 and VITAL NETWORK SERVICES, L.L.C.

("VITAL") 6 Rubber Avenue, Naugatuck, CT 06770.

WHEREAS, MCK markets certain equipment and services to Customers worldwide, and
in connection therewith offers on-site installation, maintenance and value-add
services to such Customers;

WHEREAS, VITAL provides on-site installation, maintenance and value-add
servicing of communications equipment worldwide;

WHEREAS, VITAL has a worldwide infrastructure to perform on-site installation,
maintenance and value-add services and desires to provide such services for MCK;
and

WHEREAS, MCK desires to engage VITAL as an independent contractor in performing
global on-site installation, maintenance and value-add services;

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

1.   DEFINITIONS.

          1.1 "Affiliate" shall mean any entity worldwide, which directly or
          indirectly controls, is controlled by or under common control with
          VITAL.

          1.2 "Advance Replacement" means a process to ship replacement Product
          components in advance of receipt of failed/defective Product
          components.

          1.3 "Authorized Service Area" means an area within one hundred (100)
          miles of a VITAL Service City.

          1.4 "Customer" means the final end-user, purchaser or licensee who has
          acquired Product(s) for their own internal use and not for resale,
          remarketing, or redistribution, whether directly from MCK or through
          other sources, and of whom MCK has received notification of and who is
          entitled to support and maintenance services for such Products.

          1.5 "First Level Support" means the ability to provide general Product
          information and configuration support; collect relevant technical
          problem identification information; perform base problem
          determination; provide basic support on the standard protocols and
          features; go on-site at Customer location to obtain information if
          situation requires.

          1.6 "Response" means the time period commencing upon MCK's or a
          Customer's request for service hereunder and ending when the VITAL
          Field Engineer is on-site.

          1.7 "Hardware" means tangible Product made available to VITAL.

          1.8 "Maintenance Release" or "Patch" means an incremental release of
          MCK Software that provides maintenance fixes.

          1.9 "Parts Depot" means MCK Parts Depot which provides support
          required for this program.

<PAGE>   2

          1.10 "Product" means both Hardware and/or Software listed in Appendix
          A, which VITAL may support under the terms of this Agreement. Products

          include Service Parts.

          1.11 "RMA" means Return Material Authorization.

          1.12 "Second Level Support" means First Level Support plus the ability
          to support problem isolation and Product specification defect
          determination; provide lab simulation and interoperability testing;
          define an action plan; analyze traces; provide support on all
          protocols and features; reproduce problems in a lab, diagnose problems
          remotely and provide MCK with complete steps to reproduce a problem.

          1.13 "Service(s)" means support provided by VITAL that includes but is
          not limited to installation, maintenance and value-add programs.

          1.14 "Service Part" means a component or sub-assembly of a Product,
          excluding cables and/or all software, and is also referred to as Field
          Replaceable Unit (FRU).

          1.15 "Site" means and includes the premises where the Product is to be
          installed or is located.

          1.16 "Software" means the machine-readable object code software
          programs licensed by MCK.

          1.17 "Standard Business Hours" means 8:00 AM to 5:00 PM Local Standard
          Time, Monday through Friday, excluding VITAL observed holidays.

          1.18 "Third Level Support" means fixing or generating workarounds for
          Hardware and Software bugs and troubleshooting bugs that were not
          diagnosed during Second Level Support.

          1.19 "Unrelated Services" means any other Service, in addition to the
          Services authorized by MCK and provided by VITAL to a Customer.

          1.20 "Update" means Maintenance Releases, Version Releases and/or
          Major Releases which contain the same configuration as originally
          acquired.

          1.21 "Primary Provider" means MCK will promote VITAL internally and to
          its Customers for worldwide service deliveries.

          1.22 Valued- Added Services means Help Desk and telephone support
          services.

2.   SCOPE,  SERVICE ORDERS AND TERM.

          2.1 Authorization. MCK hereby appoints VITAL as a non-exclusive,
          primary provider of on-site services to MCK's Customers located
          throughout the world.

          2.2 Support Services. MCK support services specified below at Section
          4 are provided to VITAL as backup to the support staff of VITAL. VITAL
          is primarily responsible for providing on-site support and telephone
          support Services to MCK's Customers for whom VITAL receives a purchase
          order hereunder.

          2.3 MCK shall issue a purchase order to order Services. Such order
          requires a Services schedule and/or Statement of Work for the specific
          Customer or site location signed by MCK.

                                                                               2

<PAGE>   3

          2.4 Obligation to Customers. Other than the Services agreed to in this
          document, neither VITAL nor MCK will make any obligation to Customers
          on behalf of the other, nor commit the resources of the other to
          Customers without the other's consent.

          2.5 Implementation. MCK and VITAL will implement the terms of this
          Agreement worldwide.

          2.6 Term. This Agreement shall be effective as of the Effective Date
          and shall remain in full force and effect for an initial term of
          twenty-four (24) months, unless sooner terminated pursuant to Section
          7. This Agreement shall be automatically renewed for additional
          successive twelve (12) month terms unless either party gives the other
          party at least ninety (90) days written notice of its intention not to
          renew prior to the anniversary date of the Agreement.

          2.7 Relationship of Parties. It is understood by the parties hereto
          that VITAL is an independent contractor and not an employee or agent
          of MCK and MCK is not an agent of VITAL. MCK will not provide fringe
          benefits or insurance coverage on behalf of VITAL except for sales tax
          payable by MCK as provided in Section 7.2. VITAL shall be responsible
          for the withholding and/or payment, as required by law, of all
          federal, state and local taxes imposed on VITAL and its employees due
          to the performance of Services or any other obligation under this
          Agreement.

3. VITAL OBLIGATIONS. VITAL shall provide the following Services to MCK:

          3.1 On-site Support.

                    3.1.1 Services. VITAL shall provide on-site installation,
               maintenance and value-add Services to MCK Customers during
               contracted local business hours. Available Services, response
               times and hours are identified in VITAL supplements provided
               under separate cover.

                    3.1.2 On-site service includes: 1-800 number access,
               round-the-clock travel to the Customer site, on-site labor,
               problem diagnosis, fault isolation, equipment adjustment,
               equipment replacement and on-line testing with VITAL standard
               test equipment.

                    3.1.3 Special test equipment. Special test equipment
               requirements identified by MCK will be provided by MCK to VITAL
               prior to development of VITAL price calculations.

          3.2 Technical Support.

                    3.2.1 VITAL will provide first and second Level Support.
               VITAL shall establish problem priorities with MCK consistent with
               problem priority definitions as described below. All problems
               reported to VITAL technical support will be prioritized and
               escalated to MCK based on such guidelines set forth by MCK.

               (Reference Attachment C)

                    3.2.2 VITAL shall report unresolved cases to MCK within the
               following time frames beginning at such time that a problem is
               given a priority as defined below:


                                                                               3
<PAGE>   4

                         Priority 1. No later than four (4) hours from initial
                    MCK notification to VITAL. Priority 1 calls defined as
                    responding to MCK / End Users while in a troubleshooting
                    mode.

                         Priority 2. No later than eight (8) business hours from
                    initial MCK notification to VITAL. Priority 2 call defined
                    as responding to MCK / End User configuration questions
                    during normal network operation.

                         Priority 3. No later than three (3) business days from
                    initial MCK notification to VITAL. Priority 3 calls defined
                    as responding to MCK / End User general technical questions
                    during normal network operation.

          3.3 Software Distribution Rights. VITAL may distribute, on a
          non-exclusive basis, MCK provided Updates and Patches to Customers.

          3.4 Service Parts Inventory

                    3.4.1 MCK will consign local spare parts kits to VITAL
               Logistics per VITAL recommendations and/or mutually agreed to
               spare ratio. Repair of such consigned Product will be at MCK
               expense.

                    3.4.2 VITAL will use all consigned service parts kits only
               for the remedial maintenance of MCK Product. VITAL will not
               resell service parts to Customers for upgrades, system expansion
               or any other reason outside the scope of remedial maintenance.

                    3.4.3 A Logistics Management fee will be applied by VITAL to
               the Customer only if there is not a contract arrangement in place
               that requires VITAL to provide the consigned part. (See
               Attachment B).

          3.5 Consigned Product Receipt/Return; Notification.

                    3.5.1 VITAL is responsible for the following when receiving
               consigned spare parts and/or Advance Replacements and returning
               replaced Product under Section 4.1.3:

                              3.5.1.1 When receiving consigned spare parts,
                    Advance Replacements and/or returning replaced product under
                    Section 4.1.3, VITAL is responsible for the following:

                    VITAL Logistics will inspect all parts received from MCK to
                    verify any damage in transit. Damaged and/or mis-shipments
                    will be reported to MCK immediately but not longer than five
                    (5) business days of receipt.

                              3.5.1.2 Returns Coordination.

                                        3.5.1.2.1 VITAL shall return all
                         defective Product(s) within ten (10) days of the
                         receipt of the replacement Product.

                                                                               4

<PAGE>   5

                                        3.5.1.2.2 VITAL shall coordinate the
                         return of all failed Product, freight and insurance
                         prepaid, to the MCK designated repair center.

                                        3.5.1.2.3 VITAL shall comply with the
                         following RMA procedure:

                         i.   VITAL will ensure all Products are properly
                              packaged prior to being shipped, and will include
                              a description of the failure and written
                              specification of any changes or alterations made
                              to the Product. Product returned to MCK will
                              conform in quantity and to the RMA request.

                         ii.  VITAL shall tag each Product returned with a
                              transaction number and a brief description of the
                              problem.

                    3.5.2 For consigned products utilized during remedial
               maintenance service as defined in Section 4.1.3, VITAL will be
               responsible for the following:

                              3.5.2.1 Accountability. VITAL will provide and
                         retain records for all operational activities for MCK
                         Customers supported under this Agreement, including the
                         location(s) and hardware configuration of that
                         Customer.

                              3.5.2.2 Technical Assistance. Isolate product
                         problems to the Service Parts level, including
                         providing technical assistance to VITAL's field support
                         engineers which includes, at a minimum, hardware
                         problem identification and resolution.

                              3.5.2.3 Repackaging/Return of Service Parts. VITAL
                         will comply with the following return procedure.

                         i.        VITAL will return defective Service Parts per
                              MCK's instructions.

                         ii.       VITAL will repackage defective Service parts
                              and deliver to central pick-up location at the
                              Customer site.

                         iii.      VITAL will inform MCK of pick-up location and
                              site contact/focal point for defective Service
                              Parts retrieval.

          3.6 Help Desk Coordination. VITAL will represent MCK in answering and
          coordinating a toll free customer service number. (See Attachment E)

          3.7 Product Inspection. If required by MCK prior to putting previously
          installed product under support, VITAL will visit the Customer to
          ensure Product has been maintained in adherence to the maintenance
          procedures as detailed in the applicable user information (supplied
          with product upon initial sale/resale). Each Site visit will be
          charged at current Time and Material rates in effect or pre-agreed to
          price schedule.

          3.8 Significant New Products. For significant new Products added to
          the price list and/or not directly listed in Appendix A of this
          Agreement, including Products which become MCK Products as a result of
          an acquisition by MCK of another entity, MCK may require certain
          certification, installation, or training requirements be completed by

                                                                               5

<PAGE>   6

          VITAL, as MCK would for all other MCK service providers, prior to
          allowing VITAL to support such Products from MCK.

          3.9 Focal Points. VITAL will identify at least one (1) individual to
          manage the implementation of this Agreement, serve as focal point for
          MCK's monitoring of support services provided under this Agreement,
          and act as the focal point for day-to-day service issues.

          3.10 Records. VITAL will maintain electronic records of Product under
          coverage at all Customer sites.

          3.11 Direct Customer Services Option. VITAL may resell its own brand
          of services for Products directly to MCK customers under the following
          circumstances: 1) In a multi-vendor environment where the MCK
          installation base is less than 50% of the network and 2) if there is
          not an existing service agreement directly with MCK in the first
          twelve months after the initial installation. It is not the intention
          of VITAL to directly solicit existing or potential Customers of MCK
          for service of Products without prior approval of MCK. Under every
          circumstance, VITAL will not solicit any such business unless MCK
          gives prior approval. If VITAL is granted permission by MCK to quote
          and support a customer as the prime to the extent permitted by law,
          VITAL 1) will resell services at a higher rate than the published
          prices in MCK's service offering and 2) guarantee MCK at least
          comparable service revenue as detailed in the terms of Schedule B.

          3.12 Personnel. VITAL shall select, employ, pay, supervise, direct and
          discharge all VITAL personnel providing Services hereunder. VITAL
          shall be solely responsible for the payment of all fringe benefits and
          any other direct and indirect compensation for VITAL personnel
          assigned to perform Services under this Agreement, as well as be
          responsible for their worker's compensation insurance, employment
          taxes, and other employer liabilities relating to such personnel as
          required by law to be provided.

          3.13 Staffing of Personnel. VITAL shall be solely responsible for
          assigning personnel to perform the Services, which personnel will be
          instructed by VITAL to perform the Services in a timely, efficient and
          workmanlike manner. MCK shall have the right to request that personnel
          not performing Services properly and in accordance with reasonable
          technical or general work standards who do not promptly correct such
          performance be replaced by VITAL with competent and suitable
          personnel.

4. MCK OBLIGATIONS. MCK will provide the following services to VITAL:

          4.1 Support for VITAL includes technical support, training, and
          software support and hardware/spare support as follows:

                    4.1.1 Technical Support.

                              4.1.1.1 MCK shall provide 24-hour 7- day a week
                         access to MCK Engineering Resources. MCK will respond
                         to VITAL within one half (1/2) hour to all calls
                         received during Standard Local Business hours and to
                         Priority 1 and 2 calls received outside Standard Local
                         Business Hours. For Priority 3 calls received outside
                         Standard Local Business Hours, MCK will respond no
                         later than the next business day. (Reference 3.2.2 for
                         Priority definitions)

                              4.1.1.2 MCK will provide Third Level Support to
                         VITAL.

                                                                               6

<PAGE>   7

                              4.1.1.3 Once a problem is reported by MCK or a
                         Customer, MCK and VITAL will work closely together to
                         resolve the Customer problem. It is VITAL's
                         responsibility to log the incoming fault report
                         received by VITAL and to provide the necessary local
                         on-site and headquarters technical resources to resolve
                         problems reported by MCK within the scope of this
                         Agreement.

                              4.1.1.4 If a problem is escalated back to MCK,
                         VITAL will assign a local technical support person to
                         work the resolution of the problem with MCK. MCK will
                         supply the appropriate level of technical resources,
                         based on problem priority and elapsed time, to assist
                         VITAL with problem resolution and to ensure adherence
                         to MCK's Problem Prioritization and Escalation
                         Guideline as described in Attachment C. During such
                         problem escalation, if it is mutually agreed that MCK
                         on-site technical resources are required for final
                         resolution, MCK will dispatch the necessary level of
                         technical support to assist VITAL at no charge. VITAL
                         will ensure a local technical support person is
                         available to work with MCK on-site. VITAL, with the
                         assistance of MCK, will be responsible for providing
                         the Customer with the necessary updates for resolution
                         of the problem.

                    4.1.2 Software and Software Support

                              4.1.2.1 Software Releases. MCK will provide
                         Updates and one (1) paper copy of supporting
                         documentation for Product supported under this
                         Agreement as identified in Attachment A for VITAL lab
                         use. For Product noted by an asterisk, only Maintenance
                         Releases are available. MCK shall also provide
                         supporting documentation on Disk/CD ROM, upon request,
                         and if available. Additional paper copies of supporting
                         documentation may be reproduced by VITAL.

                              4.1.2.2 Release Support. MCK, in meeting support
                         obligations, may require VITAL to upgrade its Customer
                         to a supported release which may be charged at VITAL's
                         current Time and Material rates or agreed to price
                         schedule to MCK.

                              4.1.2.3 Software Patches. When required to fix a
                         fault, MCK will provide new Software to VITAL to
                         initiate corrective action or provide a
                         network-bootable Software image, as VITAL and MCK
                         agree.

                              4.1.2.4 Software Updates and/or Patches will be
                         provided to VITAL for distribution only on Product for
                         which Customer is licensed to use the Software and
                         pursuant to a current maintenance agreement for such
                         Product.

                    4.1.3 Hardware Support. MCK shall provide the following
               hardware replacement service at no charge for Product supported
               by VITAL and identified in Appendix A.

                              4.1.3.1 Product used for replacement may be new or
                         equivalent to new, at MCK's discretion.

                                                                               7

<PAGE>   8

                              4.1.3.2 Product used for replacement will be
                         repaired by MCK at no charge to VITAL.

                              4.1.3.3 Product documentation will be provided to
                         VITAL at no charge.

                              4.1.3.4 End of Life. For the duration of this
                         Agreement, MCK agrees to provide Hardware replacement
                         support for three (3) years following the date of
                         announced end of life of the Product.

          4.2 Training and Education

                    4.2.1 As part of the initial training, MCK shall train a
               minimum of four (4) VITAL central technical support persons with
               MCK recommended training course(s). Up to four training course(s)
               will be provided by MCK at no cost to VITAL. Training will be
               held at VITAL's headquarters in Naugatuck, Connecticut and/or
               regional offices throughout the world; dates and locations to be
               determined by mutual agreement. Employee expenses will be borne
               by VITAL. VITAL agrees to have at least eight (8) trained
               regional technical support employees within two (2) months from
               the effective date of this Agreement.

                    4.2.2 MCK shall train additional employees as mutually
               agreed necessary to support Customer contract obligations covered
               under contracted VITAL support programs. Additional training for
               field staff will be the responsibility of VITAL based on
               like/same hardware and software.

                    4.2.3 If requested by VITAL, MCK will provide a
               Train-the-Trainer Program at no charge that allows VITAL
               instructors to train internal staff on MCK's Products.

                    4.2.4 Alternative Training. Videos, CD-ROM's or diskettes,
               if available by MCK, will be provided to VITAL at no charge to
               train field personnel and will be returned to MCK upon completion
               of training.

          4.3 Alternative Provisioning Purchase of Product to VITAL

                    4.3.1 MCK will permit purchase of Service Parts for VITAL to
               provide support to VITAL direct Customers. MCK will sell to VITAL
               Service Parts at MCK's then current published list price, less a
               [***] discount.

                    4.3.2 To assist VITAL in setting up a working laboratory for
               network simulation and integration analysis, MCK agrees to
               consign VITAL an appropriate number of laboratory units per year.
               VITAL agrees to use such units solely for support purposes under
               the terms of this agreement and not for resale purposes.

          4.4 Record Keeping. Product Configuration and Location Change Notice.
          MCK will provide Notice of or any change in i) the Hardware or
          Software component and ii) the location of any Customer Product. If
          notification is not provided to VITAL, VITAL will invoice for
          additional charges due to changes in product configuration or
          location, calculated from the date of installation.




[***]  Confidential treatment has been requested for the bracketed portions.
       The confidential redacted portion has been omitted and filed separately
       with the Securities and Exchange Commission.


                                                                               8

<PAGE>   9

5.   INTELLECTUAL PROPERTY

          5.0 Ownership of Property. Title to and ownership of any and all
          intellectual property utilizing Product information (e.g. patents,
          copyrights, trademarks)), including but not limited to Hardware,
          Software, Updates, Patches, reports, code and data, developed and/or
          created by VITAL in connection with this Agreement shall immediately
          vest in MCK and VITAL shall have no rights to such property except a
          nonexclusive license to use in connection with service of Products.

6.   SERVICE EXCLUSIONS

          Services provided by VITAL do not include nor shall VITAL be
          responsible for any of the services listed below. VITAL shall provide
          MCK with a time and materials quotation to perform such services if
          requested by MCK.

          6.1 Any customization of Software.

          6.2 Support or replacement of Product that is altered, modified,
          mishandled, destroyed or damaged by natural causes or damaged during
          unauthorized use.

          6.3 Services to resolve Software or Hardware problems resulting from
          third party product or causes beyond MCK's control.

          6.4 Services for non-MCK Software installed on any MCK Product.

          6.5 Any Hardware upgrade required to run new or updated Software.

          6.6 Non-contract related on-site diagnostics and/or remedial services
          unless authorized by MCK.

7.   CHARGES AND PAYMENTS

          7.1 VITAL shall invoice MCK for the Contract Price for Services, as
          defined by Appendix B, performed and for any amounts due for Unrelated
          Services performed according to the payment schedule described in
          Attachment B. Each invoice shall include supporting documentation and
          details of the Services and Unrelated Services performed. MCK shall
          pay any amounts due within thirty (30) days of receipt thereof.

          7.2 The stated charges, prices, fees or other amounts to be invoiced
          and paid pursuant to this Agreement, do not include any applicable
          Federal, State, County or local sales, use, property, excise taxes
          customs, import and export duties, VAT or other tax however
          designated, regardless of how or on whom the tax is levied and whether
          such tax is based on any charge, price, fee or other amount, (the
          Product, or service or their use) pursuant to this Agreement. Any such
          taxes and interest on them (except taxes based on VITAL's or MCK' net
          income) required to be paid by VITAL shall be added to the invoices.
          Any taxes to be paid by MCK, but in fact paid by VITAL, shall be
          reimbursed to VITAL. In the event any taxes to be paid by MCK, but
          levied on VITAL, are not paid until audit, VITAL may then invoice
          Customer. Customer may submit a certificate of Exemption for each
          state in which it is registered to do business and exempted from
          payment of any tax, and failure to do so does not imply the
          responsibility as that of VITAL.

          7.3 Unrelated Service. VITAL shall not perform any Unrelated Service
          without the prior written or verbal consent of an authorized MCK
          representative. MCK will supply a list of authorized individuals under
          separate cover. If MCK agrees that such Unrelated

                                                                               9

<PAGE>   10

          Service is necessary for a Customer, VITAL shall supply such Unrelated
          Service and invoice MCK therefore at the rates set forth in Attachment
          B.

          7.4 Invoicing. Invoices for installation and Unrelated Service shall
          be rendered monthly. Invoices for maintenance and value-add contract
          Services shall be rendered quarterly, in advance subject to the
          minimum payments under Section 7.5.

          7.5 Minimum Payments. As defined by Appendix B in consideration of
          VITAL's entering into this Agreement and commitment to provide
          services, MCK owes VITAL minimum quarterly payments that aggregate
          $250,000 for Year 1 of the contract and $200,000 for Year 2 of the
          contract. Any service revenue generated by VITAL from MCK contracts is
          automatically applied against these minimum payments. Any service
          revenue generated by MCK in Year 1 that is in excess of $250,000 is
          automatically applied against MCK's Year Two minimum payment. If
          revenue meets or exceeds the total twenty four (24) month commitment
          of $450,000 anytime during the contract term, MCK has met all its
          minimum revenue obligations to VITAL.

          7.6 In addition to other remedies available to VITAL, overdue invoices
          may bear a late payment charge at the rate of one (1) percent
          commencing on the 31st day, but in no event in excess of the lawful
          maximum. In the event an invoice is more than sixty (60) days past due
          and such invoice has not been paid by MCK within sixty (60) days after
          the receipt by MCK of written notice that such invoice is more than
          sixty (60) days due, VITAL may withhold performance hereunder until
          such invoice is paid.

          7.7 Books and Records; Audits. VITAL shall maintain full and accurate
          books, records and accounts of all Services rendered pursuant to this
          Agreement in such a way as to disclose clearly and accurately the
          nature and detail thereof, including without limitation such
          accounting information as is necessary to support the reasonableness
          of charges under this Agreement and such additional information as MCK
          may reasonably request for purposes of its internal bookkeeping and
          accounting operations. VITAL shall keep such books, records and
          accounts insofar as they pertain to the computation of charges
          hereunder available at its principal offices for audit, inspection and
          copying by MCK and persons authorized by MCK during reasonable
          business hours.

          MCK shall have the right, on two (2) occasions per each twelve (12)
          month period of this Agreement, to conduct an audit of the relevant
          books, records and accounts of VITAL upon giving reasonable notice of
          its intent to conduct such an audit. In the event of such audit, VITAL
          shall give to the party requesting the audit its cooperation and
          access to all books, records and accounts reasonably necessary to
          audit. If during the course of any such audit it is determined that
          the charges actually invoiced to MCK by VITAL are more than [***]
          percent greater than the charges which should have been invoiced
          according to such audit, then VITAL shall (1) pay to MCK the sum of
          (x) the difference between such audited invoice amount and the amount
          actually invoiced and (y) interest calculated from the data of the
          invoice and (2) reimburse MCK for all costs associated with such audit
          not to exceed the amount of the overcharge. If it is determined that
          VITAL was underpaid then MCK shall pay to VITAL the amount of the
          underpayment.

8.   TERMINATION.

          8.1 This Agreement may be terminated immediately by either party
          through written Notice under any of the following conditions:

               8.1.1 By either party if the other party breaches any of the
          material provisions of this Agreement and fails to remedy such breach
          within thirty (30) days after written notification by the other party
          of such breach.



[***]  Confidential treatment has been requested for the bracketed portions.
       The confidential redacted portion has been omitted and filed separately
       with the Securities and Exchange Commission.


                                                                              10

<PAGE>   11

               8.1.2 By VITAL if MCK fails to pay any amount when due and such
          failure continues for sixty (60) days after written notification by
          VITAL of such past due amount except for quarterly advance payments
          under Section 7.4 if such failure continues for sixty (60) days after
          the quarterly due date.

          8.2 Provisions after Termination of the Agreement.

               8.2.1 Upon termination of this Agreement (i) each party shall
          immediately return to the other all Confidential Information (as
          defined below) of the other party in its possession and (ii) VITAL
          shall return to MCK immediately after the effective date of
          termination all MCK-owned consigned spare parts

9.   SOFTWARE LICENSE AND PROPRIETARY RIGHTS.

          VITAL acknowledges that it may receive Software as a result of
          services provided under this Agreement. VITAL agrees that it is
          licensed to distribute such Software only on Product covered under the
          Services. Except as otherwise specified, VITAL shall not: (i) copy, in
          whole or in part, Software or documentation; (ii) reverse compile or
          reverse assemble all or any portion of the Software; or (iii) rent,
          lease, distribute, sell, or create derivative works of the Software.

10.  CONFIDENTIAL INFORMATION.

          10.1 As used in this Agreement, "Confidential Information" means any
          business or technical information disclosed, either written or orally,
          by one party to the other under this Agreement provided, that if the
          information disclosed is in writing, it must be clearly labeled as
          "Confidential", "proprietary" or with a similar legend, and if the
          information is disclosed orally, it must be i) identified as
          Confidential Information at the time of disclosure by the disclosing
          party.

          10.2 Confidential Information does not include any information which:

                    10.2.1 is, or subsequently becomes, legally and publicly
               known or readily ascertainable by the public, and through no
               wrongful act of the receiving party;

                    10.2.2 is rightfully obtained and received by receiving
               party from a third party without any obligation of
               confidentiality;

                    10.2.3 is independently developed by the receiving party or
               for the receiving party without access to or benefit from the
               Confidential Information; or

                    10.2.4 is disclosed to a third party by the disclosing party
               without restriction on disclosure.

          10.3 Each party agrees to hold the other party's Confidential
          Information in strict confidence and not to disclose such Confidential
          Information to any third party except as specifically authorized by
          this Agreement or by the other party in writing. Each party may
          disclose the other's Confidential Information to its employees who are
          under confidentiality obligations to it and who have a bona fide need
          to know such Confidential Information, but only to the extent
          necessary to carry out the purposes of this Agreement.

                                                                              11

<PAGE>   12

          10.4 Both parties acknowledge and agree that both parties list of
          employees is confidential and shall prevent the unauthorized
          disclosure of this Confidential Information. Each party shall use at
          least the same degree of care to protect such information as it uses
          to protect its own confidential or proprietary information of a
          similar nature but in no event less than reasonable care. Each party
          shall use such information solely for the purposes contained in this
          Agreement, and shall make no other use of such information.

          10.5 All Confidential Information disclosed hereunder is and shall
          remain the property of the disclosing party. No right or license is
          granted other than as expressly set forth in this Agreement. These
          Section 10 obligations shall survive the expiration or termination of
          this Agreement.

11.  MCK LIABILITY AND INDEMNIFICATION.

          11.1 MCK agrees to defend and indemnify VITAL, its officers, employees
          and Affiliates from and against all claims, damages, liabilities,
          awards, judgments and settlements against them of whatever nature for
          damage to tangible personal property and bodily injury (including
          death) arising out of or resulting from the authorized use of the
          Product as provided to the Customer or VITAL by MCK in accordance with
          the terms of this Agreement.

          11.2 MCK, at its own expense, shall defend and indemnify VITAL and its
          Affiliates against claims that the authorized repair, installation and
          possession of a Product by VITAL in accordance with the terms of this
          Agreement infringes a U.S. patent or copyright or misappropriates
          trade secrets of a third party provided VITAL (i) gives MCK prompt
          notice of such claim, (ii) gives MCK sole control of any defense and
          settlement of such claims and (iii) provides any and all reasonably
          required assistance requested by MCK at MCK's expense.

          11.3 MCK's obligations under this Section 11 shall not extend to
          liabilities of VITAL, VITAL officers, employees, or VITAL Affiliates
          which are caused by VITAL's negligence or intentional misconduct in
          performance of its obligations under this Agreement.

          11.4 VITAL shall give MCK prompt notice of any suit or other
          proceeding against VITAL for which VITAL may wish to seek
          indemnification hereunder. In addition, the parties agree not to
          settle or compromise any claim or cause of action, which may affect an
          interest of the other party, without the prior written approval of the
          other party, providing such approval shall not be unreasonably
          withheld.

          11.5 MCK shall have full control of the defense of any claim or cause
          of action for which it is obligated to indemnify VITAL, and for all
          negotiations for its settlement or compromise. VITAL shall reasonably
          cooperate with MCK, at MCK's expense, in the defense of the action.

          11.6 Non-Solicitation.  During the term of this Agreement and
          for one (1) year thereafter, MCK shall not, without the prior written
          consent of VITAL, directly or indirectly solicit, recruit, hire or use
          the services of any VITAL employee whose identity is learned hereunder
          so long as such employee is employed by VITAL and for sixty (60) days
          thereafter. In the event of breach of this obligation MCK shall
          promptly pay to VITAL, as liquidated damages and not as a penalty, an
          amount equal to two (2) times such employee's total annual
          compensation determined as of the date of the breach.




                                                                              12

<PAGE>   13

          11.7 IN NO EVENT SHALL MCK OR ANY MCK AFFILIATE BE LIABLE FOR ANY
          SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, LOST PROFITS, OR LOST
          DATA, OR ANY OTHER INDIRECT DAMAGES EVEN IF MCK HAS BEEN INFORMED OF
          THE POSSIBILITY THEREOF OR WHETHER SUCH EXPENSES OR DAMAGES ARE
          SUFFERED INTERNALLY BY VITAL OR ARE PAID BY VITAL TO A THIRD PARTY.

12.  VITAL LIABILITY AND INDEMNIFICATION.

          12.1 VITAL agrees to defend and indemnify MCK and its directors,
          stockholders, officers and employees from and against all claims,
          damages, liabilities, awards, judgments, and settlements against them
          of whatever nature for damage to tangible property and bodily injury
          (including death) arising out of VITAL's negligence, willful
          misconduct or breach with respect to the performance of its or its
          obligations under this Agreement.

          12.2 IN NO EVENT SHALL VITAL OR ANY VITAL AFFILIATE BE LIABLE FOR ANY
          SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, LOST PROFITS, OR LOST
          DATA, OR ANY OTHER INDIRECT DAMAGES EVEN IF VITAL HAS BEEN INFORMED OF
          THE POSSIBILITY THEREOF OR WHETHER SUCH EXPENSES OR DAMAGES ARE
          SUFFERED INTERNALLY BY MCK OR ARE PAID BY MCK TO A THIRD PARTY.

          12.3 VITAL's obligations under this Section shall not extend to
          liabilities of MCK and its officers and employees which arise out of
          MCK's negligence or intentional misconduct or breach of third party
          intellectual property rights in the design, manufacture, distribution,
          installation or servicing of the Product.

          12.4 MCK shall give VITAL prompt notice of any suit or other
          proceeding instituted against MCK for which MCK may wish to seek
          indemnification hereunder. The parties agree to cooperate in the
          defense of any such action or proceeding. In addition, the parties
          agree not to settle or compromise any claim or cause of action, which
          may affect an interest of the other party, without the prior written
          approval of the other party.

          12.5 THE ENTIRE CUMULATIVE LIABILITY OF EITHER PARTY's EXCLUSIVE
          REMEDY FOR DAMAGES FROM ANY CAUSE related to or arising out of this
          Agreement, its making, performance or interpretation, including claims
          of Customers related to performance of Services by VITAL, regardless
          of the form of action, whether in contract or tort and including
          negligence, shall not exceed the actual amount paid by MCK for
          Services directly related to the specific claim, during the twelve
          (12) month period immediately prior to MCK's written notice of a
          claim.

          12.6 Non-Solicitation. During the term of this Agreement and for one
          (1) year thereafter, VITAL shall not, without the prior written
          consent of MCK, directly or indirectly solicit, recruit, hire or use
          the services of any MCK employee whose identity is learned hereunder
          so long as such employee is employed by MCK and for sixty (60) days
          thereafter. In the event of breach of this obligation VITAL shall
          promptly pay to MCK, as liquidated damages and not as a penalty, an
          amount equal to two (2) times such employee's total annual
          compensation determined as of the date of the breach.

13.  INSURANCE

          13.1 VITAL shall maintain during the term of this Agreement at VITAL's
          expense, commercial general liability insurance including Property
          Damage insurance and

                                                                              13

<PAGE>   14

          Personal Injury insurance in such amounts and upon such terms which
          are reasonably satisfactory to MCK and with MCK named as an additional
          insured for purposes of this Agreement.

          13.2. Workers Compensation: VITAL will maintain Workers Compensation
          insurance to the statutory amount and Employer's Liability of at least
          $1,000,000.

14.  GENERAL

          14.1 Assignments. Neither this Agreement nor any rights under this
          Agreement, other than monies due or to become due, shall be assigned
          or otherwise transferred by either party (by operation of law or
          otherwise) without the prior written consent of the other party. This
          Agreement may be transferred or otherwise assigned to any entity which
          owns or acquires all or substantially all of the assets of either
          party or to any Affiliate with the prior written approval of the other
          party, which approval shall not be unreasonably withheld. This
          Agreement shall bind and inure to the benefit of the successors and
          permitted assigns of the parties.

          14.2 Warranty.

                    14.2.1 VITAL shall not make any warranty commitment, whether
               written or oral, on MCK' behalf.

                    14.2.2 VITAL warrants that the Services provided shall be
               performed in a competent manner by qualified, trained maintenance
               personnel and shall be free from defects in workmanship for
               thirty (30) days following its provision.

          14.3 Modifications. This Agreement may not be changed or modified in
          any way subsequent to the first date of execution except by an
          instrument in writing cosigned by authorized representatives of both
          parties. No contract or agreement entered into after the Effective
          Date shall amend by implication any provision of this Agreement.

          14.4 Severability. If any provision of this Agreement is or becomes
          illegal, invalid or void under any applicable state or federal law
          under which performance hereunder is required, such provision shall be
          considered severable, and the remaining provisions hereof shall not be
          impaired, and this Agreement shall be interpreted as far as possible
          so as to give effect to its stated purpose.

          14.5 Defined Relationship. Other than the services agreed to in this
          document, neither party is hereby designated nor appointed an agent to
          the other and neither party shall have any authority, either express
          or implied, to create or assume any agency or obligation on behalf of
          or in the name of the other. The relationship of VITAL and MCK shall
          be that of independent contractors and, except as expressly set forth
          herein, neither party shall have any responsibility for or obligations
          to the employees of the other.

          14.6 Disclosure of Agreement. VITAL acknowledges and agrees that in no
          event shall any of the information contained in this Agreement be
          disclosed to anyone other than VITAL's employees with a need to know.
          Neither party shall disclose, advertise, or publish the terms and
          conditions of or transactions under this Agreement without the prior
          written consent of the other party, which will not be unreasonably
          withheld.

          14.7 Trademarks. Neither VITAL or MCK will use each other's trademark
          or trade name in any manner except as mutually agreed upon. Neither
          VITAL or MCK have any right, title or interest in each other's
          trademark or trade name. Both parties agree to allow

                                                                              14

<PAGE>   15

          the other party to use their name and logo on the other parties
          respective web site upon such terms and conditions as the parties
          hereto may agree upon.

          14.8 Force Majeure. Neither party shall be deemed to be in default nor
          be responsible for delays or failures in performance resulting from
          acts beyond the reasonable control of such party. Such acts shall
          include, but not be limited to, acts of God, strikes, lockouts, riots,
          acts of war, epidemics, governmental action or inaction, trade
          embargoes, fire, communication line failures, power failures,
          earthquakes, or other disasters.

          14.9 Notices. Any Notices required or authorized to be given shall be
          deemed to have been given when received via certified or registered
          first-class mail, postage prepaid, or via any other public or private
          delivery service providing for written acknowledgment of receipt to
          the address set forth on the signature page of this Agreement.

          14.10 Waiver. No delay, failure or refusal on behalf of either party
          to require or demand any performance or obligation hereunder, or to
          exercise any right or remedy to which it may be or become entitled,
          shall constitute or be deemed a waiver or relinquishment thereof, or
          of any other right, demand or obligation, and shall not prejudice
          either party's right to demand or insist upon any other prior or
          subsequent performance or obligation hereunder.

          14.11 Disputes and Governing Law. The rights and obligations of the
          parties and all interpretations and performance of this Agreement
          shall be governed in all respects by the laws of the Commonwealth of
          Massachusetts except for its rules with respect to the conflict of
          laws.

          14.12 Paragraph Headings. Paragraph headings contained in this
          Agreement are for ease of reference only and shall not affect the
          interpretation or meaning of this Agreement.

          14.13 Integration. This agreement, including the attached Exhibits,
          and any amendments as may from time to time be agreed and integrated
          is intended to be the sole and complete statement of the obligations
          of the parties and supersedes any other negotiation, agreement or
          understanding, whether written or oral, that may have been made or
          entered into with regard to the subject matter hereof by MCK or VITAL
          or by any officer or other representative of either party. This
          Agreement and the performance of the parties pursuant to it shall not
          affect any other Agreement between them which relates to matters
          extraneous hereto.

          14.14 Conflicts. In the event that any specific wording of this
          Agreement shall conflict with any provision or wording of any printed
          terms and conditions contained on Purchase Orders, acceptance forms,
          procurement and functional specifications, the wording of this
          Agreement shall prevail.

          14.15 Survival. Sections 8, 10, 11 and 12, shall survive termination
          of this Agreement.

                                                                              15

<PAGE>   16

MCK COMMUNICATIONS, INC.                  VITAL NETWORK SERVICES, L.L.C.

By:        /s/ Woody Benson               By:        /s/ Philip John Woods
   ------------------------------            -------------------------------
Name:      Woody Benson                   Name:      Philip John Woods
     ----------------------------            -------------------------------
Title:      CEO                           Title:     President
     ----------------------------            -------------------------------
Address:   313 Washington Street          Address:   6 Rubber Avenue
           Newton, Ma 02458                          Naugatuck, Ct 06770

Date:      6/28/99                        Date:      6/29/99
     ----------------------------            -------------------------------




                                                                              16

<PAGE>   17

                                   APPENDIXES

Appendix A:  MCK Product List (Accelerated to provide Hard/Soft version)

Appendix B:  VITAL Payment Schedule/Minimum Commitments (provided in prior
             e-mail)

Appendix C:  MCK Escalation/Priority Schedule- TBD

Appendix D:  MCK Support Services - TBD

Appendix F:  VITAL Installation & Maintenance Service Descriptions

                                                                              17

<PAGE>   18

                          APPENDIX A: MCK PRODUCT LIST

<TABLE>
<CAPTION>

                                                        SWITCH UNIT                            REMOTE UNIT

 <S>                                                   <C>                                     <C>
 Branch Office EXTender 6000                           E-6000-SLM08                            E-6000-RLM08
 (Definity Compatible)

 Branch Office EXTender 6000                           E-6000-SNM08                            E-6000-RNM08
 (Meridian/Norstar Compatible)
 Branch Office EXTender 6000                           E-6000-SEM08                            E-6000-REM08

 (Neax Compatible)

</TABLE>

                                                                              18

<PAGE>   19


[VITAL NETWORK LOGO]



                 APPENDIX B - REVENUE SPLITS & PRICING SCHEDULE

NOTE: VITAL NETWORK SERVICES CHARGES MCK THE PERCENTAGE OF END-USER LIST PRICE
OR FLAT RATE AS INDICATED.

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
                           TOLL FREE/ HELP DESK                                                           CHARGE TO MCK
- --------------------------------------------------------------------------------------------------------------------------
<S>            <C>                                                     <C>                 <C>              <C>
I.             8 X 5 HELP DESK                                                                              [***] (annual)
               24 X 7 HELP DESK                                                                             [***] (annual)
               (OPTIONAL - DOES NOT INCLUDE COST OF LINE)
- --------------------------------------------------------------------------------------------------------------------------


- --------------------------------------------------------------------------------------------------------------------------
   SECTION                 SERVICE DESCRIPTION                                                            CHARGE TO MCK
- --------------------------------------------------------------------------------------------------------------------------
I.             LOGISTICS MANAGEMENT
               NON MAINTENANCE CUSTOMERS

                                PRICE PER STOCKING LOCATION                                                  [***]
- --------------------------------------------------------------------------------------------------------------------------
   SECTION                 SERVICE DESCRIPTION                   END USER PRICE             MCK               VITAL
                                                               (% OF PRODUCT LIST)
- --------------------------------------------------------------------------------------------------------------------------
II.            HARDWARE INSTALLATION SERVICES
               (PRICING REFLECTS ZONE A & B ONLY)
                                    BUSINESS DAY (1ST UNIT)            TBD                  [***]            [***]
                                          ADDITIONAL UNITS*            TBD
                                NON BUSINESS DAY (1ST UNIT)            TBD
                                          ADDITIONAL UNITS*            TBD

                                SITE SURVEY **(PER REQUEST)

               *ADDITIONAL UNIT PRICING APPLIES IF
               INSTALLED AT THE SAME SITE. MINIMUM
               INSTALLATION CHARGE IN $[***].
               **FEE IS WAIVED IF INSTALLATION IS                                                            [***]
               PURCHASED AT TIME OF SITE SURVEY REQUEST
- --------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------
III.           SOFTWARE INSTALLATION (ON-SITE) SERVICES
               LOAD S/W, CONFIGURE & TEST

                                               BUSINESS DAY             [***]              [***]             [***]
                                           NON BUSINESS DAY             [***]              [***]             [***]
- --------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------
IV.            REMOTE SERVICES

                    TS/SOFTWARERELEASE (NO LABOR) /ADVANCED             [***]              [***]             [***]
                                                REPLACEMENT
- --------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------
V.             MAINTENANCE SERVICES
               (PRICING REFLECT ZONE A & B ONLY)
                                          BASIC 8 X 5 (M-F)             [***]              [***]             [***]
                             PREMIUM 7 X 24 (PENDING AVAIL)
               ALL MAINTENANCE SERVICES LISTED ABOVE CARRY              [***]
               FOUR (4) HOUR RESPONSE FROM ZONE A
               LOCATIONS TO THE END-USER, LOGISTICS
               MANAGEMENT INCLUDED.

               MCK IS RESPONSIBLE FOR CONSIGNMENT OF
               SPARING.

- --------------------------------------------------------------------------------------------------------------------------
   SECTION                 SERVICE DESCRIPTION                      END USER                MCK               VITAL
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>


                                                                              19
[***]  Confidential treatment has been requested for the bracketed portions.
       The confidential redacted portion has been omitted and filed separately
       with the Securities and Exchange Commission.
<PAGE>   20


<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
VI.            DEDICATED FIELD ENGINEER
               ONE (1) YEAR (40 HOURS PER WEEK)*                     [***]              [***]             [***]
                *PRICE BASED ON LEVEL OF ENGINEER REQUIRED
- --------------------------------------------------------------------------------------------------------------------------
                                                                      ZONES             TO END USER        TO END USER
- --------------------------------------------------------------------------------------------------------------------------
<S>            <C>                                                   <C>               <C>               <C>
VII.           TIME AND MATERIAL SERVICES  (TO END USER)                               TRAVEL (FIXED     LABOR(PER HOUR)
               (CONTRACT CUSTOMERS OUTSIDE SCOPE OF                                        RATE)
               CONTRACT)

                                                                     ZONE A                                  [***]
                                                                     ZONE B                [***]
                                              BUSINESS DAY*          ZONE C                [***]
                                                                                           [***]
                                                                     ZONE A                                  [***]
                                                                     ZONE B                [***]
                                           NON BUSINESS DAY          ZONE C                [***]
                                                                                           [***]
                                                                                                             [***]
                                        HOLIDAYS & WEEKENDS
                                                                                           [***]


               NON- CONTRACT CUSTOMER RATES
                                                                     ZONE A                                  [***]
                                                                     ZONE B                [***]
                                               BUSINESS DAY          ZONE C                [***]
                                                                                           [***]
                                                                     ZONE A                                  [***]
                                                                     ZONE B                [***]
                                           NON BUSINESS DAY          ZONE C                [***]
                                                                                                             [***]
                                        HOLIDAYS & WEEKENDS                                [***]


               ZONE A =  50 MILE RADIUS OF VITAL SERVICE
               CENTER
               ZONE B=51-100 MILE RADIUS OF VITAL SERVICE
               CENTER
               ZONE C=100+ RADIUS OF VITAL SERVICE CENTER

               *ALL TYPE CALLS CARRY A [***]
               MINIMUM EXCEPT WHERE SPECIFIED
- --------------------------------------------------------------------------------------------------------------------------
                                                                 DISCOUNT TO MCK        LIST PRICES           NOTE:
- --------------------------------------------------------------------------------------------------------------------------
VIII.          BLOCK OF HOURS (TO MCK)
               -        TIME & MATERIAL                               [***]               [***]               [***]
               -        PROJECT MANAGEMENT                                                [***]               [***]
               -        PROFESSIONAL SERVICES                                             [***]
               -        CUSTOMER SERVICE                                                  [***]               [***]
               -        OTHER                                                             [***]
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>



[***]  Confidential treatment has been requested for the bracketed portions.
       The confidential redacted portion has been omitted and filed separately
       with the Securities and Exchange Commission.



                                                                              20
<PAGE>   21


<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
                                                                    END USER                MCK               VITAL
- --------------------------------------------------------------------------------------------------------------------------
<S>            <C>                                            <C>                           <C>                <C>
IX.            PROFESSIONAL SERVICES/ PROJECT MANAGEMENT      CUSTOM QUOTE REQUIRED         [***]              [***]
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>



[***]  Confidential treatment has been requested for the bracketed portions.
       The confidential redacted portion has been omitted and filed separately
       with the Securities and Exchange Commission.



                                                                              21
<PAGE>   22


<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
   SECTION                       SERVICE DESCRIPTION                               MCK                   CHARGE TO MCK
- --------------------------------------------------------------------------------------------------------------------------
<S>            <C>                                                           <C>                        <C>
X.             TECHNOLOGY TRAINING

                                    TRAIN THE TRAINER (PROVIDED BY MCK)      [***]                       [***]

                              INITIAL CONSULTATION/COURSE INVESTIGATION      ----------------->          [***]

                                                    COURSE DEVELOPMENT*      ----------------->          [***]

                                          COURSE OFFERING IN NAUGATUCK#
                                                                             ----------------->          [***]

                           COURSE OFFERING ON CUSTOMER OR MCK PREMISES*                                  [***]
                                                                             ----------------->


                 *TRAVEL & EXPENSES, SHIPPING WILL BE CHARGED AT ACTUAL
                                  COSTS. SET UP WILL BE BILLED AT [***]

              #DEPENDENT ON SUBJECT- PLAN FOR 3-5 DAY COURSE OFFERINGS.
                           MINIMUM REQUIREMENT, (4) STUDENTS PER CLASS.

               (1) BUDGETARY ONLY-EACH PROJECT TO BE REVIEWED ON MERIT.



- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

[***] Confidential treatment has been requested for the bracketed portions. The
      confidential redacted portion has been omitted and filed separately with
      the Securities and Exchange Commission.

                                                                              22
<PAGE>   23


                          VITAL NETWORK SERVICES / MCK
                  START UP FEES, CONDITIONS & PAYMENT SCHEDULES

Contract Commencement is JULY 1, 1999. The initial contract term is TWENTY-FOUR
(24) MONTHS.

PAYMENT SCHEDULE (1999-2001)


<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
                          YEAR 1                                                         YEAR 2
             (PAYMENT IS QUARTERLY IN ARREARS)                    (PAYMENT IS QUARTERLY FOR ACTUAL SERVICES RENDERED)
- --------------------------------------------------------------------------------------------------------------------------
<S>          <C>                       <C>          <C>          <C>                <C>                            <C>
QTR 1        July, Aug, SEPT           1999          30K          QTR 1
- --------------------------------------------------------------------------------------------------------------------------
QTR 2        Oct, Nov, DEC             1999          50K          QTR 2
- --------------------------------------------------------------------------------------------------------------------------
QTR 3        Jan, Feb, MAR             2000          75K          QTR 3
- --------------------------------------------------------------------------------------------------------------------------
QTR 4        Apr, May, JUN             2000          95K          QTR 4
- --------------------------------------------------------------------------------------------------------------------------
                                                                                    July 2000- June 2001
- --------------------------------------------------------------------------------------------------------------------------
                                             Total  250K                                         12 Month Target   200K
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>


CONDITIONS:

1.   MCK MINIMUM COMMITMENT TO VITAL NETWORK SERVICES IS 250K IN YEAR 1 AND
     200K IN YEAR 2.
2.   PRICING WILL BE REVIEWED EVERY SIX (6) MONTHS AND IS SUBJECT TO CHANGE UPON
     MUTUAL AGREEMENT.
3.   IF ACTUAL REVENUE EXCEEDS QUARTERLY TARGETS IN YEAR 1, THE NEXT QUARTERS
     INVOICE WILL BE ADJUSTED ACCORDINGLY. THE GOAL FOR THE FIRST TWELVE (12)
     MONTH PERIOD IS TO EQUAL OR EXCEED 250K. IN YEAR 2, PAYMENT WILL BE
     QUARTERLY IN ARREARS FOR ACTUAL SERVICES RENDERED. IF THERE IS A SHORTFALL
     OF THE TWELVE (12) MONTH TARGET, THE FINAL BILLING WILL INCLUDE THE
     SHORTFALL AMOUNT.
4.   REVENUE MINIMUM'S ONLY APPLY TOWARDS SERVICES HIGHLIGHTED IN SECTIONS I
     (A&B), II, III, IV, VIII AND IX ONLY.
5.   IF REVENUE MEETS OR EXCEEDS THE TOTAL TWENTY-FOUR (24) MONTH COMMITMENT OF
     450K ANYTIME DURING THE CONTRACT TERM, MCK HAS MET THEIR REVENUE MINIMUMS
     TO VITAL NETWORK SERVICES.

[***] Confidential treatment has been requested for the bracketed portions. The
      confidential redacted portion has been omitted and filed separately with
      the Securities and Exchange Commission.

                                                                              23


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