PERIPHONICS CORP
8-K, 1999-08-27
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549



                                    FORM 8-K

                                 CURRENT REPORT


                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934


                                 August 24, 1999
                Date of Report (Date of earliest event reported)


                             PERIPHONICS CORPORATION
             (Exact name of Registrant as specified in its charter)


        Delaware                     0-25592                   11-2699509
(State or other jurisdiction  (Commission File Number)       (IRS Employer
    of incorporation)                                    Identification Number)



                         4000 Veterans Memorial Highway
                                Bohemia, NY 11716


                                 (516) 468-9000
              (Registrant's telephone number, including area code)


                                Page 1 of 4 Pages
                         Exhibit Index Appears at Page 4


<PAGE>


     Item 5. Other Events

     On  August  24,  1999,  Periphonics  Corporation,  a  Delaware  corporation
("Periphonics"),  and Nortel Networks Corporation, a corporation organized under
the laws of Canada ("Nortel"),  entered into a definitive  agreement and plan of
merger  (the  "Merger  Agreement"),   pursuant  to  which  Nortel,  through  its
wholly-owned subsidiary North Subsidiary,  Inc. ("North"),  will acquire 100% of
the voting  securities of  Periphonics  for an estimated  US$436  million common
shares of Nortel.  The Merger  Agreement  provides that Nortel can elect between
two  alternative  means of  effecting  the merger,  either (i) a reverse  merger
whereby North will merge with and into  Periphonics  so that  Periphonics is the
surviving corporation,  wholly-owned by Nortel; or (ii) a forward merger whereby
Periphonics  will merge  with and into  North,  so that  North is the  surviving
corporation, wholly-owned by Nortel.

     In  connection  with the  execution  of the Merger  Agreement,  the parties
entered into a Stock Option  Agreement,  dated as of August 24, 1999 (the "Stock
Option Agreement") pursuant to which and subject to the terms and conditions set
forth  therein,  Periphonics  granted  to Nortel an  option  to  purchase  up to
approximately 19.9% of the outstanding voting shares of Periphonics in the event
that  the  merger  contemplated  in the  Merger  Agreement  is not  consummated.
Additionally,  Nortel  and  certain  executives  of  Periphonics,  who are  also
shareholders of Periphonics,  have entered into a Stockholders Agreement,  dated
as of August 24, 1999 (the "Stockholders Agreement") whereby, and subject to the
terms and conditions set forth therein,  the executives  have provided  Nortel a
proxy,  representing  approximately  13.5% of the  total  outstanding  shares of
Periphonics on an undiluted  basis,  to vote for all matters in connection  with
the  transaction   contemplated  by  the  Merger  Agreement   presented  at  the
Periphonics' shareholders meeting.

     Pursuant to the Merger  Agreement  and subject to the terms and  conditions
set forth therein,  each share of Periphonics  will be converted into a fraction
of a Nortel share at a exchange  ratio equal to US$29.23  divided by the average
price of a Nortel  share  during a specified  period  prior to closing.  In this
specified period, if the average price of a Nortel share is above US$47.15,  the
exchange  ratio will be fixed at 0.62 and if the  average  share  price is below
US$38.46,  the exchange  ratio will be fixed at 0.76. The boards of directors of
the two companies have approved the transaction.

     The  closing  of the  transaction  is  subject  to a  number  of  customary
conditions,  including  approval of the  shareholders of  Periphonics,  approval
under the Hart-Scott-Rodino  Antitrust Improvements Act of 1976, as amended, and
certain other regulatory  filings and approvals.  The transaction is intended to
be tax-free to the shareholders of Periphonics.

     Copies  of the  Merger  Agreement,  Stock  Option  Agreement,  Stockholders
Agreement and the joint press release are attached hereto as Exhibits 2.1, 99.1,
99.2 and 99.3 respectively.  The foregoing  description of the Merger Agreement,
Stock  Option  Agreement  and  Stockholders  Agreement  are  qualified  in their
entirety by reference to the full text of such exhibits.  The Merger  Agreement,
Stock Option Agreement,  Stockholders Agreement and the press release are hereby
incorporated by reference.

     Item 7. Financial Statements, Pro Forma Financial Statements and Exhibits

     (c) Exhibits:

          Exhibit No.        Description

          2.1                Agreement and Plan of Merger by
                             and among Nortel Networks Corporation,
                             North Subsidiary, Inc. and Periphonics
                             Corporation dated as of August 24, 1999.

          99.1               Stock Option Agreement dated as of August
                             24, 1999 between Nortel Networks Corporation
                             and Periphonics Corporation.

          99.2               Stockholders Agreement dated as of August
                             24, 1999 among Peter J. Cohen, George W.
                             Cole, Richard A. Daniels, Kevin J. O'Brien,
                             Jayandra Patel and Nortel Networks Corporation.

          99.3               Joint Press Release issued by Nortel Networks
                             Corporation   and   Periphonics
                             Corporation on August 24, 1999.



                                   SIGNATURES

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                               PERIPHONICS CORPORATION

Date:  August 26, 1999

                               By: /s/
                                   -------------------------
                                   Name:  Peter J. Cohen
                                   Title:  President and Chief Executive Officer


<PAGE>



                                  EXHIBIT INDEX

          Exhibit No.            Description

          2.1                    Agreement and Plan of Merger by
                                 and among Nortel Networks Corporation,
                                 North Subsidiary, Inc. and Periphonics
                                 Corporation dated as of August 24, 1999.

          99.1                   Stock Option Agreement dated as of August
                                 24, 1999 between Nortel Networks Corporation
                                 and Periphonics Corporation.

          99.2                   Stockholders Agreement dated as of August
                                 24, 1999 among Peter J. Cohen, George W.
                                 Cole, Richard A. Daniels, Kevin J. O'Brien,
                                 Jayandra Patel and Nortel Networks Corporation.

          99.3                   Joint Press Release issued by Nortel Networks
                                 Corporation   and   Periphonics
                                 Corporation on August 24, 1999.











                          AGREEMENT AND PLAN OF MERGER

                                  by and among

                          NORTEL NETWORKS CORPORATION,

                             NORTH SUBSIDIARY, INC.

                                       and

                             PERIPHONICS CORPORATION


                           Dated as of August 24, 1999





<PAGE>




<TABLE>
<CAPTION>

                                TABLE OF CONTENTS

                                                                                                               Page



<S>                                                                                                              <C>
    ARTICLE I   CERTAIN DEFINITIONS...............................................................................1


   1.01.  Certain Definitions.....................................................................................1

    ARTICLE II   THE MERGER; EFFECTS OF THE MERGER................................................................8


   2.01.  The Merger..............................................................................................8

   2.02.  Effective Date and Effective Time.......................................................................9

   2.03.  Tax Consequences........................................................................................9

    ARTICLE III   CONVERSION OF SHARES; EXCHANGE PROCEDURES.......................................................9


   3.01.  Conversion of Shares....................................................................................9

   3.02.  Issuance of Shares of the Surviving Corporation........................................................10

   3.03.  Rights as Stockholders; Stock Transfers................................................................10

   3.04.  Fractional Shares......................................................................................10

   3.05.  Exchange Procedures....................................................................................10

   3.06.  Anti-Dilution Provisions...............................................................................11

   3.07. Stock Options and Other Stock Plans.....................................................................12

    ARTICLE IV   ACTIONS PENDING MERGER..........................................................................13


   4.01.  Forbearances of the Company............................................................................13

   4.02.  Forbearances of Parent.................................................................................16

    ARTICLE V   REPRESENTATIONS AND WARRANTIES...................................................................16


    5.01.  Representations and Warranties of the Company.........................................................16


    5.02.  Representations and Warranties of Parent and Sub......................................................29


    ARTICLE VI   COVENANTS.......................................................................................33


   6.01.  Reasonable Best Efforts................................................................................33

   6.02.  Stockholder Approvals..................................................................................34

   6.03.  Registration Statement.................................................................................34

   6.04.  Press Releases.........................................................................................35

   6.05.  Access; Information....................................................................................35

   6.06.  Acquisition Proposals..................................................................................36

   6.07.  Affiliate Agreements...................................................................................37

   6.08.  Takeover Laws..........................................................................................37

   6.09.  The Company Rights Agreement...........................................................................37

   6.10.  Shares Listed..........................................................................................38

   6.11.  Regulatory Applications................................................................................38

   6.12.  Indemnification........................................................................................39

   6.13.  Certain Employee Benefit Matters.......................................................................40

   6.14.  Accountants'Letters....................................................................................41

   6.15.  Notification of Certain Matters........................................................................41

   6.16. Certain Tax Matters.....................................................................................41

   6.17. Agreements with Respect to Assumption of Company Stock Options..........................................42

    ARTICLE VII   CONDITIONS TO CONSUMMATION OF THE MERGER.......................................................42


   7.01.  Conditions to Each Party's Obligation to Effect the Merger.............................................42

   7.02.  Conditions to Obligation of the Company................................................................43

   7.03.  Conditions to Obligation of Parent and Sub.............................................................44

    ARTICLE VIII   TERMINATION...................................................................................45


   8.01.  Termination............................................................................................45

   8.02.  Effect of Termination and Abandonment..................................................................47

    ARTICLE IX   MISCELLANEOUS...................................................................................49


   9.01.  Survival...............................................................................................49

   9.02.  Amendment; Extension; Waiver...........................................................................49

   9.03.  Counterparts...........................................................................................49

   9.04.  Governing Law..........................................................................................49

   9.05.  Expenses...............................................................................................49

   9.06.  Notices................................................................................................49

   9.07.  Entire Understanding...................................................................................51

   9.08.  Assignment; No Third Party Beneficiaries...............................................................51

   9.09.  Interpretation.........................................................................................51

   9.10.  Severability...........................................................................................51

   9.11. Pre-Termination Equitable Remedies......................................................................51

     Exhibit A ...Form of Affiliate Letter

</TABLE>

<PAGE>


     AGREEMENT  AND  PLAN  OF  MERGER,   dated  as  of  August  24,  1999  (this
"Agreement"),  by and among NORTEL NETWORKS CORPORATION, a corporation organized
under the laws of Canada  ("Nortel"),  NORTH  SUBSIDIARY,  INC.,  a  corporation
organized under the laws of Delaware  ("Sub"),  and PERIPHONICS  CORPORATION,  a
corporation organized under the laws of Delaware (the "Company").

                                   WITNESSETH:

     WHEREAS,  the Boards of  Directors  of each of Nortel,  Sub and the Company
have  determined  that  it is  advisable  and in the  best  interests  of  their
respective companies and their stockholders to consummate the strategic business
combination  transaction  provided for herein in which, subject to the terms and
conditions set forth herein,  (x) Sub will merge (the "Reverse Merger") with and
into the Company, so that the Company is the surviving corporation in the Merger
or (y) if Nortel so elects,  the Company will merge (the "Forward  Merger") with
and into Sub, so that Sub is the surviving corporation in the Merger;

     WHEREAS, the parties intend that for U.S. federal income tax purposes,  the
Reverse  Merger or the  Forward  Merger  (either,  the  "Merger")  qualify  as a
"reorganization";

     WHEREAS, as a condition and an inducement to Nortel's  willingness to enter
into this Agreement,  Nortel and the Company are simultaneously  entering into a
Stock Option Agreement (the "Option  Agreement"),  pursuant to which the Company
is granting Nortel an option exercisable upon the occurrence of certain events;

     WHEREAS,  as a condition and as an inducement  to Nortel's  willingness  to
enter  into  this   Agreement,   Nortel  is  entering  into  an  agreement  (the
"Stockholders'  Agreement") with certain substantial  Company  stockholders (the
"Specified Stockholders"); and

     WHEREAS, the parties desire to make certain representations, warranties and
agreements  in  connection  with  the  Merger  and  also  to  prescribe  certain
conditions to the Merger.

     NOW, THEREFORE, in consideration of the mutual representations, warranties,
covenants and  agreements  contained  herein,  and intending to be legally bound
hereby, the parties agree as follows:

                                    ARTICLE I

                               CERTAIN DEFINITIONS

     1.01. Certain Definitions.  As used in this Agreement,  the following terms
shall have the meanings set forth below:

     "Acquisition  Proposal"  shall mean (a) a merger or  consolidation,  or any
similar transaction,  involving the Company (other than mergers,  consolidations
or  similar  transactions  involving  solely  the  Company  and/or  one or  more
wholly-owned  Subsidiaries of the Company),  (b) a purchase or other acquisition
(including by way of merger,  consolidation,  share exchange, tender or exchange
offer  involving  any  Subsidiary  of the  Company or  securities  issued by any
Subsidiary  of the  Company,  as the  case  may be) of  greater  than 20% of the
consolidated assets of the Company and its Subsidiaries (other than transactions
involving the sale of inventory in the ordinary  course of business,  consistent
with past practice),  (c) a purchase or other  acquisition  (including by way of
merger, consolidation, share exchange, tender or exchange offer or otherwise) of
beneficial  ownership  of  securities  representing  more than 20% of the voting
power of the Company,  (d) any  substantially  similar  transaction,  or (e) any
inquiry or indication of interest with respect to any of the foregoing;  in each
case other than the  transactions  contemplated by this Agreement and the Option
Agreement.

     "Agreement" shall have the meaning set forth in the first paragraph of this
Agreement.

     "Average  Nortel  Trading  Price"  shall mean the average of the last sales
prices per share of Nortel Common Shares on the NYSE  Composite  Tape for the 10
consecutive  trading  days ending on the  trading day which is two trading  days
prior to the Effective Date.

     "Business Day" shall mean each day on which banking institutions in both of
Toronto, Canada and New York, New York are not authorized or required to close.

     "Canadian  GAAP"  shall  mean  Canadian   generally   accepted   accounting
principles.

     "Canadian  Stock  Exchanges"  shall mean the  Toronto  and  Montreal  stock
exchanges.

     "Capitalization   Date"  shall  have  the  meaning  set  forth  in  Section
5.01(b)(i).

     "Code" shall mean the U.S. Internal Revenue Code of 1986, as amended.

     "Company"  shall have the meaning set forth in the first  paragraph of this
Agreement.

     "Company Affiliate" shall have the meaning set forth in Section 6.07(a).

     "Company Board" shall mean the Board of Directors of the Company.

     "Company  Certificate" shall mean the Restated Certificate of Incorporation
of the Company, as amended.

     "Company Common Stock" shall have the meaning set forth in Section 3.01(b).

     "Company  Disclosure  Schedule"  shall  have the  meaning  set forth in the
opening paragraph of Section 5.01.

     "Company Employee" shall have the meaning set forth in Section 6.13(a).

     "Company  Equity  Interests"  shall have the  meaning  set forth in Section
5.01(b).

     "Company Filed SEC  Documents"  shall have the meaning set forth in Section
5.01(g).

     "Company  Financial  Advisor"  shall have the  meaning set forth in Section
5.01(k).

     "Company  Intellectual Property Rights" shall have the meaning set forth in
Section 5.01(p).

     "Company Meeting" shall have the meaning set forth in Section 6.02.

     "Company  Plan" shall mean any Plan entered  into or currently  maintained,
sponsored,  or  contributed to by the Company or any of its  Subsidiaries  or to
which the Company or any such  Subsidiary  has any  obligation  to contribute or
with  respect  to which  the  Company  or any of its  Subsidiaries  may have any
material liability.

     "Company  Preferred  Stock"  shall  have the  meaning  set forth in Section
5.01(b).

     "Company  Proxy  Statement"  shall  have the  meaning  set forth in Section
6.03(a).

     "Company  Rights  Agreement"  shall have the  meaning  set forth in Section
5.01(b).

     "Company  SEC  Documents"  shall  have the  meaning  set  forth in  Section
5.01(g).

     "Company  Series A  Preferred  Stock"  shall have the  meaning set forth in
Section 5.01(g).

     "Company  Stock  Option  Plans" shall have the meaning set forth in Section
3.07(a).

     "Company  Stock  Options"  shall  have the  meaning  set  forth in  Section
3.07(a).

     "Company  Stock  Purchase Plan" shall have the meaning set forth in Section
3.07(d).

     "Company Stockholder Protection Rights" shall have the meaning set forth in
Section 5.01(b).

     "Confidentiality   Agreement"  shall  mean  that  certain   confidentiality
agreement,  dated  October 27, 1998, by and between the Company and an affiliate
of Nortel, as amended by a letter agreement dated June 24, 1999.

     "Copyrights"  shall  have  the  meaning  set  forth  in the  definition  of
Intellectual Property Rights.

     "Costs" shall have the meaning set forth in Section 6.12(a).

     "DGCL" shall mean the General Corporation Law of the State of Delaware.

     "Draft 1999 10-K" shall have the meaning set forth in Section 5.01(g)(iv).

     "Effective Date" shall have the meaning set forth in Section 2.02.

     "Effective Time" shall have the meaning set forth in Section 2.02.

     "Environmental Laws" shall have the meaning set forth in Section 5.01(o).

     "ERISA"  shall mean the U.S.  Employee  Retirement  Income  Security Act of
1974,  as amended,  and the  regulations  promulgated  thereunder  and published
interpretations of any Governmental Authority with respect thereto.

     "Exchange  Act" shall mean the U.S.  Securities  Exchange  Act of 1934,  as
amended, and the rules and regulations promulgated thereunder.

     "Exchange Agent" shall have the meaning set forth in Section 3.05(a).

     "Exchange Fund" shall have the meaning set forth in Section 3.05(a).

     "Exchange Ratio" shall mean the fraction obtained by dividing $29.23 by the
Average Nortel  Trading Price and rounding the result to the nearest  hundredth;
provided,  however,  that if such  fraction is less than 0.62 then the  Exchange
Ratio shall be 0.62,  and if such  fraction is more than 0.76 then the  Exchange
Ratio shall be 0.76; and provided, further, that the Exchange Ratio shall in any
case be subject to adjustment as set forth in Section 3.06.

     "Exon-Florio" shall have the meaning set forth in Section 5.01(r).

     "Forward  Merger"  shall have the meaning set forth in the recitals to this
Agreement.

     "Governmental   Authority"  means  any  court,   administrative  agency  or
commission  or other  foreign or domestic  federal,  state,  provincial or local
governmental authority or instrumentality.

     "HSR Act" shall have the meaning set forth in Section 5.01(r).

     "Indemnified Party" shall have the meaning set forth in Section 6.12(a).

     "Insurance Amount" shall have the meaning set forth in Section 6.12(b).

     "Intellectual  Property  Rights"  shall mean all  proprietary,  license and
other rights in and to: (A) trademarks, service marks, brand names, trade dress,
trade names,  words,  symbols,  color  schemes and other  indications  of origin
("Trademarks");   (B)  patents,  patent  applications   (together,   "Patents"),
inventors'  certificates and invention disclosures;  (C) trade secrets and other
confidential or non-public  business  information,  including  ideas,  formulas,
compositions,   discoveries  and  improvements,   know-how,   manufacturing  and
production processes and techniques,  and research and development  information;
drawings,  specifications,  plans,  proposals  and  technical  data;  analytical
models,  investment  and lending  strategies  and records,  financial  and other
products; financial,  marketing and business data, pricing and cost information;
business and marketing plans and customer and supplier lists and information; in
each case  whether  patentable,  copyrightable  or not  ("Trade  Secrets");  (D)
computer programs and databases, in each case whether patentable,  copyrightable
or not (collectively,  "Software"), and all documentation therefor; (E) writings
and  other  works  of  authorship,  including  marketing  materials,  brochures,
training materials, including all copyrights and moral rights related to each of
the  foregoing  ("Copyrights");  (F) mask works;  (G) rights to limit the use or
disclosure of confidential  information by any Person; (H) registrations of, and
applications to register,  any of the foregoing with any Governmental  Authority
and any renewals or extensions thereof; (I) the goodwill associated with each of
the foregoing;  and (J) any claims or causes of action arising out of or related
to any infringement or misappropriation of any of the foregoing; in each case in
any jurisdiction.

     "Knowledge"  with  respect to a party  shall mean to the  knowledge  of its
senior executive officers after reasonable inquiry.

     "Liens"  shall  mean  any  charge,  mortgage,  pledge,  security  interest,
restriction, claim, lien, or encumbrance.

     "Material Adverse Effect" shall mean with respect to any party, any change,
circumstance  or effect  that (i) is or is  reasonably  likely to be  materially
adverse  to the  business,  condition  (financial  or  otherwise)  or results of
operations of such party and its Subsidiaries  taken as a whole,  other than any
change, circumstance or effect that results from or arises out of (a) changes in
the economy in general or (b) changes or circumstances  affecting the industries
in which such party operates, which change,  circumstance or effect (in the case
of clause  (b)) does not  affect  the  Company  or  Nortel,  as the case may be,
disproportionately  relative  to  other  entities  operating  in such  industry;
provided, that any change, circumstance or effect that arises directly out of or
results  directly from the announcement of this Agreement shall not by itself be
deemed to constitute a Material Adverse Effect;  or (ii) would materially impair
the  ability of either  Nortel or the  Company,  respectively,  to  perform  its
obligations under this Agreement.

     "Material   Suppliers"   shall  have  the  meaning  set  forth  in  Section
5.01(t)(ii).

     "Material  Systems"  shall mean,  with respect to any person,  all internal
computer systems,  communications  systems,  embedded  manufacturing systems and
facilities  infrastructure  systems that are material to the business,  finances
and operations of such person.

     "Merger"  shall  have  the  meaning  set  forth  in the  recitals  to  this
Agreement.

     "Merger Consideration" shall have the meaning set forth in Section 2.01(a).

     "NASD" shall mean the National Association of Securities Dealers,  Inc. or,
if the context so requires, the Nasdaq Stock Market, Inc.

     "New Certificates" shall have the meaning set forth in Section 3.05(a).

     "Nortel"  shall have the meaning set forth in the first  paragraph  of this
Agreement.

     "Nortel Board" shall mean the Board of Directors of Nortel.

     "Nortel   Certificate"   shall  mean  the   Certificate   and  Articles  of
Amalgamation  of Nortel dated  January 4, 1982,  as amended from time to time by
the Certificates and Articles of Amendment of Nortel.

     "Nortel Common Shares" shall have the meaning set forth in Section 3.01(a).

     "Nortel  Disclosure  Schedule"  shall  have the  meaning  set  forth in the
opening paragraph of Section 5.02.

     "Nortel SEC Documents" shall have the meaning set forth in Section 5.02(f).

     "NYSE" shall mean the New York Stock Exchange, Inc.

     "Old Certificates" shall have the meaning set forth in Section 3.05(a).

     "Option Agreement" shall have the meaning set forth in the recitals hereof.

     "Patents"   shall  have  the  meaning  set  forth  in  the   definition  of
Intellectual Property Rights.

     "Person" or "person" shall mean any individual, bank, corporation,  limited
liability company, partnership, association, joint-stock company, business trust
or unincorporated organization.

     "Plan"  shall mean any  "employee  benefit  plan",  within  the  meaning of
Section  3(3) of ERISA,  whether or not  subject to ERISA,  and any  employment,
consulting,  termination,  severance,  retention, change in control, deferred or
incentive  compensation,  stock option or other equity based,  vacation or other
fringe benefit plan, program, policy, arrangement, agreement or commitment.

     "Previously  Disclosed" by a party shall mean information  disclosed in its
SEC  Documents  filed  prior to the date of this  Agreement  or set forth in the
related section of its Disclosure  Schedule or (with respect to the Company) set
forth in the Draft 1999 10-K.

     "Registration  Statement"  shall  have the  meaning  set  forth in  Section
6.03(a).

     "Regulatory  Law" shall mean the Sherman Act, as amended,  the Clayton Act,
as amended,  the HSR Act, the Federal Trade Commission Act, as amended,  and all
other federal, state and foreign, if any, statutes, rules, regulations,  orders,
decrees,  administrative and judicial doctrines and other laws that are designed
or intended to  prohibit,  restrict  or regulate  actions  having the purpose or
effect of  monopolization  or restraint  of trade or  lessening  of  competition
through merger or acquisition.

     "Rights" shall mean, with respect to any person,  securities or obligations
convertible  into or exercisable or  exchangeable  for, or giving any person any
right to subscribe for or acquire, or any options, calls or commitments relating
to, or any stock  appreciation  right or other  instrument the value of which is
determined  in whole or in part by  reference  to the market  price or value of,
shares of capital stock of such person.

     "SEC" shall mean the United States Securities and Exchange Commission.

     "Securities Act" shall mean the Securities Act of 1933, as amended, and the
rules and regulations promulgated thereunder.

     "Severance Plan" shall have the meaning set forth in Section 6.13(a).

     "Software"   shall  have  the  meaning  set  forth  in  the  definition  of
Intellectual Property Rights.

     "Specified  Stockholders"  shall have the meaning set forth in the recitals
to this Agreement.

     "Stockholders'  Agreement" shall have the meaning set forth in the recitals
to this Agreement.

     "Sub"  shall  have the  meaning  set forth in the first  paragraph  of this
Agreement.

     "Sub Common Stock" shall have the meaning set forth in Section 3.01(a).

     "Subsidiary" and "Significant  Subsidiary" shall have the meanings ascribed
to them in Rule 1-02 of Regulation S-X of the SEC.

     "Superior Proposal" shall have the meaning set forth in Section 6.06(a).

     "Surviving  Corporation"  shall mean (i) in the case of the Reverse Merger,
the  Company as the  surviving  corporation,  or (ii) in the case of the Forward
Merger, Sub as the surviving corporation.

     "Takeover Laws" shall have the meaning set forth in Section 5.01(m).

     "Tax Returns" shall have the meaning set forth in Section 5.01(q).

     "Taxes" shall mean all taxes,  charges,  fees, levies or other assessments,
however  denominated,  including,  without  limitation,  all net  income,  gross
income,  gross receipts,  sales, use, ad valorem,  goods and services,  capital,
transfer,  franchise,   profits,  license,  withholding,   payroll,  employment,
employer health, excise, estimated,  severance,  stamp, occupation,  property or
other taxes, custom duties, fees, assessments or charges of any kind whatsoever,
together  with any interest and any  penalties,  additions to tax or  additional
amounts imposed by any taxing authority  whether arising before, on or after the
Effective Date.

     "Termination Fee" shall have the meaning set forth in Section 8.02(b).

     "Trade  Secrets"  shall have the  meaning  set forth in the  definition  of
Intellectual Property Rights.

     "Trademarks"  shall  have  the  meaning  set  forth  in the  definition  of
Intellectual Property Rights.

     "Treasury Shares" shall mean shares of the Company Common Stock held by the
Company or any of its Subsidiaries.

     "U.S.  GAAP"  shall  mean  United  States  generally  accepted   accounting
principles.

     "Year 2000 Compliant" shall have the meaning set forth in Section 5.01(t).

     "$" shall mean United States Dollar.

                                   ARTICLE II

                        THE MERGER; EFFECTS OF THE MERGER

     2.01. The Merger. (a) The Reverse Merger. Upon the terms and subject to the
conditions set forth in this Agreement,  and in accordance with the DGCL, at the
Effective Time Sub will merge with and into the Company  pursuant to the Reverse
Merger.  Following  the  Effective  Time of the  Reverse  Merger,  the  separate
corporate  existence  of Sub  shall  cease and the  Company  shall  survive  and
continue to exist as a Delaware corporation.

     (b) The Forward Merger.  Notwithstanding  paragraph (a) of this Section, if
Nortel so elects  pursuant to notice to the Company at least three business days
prior to the Effective  Time,  upon the terms and subject to the  conditions set
forth in this Agreement,  and in accordance with the DGCL, at the Effective Time
the  Company  will  merge  with and into Sub  pursuant  to the  Forward  Merger;
provided,  however,  that  Nortel  may not so  elect if such  election  would be
reasonably  likely to cause  non-satisfaction  of any material  condition to the
Merger that would have been reasonably  likely to be satisfied in the absence of
such election.  Following the Effective Time of the Forward Merger, the separate
corporate  existence  of the  Company  shall  cease  and Sub shall  survive  and
continue to exist as a Delaware corporation.

     (c) Effectiveness and Effects of the Merger. Subject to the satisfaction or
waiver  of the  conditions  set forth in  Article  VII in  accordance  with this
Agreement,  the Merger shall become  effective upon the occurrence of the filing
in the  office  of  the  Secretary  of  State  of the  State  of  Delaware  of a
certificate of merger in accordance  with Section 251 of the DGCL, or such later
date and time as may be set forth in such certificate. The Merger shall have the
effects  prescribed  in  the  DGCL.  Without  limiting  the  generality  of  the
foregoing, and subject thereto, at the Effective Time all the property,  rights,
privileges,  powers and franchises of the Company and Sub shall be vested in the
Surviving  Corporation,  and all debt, liabilities and duties of the Company and
Sub shall become the debt, liabilities and duties of the Surviving Corporation.

     (d)  Certificate  of   Incorporation   and  By-Laws.   The  certificate  of
incorporation  and  by-laws  of  Sub,  as in  effect  immediately  prior  to the
Effective Time, but with Article 1 of the certificate of  incorporation  amended
to read:  "The name of the  Corporation  is Periphonics  Corporation,"  shall be
those of the  Surviving  Corporation  until  thereafter  changed  or  amended as
provided therein or by applicable law.

     (e) Name. The name of the Surviving  Corporation  shall remain (in the case
of the  Reverse  Merger) or be changed  to (in the case of the  Forward  Merger)
"Periphonics Corporation."

     (f) Officers and  Directors of Surviving  Corporation.  The officers of the
Company  as of the  Effective  Time  shall  be  the  officers  of the  Surviving
Corporation,  until the  earlier of their  resignation  or removal or  otherwise
ceasing to be an officer or until their  respective  successors are duly elected
and qualified, as the case may be. The directors of Sub as of the Effective Time
shall be the directors of the Surviving  Corporation  until the earlier of their
resignation  or removal or  otherwise  ceasing to be a director  or until  their
respective successors are duly elected and qualified, as the case may be.

     2.02.  Effective Date and Effective  Time.  Subject to the  satisfaction or
waiver (subject to applicable law) of the conditions as set forth in Article VII
in accordance with this Agreement, the parties shall cause the effective date of
the Merger  (the  "Effective  Date") to occur on (i) the third  Business  Day to
occur after the last of the conditions set forth in Section 7.01 shall have been
satisfied or waived in accordance  with the terms of this Agreement or (ii) such
other date to which the parties may agree in writing.  The time on the Effective
Date when the Merger  shall become  effective  is referred to as the  "Effective
Time."

     2.03. Tax  Consequences.  It is intended that the Merger shall qualify as a
reorganization under Section 368(a) of the Code.

                                   ARTICLE III

                    CONVERSION OF SHARES; EXCHANGE PROCEDURES

     3.01. Conversion of Shares. Subject to the provisions of this Agreement, at
the Effective Time, automatically by virtue of the Merger and without any action
on the part of any party or stockholder:

     (a) Conversion of Sub Common Stock.  Each share of common stock of Sub, par
value  $0.01  per  share  (the  "Sub  Common  Stock"),  issued  and  outstanding
immediately  prior to the  Effective  Time,  shall be  converted  into one newly
issued, fully-paid and non-assessable share of preferred stock, $0.01 par value,
of the Surviving Corporation, pursuant to a Certificate of Designations proposed
by Nortel and approved by the  Company,  such  approval  not to be  unreasonably
withheld or delayed.

     (b) Conversion of Company Common Stock. Subject to Section 3.04, each share
of common stock,  par value $0.01 per share, of the Company (the "Company Common
Stock") issued and  outstanding  immediately  prior to the Effective Time (other
than shares of Company Common Stock to be canceled  pursuant to Section 3.01(c))
shall become and be  converted  into the right to receive a fraction of a common
share,  without par value,  of Nortel  ("Nortel  Common  Shares"),  equal to the
Exchange  Ratio.  All of the shares of Company  Common Stock  converted into the
right to receive  Nortel  Common  Shares  (or cash  pursuant  to  Section  3.04)
pursuant  to  this  Article  III  shall  no  longer  be  outstanding  and  shall
automatically be canceled and shall cease to exist as of the Effective Time.

     (c) Treasury Shares. Each share of Company Common Stock held by the Company
or any wholly owned  Subsidiary  of the Company as Treasury  Shares  immediately
prior to the Effective Time or owned by Nortel or any  Subsidiary  thereof shall
no longer be outstanding and shall  automatically be canceled and retired at the
Effective Time and no consideration shall be issued in exchange therefor.

     3.02.  Issuance of Shares of the  Surviving  Corporation.  At the Effective
Time, in  consideration of the issuance by Nortel of Nortel Common Shares to the
holders  of  Company  Common  Stock in  accordance  with  Section  3.01(b),  the
Surviving  Corporation shall issue to Nortel a number of shares of newly issued,
fully-paid and  non-assessable  common stock,  $0.01 par value, of the Surviving
Corporation,  which  number  shall be equal to the  number of shares of  Company
Common Stock outstanding as of immediately prior to the Effective Time.

     3.03.  Rights as  Stockholders;  Stock  Transfers.  At the Effective  Time,
holders of Company  Common Stock shall cease to be, and shall have no rights as,
stockholders  of the  Company,  other than the right to receive any  dividend or
other  distribution with respect to such Company Common Stock with a record date
occurring prior to the Effective Time and the consideration  provided under this
Article III. After the Effective Time,  there shall be no transfers on the stock
transfer books of the Company or the Surviving  Corporation of shares of Company
Common Stock.

     3.04.  Fractional  Shares.  Notwithstanding  any other provision hereof, no
fractional Nortel Common Shares and no certificates or scrip therefor,  or other
evidence of ownership  thereof,  will be issued in the Merger;  instead,  Nortel
shall pay to each holder of Company Common Stock who would otherwise be entitled
to a fractional share of Nortel Common Shares (after taking into account all Old
Certificates  delivered  by such  holder)  an amount (in U.S.  dollars)  in cash
(without interest) determined by multiplying such fraction by the Average Nortel
Trading Price. As promptly as practicable  after the determination of the amount
of cash, if any, to be paid to holders of fractional interests,  Nortel shall so
notify the Exchange Agent,  and Nortel shall cause the Surviving  Corporation to
deposit such amount with the Exchange  Agent and shall cause the Exchange  Agent
to forward  payments to such holders of fractional  interests  subject to and in
accordance with the terms hereof.

     3.05.  Exchange  Procedures.  (a) At or prior to the Effective Time, Nortel
shall  deposit,  or shall cause to be  deposited,  with a bank or trust  company
having  (or whose  parent  has) net  capital of not less than  $10,000,000  (the
"Exchange  Agent"),  for the  benefit of the  holders of  certificates  formerly
representing shares of Company Common Stock ("Old  Certificates"),  for exchange
in accordance with this Article III, certificates representing the Nortel Common
Shares ("New  Certificates") and an estimated amount of cash pursuant to Section
3.04 (such cash and New  Certificates  (without  any interest on any such cash),
being  hereinafter  referred to as the  "Exchange  Fund") to be paid pursuant to
this Article III in exchange for outstanding shares of Company Common Stock.

     (b) As promptly as practicable  after the Effective Date, Nortel shall send
or cause the Exchange Agent to send or cause to be sent to each former holder of
record  of  shares  (other  than  Treasury   Shares)  of  Company  Common  Stock
immediately  prior  to the  Effective  Time  transmittal  materials  for  use in
exchanging such  stockholder's  Old Certificates for the consideration set forth
in this Article III. Nortel shall cause the New Certificates representing Nortel
Common  Shares into which  shares of a  stockholder's  Company  Common Stock are
converted at the  Effective  Time and/or any check in respect of any  fractional
share  interests  or  dividends  or  distributions  which such  person  shall be
entitled  to  receive  pursuant  to this  Article  III to be  delivered  to such
stockholder upon delivery to the Exchange Agent of Old Certificates representing
such shares of Company Common Stock (or,  pursuant to Section 3.05(f),  a surety
bond  reasonably  satisfactory  to Nortel and the Exchange Agent, if any of such
certificates  are  lost,  stolen or  destroyed)  owned by such  stockholder.  No
interest  will be paid on any such cash to be paid in lieu of  fractional  share
interests  or in respect of  dividends  or  distributions  which any such person
shall be entitled to receive pursuant to this Article III upon such delivery.

     (c) Notwithstanding the foregoing, neither the Exchange Agent nor any party
hereto  shall be liable to any  former  holder of Company  Common  Stock for any
amount properly delivered to a public official pursuant to applicable  abandoned
property, escheat or similar laws.

     (d) No  dividends  or other  distributions  with  respect to Nortel  Common
Shares with a record date  occurring  after the Effective  Time shall be paid to
the holder of any unsurrendered Old Certificate  representing  shares of Company
Common Stock  converted  in the Merger into the right to receive  shares of such
Nortel  Common  Shares  and  cash in lieu of  fractional  Nortel  Common  Shares
pursuant to Section 3.04,  until the holder thereof shall be entitled to receive
New Certificates and such amount of cash in exchange therefor in accordance with
this Article III.  After  becoming so entitled in  accordance  with this Article
III,  the record  holder  thereof  also shall be  entitled  to receive  any such
dividends  or  other   distributions,   without  any  interest  thereon,   which
theretofore  had become payable with respect to Nortel Common Shares such holder
had the right to receive  upon  surrender  of the Old  Certificate,  and payment
thereof shall be made promptly following the later of (i) the date on which such
holder shall become  entitled to receive New  Certificates  and (ii) the payment
date with respect to such dividend or other distribution.

     (e)  Any  portion  of the  Exchange  Fund  that  remains  unclaimed  by the
stockholders  of the Company for one year after the Effective  Time shall,  upon
demand by Nortel,  be paid or  delivered  to  Nortel.  Any  stockholders  of the
Company who have not theretofore complied with this Article III shall thereafter
look only to Nortel for payment of the Nortel Common Shares, cash in lieu of any
fractional  shares and unpaid  dividends and  distributions on the Nortel Common
Shares  deliverable  in  respect  of each  share of  Company  Common  Stock such
stockholder  holds as  determined  pursuant  to this  Agreement,  in each  case,
without any interest thereon.

     (f) If any Old Certificate shall have been lost, stolen or destroyed,  upon
the  making  of an  affidavit  of that  fact by the  person  claiming  such  Old
Certificate to be lost,  stolen or destroyed and the posting by such person of a
bond in such  reasonable  amount as Nortel may direct as  indemnity  against any
claim that may be made against it or the Surviving  Corporation  with respect to
such Old  Certificate,  Nortel  shall,  in  exchange  for such  lost,  stolen or
destroyed Old Certificate,  deliver or cause the Exchange Agent to deliver a New
Certificate in respect thereof pursuant to this Article III.

     3.06. Anti-Dilution Provisions. In the event Nortel changes (or establishes
a record  date for  changing)  the  number of Nortel  Common  Shares  issued and
outstanding  prior to the  Effective  Time as a result of a stock  split,  stock
dividend, recapitalization, subdivision, reclassification, combination, exchange
of shares or similar  transaction with respect to the outstanding  Nortel Common
Shares then (a) if the record and payment dates  therefor  shall be prior to the
Effective Time, the Exchange Ratio shall be proportionately  adjusted to reflect
such   stock   split,    stock    dividend,    recapitalization,    subdivision,
reclassification,  combination,  exchange of shares or similar transaction;  and
(b) if the record date  therefor  shall be prior to the  Effective  Time but the
payment date therefor  shall be subsequent to the Effective  Time,  Nortel shall
take such action as shall be required  so that on such  payment  date any former
holder of Old Certificates who shall have received or become entitled to receive
New Certificates  pursuant to this Article III shall be entitled to receive such
additional  Nortel  Common Shares as such holder would have received as a result
of such  event if the  record  date  therefor  had been  immediately  after  the
Effective Time.

     3.07.  Stock  Options and Other Stock Plans.  (a) Subject to Section  6.17:
Effective  at the  Effective  Time,  each option to  purchase  shares of Company
Common Stock (collectively, the "Company Stock Options") granted to employees or
directors  of, or  consultants  or advisors  to, the  Company or any  Subsidiary
thereof  pursuant to the terms of the Periphonics  Corporation 1995 Stock Option
Plan, the Periphonics  Corporation 1995 Non-Employee  Director Stock Option Plan
or the Periphonics  Corporation 1986 Incentive Stock Option Plan  (collectively,
the "Company Stock Option Plans") that is outstanding  immediately  prior to the
Effective  Time shall be assumed by Nortel and deemed to constitute an option to
acquire, on the same terms and conditions  (including  adjustments for any stock
dividend, subdivision,  reclassification,  recapitalization, split, combination,
exchange  of  shares or  similar  transaction  following  such and the terms and
conditions  approved by  resolution  of the Company  Board  adopted on April 15,
1999) as were applicable  under such Company Stock Option  immediately  prior to
the Effective  Time,  the number of Nortel  Common  Shares  (rounded down to the
greatest  number of whole Nortel Common  Shares) that is equal to the product of
(i) the number of shares of Company  Common Stock  covered by such Company Stock
Option  immediately  prior to the Effective Time multiplied by (ii) the Exchange
Ratio,  at an option  exercise  price per share of Nortel Common Shares equal to
the  quotient  of (iii) the option  exercise  price per share of Company  Common
Stock  covered by such Company Stock Option  immediately  prior to the Effective
Time divided by (iv) the Exchange Ratio.  The date of grant of each such Company
Stock Option shall be the date on which such Company Stock Option was originally
granted.  Any  Company  Stock  Option,  the terms and  conditions  of which were
amended  pursuant to the  resolutions  adopted by the Company Board on April 15,
1999 to provide for the  acceleration  of the vesting of such stock  option as a
result of the Merger,  shall  become  vested in  accordance  with such terms and
conditions as so amended.  Within three  Business  Days  following the Effective
Date,  Nortel  shall cause to be  delivered  to each  holder of a Company  Stock
Option that has been  assumed by Nortel  pursuant to this  Section 3.07 a notice
stating that (x) such Company Stock Option has been  converted into an option to
purchase Nortel Common Shares, (y) such Company Stock Option has been assumed by
Nortel and shall  continue in effect  subject to all of the terms and conditions
applicable thereto immediately prior to the Effective Time and (z) setting forth
the number of Nortel Common Shares  covered by such Company Stock Option and the
per share option  exercise price for such Nortel Common  Shares.  From and after
the Effective Time,  Nortel and the Surviving  Corporation shall comply with the
terms of each  Company  Stock  Option Plan  pursuant to which the Company  Stock
Options  were  granted;  provided,  that the board of  directors of Nortel or an
authorized   committee   thereof   shall   succeed   to  the   authorities   and
responsibilities of the Company Board or any committee thereof under the Company
Stock Option Plans. The adjustments  provided herein with respect to any Company
Stock Options that are  "incentive  stock options" (as defined in Section 422 of
the Code) shall be effected in a manner  consistent  with Section  424(a) of the
Code.

     (b) Prior to the  Effective  Date,  the Company shall take all necessary or
appropriate action (including  amending any of the Company Stock Option Plans or
making  adjustments as permitted thereby) to (i) use its reasonable best efforts
to obtain as  promptly as possible  following  the mailing of the Company  Proxy
Statement,  the written  consent of each holder of a Company  Stock Option (in a
form  reasonably  satisfactory  to  counsel to  Nortel)  to the  assumption  and
conversion of such individual's Company Stock Options as contemplated in Section
3.07(a),  (ii)  effectuate  the  assumption  and conversion of the Company Stock
Options  by  Nortel  and  the  assignment  to  Nortel  of  the  authorities  and
responsibilities of the Company Board or any committee thereof under the Company
Stock  Option  Plans and (iii)  other than as  expressly  permitted  pursuant to
Section  4.01(b),  preclude the grant of any  additional  Company  Stock Options
under any of the Company Stock Option Plans or otherwise.

     (c)  Nortel  shall  cause to be taken all  corporate  action  necessary  to
reserve for issuance a sufficient  number of Nortel  Common  Shares for delivery
upon exercise of Company  Stock  Options in  accordance  with this Section 3.07.
Within  five  business  days  after the  Effective  Date,  Nortel  shall use its
reasonable  best efforts to cause the Nortel  Common  Shares  subject to Company
Stock  Options  to  be  registered  under  the  Securities  Act  pursuant  to  a
registration statement on Form S-8 (or any successor or other appropriate forms)
and shall use its  reasonable  best efforts to cause the  effectiveness  of such
registration  statement (and current  status of the  prospectus or  prospectuses
contained  therein) to be maintained for so long as Company Stock Options remain
outstanding.

     (d) The  Company  shall take such  action as is  necessary  to cause a "new
exercise date," within the meaning of the Periphonics  Corporation 1995 Employee
Stock Purchase Plan (the "Company Stock Purchase Plan"),  to be established that
will cause the offering  period under such Company Stock Purchase Plan in effect
immediately  prior to the  Effective  Date to  terminate as of a date that is no
later than three Business Days prior to the Effective  Date;  provided that such
change in the offering period shall be conditioned  upon the consummation of the
Merger. On such new exercise date, the Company shall apply the funds credited as
of such date under the Company  Stock  Purchase  Plan within each  participant's
payroll  withholding  account to the purchase of whole shares of Company  Common
Stock  in  accordance  with  the  terms  of the  Company  Stock  Purchase  Plan.
Immediately  prior to and effective as of the Effective  Time and subject to the
consummation  of the  Merger,  the Company  shall  terminate  the Company  Stock
Purchase Plan.

                                   ARTICLE IV

                             ACTIONS PENDING MERGER

     4.01. Forbearances of the Company. From the date hereof until the Effective
Time,  except as  expressly  contemplated  by this  Agreement,  as required by a
Governmental Authority of competent jurisdiction or as set forth in Section 4.01
of the  Company's  Disclosure  Schedule,  without the prior  written  consent of
Nortel, the Company will not, and will cause each of its Subsidiaries not to:

     (a)  Ordinary  Course.  Conduct  its  business  and  the  business  of  its
Subsidiaries  other  than in the  ordinary  and  usual  course  in all  material
respects and in material  compliance with applicable laws and regulations or, to
the extent consistent therewith, fail to use reasonable best efforts to preserve
intact  their  business  organizations  and assets and  maintain  their  rights,
franchises  and existing  relations  with  customers,  suppliers,  employees and
business associates,  or take any action that would adversely affect its ability
to perform any of its material  obligations under this Agreement in any material
respect;  provided,  however,  that no action by the Company or its Subsidiaries
with respect to matters  specifically  addressed by any other  provision of this
Section 4.01 shall be deemed a breach of this Section 4.01(a) unless such action
would constitute a breach of one or more of such other provisions.

     (b) Capital Stock.  (i) Issue,  sell,  pledge,  dispose of or encumber,  or
authorize or propose the issuance, sale, pledge,  disposition or encumbrance of,
any shares of its  capital  stock or any Rights,  (ii) enter into any  agreement
with respect to the foregoing or (iii) permit any  additional  shares of capital
stock to become  subject to new grants of employee or  director  stock  options,
other Rights or similar  stock-based  employee rights,  other than (v) automatic
grants,  if any, of stock options to purchase Company Common Stock in accordance
with the terms of the Company 1995 Non-Employee Director Stock Option Plan as in
effect on the date  hereof,  (w) grants of stock  options to  purchase  up to an
aggregate of 50,000 shares of the Company  Common Stock in  accordance  with the
terms of the Company  1995 Stock  Option  Plan,  as amended and in effect on the
date  hereof,  to new  employees  hired after the date hereof  and/or to current
employees (other than current  officers or other  executives) in connection with
the  promotion or retention of any such current  employee,  in any such case, in
the ordinary  course of business,  (x) the issuance of the Company  Common Stock
upon the exercise of stock options  outstanding  as of the date hereof issued in
the  ordinary  course of  business in  accordance  with the terms of any Company
Stock  Option  Plan as in effect on the date of this  Agreement  or  granted  as
permitted under clause (v) above,  (y) issuances by a wholly owned Subsidiary of
the Company of capital  stock to such  Subsidiary's  parent and (z) issuances to
comply with the Company's obligations under the Company Stock Purchase Plan.

     (c)  Dividends,  Etc. (i) Make,  declare,  pay or set aside for payment any
dividend (other than dividends from the Company's Subsidiaries to the Company or
another  Subsidiary  of the Company) on or in respect of, or declare or make any
distribution  on any  shares of its  capital  stock or (ii)  except for any such
transaction  by a wholly owned  Subsidiary of the Company which remains a wholly
owned Subsidiary after consummation of such transaction,  directly or indirectly
adjust, split, combine, redeem,  reclassify,  purchase,  repurchase or otherwise
acquire,  any  shares  of  the  capital  stock  of  the  Company  or  any of its
Subsidiaries.

     (d)  Compensation;  Employment  Agreements;  Etc.  Enter  into or amend any
employment,  consulting,  severance,  retention,  change in  control  or similar
agreements  or  arrangements  with  any of its or its  Subsidiaries'  directors,
officers,  employees or consultants or former directors,  officers, employees or
consultants,  or grant any salary, wage or other compensation increase, make any
award or grant  under  any Plan or  increase  or  modify  any  employee  benefit
(including any incentive or bonus payments),  except (i) for increases in annual
salary or hourly wage rates granted to current  employees  (other than officers)
in the ordinary  course of business,  consistent  with past  practice,  (ii) for
changes  required to be implemented in accordance  with the current terms of any
Company Plan set forth in Section 4.01(d) of the Company's  Disclosure  Schedule
and (iii) grants of stock options permitted under Section 4.01(b).

     (e) Benefit Plans.  Enter into,  adopt,  implement or amend in any material
respect (except to the extent required to comply with applicable law) any Plan.

     (f)  Acquisitions  and  Dispositions.  Except  in the  ordinary  course  of
business,  consistent  with past  practice,  acquire  all or any  portion of the
assets, business or properties of any other entity or sell, transfer,  mortgage,
encumber  or  otherwise  dispose of or  discontinue  any  portion of its assets,
business or properties.

     (g) Amendments. Amend the Company Certificate or the Company's by-laws.

     (h)  Accounting  Methods.  Implement or adopt any change in its  accounting
principles,  practices or methods, other than as may be required by U.S. GAAP or
SEC regulation.

     (i) Contracts. Except in the ordinary course of business, (i) enter into or
terminate (x) any customer  contract or agreement in excess of  $3,000,000,  (y)
any  contract  or  agreement  with a supplier  that does not conform in size and
scope to similar contracts entered into by the Company or its Subsidiaries prior
to the date hereof or (z) any material lease or other agreement or (ii) amend or
modify in a material respect any of its existing material contracts,  agreements
or leases (including any material licensing agreement).

     (j) Claims.  Except in the ordinary  course of business,  settle any claim,
action or  proceeding  involving  money  damages  in excess of  $100,000  in the
aggregate or involving any  restrictions  or  limitations  on the Company or the
Company's business.

     (k)  Adverse  Actions.  (i) Take any action  with the  Knowledge  that such
action  would,  or is  reasonably  likely to,  prevent or impede the Merger from
qualifying as a reorganization within the meaning of Section 368(a) of the Code;
or (ii)  knowingly  take any action that is intended or is reasonably  likely to
result  in (A) any of its  representations  and  warranties  set  forth  in this
Agreement  being or  becoming  untrue  at any time at or prior to the  Effective
Time,  (B) except as otherwise  permitted by Section 6.06, any of the conditions
to the Merger set forth in Article VII not being  satisfied or  satisfaction  of
any such condition being materially  delayed or (C) a violation of any provision
of this Agreement except, in each case, as may be required by applicable law.

     (l)  Incurrence of  Indebtedness.  Other than (i)  short-term  indebtedness
incurred in the ordinary course of business consistent with past practice but in
no event to  exceed an  aggregate  of  $1,000,000  of  short-term  debt and (ii)
indebtedness of the Company or any of its  Subsidiaries to the Company or any of
its Subsidiaries,  incur any indebtedness for borrowed money, assume, guarantee,
endorse or otherwise as an accommodation  become responsible for the obligations
of any  other  individual,  corporation  or  other  entity,  or make any loan or
advance.

     (m)  Capital  Expenditures.  Make any  capital  expenditures  in  excess of
$2,000,000 in the aggregate in any quarter of the year.

     (n) Tax  Elections.  Make any new or different  material Tax  election,  or
revoke any material Tax election.

     (o) Confidentiality  Agreements.  Waive any confidentiality or "standstill"
provisions   entered  into  with  any  third  party  in   connection   with  its
consideration of an Acquisition Proposal.

     (p)  Agreements.  Agree or commit to do  anything  prohibited  by the above
paragraphs (a) through (o).

     4.02.  Forbearances  of Nortel.  From the date hereof  until the  Effective
Time,  except as  expressly  contemplated  by this  Agreement or as set forth in
Section 4.02 of Nortel's Disclosure Schedule,  without the prior written consent
of the Company, Nortel will not, and will cause each of its Subsidiaries not to:

     (a)  Dividends,  Etc. (i) Make,  declare,  pay or set aside for payment any
extraordinary cash dividend on or in respect of the Nortel Common Shares.

     (b)  Adverse  Actions.  (i) Take any action  with the  Knowledge  that such
action  would,  or is  reasonably  likely to,  prevent or impede the Merger from
qualifying as a reorganization within the meaning of Section 368(a) of the Code;
or (ii)  knowingly  take any action that is intended or is reasonably  likely to
result  in (A) any of its  representations  and  warranties  set  forth  in this
Agreement  being or  becoming  untrue  at any time at or prior to the  Effective
Time,  (B) subject to Section  6.11(d),  any of the conditions to the Merger set
forth in Article VII not being  satisfied or  satisfaction of any such condition
being  materially  delayed or (C) a violation of any provision of this Agreement
except, in each case, as may be required by applicable law.

     (c)  Agreements.  Agree or commit to do  anything  prohibited  by the above
paragraphs (a) and (b).

                                    ARTICLE V

                         REPRESENTATIONS AND WARRANTIES

     5.01. Representations and Warranties of the Company. Except as set forth in
the  disclosure  schedule  delivered  by the  Company  to  Nortel  prior  to the
execution of this Agreement (the "Company Disclosure Schedule") (each section of
which  qualifies the  correspondingly  numbered  representation  and warranty or
covenant to the extent  specified  therein),  the Company hereby  represents and
warrants to each of Nortel and Sub as follows:

     (a) Organization, Standing and Authority. The Company is a corporation duly
organized,  validly  existing  and  in  good  standing  under  the  laws  of the
jurisdiction of its organization.  It is duly qualified to do business and is in
good standing in the states of the United States and foreign jurisdictions where
its  ownership  or leasing of property or assets or the conduct of its  business
requires it to be so qualified  and it has in effect all federal,  state,  local
and foreign  governmental  authorizations  necessary  for it to own or lease its
properties  and  assets  and to carry on its  business  as it is now  conducted,
except where the failure to be so duly qualified and in good standing or to have
in effect all federal,  state,  local, and foreign  governmental  authorizations
does not have, and would not reasonably be expected to have,  individually or in
the aggregate,  a Material  Adverse Effect on the Company.  The Company has made
available  to  Nortel  a  complete  and  correct  copy  of  its  certificate  of
incorporation  and  by-laws,  each as amended and in full force and effect as of
the date of this Agreement, and the Company is not in violation of any provision
thereof.

     (b) Shares.

     (i) The authorized  capital stock of the Company consists of (A) 30,000,000
shares of Company Common Stock, par value $0.01 of which 13,236,840  shares were
outstanding as of August 20, 1999 (the "Capitalization  Date") and (B) 1,000,000
shares of  preferred  stock,  par value  $0.01  per  share  ("Company  Preferred
Stock"),  of which no shares were issued or outstanding as of the Capitalization
Date  and  750,000  shares  of  which  have  been  designated  Series  A  Junior
Participating  Preferred Stock ("Company Series A Preferred Stock") and reserved
for issuance upon exercise of the rights (the  "Company  Stockholder  Protection
Rights") distributed to the holders of Company Common Stock pursuant to a Rights
Agreement dated as of July 31, 1996,  between the Company and the American Stock
Transfer & Trust  Company,  as Rights  Agent,  as amended (the  "Company  Rights
Agreement").  Since the  Capitalization  Date,  there have been no  issuances of
shares  of the  capital  stock of the  Company  or any other  securities  of the
Company  other  than  issuances  of shares  pursuant  to Company  Stock  Options
outstanding on the Capitalization Date as set forth in clause (iii) below.

     (ii) All issued and  outstanding  shares of Company  Common Stock have been
duly authorized and validly issued, and are fully paid and nonassessable, and no
class of capital stock of the Company is entitled to preemptive rights.

     (iii)  There  were  outstanding  at the  Capitalization  Date no  Rights to
acquire  capital stock from the Company  other than (A) the Company  Stockholder
Protection  Rights,  (B) Company  Stock Options and (C) rights under the Company
Stock Purchase Plan, the Rights referred to in clauses (B) and (C)  representing
in the aggregate the right to purchase 1,729,200 shares of Company Common Stock.
Section  5.01(b)(iii)  of the Company's  Disclosure  Schedule sets forth for all
Company Stock Options outstanding at the Capitalization Date a true and complete
list of the following:  their holders, their date of grant, the number of shares
of Company Common Stock for which they are exercisable,  their exercise price as
currently in effect,  their date of vesting and the  conditions,  if any,  under
which such  vesting may  accelerate.  Other than in  connection  with the Option
Agreement and other than the associated  Company  Stockholder  Protection Rights
issued with the shares of Company Common Stock issued as described in clause (i)
above,  no Rights to acquire  capital stock from the Company have been issued or
granted since the Capitalization Date.

     (c) Subsidiaries.

     (i) Section 5.01(c)(i) of the Company Disclosure Schedule sets forth a list
as of the date hereof of all of the Company's Subsidiaries,  together with their
jurisdiction of organization.  Unless otherwise  described therein,  the Company
owns, directly or indirectly,  beneficially and of record 100% of the issued and
outstanding  voting  securities of each such  Subsidiary  (other than directors'
qualifying  shares,  if  any).  No  equity  securities  of any of the  Company's
Subsidiaries  are or may become required to be issued (other than to the Company
or its  wholly  owned  Subsidiaries)  by reason of any  Rights  and there are no
contracts,  commitments,  understandings  or  arrangements  by which any of such
Subsidiaries is bound to sell or otherwise  transfer any shares of capital stock
of any  such  Subsidiaries  (other  than  to the  Company  or its  wholly  owned
Subsidiaries).  In  addition,  Section  5.01(c)(i)  of  the  Company  Disclosure
Schedule lists as of the date of this Agreement each  corporation,  partnership,
limited  liability  company or similar  entity with respect to which,  as of the
date of this  Agreement,  the Company or any Subsidiary of the Company owns more
than 5% but less than a majority of the voting equity or similar voting interest
or any interest  convertible into, or exchangeable or exercisable for, more than
5% but less than a majority of the voting equity or similar voting  interest and
which interest is carried on the Company's most recent financial  statements (or
if not held as of the date thereof,  would be carried on the Company's financial
statements  if prepared as of the date  hereof) at a value in excess of $500,000
(collectively,  the "Company  Equity  Interests").  All of the shares of capital
stock of each of the Significant Subsidiaries of the Company and all the Company
Equity  Interests  held by the  Company and each  Subsidiary  of the Company are
fully paid and  nonassessable  and are owned by the  Company or such  Subsidiary
free and clear of any  Liens.  There  are no  material  outstanding  contractual
obligations  of the Company or any of its  Subsidiaries  to provide funds to, or
make any investment (in the form of a loan,  capital  contribution or otherwise)
in any  entity in which the  Company or any  Subsidiary  of the  Company  owns a
Company Equity Interest.

     (ii) Each of the  Company's  Subsidiaries  has been duly  organized  and is
validly  existing in good  standing  under the laws of the  jurisdiction  of its
organization.  Each of such Subsidiaries is duly qualified to do business and in
good standing in the jurisdictions where its ownership or leasing of property or
the  conduct of its  business  requires  it to be so  qualified  and each has in
effect  all  federal,  state,  local  and  foreign  governmental  authorizations
necessary for it to own or lease its  properties  and assets and to carry on its
business  as it is  now  conducted,  except  where  the  failure  to be so  duly
qualified and in good standing or to have in effect all federal,  state,  local,
and foreign governmental  authorizations does not have, and would not reasonably
be expected to have, individually or in the aggregate, a Material Adverse Effect
on the Company.

     (d)  Corporate  Power.  The  Company and each of its  Subsidiaries  has the
corporate  power  and  authority  to carry on its  business  as it is now  being
conducted  and to own all its  properties  and assets;  and it has the corporate
power and authority to execute,  deliver and perform its obligations  under this
Agreement  and  the  Option   Agreement  and  to  consummate  the   transactions
contemplated hereby and thereby.

     (e) Corporate Authority.

     (i) Subject,  in the case of the consummation of the Merger,  to receipt of
the requisite  approval and adoption of the  "agreement of merger" (as such term
is used in Section 251 of the DGCL)  contained in this  Agreement and the Merger
by the holders of a majority of the  outstanding  shares of Company Common Stock
entitled  to vote  thereon,  the  Company  Board  having  unanimously  adopted a
resolution  approving such "agreement of merger" and declaring its advisability,
this Agreement,  the Option Agreement and the transactions  contemplated  hereby
and  thereby  have been  authorized  by all  necessary  corporate  action of the
Company  and the  Company  Board  (assuming  that  neither  Nortel  or Sub is an
"interested   stockholder"  of  the  Company  under  Section  203  of  the  DGCL
immediately  before the  execution  and delivery of this  Agreement,  the Option
Agreement, and the Stockholders' Agreement).

     (ii) This Agreement and the Option  Agreement are legal,  valid and binding
agreements of the Company, enforceable in accordance with their terms (except as
such  enforceability  may  be  limited  by  applicable  bankruptcy,  insolvency,
reorganization,  moratorium,  fraudulent  transfer  and similar  laws of general
applicability  relating to or affecting  creditors'  rights or by general equity
principles, whether considered at law or in equity).

     (f) No  Defaults.  Subject  to  receipt of the  regulatory  approvals,  and
expiration of the waiting  periods,  referred to in Section 5.01(r) and required
filings  under  federal  and state  securities  or other  laws,  the  execution,
delivery and  performance  of this  Agreement  and the Option  Agreement and the
consummation of the transactions  contemplated hereby and thereby by the Company
do not and will not (i) constitute a breach or violation of, or a default under,
any law, rule or regulation or any judgment,  decree, order, governmental permit
or license,  or  agreement,  indenture or instrument of the Company or of any of
its  Subsidiaries  or to which the Company or any of its  Subsidiaries or any of
their  respective  properties or assets are subject or bound,  (ii) constitute a
breach or  violation  of, or a default  under,  the articles or  certificate  of
incorporation  or by-laws of the  Company  or any of its  Subsidiaries  or (iii)
require any consent or approval under any such law, rule, regulation,  judgment,
decree,  order,  governmental  permit  or  license,   agreement,   indenture  or
instrument, except in the case of (i) and (iii), where such breach, violation or
default or the failure to obtain such  consents  or  approvals  would not in the
aggregate  have  a  Material  Adverse  Effect  on  the  Company,  the  Surviving
Corporation  or Nortel and would not prevent or materially  impair the Company's
ability to consummate the transactions  contemplated by this Agreement.  Section
5.01(f) of the Company  Disclosure  Schedule  contains a list of all consents of
third parties required under any material  agreement to be obtained by it or its
subsidiaries prior to, or as a result of, the consummation of the Merger.

     (g) Financial Reports and SEC Documents.

     (i) With  respect to the periods  since May 31,  1996,  the Company and its
Subsidiaries have filed all reports and statements, together with any amendments
required to be made thereto, that were required to be filed with the SEC.

     (ii) The Company's  Annual  Reports on Form 10-K for the fiscal years ended
May 31, 1996, 1997, and 1998, its Quarterly Reports on Form 10-Q for the periods
ended  August 31, 1998,  November 30, 1998 and February 28, 1999,  and all other
reports,  registration  statements,  definitive  proxy statements or information
statements filed or to be filed by it or any of its  Subsidiaries  subsequent to
May 31, 1996 under the Securities  Act, or under Sections  13(a),  13(c),  14 or
15(d) of the Exchange Act, in the form filed, or to be filed (collectively,  the
"Company SEC  Documents"),  with the SEC, as of the date filed (or, with respect
to a  document  filed  prior  to the  date  of this  Agreement  and  amended  or
superseded by a subsequent  filing prior to the date of this Agreement,  then on
the date of such filing as so amended or superseded) (A) complied or will comply
in all material respects as to form with the applicable  requirements  under the
Securities Act or the Exchange Act, as the case may be; and (B) did not and will
not contain any untrue  statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements  therein,
in light of the  circumstances  under which they were made, not misleading;  and
each of the balance sheets  contained in or  incorporated  by reference into any
such Company SEC Document  (including  the related notes and schedules  thereto)
fairly presents and will fairly present the financial  position of the entity or
entities  to which it  relates  as of its date,  and each of the  statements  of
income  and  changes  in  stockholders'  equity  and cash  flows  or  equivalent
statements  in such  Company SEC  Documents  (including  any  related  notes and
schedules  thereto)  fairly  presents  and will  fairly  present  the results of
operations,  changes in  stockholders'  equity and changes in cash flows, as the
case may be, of the entity or  entities  to which it relates  for the periods to
which  they  relate,  in each case in  accordance  with U.S.  GAAP  consistently
applied during the periods  involved and  Regulation  S-X of the SEC,  except in
each case as may be noted therein,  subject to normal year-end audit adjustments
in the case of unaudited statements.

     (iii) Since February 28, 1999, the Company has not incurred any liabilities
(whether absolute,  accrued,  contingent or otherwise) that are of a nature that
would be  required  to be  disclosed  on a balance  sheet of the  Company or the
footnotes  related  thereto  prepared in conformity  with U.S. GAAP,  except (x)
liabilities as set forth in the Company SEC Documents filed prior to the date of
this  Agreement (the "Company Filed SEC  Documents")  and (y) other  liabilities
incurred in the ordinary course of business consistent with past practice, which
do not have,  and would not reasonably be expected to have,  individually  or in
the aggregate, a Material Adverse Effect on the Company.

     (iv) The Company has furnished to Nortel a draft (dated August 17, 1999) of
its Annual Report on Form 10-K for the fiscal year ended May 31, 1999 (including
a draft of the consolidated  financial  statements to be included therein,  with
accompanying  footnote disclosure) (the "Draft 1999 10-K"). The Company's Annual
Report on Form 10-K for the fiscal  year ended May 31,  1999 shall be filed with
the SEC on or  before  August  30,  1999 and shall  not  differ in any  material
respect  from the Draft  1999  10-K,  except  for the  inclusion  of  disclosure
relating  to  this  Agreement  and the  transactions  contemplated  hereby.  The
consolidated  balance sheet contained in the Draft 1999 10-K fairly presents the
financial  position  of the Company as of May 31,  1999,  and the  statement  of
income and  changes in  stockholders'  equity and cash flows for the fiscal year
ended May 31, 1999 contained in the Draft 1999 10-K fairly present the Company's
consolidated results of operations,  changes in stockholders' equity and changes
in cash  flows for such  periods,  in each  case in  accordance  with U.S.  GAAP
applied consistently with past periods and Regulation S-X of the SEC.

     (h)  Litigation.  Except as  disclosed  on Section  5.01(h) of the  Company
Disclosure Schedule,  in the Company Filed SEC Documents or the Draft 1999 10-K,
(i) no litigation,  claim or other  proceeding  before any court or governmental
agency that is pending or, to the Company's  Knowledge,  threatened  against the
Company  or any of its  Subsidiaries  would  reasonably  be  expected  to  have,
individually or in the aggregate,  a Material  Adverse Effect on the Company and
(ii) no litigation,  claim or other proceeding  before any court or governmental
agency is pending or, to the Company's Knowledge, threatened against the Company
or any of its Subsidiaries which, if determined  adversely to the Company or any
such  Subsidiary,  would reasonably be expected to result in a loss of more than
$100,000 or the imposition of any material  restrictions  on the business of the
Company or any such Subsidiary.

     (i) Compliance with Laws. The Company and each of its Subsidiaries:

     (i) is in compliance with all applicable federal,  state, local and foreign
statutes,  laws, regulations,  ordinances,  rules, judgments,  orders or decrees
applicable thereto or to the employees conducting such businesses,  except where
failure to so comply  does not have,  and would not  reasonably  be  expected to
have,  individually  or in the  aggregate,  a  Material  Adverse  Effect  on the
Company;

     (ii) has all permits,  licenses,  authorizations,  orders and approvals of,
and has made all filings,  applications and registrations with, all Governmental
Authorities  that  are  required  in  order  to  permit  them to  conduct  their
businesses substantially as presently conducted, and all such permits, licenses,
certificates  of  authority,  orders and  approvals are in full force and effect
and,  to its  Knowledge,  no  suspension  or  cancellation  of any  of  them  is
threatened,   except  for  (x)   failures  to  hold  such   permits,   licenses,
authorizations,  orders and  approvals  and (y)  failures to make such  filings,
applications, and registrations,  which do not have, and would not reasonably be
expected to have, individually or in the aggregate, a Material Adverse Effect on
the Company; and

     (iii)  has  received  since  May  31,  1998  no  written   notification  or
communication from any Governmental  Authority (A) asserting that the Company or
any  of  its  Subsidiaries  is  not in  compliance  with  any  of the  statutes,
regulations  or ordinances  which such  Governmental  Authority  enforces or (B)
threatening   to  revoke  any  license,   franchise,   permit  or   governmental
authorization.

     (j) Material  Contracts;  Defaults.  Except for this Agreement,  the Option
Agreement,  and those  agreements and other  documents  filed as exhibits to the
Company  Filed SEC  Documents,  as of the date of this  Agreement,  neither  the
Company nor any of its  Subsidiaries is a party to or bound by (i) any "material
contract"  within the meaning of Item 601(b)(10) of the SEC's  Regulation S-K or
(ii) any  non-competition  agreement  or other  agreement  or  arrangement  that
materially restricts it or any of its Subsidiaries from competing in any line of
business.  Neither  it nor  any of its  Subsidiaries  is in  default  under  any
material contract, agreement,  commitment,  arrangement, lease, insurance policy
or other  instrument  to which it is a party,  by which its  respective  assets,
business, or operations may be bound or affected, and there has not occurred any
event  that,  with the lapse of time or the  giving  of  notice  or both,  would
constitute such a default, except for such defaults that, individually or in the
aggregate, would not reasonably be expected to have a Material Adverse Effect on
the Company.

     (k) No  Brokers.  No action has been taken by the  Company,  its  officers,
directors or employees that would give rise to any valid claim against any party
hereto for a  brokerage  commission,  finder's  fee or other like  payment  with
respect to the transactions contemplated by this Agreement, excluding fees to be
paid to William Blair & Company (the "Company Financial  Advisor") and to Blum &
Co., Inc. pursuant to the Company's written agreements with such firms, true and
complete  copies of which  agreements have been furnished to Nortel prior to the
date of this Agreement.

     (l) Employee Benefits; Employee Relations.

     (i) Section 5.01(l) of the Company Disclosure  Schedule contains a complete
and correct list of each Company Plan.  With respect to each Company Plan,  true
and complete  copies have been  provided to Nortel of: (i) the plan  document or
agreement or, with respect to any Company Plan that is not in writing, a written
description of the terms thereof;  (ii) the trust agreement,  insurance contract
or other  documentation  of any related funding  arrangement;  (iii) the summary
plan  description;  (iv) the most recent required  Internal Revenue Service Form
5500, including all schedules thereto; (v) any material communication to or from
any  Governmental  Authority,  including  a  written  description  of  any  oral
communication; and (vi) all amendments or modifications to any such document.

     (ii) Neither the Company nor any  Subsidiary  thereof has  disseminated  in
writing or otherwise  broadly or generally  notified  employees of any intent or
commitment  (whether  or  not  legally  binding)  to  create  or  implement  any
additional  Plan or to amend,  modify or terminate any Company Plan,  except for
immaterial amendments to any Company Plan that will not result in an increase in
the annual  costs in  respect of such plan  incurred  or to be  incurred  by the
Company or any of its Subsidiaries.

     (iii)  Except for any  failures  that would not  reasonably  be expected to
have,  individually  or in the  aggregate,  a  Material  Adverse  Effect  on the
Company,  each  Company  Plan has been  operated  and  administered,  and is, in
compliance  with its  terms  and all  applicable  laws,  rules  and  regulations
(including  ERISA  and the Code and any  regulations  thereunder).  There are no
actions,  suits,  claims or  governmental  audits (other than routine claims for
benefits in the ordinary  course)  pending or, to the  Knowledge of the Company,
threatened with respect to any Company Plan that would reasonably be expected to
have,  individually  or in the  aggregate,  a  Material  Adverse  Effect  on the
Company.

     (iv) No Company Plan is, and neither the Company nor any Subsidiary thereof
contributes to or has any material  liability or obligation  with respect to any
Plan that is, (A) a multiemployer  plan within the meaning of Section 4001(a)(3)
of ERISA, (B) any single employer plan or other pension plan subject to Title IV
or Section  302 of ERISA or Section  412 of the Code or (C) a multiple  employer
plan  within the meaning of Section  4063 or 4064 of ERISA.  Neither the Company
nor any  Subsidiary  thereof is a party to any  collective  bargaining  or other
collective labor agreement or understanding.

     (v) There is no pending or, to the  Knowledge  of the  Company,  threatened
labor dispute,  strike,  work stoppage or other concerted labor activity against
the  Company or any  Subsidiary  thereof or  involving  any of their  respective
employees.  To the  Knowledge  of the  Company,  neither  the  Company  nor  any
Subsidiary thereof,  nor their respective  businesses,  has committed any unfair
labor  practices or violated in any material  respect any applicable  employment
laws in  connection  with the  operation  of the  respective  businesses  of the
Company or any Subsidiary thereof,  and there is no pending or, to the Knowledge
of the Company, threatened charge or complaint against the Company or any of its
Subsidiaries  by the National  Labor  Relations  Board or any  comparable  state
agency, or by any employee or class of employees or governmental agency relating
to a purported violation of any applicable employment laws.

     (vi) Each Company  Plan that is intended to qualify  under  Section  401(a)
and/or  401(k) of the Code so  qualifies  and its trust is exempt from  taxation
under Section 501(a) of the Code. The Company and its  Subsidiaries  have timely
paid all  contributions,  premiums and expenses payable to or in respect of each
Company Plan under the terms  thereof and in  accordance  with  applicable  law,
including  ERISA  and the  Code,  and,  to the  extent  any such  contributions,
premiums or expenses are not yet due, the  liability  therefor has been properly
and adequately  accrued on the Company's  financial  statements  included in its
Quarterly Report on Form 10-Q for the period ended February 28, 1999.

     (vii) Neither the Company nor any of its  Subsidiaries has incurred or will
incur,   either   directly  or   indirectly   (including   as  a  result  of  an
indemnification  obligation),  any material  liability  under or pursuant to any
provision  of Title I or IV of ERISA or the  penalty,  excise  tax or joint  and
several liability provisions of the Code relating to employee benefit plans, and
to the  Knowledge  of the  Company,  no  event,  transaction  or  condition  has
occurred,  exists or is expected to occur which could  reasonably be expected to
result in any such material  liability to the Company,  any of its  Subsidiaries
or, after the Effective Time , Nortel or any of its Affiliates.

     (viii)  Except  as set forth in  Section  5.01(l)(viii)  of the  Disclosure
Schedule,  neither  the  execution  and  delivery  of  this  Agreement,  nor the
consummation  of  the  transactions  contemplated  hereby,  either  alone  or in
combination  with another  event  (whether  contingent  or  otherwise)  will (A)
entitle any current or former employee, consultant or director of the Company or
any of its  Subsidiaries  to any increased or modified  benefit or payment;  (B)
increase the amount of  compensation  due to any such  employee,  consultant  or
director;  (C) accelerate the vesting,  payment or funding of any  compensation,
stock-based  benefit,  incentive or other benefit;  (D) result in any "parachute
payment"  under  Section  280G of the  Code  (whether  or not  such  payment  is
considered to be reasonable  compensation for services  rendered);  or (E) cause
any  compensation to fail to be deductible  under Section  162(m),  or any other
provision of the Code or any similar foreign Law.

     (m)  Takeover  Laws.  The  Company  Board  (i) has  validly  approved  this
Agreement,  the  Option  Agreement  and  the  Stockholders'  Agreement  and  the
transactions contemplated hereby and thereby (including the Merger) for purposes
of  Section  203 of the DGCL and (ii) has taken all  steps  necessary  to render
Article  Ninth  of the  Company  Certificate  inapplicable  to the  transactions
contemplated  by this  Agreement.  Except for Section 203 of the DGCL (which has
been  rendered  inapplicable),  to the  Company's  Knowledge,  no  "moratorium",
"control share",  "fair price" or other antitakeover laws and regulations of any
state (collectively,  "Takeover Laws") are applicable to the Merger or the other
transactions  contemplated  by this  Agreement,  the  Option  Agreement  and the
Stockholders' Agreement.

     (n) Rights Agreement. The Company Board, by a duly enacted resolution,  has
determined  in good  faith  that  each of Nortel  and Sub shall be an  "Excluded
Person" for all purposes of the Company  Rights  Agreement (as  contemplated  by
Section 1(h) of such  Agreement) and, in connection  therewith,  has approved an
amendment  (in the form  provided  to Nortel  prior to the date  hereof)  to the
Company Rights Agreement to the effect that none of Nortel,  Sub or any of their
respective  affiliates  shall become an  "Acquiring  Person" and that no "Shares
Acquisition  Date" or  "Distribution  Date" (as such  terms are  defined  in the
Company Rights  Agreement) will occur as a result of the approval,  execution or
delivery of this Agreement, the Option Agreement, or the Stockholders' Agreement
or the  consummation of the  transactions  contemplated  hereby or thereby.  The
Company Rights  Agreement  shall  terminate and be of no further effect upon the
Effective  Time,  without  any  consideration  being  payable  with  respect  to
outstanding Company Stockholder Protection Rights thereunder.

     (o) Environmental Matters.

     (i) As used in this  Agreement,  "Environmental  Laws" means all applicable
local,  state,  provincial  and  federal  environmental,  health and safety laws
(including  common law) and regulations in effect on the date of this Agreement,
relating to the protection of human health and safety as affected by exposure to
pollutants,  contaminants, or hazardous or toxic wastes, substances or materials
and to the protection of the  environment  including,  without  limitation,  the
Resource   Conservation  and  Recovery  Act,  the  Comprehensive   Environmental
Response,  Compensation,  and  Liability  Act,  the Clean Water Act, the Federal
Clean Air Act,  and the  Occupational  Safety and Health  Act,  each as amended,
regulations promulgated thereunder, and state counterparts.

     (ii)  (x)  Neither  the  conduct  or  operations  of  the  Company  or  its
Subsidiaries  nor any condition of any property  presently or previously  owned,
leased or operated by any of them violates or, within the applicable  statute or
limitations period,  violated Environmental Laws, except for violations that are
not material and (y) no condition has existed or event has occurred with respect
to any of them or any such  property  that is  reasonably  likely to result in a
Material  Adverse  Effect on the  Company.  Neither  the  Company nor any of its
Subsidiaries  has received any written  notice from any  Governmental  Authority
that it or its  Subsidiaries  or the operation or condition of any property ever
owned,  leased,  operated,  held as  collateral or held as a fiduciary by any of
them are or were in  material  violation  of or  otherwise  are  alleged to have
material liability under any Environmental Law,  including,  but not limited to,
responsibility   (or  potential   responsibility)   for  the  cleanup  or  other
remediation  of any  pollutants,  contaminants,  or hazardous  or toxic  wastes,
substances or materials at, on, beneath, or originating from any such property.

     (iii) To the Company's  Knowledge,  none of the property  currently  owned,
leased or operated by the Company or by its  Subsidiaries is subject to, or as a
result of this transaction would be subject to, (i) the New Jersey Site Recovery
Act  or  any  other  state  or  local  Environmental  Laws  which  would  impose
restrictions,  such as notice, disclosure or obtaining advance approval prior to
this transaction, or (ii) any liens under any Environmental Laws.

     (p) Intellectual Property.

     (i) Except as set forth in Section  5.01(p)(i)  of the  Company  Disclosure
Schedule,  the  Company  and its  Subsidiaries  own or are  licensed  to use all
Intellectual  Property  Rights  currently used in the business of the Company or
its  Subsidiaries  or  necessary  to conduct the business of the Company and its
Subsidiaries  as currently  conducted or currently  anticipated  to be conducted
(the "Company Intellectual Property Rights").

     (ii) Section  5.01(p)(ii) of the Company  Disclosure  Schedule  contains an
accurate and  complete  list as of the date of this  Agreement of the  following
categories of Company  Intellectual  Property  Rights:  (A) Trademarks  that are
registered or for which an application for registration is pending; (B) Patents;
(C) Software; (D) Copyrights that are registered or for which an application for
registration is pending; and (E) mask works. Where listed Intellectual  Property
Rights are  registered  with a  governmental  authority  or an  application  for
registration is pending,  the jurisdiction,  registration or application number,
date  of  registration  or  application,   named  owner  and/or  assignee,   and
international classes of registration are indicated, as applicable.

     (iii) Section  5.01(p)(iii) of the Company Disclosure  Schedule contains an
accurate and complete list as of the date of this  Agreement of (A) all licenses
and agreements  under which the Company and its Subsidiaries are licensed to use
third party  Intellectual  Property  Rights and (B) all licenses and sublicenses
under  which the  Company  and its  Subsidiaries  have  granted  rights to third
parties to use the Company Intellectual  Property Rights. Except as set forth in
Section  5.01(p)(iii) of the Company  Disclosure  Schedule,  the Company and its
Subsidiaries are not required to pay any royalties, fees or other amounts to any
Person in connection with the use of the Company Intellectual Property Rights.

     (iv) The  Company  and its  Subsidiaries  have good and valid  title to all
Company  Intellectual  Property  Rights  owned  by any of  them  and  valid  and
enforceable  license  rights to all Company  Intellectual  Property  Rights used
under license,  free and clear, to the Company's  Knowledge,  of all Liens,  and
other  than as set  forth  in  Section  5.01(p)(iv)  of the  Company  Disclosure
Schedule,  to the Company's Knowledge,  all Company Intellectual Property Rights
are in full  force  and  effect  and  will  remain  in  full  force  and  effect
immediately following the Effective Time.

     (v) The Company and its  Subsidiaries  have a practice to secure,  and have
secured, from all consultants and contractors who contribute or have contributed
to the creation or development  of Company  Intellectual  Property  Rights valid
written  assignments by such persons to the Company and its  Subsidiaries of the
rights to such contributions the Company and its Subsidiaries do not already own
by operation of law. The Company and its Subsidiaries  have taken reasonable and
appropriate  steps to protect and preserve the  confidentiality  of all of their
Trade Secrets,  and to the Company's  Knowledge there are no unauthorized  uses,
disclosures or infringements of any Company  Intellectual  Property Rights,  and
all use by, and  disclosure  to, any Person of Trade  Secrets that  comprise any
part of the Company Intellectual  Property Rights has been pursuant to the terms
of a written  agreement  with such  Person,  and all use by the  Company and its
Subsidiaries  of Trade Secrets owned by another  Person has been pursuant to the
terms of a written  agreement with such Person or is otherwise  lawful.  Neither
the  Company  Intellectual  Property  Rights  nor the use or other  exploitation
thereof by the Company and its  Subsidiaries  (or any consultant,  contractor or
employee  of  the  Company  and  its  Subsidiaries  who  contributes  to or  has
contributed  to or  participated  in the  creation  or  development  of  Company
Intellectual Property Rights ) in the conduct of their business, nor any product
or  service  provided  by  the  Company  and  its  Subsidiaries,  infringes  on,
misappropriates,  breaches or violates  any third  party  Intellectual  Property
Rights.

     (vi) Neither the Company nor any of its Subsidiaries: (A) has been notified
or is otherwise  aware of any actual or  threatened  adverse  proceeding  of any
Person pertaining to any challenge to the scope,  validity or enforceability of,
or the Company's ownership of, any of the Company Intellectual  Property Rights;
(B) is the  subject  of any claim of  infringement  or  misappropriation  by the
Company or any of its  Subsidiaries  of any third  party  Intellectual  Property
Rights; or (C) has any claim for infringement or misappropriation  of, or breach
of any license or agreement involving,  any of the Company Intellectual Property
Rights.

     (q) Tax Matters.

     (i)(A) All returns, declarations,  reports, estimates,  information returns
and  statements  required  to be filed on or before  the  Effective  Date  under
federal, state, local or any foreign tax laws ("Tax Returns") with respect to it
or any of its  Subsidiaries,  have been or will be timely filed, or requests for
extensions  have been timely filed and have not expired,  except where a failure
or failures to so timely file would not,  individually  or in the aggregate,  be
expected to be material;  (B) all material Tax Returns  filed by it are complete
and accurate in all material respects; (C) all Taxes shown to be due and payable
(without  regard to whether  such Taxes have been  assessed) on such Tax Returns
have been paid or adequate  reserves  have been  established  for the payment of
such Taxes;  (D) the proper and  accurate  amounts have been  withheld  from all
employees  (and timely paid to the  appropriate  Governmental  Authority  or set
aside in an account for such purposes) for all periods  through the Closing date
in compliance in all material  respects with all Tax  withholding  provisions of
applicable   federal,   state,  local  and  foreign  laws  (including,   without
limitation,  income,  social  security,  and employment tax  withholding for all
types of compensation); (E) neither it nor any of its subsidiaries is a party to
any tax sharing or similar  agreement or any  agreement  pursuant to which it or
any of its  subsidiaries has an obligation to indemnify any party (other than it
or one of its  subsidiaries)  with  respect  to  Taxes;  (F) all  Taxes due with
respect to completed and settled  examinations or concluded  litigation relating
to it or any of its  subsidiaries  have been paid in full or  adequate  reserves
have been  established  for the payment  thereof;  and (G) no material  audit or
examination or refund litigation with respect to any Tax Return is pending.

     (ii) The Company has no reason to believe  that any  conditions  exist that
might prevent or impede the Merger from  qualifying as a  reorganization  within
the meaning of Section 368(a) of the Code.

     (r)  Regulatory  Approvals.  No  consents  or  approvals  of, or filings or
registrations with, any Governmental  Authority or instrumentality are necessary
to  consummate  the  Merger  except  (i) as may be  required  under,  and  other
applicable  requirements of, the Hart-Scott Rodino Antitrust Improvements Act of
1976, as amended (the "HSR Act"),  the Competition Act (Canada) and antitrust or
other  competition laws of other  jurisdictions;  (ii) as may be required by the
by-laws,  rules,  regulations  or policies of the  Canadian  Stock  Exchanges in
respect of the assumption by Nortel, and the  exercisability by the holders,  of
the Company  Stock Options and of the NYSE and the Canadian  Stock  Exchanges in
respect of the Nortel Common Shares to be issued in the Merger and upon exercise
of the Company Stock Options to be assumed by Nortel by reason of the Merger and
the  listing of such Nortel  Common  Shares on such stock  exchanges;  (iii) the
filing  with  the  SEC of  the  Company  Proxy  Statement  and  the  filing  and
declaration of effectiveness of the Registration Statement; (iv) the filing of a
certificate  of merger  with the  Secretary  of State of the  State of  Delaware
pursuant to the DGCL;  (v) such  filings as are required to be made or approvals
as are  required  to be  obtained  under the  securities  or "Blue  Sky" laws of
various  states in  connection  with the issuance of Nortel Common Shares in the
Merger;  (vi) such filings as are required to be made and  exemption  rulings or
orders as are required to be obtained under the Canada Business Corporations Act
and Canadian  securities laws; and (vii) as may be required under Section 721 of
the U.S. Defense  Production Act of 1950, as amended,  and the rules promulgated
thereunder ("Exon-Florio") and the rules and regulations promulgated by the U.S.
Department of Defense.

     (s) Fairness Opinion.  On or before the date hereof,  the Company Financial
Advisor has delivered  its opinion to the Company Board that the Exchange  Ratio
is fair,  from a financial point of view, to the holders of Company Common Stock
and such opinion has not been withdrawn.

     (t) Year 2000 Compliance.

     (i) Except as set forth in Section  5.01(t)(i)  of the  Company  Disclosure
Schedule,  all Material  Systems of the Company and its  Subsidiaries  have been
remediated  through  modification,  upgrade or  replacement so that they are (A)
able to receive, record, store, process, calculate,  manipulate and output dates
from and after  January 1, 2000,  time periods that include  January 1, 2000 and
information  that is dependent on or relates to such dates or time  periods,  in
the same manner and with the same  accuracy,  functionality,  data integrity and
performance  as when dates or time periods prior to January 1, 2000 are involved
and  (B)  able  to  store  and  output  date  information  in a  manner  that is
unambiguous as to century ("Year 2000 Compliant").

     (ii) To the  Company's  Knowledge,  the material  suppliers  and vendors of
goods and services to the Company and its  Subsidiaries  ("Material  Suppliers")
are taking, or will in a timely manner take, such steps as are necessary to make
their  respective  Material  Systems  Year 2000  Compliant by December 31, 1999,
except to the extent that the failure of any such  Material  Systems of Material
Suppliers  to  be  Year  2000  Compliant   would  not  reasonably  be  expected,
individually  or in the  aggregate,  to have a  Material  Adverse  Effect on the
Company.

     (iii) All Company application products shipped to customers since August 1,
1998, and all other Company  products  shipped to customers  since  September 1,
1998, are Year 2000  Compliant in all material  respects and have been tested by
the Company (including custom testing of all third-party manufactured content of
such Company products) to confirm such status.  With respect to Company products
shipped prior to such dates,  the Company and its  Subsidiaries  have undertaken
reasonable  efforts  to notify all  end-users  of such  products  of the need to
upgrade  such  products to be Year 2000  Compliant  and of the need to audit any
custom application  products to identify any respects in which they are not Year
2000 Compliant.

     (iv) The  Company  has  furnished  to  Nortel  copies  of, or copies of all
documents  relating  to,  (A) all  complaints,  investigations  or audits of any
Governmental  Authority,  (B) all  unresolved  customer  complaints,  demands or
claims (excluding routine requests for information regarding matters relating to
the year  2000  turnover),  (C) all  attorney  letters  or  demands  and (D) all
litigation,  arbitrations or similar  proceedings,  in each case insofar as they
relate  to the Year  2000  Compliant  status of  Company  products,  the cost of
upgrading  Company  products to a Year 2000  Compliant  status or  injuries  and
damages suffered as a result of the non-Year 2000 Compliant condition of Company
products.

     (v) The Company has  provided to Nortel  copies of its written  contingency
plan relating to  interruptions  to its business or the  functioning  of Company
products  caused  by the  year  2000  turnover,  and the  Company  has no  other
contingency  plans relating thereto.  (u) No Material Adverse Effect.  Since May
31,  1999,  and until the date  hereof,  the Company and its  Subsidiaries  have
conducted  their  respective  businesses in the ordinary  course  (excluding the
incurrence of reasonable and customary liabilities related to this Agreement and
the transactions  contemplated  hereby).  Since May 31, 1999, and until the date
hereof, no event has occurred or circumstance arisen that, individually or taken
together  with all other  facts,  circumstances  and  events  (described  in any
paragraph of Section 5.01 or otherwise), has had or is reasonably likely to have
a Material Adverse Effect with respect to the Company.

     5.02. Representations and Warranties of Nortel and Sub. Except as set forth
in the  disclosure  schedule  delivered  by Nortel to the  Company  prior to the
execution of this Agreement (the "Nortel Disclosure  Schedule") (each section of
which  qualifies the  correspondingly  numbered  representation  and warranty or
covenant to the extent specified  therein),  Nortel and Sub hereby represent and
warrant to the Company as follows:

     (a) Organization,  Standing and Authority.  Each of Nortel and Sub (x) is a
corporation  duly organized,  validly  existing and, in the case of Sub, in good
standing under the laws of the  jurisdiction of its organization and (y) is duly
qualified  to do  business  and,  as  applicable,  is in  good  standing  in the
provinces  of  Canada  and in  the  states  of the  United  States  and  foreign
jurisdictions  where its  ownership  or  leasing  of  property  or assets or the
conduct of its business requires it to be so qualified, except where the failure
to be duly organized, validly existing, in good standing, or duly qualified does
not have and would not  reasonably be expected to have,  individually  or in the
aggregate,  a Material  Adverse Effect on Nortel.  Each of Nortel and Sub has in
effect  all  federal,   provincial,   state,  local  and  foreign   governmental
authorizations necessary for it to own or lease its properties and assets and to
carry on its business as it is now  conducted,  except where  failure to have in
effect such authorizations does not have and would not reasonably be expected to
have,  individually  or in the aggregate,  a Material  Adverse Effect on Nortel.
Each of Nortel and Sub has made  available to the Company a complete and correct
copy of its  constitutive  documents,  each as amended to date and in full force
and effect.

     (b) Shares.

     (i) As of the date hereof,  the authorized capital stock of Nortel consists
solely  of  (A)  an  unlimited   number  of  Nortel  Common  Shares,   of  which
1,358,418,380  shares were  outstanding  as of August 17, 1999 (giving effect to
the  one-for-one  stock  dividend  effected by Nortel as of such  date);  (B) an
unlimited number of Class A Preferred Shares issuable in series, without nominal
or par value, of which 200 Cumulative Redeemable Class A Preferred Shares Series
4 (which are exchangeable at certain times,  and subject to certain  conditions,
into Nortel Common Shares),  16,000,000  Cumulative Redeemable Class A Preferred
Shares Series 5 (which are convertible at certain times,  and subject to certain
conditions,  into an equal  number of  Cumulative  Redeemable  Class A Preferred
Shares  Series 6) and  14,000,000  Non-cumulative  Redeemable  Class A Preferred
Shares Series 7 (which are convertible at certain times,  and subject to certain
conditions,  into an equal number of Non-cumulative Redeemable Class A Preferred
Shares Series 8) were  outstanding  as of August 17, 1999;  and (C) an unlimited
number of Class B Preferred Shares,  issuable in series,  without nominal or par
value, of which no shares were outstanding as of August 17, 1999. As of the date
hereof,  there are no  outstanding  Rights to acquire  capital stock from Nortel
other than  pursuant to Nortel's  stock option and other  employee  compensation
plans,  Nortel's shareholder  dividend  reinvestment and stock purchase plan and
the exchange rights associated with Nortel's Series 4 Preferred Shares that have
been Previously Disclosed.

     (ii) The  authorized  capital  stock of Sub consists of one share of common
stock,  $0.01 per share, which one share is outstanding and is owned directly by
Nortel.  Sub has not conducted any business  prior to the date hereof and has no
Subsidiaries and no assets,  liabilities or obligations of any nature other than
incident to its formation and incident to this Agreement.

     (iii) The outstanding  shares of Nortel's and Sub's capital stock have been
duly  authorized  and  are  validly  issued  and  outstanding,  fully  paid  and
nonassessable,  and  subject  to no  preemptive  rights  (and were not issued in
violation of any preemptive rights). As of the date hereof,  there are no shares
of capital  stock of Sub  authorized  and reserved for issuance and Sub does not
have any Rights issued or  outstanding  with respect to its capital stock or any
commitment  to  authorize,  issue or sell  any such  shares  or  Rights,  except
pursuant to this Agreement.

     (iv) The  Nortel  Common  Shares  to be issued in  exchange  for  shares of
Company  Common Stock in the Merger or upon exercise of Company Stock Options to
be  assumed  by  Nortel  by  reason  of the  Merger,  when  issued  will be duly
authorized,  validly issued, fully paid and nonassessable and will not have been
issued in violation of any subscriptive or preemptive rights.

     (c) Corporate  Power.  Each of Nortel and Sub has the  corporate  power and
authority to carry on its business as it is now being  conducted  and to own all
its  properties and assets;  and each of Nortel and Sub has the corporate  power
and  authority  to  execute,  deliver and  perform  its  obligations  under this
Agreement and, in the case of Nortel, the Option Agreement and to consummate the
transactions contemplated hereby and, in the case of Nortel, thereby.

     (d)  Corporate   Authority.   (i)  This  Agreement  and  the   transactions
contemplated  hereby,  including  the  issuance of Nortel  Common  Shares in the
Merger or upon the exercise of Company  Stock Options to be assumed by Nortel by
reason of the Merger, and the Option Agreement and the transactions contemplated
thereby,  as  applicable,  have been  authorized  and approved by all  necessary
corporate action of Nortel (no shareholder  approvals being required),  Sub, the
Nortel Board and the Board of  Directors of Sub prior to the date hereof  (which
action  has not been  rescinded  or  modified  in any way) and (ii) each of this
Agreement and, in the case of Nortel,  the Option Agreement,  is a legal,  valid
and binding agreement of each of Nortel and Sub,  enforceable in accordance with
its  terms  (except  as  such   enforceability  may  be  limited  by  applicable
bankruptcy,  insolvency,  reorganization,  moratorium,  fraudulent  transfer and
similar laws of general applicability relating to or affecting creditors' rights
or by general equity principles, whether considered at law or in equity).

     (e) No  Defaults.  Subject  to  receipt of the  regulatory  approvals,  and
expiration  of the  waiting  periods,  referred  to in Section  5.02(i)  and any
required  filings under federal,  state and provincial  securities  laws and the
Canada  Business  Corporations  Act, the execution,  delivery and performance of
this Agreement and, as applicable,  the Option Agreement and the consummation of
the transactions  contemplated hereby and, as applicable,  thereby by Nortel and
Sub do not and will not (i)  constitute a material  breach or violation of, or a
material  default  under,  any law, rule or regulation or any judgment,  decree,
order, governmental permit or license, or agreement,  indenture or instrument of
Nortel  or of  any  of  Nortel's  Subsidiaries  or to  which  it or  any  of its
Subsidiaries  or any of their  respective  properties  or assets are  subject or
bound,  (ii)  constitute  a breach or  violation  of, or a  default  under,  the
articles or certificate of  incorporation or by-laws of either Nortel or Sub, or
(iii)  require  any  consent or  approval  under any such  material  law,  rule,
regulation,  judgment, decree, order, governmental permit or license, agreement,
indenture or instrument, except in the case of (i) and (iii), where such breach,
violation or default or the failure to obtain such  consents or approvals  would
not  in the  aggregate  have a  Material  Adverse  Effect  on the  Company,  the
Surviving  Corporation  or Nortel  and would not  prevent or  materially  impair
Nortel's ability to consummate the transactions contemplated by this Agreement.

     (f) Financial  Reports and SEC Documents.  Nortel's  Annual Reports on Form
10-K for the fiscal years ended December 31, 1996,  1997 and 1998, its Quarterly
Reports on Form 10-Q for the periods ended March 31, 1999 and June 30, 1999, and
all other reports or registration statements,  filed or to be filed by it or any
of its Subsidiaries subsequent to December 31, 1996 under the Securities Act, or
under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act, in the form filed,
or to be filed (collectively,  the "Nortel SEC Documents"),  with the SEC, as of
the date filed (A) complied or will comply in all  material  respects as to form
with the applicable  requirements  under the Securities Act or the Exchange Act,
as the case may be; and (B) did not and will not contain any untrue statement of
a material fact or omit to state a material  fact required to be stated  therein
or necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading;  and each of the balance sheets  contained
in or incorporated by reference into any such Nortel SEC Document (including the
related notes and schedules thereto) fairly presents and will fairly present the
financial position of the entity or entities to which it relates as of its date,
and each of the  statements  of income and changes in  stockholders'  equity and
cash flows or equivalent  statements in such Nortel SEC Documents (including any
related notes and schedules thereto) fairly presents and will fairly present the
results of  operations,  changes  in  stockholders'  equity and  changes in cash
flows, as the case may be, of the entity or entities to which it relates for the
periods to which they relate,  in each case in  accordance  with  Canadian  GAAP
consistently  applied during the periods involved and Regulation S-X of the SEC,
except in each case as may be noted  therein,  subject to normal  year-end audit
adjustments in the case of unaudited statements. The books and records of Nortel
and its  Subsidiaries  have been,  and are  being,  maintained  in all  material
respects in accordance  with Canadian  GAAP and any other  applicable  legal and
accounting requirements and reflect only actual transactions.

     (g) Litigation.  Except as Previously  Disclosed,  no litigation,  claim or
other proceeding before any court or governmental  agency that is pending or, to
Nortel's  Knowledge,  threatened against Nortel or any of its Subsidiaries would
reasonably be expected to have,  individually  or in the  aggregate,  a Material
Adverse Effect on Nortel.

     (h) No Brokers.  No action has been taken by it that would give rise to any
valid claim against any party hereto for a brokerage commission, finder's fee or
other  like  payment  with  respect  to the  transactions  contemplated  by this
Agreement, excluding fees to be paid to Credit Suisse First Boston.

     (i)  Regulatory  Approvals.  No  consents  or  approvals  of, or filings or
registrations  with,  any  Governmental  Authority  or with any third  party are
necessary to consummate the Merger except for (i) as may be required under,  and
other applicable  requirements of, the HSR Act and the Competition Act (Canada);
(ii) as may be required by the by-laws,  rules,  regulations  or policies of the
Canadian  Stock  Exchanges  in respect  of the  assumption  by  Nortel,  and the
exercisability by the holders,  of the Company Stock Options and of the NYSE and
the Canadian Stock Exchanges in respect of the Nortel Common Shares to be issued
in the Merger and upon the exercise of the Company  Stock  Options to be assumed
by Nortel by reason of the Merger and the listing of such Nortel  Common  Shares
on such stock  exchanges;  (iii) the filing  with the SEC of the  Company  Proxy
Statement in definitive form and the filing and declaration of  effectiveness of
the Registration Statement;  (iv) the filing of a certificate of merger with the
Secretary  of State of the State of  Delaware  pursuant  to the  DGCL;  (v) such
filings as are  required to be made or  approvals as are required to be obtained
under the securities or "Blue Sky" laws of various states in connection with the
issuance  of Nortel  Common  Shares in the  Merger;  (vi)  such  filings  as are
required  to be made and  exemption  rulings  or  orders as are  required  to be
obtained  under the Canada  Business  Corporations  Act and Canadian  securities
laws;  and  (vii)  as may be  required  under  Exon-Florio  and  the  rules  and
regulations promulgated by the U.S. Department of Defense.

     (j) No Material  Adverse  Effect.  Since December 31, 1998,  until the date
hereof, no event has occurred or circumstance arisen that, individually or taken
together  with all other  facts,  circumstances  and  events  (described  in any
paragraph of Section 5.02 or otherwise), has had or is reasonably likely to have
a Material Adverse Effect with respect to Nortel.

     (k)  Taxes.  Nortel  has not taken or agreed  to take any  action  with the
Knowledge  that  such  action  would,  or  failed  to take any  action  with the
Knowledge  that the omission of such action would,  prevent or impede the Merger
from qualifying as a reorganization  within the meaning of Section 368(a) of the
Code.  Nortel has no Knowledge of any facts or  circumstances  that would,  with
respect  to the  Merger,  prevent  Nortel  from being  treated as a  corporation
pursuant  to Section  367 of the Code or the  Treasury  regulations  promulgated
thereunder.

                                   ARTICLE VI

                                    COVENANTS

                  The Company  hereby  covenants to and agrees with Nortel,  and
each of Nortel and Sub hereby covenants to and agrees with the Company, that:

     6.01. Reasonable Best Efforts.  Subject to the terms and conditions of this
Agreement,  it shall use its  reasonable  best efforts in good faith to take, or
cause to be  taken,  all  actions,  and to do, or cause to be done,  all  things
necessary,  proper or  desirable  (including  obtaining  any  consents  of third
parties  required  under any agreement to be obtained by it or its  subsidiaries
prior  to,  or as a result  of,  the  consummation  of the  Merger  so that such
agreement  is not  terminable  as a result of the Merger),  or  advisable  under
applicable  laws,  so as to permit  consummation  of the Merger as  promptly  as
practicable   and  otherwise  to  enable   consummation   of  the   transactions
contemplated  hereby and shall  cooperate  fully with the other party  hereto to
that end. In case at any time after the  Effective  Time any  further  action is
necessary or desirable to carry out the purpose of this Agreement or to vest the
Surviving  Corporation  with  full  title  to all  properties,  assets,  rights,
approvals,  immunities and  franchises of any of the parties to the Merger,  the
proper  officers  and  directors  of each  party  to this  Agreement  and  their
respective  Subsidiaries  shall  take  all  such  necessary  action  as  may  be
reasonably requested by, and at the sole expense of, Nortel.

     6.02.  Stockholder  Approvals.  The Company shall take, in accordance  with
this  Agreement,  applicable  law,  applicable NASD rules and its certificate of
incorporation  and  by-laws,  all action  necessary  to  convene an  appropriate
meeting of  stockholders  of the Company to consider  and vote upon the approval
and adoption of the  "agreement  of merger" (as such term is used in Section 251
of the DGCL)  contained in this  Agreement  and the Merger and any other matters
required to be approved by the Company's  stockholders  for  consummation of the
Merger  (including any adjournment or  postponement,  the "Company  Meeting") as
promptly as practicable.  The Company Board,  subject to Section 6.06,  shall at
all times recommend such approval and shall take all reasonable lawful action to
solicit such approval by its stockholders.

     6.03. Registration Statement.  (a) Each of Nortel and the Company agrees to
cooperate  in the  preparation  of a  registration  statement  on Form  S-4 (the
"Registration  Statement") to be filed by Nortel with the SEC in connection with
the  issuance  of  Nortel  Common  Shares  in the  Merger  (including  the proxy
statement and prospectus and other proxy  solicitation  materials of the Company
constituting  a part thereof (the  "Company  Proxy  Statement")  and all related
documents).  The  Registration  Statement and the Company Proxy  Statement shall
comply as to form in all material respects with the applicable provisions of the
Securities  Act and the Exchange Act and the rules and  regulations  thereunder.
Provided the other party has cooperated as required above, the Company agrees to
file the Company Proxy Statement in preliminary form with the SEC as promptly as
practicable,  and Nortel agrees to file the Registration  Statement with the SEC
as  promptly  as  practicable  after  any  SEC  comments  with  respect  to  the
preliminary  Proxy  Statement are resolved or at such earlier time as Nortel may
elect.  Each of Nortel and the Company shall,  as promptly as practicable  after
receipt thereof,  provide copies of any written  comments  received from the SEC
with respect to the Registration  Statement and the Company Proxy Statement,  as
the case may be, to the other  party,  and  advise  the other  party of any oral
comments  with  respect  to the  Registration  Statement  or the  Company  Proxy
Statement  received from the SEC.  Each of Nortel and the Company  agrees to use
reasonable  best  efforts to cause the  Registration  Statement  to be  declared
effective  under the  Securities  Act as promptly as  practicable  after  filing
thereof,  and the Company  agrees to mail the  Company  Proxy  Statement  to its
shareholders  as promptly as  practicable  after the  Registration  Statement is
declared effective.  Nortel also agrees to use reasonable best efforts to obtain
all necessary state securities law or "Blue Sky" permits and approvals  required
to carry out the transactions contemplated by this Agreement. The Company agrees
to furnish to Nortel all information  concerning the Company,  its Subsidiaries,
officers,   directors  and  stockholders  as  may  be  reasonably  requested  in
connection with the foregoing.

     (b)  Each  of  Nortel  and  the  Company  agrees,  as  to  itself  and  its
Subsidiaries,  that none of the information supplied or to be supplied by it for
inclusion or incorporation by reference in (i) the Registration  Statement will,
at the time the Registration Statement and each amendment or supplement thereto,
if any, becomes effective under the Securities Act, contain any untrue statement
of a material  fact or omit to state any  material  fact  required  to be stated
therein or necessary to make the statements  therein not misleading and (ii) the
Company Proxy  Statement  and any  amendment or supplement  thereto will, at the
date of mailing to stockholders and at the time of the Company Meeting,  contain
any untrue  statement  of a  material  fact or omit to state any  material  fact
required to be stated  therein or necessary to make the statements  therein,  in
light of the circumstances in which they were made, not misleading.

     (c) Nortel  agrees to advise the Company,  promptly  after Nortel  receives
notice thereof, of the time when the Registration Statement has become effective
or any supplement or amendment has been filed, of the issuance of any stop order
or the suspension of the  qualification of the Nortel Common Shares for offering
or sale in any  jurisdiction,  of the initiation or threat of any proceeding for
any such  purpose,  or of any request by the SEC for the amendment or supplement
of the Registration Statement or for additional information.

     (d) Nortel will use its reasonable best efforts to obtain, and will provide
evidence  reasonably  satisfactory to the Company,  of all necessary  rulings or
orders of Canadian securities regulatory  authorities exempting the distribution
by Nortel of the Nortel  Common  Shares and  options to purchase  Nortel  Common
Shares under the Merger and the resale of Nortel  Common Shares issued under the
Merger in Canada as  contemplated  by this Agreement from the  registration  and
prospectus  requirements  under  applicable  Canadian  securities  laws on terms
reasonably satisfactory to Nortel and the Company.

     6.04.  Press  Releases.  Nortel and the Company  shall  jointly agree on an
initial press release with respect to the transactions  contemplated  hereby and
in  compliance  with  applicable  law. The Company  will not,  without the prior
approval  of Nortel,  issue any other  press  release or written  statement  for
general  circulation  (including any written statement  circulated to employees,
customers  or other third  parties)  relating to the  transactions  contemplated
hereby,  except,  based on the  advice of  counsel,  as  otherwise  required  by
applicable law or regulation or NASD rules and only after  consulting,  or using
its reasonable best efforts to consult, with Nortel.

     6.05.  Access;  Information.  (a) Upon  reasonable  notice  and  subject to
applicable  laws  relating to the  exchange of  information,  the Company  shall
afford to the officers,  employees,  counsel,  accountants and other  authorized
representatives  of Nortel,  reasonable  access,  during normal  business  hours
throughout  the period prior to the Effective  Date,  to all of its  properties,
books,  contracts,  commitments  and records and,  during such period,  it shall
furnish  promptly to Nortel (i) a copy of each  material  report,  schedule  and
other  document  filed by it  pursuant to the  requirements  of federal or state
securities  laws,  and (ii)  all  other  information  concerning  the  business,
properties and personnel of it as Nortel may reasonably  request;  provided that
such  information may not be used for any purpose  unrelated to the consummation
of the transactions  contemplated by this Agreement.  The Company shall promptly
inform Nortel of any material  litigation,  claim or other proceeding before any
court or other  governmental  authority  that arises  following the date of this
Agreement and any material development in any such existing material litigation,
claim or  other  proceeding.  The  Company  and its  Subsidiaries  shall  not be
required to provide  access to or to disclose  information  where such access or
disclosure would contravene any law, rule, regulation,  order, judgment,  decree
or  agreement.   Nortel  and  the  Company  shall  make  appropriate  substitute
disclosure  arrangements  under  circumstances  in which the restrictions of the
preceding sentence apply.

     (b) Subject to the requirements of applicable law, pending  consummation of
the Merger,  all  non-public  information  provided by the Company to Nortel and
Nortel to the  Company  pursuant  to this  Agreement  or  otherwise  will remain
subject to the  obligations of Nortel and the Company under the  Confidentiality
Agreement.

     (c)  No  investigation  by a  party,  pursuant  to  this  Section  6.05  or
otherwise, shall affect or be deemed to modify any representation or warranty of
the other party contained herein.

     6.06. Acquisition Proposals. (a) The Company shall not, and shall cause its
Subsidiaries and the officers, directors, agents and advisors of the Company and
its Subsidiaries not to, initiate,  solicit or encourage  inquiries or proposals
with  respect  to, or engage in any  negotiations  concerning,  or  provide  any
confidential  information to, or have any discussions  with, any person relating
to, any Acquisition Proposal.  Notwithstanding the foregoing,  the Company shall
be permitted to engage in any discussions or  negotiations  with, or provide any
information  to,  any  Person in  response  to a bona fide  written  Acquisition
Proposal  by any such  Person,  if and only to the extent that in each such case
such proposal was not solicited or encouraged in violation of this Agreement and
(i) the  Company  Meeting  shall  not  have  occurred;  (ii) the  Company  Board
determines in good faith that such  Acquisition  Proposal would, if consummated,
constitute a Superior Proposal and is reasonably likely to be consummated; (iii)
the Company  Board  determines,  in good faith after  consultation  with outside
counsel,  that such  action is  legally  required  as a matter of the  fiduciary
duties of the directors  under  applicable  law; and (iv) prior to providing any
information or data to any Person or entering into  discussions or  negotiations
with  any   Person,   the  Company   receives   from  such  Person  an  executed
confidentiality  agreement  containing terms no less restrictive with respect to
such  Person than the terms of the  Confidentiality  Agreement  with  respect to
Nortel.  The Company  shall notify Nortel  promptly,  but in any event within 24
hours,  of any such  inquiries,  proposals,  or  offers  received  by,  any such
information requested from, or any such discussions or negotiations sought to be
initiated  or  continued  with,  any  of  its  representatives   indicating,  in
connection with such notice,  the name of such Person and the material terms and
conditions  of any  proposals  or offers.  For the  purposes of this  Agreement,
"Superior  Proposal"  shall mean any bona fide  Acquisition  Proposal  made by a
third party that was not solicited or encouraged in violation of this  Agreement
and which the Company Board  determines in its good faith judgment (based on the
written opinion to such effect by a financial  advisor of nationally  recognized
reputation) to be materially  more favorable to the  stockholders of the Company
than  the  transactions  contemplated  by  this  Agreement.  the  Company  shall
immediately  cease and cause to be terminated  any  activities,  discussions  or
negotiations  conducted  prior to the date of this  Agreement  with any  parties
other than Nortel with respect to any  Acquisition  Proposal.  The Company shall
advise  Nortel of any material  developments  with respect to any proposal as to
which the Company is exercising  its rights  pursuant to the second  sentence of
this Section 6.06 promptly upon the occurrence thereof.

     (b) Subject to Section  8.01  (e)(ii),  neither  the Company  Board nor any
committee  thereof  shall (i)  withdraw  or modify,  or propose to  withdraw  or
modify,  in a  manner  adverse  to  Nortel,  the  approval  and  declaration  of
advisability  by the Company Board of the "agreement of merger" (as such term is
used in Section 251 of the DGCL) contained in this Agreement notwithstanding any
withdrawal  by the Company  Board of its  recommendation  of such  "agreement of
merger"  (whether or not  permitted by  subsection  (c) below),  (ii) approve or
recommend, or propose to approve or recommend,  any Acquisition Proposal,  (iii)
cause the Company or any of its Subsidiaries to enter into any letter of intent,
agreement in principle, acquisition agreement, merger agreement or other similar
agreement  with  respect  to any  Acquisition  Proposal  or (iv)  other  than in
accordance with subsection (c) below, withdraw or modify, in a manner adverse to
Nortel,  or fail to make, the  recommendation  to Company  stockholders  of such
"agreement of merger."

     (c)  Notwithstanding  subsection  (b)(iv) above, but subject to subsections
(b)(i)-(iii)  above in the event (but only in the event) that the Company  Board
determines in good faith, after consultation with outside counsel,  that, having
received a Superior Proposal, such action is legally required as a matter of the
fiduciary  duties of the directors  under  applicable law, the Company Board may
withdraw or modify its recommendation to Company  stockholders of the "agreement
of merger" contained in this Agreement (or not recommend it in the Company Proxy
Statement),  but only at a time that is after the third  Business Day  following
Nortel's  receipt of written notice  advising  Nortel that the Company Board has
received a proposal  which may be a Superior  Proposal,  specifying the material
terms and  conditions  of such proposal and  identifying  the Person making such
proposal.

     (d)  Nothing in this  Section  6.06 shall (i)  prohibit  the  Company  from
complying,  to the extent applicable,  with Rules 14d-9 and 14e-2(a) promulgated
under the Exchange Act with  respect to an  Acquisition  Proposal or (ii) permit
the Company to violate its obligations under the first sentence of Section 6.02.

     6.07. Affiliate  Agreements.  (a) Not later than the mailing of the Company
Proxy  Statement,  the Company shall deliver to Nortel a schedule of each person
that, to the best of its knowledge,  is or is reasonably likely to be, as of the
date of the Company Meeting, deemed to be an "affiliate" of it (each, a "Company
Affiliate")  as  that  term  is  used in Rule  145  under  the  Securities  Act.
Thereafter,  the Company shall promptly notify Nortel upon becoming aware of any
other  person  that is or is  reasonably  likely  to be,  as of the  date of the
Company Meeting, deemed to be a Company Affiliate.

     (b) The Company shall use its reasonable  best efforts to cause each person
who may be deemed to be a Company  Affiliate to execute and deliver to Nortel on
or before the date of mailing of the Company Proxy Statement (or, in the case of
any  person  identified  as a possible  Company  Affiliate  after such date,  as
promptly  thereafter  as possible) an agreement in the form  attached  hereto as
Exhibit A.

     6.08.  Takeover  Laws.  Subject to Section  6.06,  no party  shall take any
action that would cause the  transactions  contemplated by this  Agreement,  the
Option Agreement,  and the Stockholders' Agreement to be subject to requirements
imposed by any  Takeover  Law and each of them shall  take all  necessary  steps
within its control to exempt (or ensure the continued exemption of), or minimize
the effect on, the  transactions  contemplated  by this Agreement and the Option
Agreement from, or if necessary  challenge the validity or applicability of, any
applicable  Takeover  Law, as now or  hereafter  in effect,  including,  without
limitation,  Section 203 of the DGCL or any other  Takeover Laws that purport to
apply to this Agreement or the Option Agreement or the transactions contemplated
hereby or thereby.

     6.09.  The  Company  Rights  Agreement.  The  Company  Board shall take all
further  action (in addition to that referred to in Section  5.01(n))  necessary
(including redeeming the Company Stockholder Protection Rights immediately prior
to the  Effective  Time or amending the Company  Rights  Agreement)  in order to
render the Company Stockholder  Protection Rights inapplicable to the Merger and
the other transactions contemplated by this Agreement, the Option Agreement, and
the Stockholders'  Agreement.  The Company Board shall take no action (including
redeeming  the Company  Stockholder  Protection  Rights or amending  the Company
Rights Agreement) in order to render the Company  Stockholder  Protection Rights
inapplicable in connection with any Acquisition Proposal.

     6.10. Shares Listed.  Nortel shall use its reasonable best efforts to list,
prior to the  Effective  Date,  on the NYSE and the  Canadian  Stock  Exchanges,
subject to official notice of issuance, the Nortel Common Shares to be issued to
the holders of Company  Common Stock in the Merger and upon  exercise of Company
Stock Options to be assumed by Nortel by reason of the Merger.

     6.11.  Regulatory  Applications.  (a)  Nortel  and the  Company  and  their
respective Subsidiaries shall cooperate and use their respective reasonable best
efforts (i) to prepare  all  documentation,  to effect all  filings  (including,
without limitation,  filings under the HSR Act and the Competition Act (Canada))
and to obtain all permits,  consents,  approvals and authorizations of all third
parties and  Governmental  Authorities  necessary to consummate the transactions
contemplated by this Agreement and (ii) to cause the Merger to be consummated as
expeditiously  as reasonably  practicable.  Each of Nortel and the Company shall
have the right to review in  advance,  and to the extent  practicable  each will
consult with the other,  in each case subject to applicable laws relating to the
exchange of  information,  with  respect to, all  material  written  information
submitted to any third party or any  Governmental  Authority in connection  with
the  transactions  contemplated by this  Agreement.  In exercising the foregoing
right,  each of the parties  hereto agrees to act  reasonably and as promptly as
practicable.  Each party hereto agrees that it will consult with the other party
hereto  with  respect  to the  obtaining  of  all  material  permits,  consents,
approvals and  authorizations of all third parties and Governmental  Authorities
necessary or advisable  to  consummate  the  transactions  contemplated  by this
Agreement  and each party will keep the other  party  apprised  of the status of
material matters relating to completion of the transactions contemplated hereby.

     (b) Each party agrees,  upon  request,  to furnish the other party with all
information  concerning  itself,  its  Subsidiaries,   directors,  officers  and
stockholders and such other matters as may be reasonably  necessary or advisable
in connection  with any filing,  notice or  application  made by or on behalf of
such other party or any of its  Subsidiaries  to any third party or Governmental
Authority.

     (c) In  furtherance  and not in  limitation of the covenants of the parties
contained  in Sections  6.11(a) and (b), if any  objections  are  asserted  with
respect to the transactions  contemplated  hereby under any Regulatory Law or if
any suit is  instituted  or  threatened  by any  Governmental  Authority  or any
private  party  challenging  any  of the  transactions  contemplated  hereby  as
violative of any  Regulatory  Law,  each of Nortel and the Company shall use its
reasonable  best  efforts to resolve any such  objections  or  challenge as such
Governmental Authority or private party may have to such transactions under such
Regulatory Law so as to permit consummation of the transactions  contemplated by
this  Agreement,  and if any  administrative  or judicial  action or proceeding,
including any proceeding by a private party,  is instituted (or threatened to be
instituted)  challenging  any  transaction  contemplated  by this  Agreement  as
violative of any Regulatory  Law, each of Nortel and the Company shall cooperate
in all respects with each other and use its respective  reasonable  best efforts
to contest and resist any such action or proceeding and to have vacated, lifted,
reversed or overturned any decree, judgment,  injunction or other order, whether
temporary,  preliminary or permanent, that is in effect and prohibits,  prevents
or restricts  consummation of the  transactions  contemplated by this Agreement.
Notwithstanding the foregoing or any other provision of this Agreement,  nothing
in this Section 6.11 shall limit a party's  right to  terminate  this  Agreement
pursuant  to Section  7.01(b)  or 8.01(d) so long as such party has  theretofore
complied in all respects with its obligations under this Section 6.11.

     (d) Nothing  contained in this Agreement shall require Nortel or any of its
Subsidiaries to sell or otherwise  dispose of, or to hold separately,  or permit
the sale or other  disposition  of, any assets of Nortel,  the  Company or their
respective  Subsidiaries,  or require  Nortel to refrain  from  exercising  full
authority  over the  Company  and its  Subsidiaries  after the  Effective  Time,
whether as a condition to obtaining any approval from a  Governmental  Authority
or any  other  Person  or for  any  other  reason.  6.12.  Indemnification.  (a)
Following  the  Effective  Date  and  until  the  expiration  of any  applicable
statutory limitations period, the Surviving Corporation shall indemnify,  defend
and hold  harmless the present and former  directors and officers of the Company
and its  Subsidiaries  (each,  an  "Indemnified  Party")  against  all  costs or
expenses  (including  reasonable  attorneys' fees),  judgments,  fines,  losses,
claims,  damages or liabilities  (collectively,  "Costs") incurred in connection
with any claim,  action,  suit,  proceeding  or  investigation,  whether  civil,
criminal,  administrative or investigative,  arising out of actions or omissions
occurring at or prior to the Effective Time (including,  without limitation, the
transactions  contemplated  by this  Agreement and the Option  Agreement) to the
fullest  extent that the Company is  permitted to indemnify  its  directors  and
officers under the laws of the State of Delaware,  the Company  Certificate  and
the  Company's  by-laws  as in  effect  on the date  hereof  (and the  Surviving
Corporation  shall also  advance  expenses as  incurred  to the  fullest  extent
permitted under applicable law).

     (b) For a period of six years from the Effective Time, Nortel shall provide
a "runoff"  policy with  respect to that  portion of  director's  and  officer's
liability  insurance  that serves to cover the present and former  officers  and
directors of the Company and its  Subsidiaries  (determined  as of the Effective
Time) with respect to claims  against such  directors and officers  arising from
facts or events which occurred at or before the Effective  Time,  which "runoff"
insurance  shall contain at least the same maximum  coverage and amounts to such
officers and directors,  and contain terms and conditions no less  advantageous,
as that coverage currently provided by the Company;  provided,  however, that in
no event shall Nortel be required to expend to maintain or obtain the  insurance
called for by this Section  6.12(b) more than 200 percent of the current  annual
amount  expended  by the  Company to  maintain  or procure  such  directors  and
officers  insurance  coverage  for the current  year (the  "Insurance  Amount");
provided,  further, that if Nortel is unable to maintain or obtain the insurance
called for by this Section 6.12(b), Nortel shall use its reasonable best efforts
to obtain as much comparable insurance as is available for the Insurance Amount;
provided,  further, that officers and directors of the Company or any Subsidiary
of the  Company  may be  required  to make  application  and  provide  customary
representations  and warranties to Nortel's insurance carrier for the purpose of
obtaining such insurance.

     (c) Any Indemnified  Party wishing to claim  indemnification  under Section
6.12(a),  upon learning of any claim, action, suit,  proceeding or investigation
described  above,  shall  promptly  notify Nortel  thereof;  provided,  that the
failure so to notify shall not affect the  obligations  of Nortel under  Section
6.12(a)  unless and to the extent such  failure  materially  increases  Nortel's
liability under such subsection (a).

     (d) If Nortel or any of its successors or assigns shall consolidate with or
merge into any other entity and shall not be the continuing or surviving  entity
of such  consolidation or merger or shall transfer all or  substantially  all of
its assets to any entity,  then and in each case, proper provision shall be made
so that the  successors and assigns of Nortel shall assume the  obligations  set
forth in this Section 6.12.

     6.13. Certain Employee Benefit Matters.  (a) For the one year period ending
on the first anniversary of the Effective Date (the "Continuation  Period"), the
Surviving Corporation shall, or shall cause its Subsidiaries to, (i) pay to each
of their respective  employees,  during any portion of the  Continuation  Period
that  such  employee  is  employed  by the  Surviving  Corporation  or any  such
Subsidiary, an annual salary or hourly wage rate, as applicable, that is no less
than the annual salary or hourly wage rate payable to such employee  immediately
prior to the Effective Time and (ii) provide such employee in the aggregate with
employee  benefits,  during any  portion of the  Continuation  Period  that such
employees are employed by the Surviving Corporation or any such Subsidiary, that
are substantially  similar in the aggregate to the employee benefits provided to
such employees  pursuant to the Company Plans (other than equity based benefits)
immediately prior to the Effective Time. Without limiting the foregoing,  during
the Continuation  Period,  the Surviving  Corporation and its Subsidiaries shall
continue to maintain  without  modification  those  Company  Plans that  provide
severance  benefits  and that are  listed  on  Section  6.13(a)  of the  Company
Disclosure  Schedule.  Notwithstanding  any other provision herein,  none of the
Surviving  Corporation,  any  of  its  Subsidiaries  or  Nortel  will  have  any
obligation  to  continue  the  employment  of any such  employee  for any period
following the Effective Time.

     (b) With respect to the Plans,  if any, of Nortel in which employees of the
Company or its Subsidiaries ("Company Employees") become eligible to participate
after the Effective Time (the "Nortel Plans"),  Nortel shall, or shall cause the
Surviving Corporation to: (i) with respect to each Nortel Plan that is a medical
or health plan, (x) waive any exclusions for pre-existing  conditions under such
Nortel Plan that would result in a lack of coverage for any  condition for which
the applicable  Company  Employee would have been entitled to coverage under the
corresponding  Company  Plan  in  which  such  Company  Employee  was an  active
participant  immediately  prior to his or her transfer to the Nortel  Plan;  (y)
waive any waiting  period  under such Nortel Plan to the extent that such period
exceeds the corresponding waiting period under the corresponding Company Plan in
which such Company Employee was an active  participant  immediately prior to his
or her transfer to the Nortel Plan (after taking into account the service credit
provided for herein for purposes of  satisfying  such waiting  period);  and (z)
provide each Company  Employee with credit for any  co-payments  and deductibles
paid by such  Company  Employee  prior to his or her transfer to the Nortel Plan
(to the same extent such credit was given under the analogous Company Plan prior
to such  transfer) in satisfying  any  applicable  deductible  or  out-of-pocket
requirements  under  such  Nortel  Plan for the plan  year  that  includes  such
transfer;  and (ii)  recognize  all  service of the Company  Employees  with the
Company or any of its  Subsidiaries  for purposes of eligibility to participate,
vesting  credit,  entitlement to benefits,  and, solely with respect to vacation
and severance benefits,  benefit accrual in any Nortel Plan in which the Company
Employees are eligible to participate  after the Effective  Time;  provided that
the foregoing  shall not apply to the extent it would result in  duplication  of
benefits.  Nothing in this  paragraph  shall be interpreted to require Nortel to
provide for the participation of any Company Employee in any Nortel Plan.

     (c) To the extent  applicable,  Nortel and the Company shall each take such
reasonable  steps as are required to cause the  disposition  and  acquisition of
equity securities (including  derivative  securities) pursuant to Article III of
this  Agreement  in  connection  with the  consummation  of the  Merger  by each
individual who is an officer or director of the Company to qualify for exemption
from Section  16(b) of the Exchange  Act pursuant to Rule  16b-3(e)  promulgated
under the Exchange Act.

     6.14.  Accountants'  Letters.  Each of the Company and Nortel shall use its
reasonable  best efforts to cause to be delivered to the other party a letter of
Deloitte & Touche LLP ("Deloitte"),  respectively, independent auditors, dated a
date within two Business  Days of the date on which the  Registration  Statement
shall  become  effective  and  addressed  to such other  party,  and in form and
substance  customary for "comfort" letters delivered by independent  accountants
(x) in the case of  Deloitte  in its  capacity  as  independent  auditors to the
Company, in accordance with Statement of Accounting  Standards No. 72 and (y) in
the case of  Deloitte  in its  capacity as  independent  auditors to Nortel,  in
accordance with the Handbook of The Canadian Institute of Chartered Accountants.

     6.15.  Notification of Certain Matters.  (a) Each of the Company and Nortel
shall give prompt notice to the other of any fact,  event or circumstance  known
to it  that  would  cause  or  constitute  a  material  breach  of  any  of  its
representations, warranties, covenants or agreements contained herein.

     (b)  Nortel  shall  promptly  notify the  Company,  and the  Company  shall
promptly notify Nortel, in writing,  of any notice or other  communication  from
any regulatory authority or self-regulatory  organization in connection with the
transactions contemplated by this Agreement or the Option Agreement.

     (c) Each of Nortel and the Company shall  promptly  notify the other of any
fact,  event or circumstance  known to it that could  reasonably be expected to,
individually  or taken together with all other facts,  events and  circumstances
known to it,  cause the Merger to fail to qualify as a  "reorganization"  within
the meaning of Section 368(a) of the Code.

     6.16.  Certain Tax  Matters.  Each of Nortel and the  Company  will use its
reasonable  best  efforts to cause the  Merger to  constitute  a  reorganization
within the  meaning of Section  368(a) of the Code,  and to timely  satisfy,  or
cause  to  be  timely  satisfied,   all  applicable  tax  reporting  and  filing
requirements contained in the U.S. Code and Treasury Regulations with respect to
the Merger,  including the  reporting  requirements  contained in U.S.  Treasury
Regulation Section 1.367(a)-3(c)(6).

     6.17.  Agreements  with Respect to  Assumption  of Company  Stock  Options.
Nortel will use its reasonable best efforts to obtain any requisite  approval of
the Canadian Stock Exchanges of Nortel's assumption of the Company Stock Options
and the  exercisability  thereof by the holders thereof to acquire Nortel Common
Shares. If the Canadian Stock Exchanges require,  as a condition to granting any
such approval,  that the holders of Nortel Common Shares approve such assumption
and  exercisability,  Nortel will,  subject to the second  succeeding  sentence,
take, in accordance with this Agreement, applicable law, applicable rules of the
Canadian  Stock  Exchanges and its articles of  incorporation  and by-laws,  all
action  necessary  to convene an  appropriate  meeting  of its  shareholders  to
consider and vote upon the approval of such assumption and exercisability,  such
meeting to be held no later than five business  days after the Company  Meeting.
Nortel shall at all times  recommend such approval and shall take all reasonable
lawful action to solicit such approval by its  shareholders.  In lieu of seeking
such approval,  Nortel may elect to permit the following  (and, if such approval
of Nortel's  shareholders  is not  obtained,  the following  shall  apply):  the
Company shall be permitted to take all necessary or appropriate actions to cause
the acceleration of the vesting of the Company Stock Options so that they may be
exercised by the holders  thereof  beginning  three  business  days prior to the
Effective Time and the Company shall take all necessary or  appropriate  actions
so that any Company Stock Options  remaining  unexercised  at the Effective Time
shall,  without the necessity of any further action by the holders  thereof,  be
canceled and converted into the right of the holder thereof to receive,  in lieu
of shares  of  Company  Common  Stock  and  subject  to  applicable  income  tax
withholding and employer  taxes,  for each share of Company Common Stock covered
thereby,  an amount in cash equal to the difference  obtained by subtracting the
exercise price per share of such Company Stock Option from $29.23.  In the event
that Nortel makes the described  election,  or such Nortel shareholder  approval
has not been  obtained,  from and after the  Effective  Time,  all Company Stock
Options shall represent only the right of the holders thereof to receive payment
of the amount  described  above upon  surrender  thereof and all  Company  Stock
Option  Plans shall  terminate  as of the  Effective  Time.  In such event,  the
Company shall take all permitted actions necessary to ensure that, following the
Effective  Time, no  participant in any Company Stock Option Plan shall have any
right  thereunder to acquire equity  securities or other ownership  interests of
Nortel, the Company, the Surviving  Corporation or any Subsidiary thereof and to
terminate all Company Stock Option Plans.


                                   ARTICLE VII

                    CONDITIONS TO CONSUMMATION OF THE MERGER

     7.01.  Conditions  to Each  Party's  Obligation  to Effect the Merger.  The
respective  obligation of each of Nortel,  Sub and the Company to consummate the
Merger is subject to the  fulfillment or written  waiver by Nortel,  Sub and the
Company prior to the Effective Time of each of the following conditions:

     (a) Stockholder Approvals. This "agreement of merger" (as that term is used
in Section 251 of the DGCL) and the Merger  shall have been duly  adopted by the
requisite vote of the stockholders of the Company.

     (b) Regulatory  Approvals.  All regulatory approvals required to consummate
the transactions  contemplated  hereby shall have been obtained and shall remain
in full force and effect and all statutory  waiting  periods in respect  thereof
shall have expired and (in the case of Nortel's  obligation  to  consummate  the
Merger)  no  such  approvals  shall  contain  any  conditions,  restrictions  or
requirements  which would  reasonably be expected to (i) following the Effective
Time, have a Material Adverse Effect on Nortel and its  Subsidiaries  taken as a
whole or on the Surviving  Corporation or (ii) require Nortel to take any action
that it is not required to take under Section 6.11(d) hereof.

     (c) No  Injunction.  No  Governmental  Authority of competent  jurisdiction
shall have enacted, issued, promulgated,  enforced or entered any statute, rule,
regulation,  judgment,  decree,  injunction or other order  (whether  temporary,
preliminary  or  permanent)   which  is  in  effect  and  enjoins  or  prohibits
consummation of the Merger.

     (d) Registration  Statement.  The Registration  Statement shall have become
effective   under  the  Securities   Act  and  no  stop  order   suspending  the
effectiveness  of the  Registration  Statement  shall have been issued and be in
effect  and no  proceedings  for that  purpose  shall  have  been  initiated  or
threatened by the SEC and not concluded or withdrawn.

     (e) Listing.  The Nortel  Common Shares to be issued in the Merger and upon
exercise  of  Company  Stock  Options  to be  assumed by Nortel by reason of the
Merger shall have received  conditional approval for listing on the NYSE and the
Canadian Stock Exchanges, subject to official notice of issuance.

     7.02.  Conditions  to  Obligation  of the Company.  The  obligation  of the
Company to consummate  the Merger is also subject to the  fulfillment or written
waiver  by the  Company  prior to the  Effective  Time of each of the  following
conditions:

     (a) Representations  and Warranties.  All representations and warranties of
Nortel  set forth in this  Agreement  (without  giving  effect to any  standard,
qualification  or exception  contained  therein with respect to  materiality  or
Material  Adverse  Effect)  shall  be true and  correct,  as of the date of this
Agreement and as of the Effective Date as though made on and as of the Effective
Date (except that representations and warranties that by their terms speak as of
the date of this  Agreement  or some other date shall be true and  correct as of
such  date),  except  as  would  not have or  reasonably  be  expected  to have,
individually or in the aggregate,  a Material Adverse Effect on Nortel;  and the
Company shall have received a certificate,  dated the Effective Date,  signed on
behalf of Nortel by the Chief Executive  Officer or the Chief Financial  Officer
of Nortel to such effect.

     (b) Performance of Obligations. Nortel shall have performed in all material
respects all obligations  required to be performed by it under this Agreement at
or  prior  to the  Effective  Time,  and  the  Company  shall  have  received  a
certificate,  dated the Effective Date,  signed on behalf of Nortel by the Chief
Executive Officer or the Chief Financial Officer of Nortel to such effect.

     (c) Opinion of the  Company's  Counsel.  The Company shall have received an
opinion of Fried,  Frank,  Harris,  Shriver & Jacobson,  counsel to the Company,
dated  the  Effective  Date,  to  the  effect  that,  on  the  basis  of  facts,
representations  and  assumptions  set  forth in such  opinion,  (a) the  Merger
constitutes a reorganization  within the meaning of Section 368 (a) of the Code,
(b) Nortel shall be treated as a corporation under Section 367(a)(1) of the Code
with respect to each transfer of property  thereto  pursuant to the Merger,  and
(c) that, accordingly,  (i) no gain or loss will be recognized by the Company as
a  result  of the  Merger  and  (ii) no gain or  loss  will be  recognized  by a
stockholder  of the Company who receives  Nortel  Common  Shares in exchange for
shares of Company Common Stock,  except with respect to cash received in lieu of
fractional share interests.  In rendering its opinion,  such counsel may require
and rely upon representations contained in letters from the Company, Nortel, Sub
and  stockholders  of the Company.  Counsel's  opinion shall not address the tax
consequences applicable to any stockholder of the Company who, immediately after
the Merger,  will be a "five  percent  transferee  shareholder"  with respect to
Nortel within the meaning of U.S. Treasury Regulation Section 1.367(a)-3(c)(5).

     (d) No Material Adverse Effect.  From the date of this Agreement,  no event
shall have occurred or circumstance arisen or been discovered that, individually
or taken together with all other such events and circumstances, has had or would
reasonably be expected to have a Material Adverse Effect on Nortel.

     7.03. Conditions to Obligation of Nortel and Sub. The obligations of Nortel
and Sub to consummate the Merger are also subject to the  fulfillment or written
waiver by Nortel and Sub prior to the  Effective  Time of each of the  following
conditions:

     (a) Representations  and Warranties.  All representations and warranties of
the Company set forth in this Agreement  (without giving effect to any standard,
qualification  or exception  contained  therein with respect to  materiality  or
Material  Adverse  Effect)  shall  be true and  correct,  as of the date of this
Agreement and as of the Effective Date as though made on and as of the Effective
Date (except that representations and warranties that by their terms speak as of
the date of this  Agreement  or some other date shall be true and  correct as of
such  date),  except  as  would  not have or  reasonably  be  expected  to have,
individually or in the aggregate,  a Material Adverse Effect on the Company; and
Nortel and Sub shall have  received a  certificate,  dated the  Effective  Date,
signed on behalf of the  Company by the Chief  Executive  Officer  and the Chief
Financial Officer of the Company to such effect.

     (b)  Performance  of  Obligations  of the Company.  The Company  shall have
performed in all material  respects all obligations  required to be performed by
it under this  Agreement at or prior to the Effective  Time,  and Nortel and Sub
shall have received a certificate, dated the Effective Date, signed on behalf of
the Company by the Chief Executive  Officer and the Chief  Financial  Officer of
the Company to such effect.

     (c) Material  Adverse  Effect.  From the date of this  Agreement,  no event
shall have occurred or circumstance arisen or been discovered that, individually
or taken together with all other such events and  circumstances has had or would
reasonably be expected to have a Material Adverse Effect on the Company.

     (d)  Opinion of Nortel and Sub's  Counsel.  Nortel  shall have  received an
opinion of Cleary, Gottlieb, Steen & Hamilton, special counsel to Nortel and Sub
dated  the  Effective  Date,  to  the  effect  that,  on  the  basis  of  facts,
representations  and  assumptions  set  forth in such  opinion,  (a) the  Merger
constitutes a reorganization  under Section 368(a) of the Code, (b) Nortel shall
be treated as a corporation  under Section 367(a)(1) of the Code with respect to
each  transfer  of  property  thereto  pursuant  to the  Merger  and  (c)  that,
accordingly,  (i) no gain or loss will be  recognized by the Company as a result
of the Merger and (ii) no gain or loss will be recognized  by a  stockholder  of
the Company who  receives  Nortel  Common  Shares in exchange  for shares of the
Company Common Stock, except with respect to cash received in lieu of fractional
share  interests.  In rendering  its opinion,  such counsel may require and rely
upon  representations  contained in letters from the  Company,  Nortel,  Sub and
stockholders  of the  Company.  Counsel's  opinion  shall  not  address  the tax
consequences applicable to any stockholder of the Company who, immediately after
the Merger,  will be a "five  percent  transferee  shareholder"  with respect to
Nortel within the meaning of U.S. Treasury Regulation Section 1.367(a)-3(c)(5).

     (e) No Action Seeking  Injunction.  No Governmental  Authority of competent
jurisdiction  shall have  brought an action or  proceeding  seeking to enjoin or
prohibit  consummation,  or require the unwinding,  of the Merger,  or to impose
substantial  penalties as a result of the Merger,  which action or proceeding is
reasonably likely to succeed.

                                  ARTICLE VIII

                                   TERMINATION

                  8.01. Termination.  This Agreement may be terminated,  and the
Merger may be abandoned:

     (a) Mutual Consent.  At any time prior to the Effective Time, by the mutual
consent of Nortel and the Company by action taken by their respective  Boards of
Directors.

     (b)  Breach.  At any time  prior to the  Effective  Time,  by Nortel or the
Company,  in the  event  of  either:  (i) a  breach  by the  other  party of any
representation   or  warranty   contained  herein  which  would  result  in  the
non-satisfaction of the conditions set forth in Sections 7.02(a) and 7.03(a), as
the case may be,  which  breach is not  capable  of being  cured or has not been
cured  within 10  calendar  days  after  the  giving  of  written  notice to the
breaching party of such breach;  or (ii) a material breach by the other party of
any of the covenants or agreements contained herein, which breach is not capable
of being cured or has not been cured within 10 calendar days after the giving of
written  notice to the  breaching  party of such  breach.  Without  limiting the
foregoing,  for all  purposes of this  Agreement,  any breach of the  agreements
contained  in  Section  6.06 or in the first  sentence  of  Section  6.02  shall
constitute a breach which is not capable of being cured.

     (c)  Delay.  At any time  prior to the  Effective  Time,  by  Nortel or the
Company,  if its Board of Directors so determines,  in the event that the Merger
is not  consummated  by March 31, 2000, or, in the event that an approval of any
Governmental  Authority  required to be  obtained  for the  consummation  of the
transactions  contemplated  by this  Agreement has not been  obtained,  June 30,
2000, except to the extent that the failure of the Merger then to be consummated
arises  out of or  results  from the  knowing  action or  inaction  of the party
seeking to terminate  pursuant to this Section  8.01(c) which action or inaction
is in violation of its obligations under this Agreement.

     (d) No Approval.

     (i) By the Company or Nortel, by action taken by its Board of Directors, in
the event the approval of any Governmental  Authority  required for consummation
of the Merger and the other  transactions  contemplated  by this Agreement shall
have been denied by final nonappealable action of such Governmental Authority.

     (ii) By Nortel, by action taken by its Board of Directors, in the event any
required approval of a Governmental Authority contains any final,  nonappealable
conditions,  restrictions or requirements  which would reasonably be expected to
(A) following the Effective Time,  have a Material  Adverse Effect on Nortel and
its Subsidiaries taken as a whole or on the Surviving Corporation or (B) require
Nortel to take any action that it is not required to take under Section  6.11(d)
hereof.

     (iii) By the  Company,  by action taken by its Board of  Directors,  in the
event any  required  approval of a  Governmental  Authority  contains any final,
nonappealable conditions, restrictions or requirements which would reasonably be
expected to (A) following the Effective Time, have a Material  Adverse Effect on
Nortel and its  Subsidiaries  taken as a whole or (B) require Nortel to take any
action that it is not required to take under Section 6.11(d) hereof,  unless (in
either case) within 30 days following receipt by Nortel of written notice of the
Company's  intent to  terminate  this  Agreement  under this clause (iii) Nortel
notifies the Company that it waives its right to terminate this Agreement  under
clause (ii) above.

     (iv) By Nortel or the Company, if its Board of Directors so determines,  in
the event the approval of the Company's stockholders required by Section 7.01(a)
herein is not obtained at the Company Meeting by reason of the failure to obtain
the  requisite  vote  required by Section  7.01(a) at a duly held  meeting or an
adjournment thereof.

     (e) Board Action.

     (i) By  Nortel  if the  Board of  Directors  of the  Company,  prior to the
Company  Meeting  (A)  shall  withdraw  or  modify  in any  adverse  manner  its
recommendation of the "agreement of merger" (as such term is used in Section 251
of the DGCL)  contained in this  Agreement  (whether or not such  withdrawal  or
modification is permitted by Section 6.06(c)), or (B) shall resolve to do so.

     (ii) By the Company if the Board of Directors of the Company,  prior to the
Company Meeting shall elect to terminate this  Agreement,  in order to recommend
or approve a Superior  Proposal;  provided  that (x) the  Company  has  notified
Nortel in writing that it intends to  recommend or approve a Superior  Proposal,
attaching the most current  version of such proposal to such notice,  and (y) at
any time after the third  Business Day  following  written  notification  by the
Company to Nortel of the Company's  intention to enter into a binding  agreement
with respect to such proposal,  after taking into account any  modifications  to
the transactions  contemplated by the Agreement that Nortel has then proposed in
writing and not withdrawn,  the Company Board has determined  that such proposal
is and continues to be a Superior Proposal, and (z) concurrently with the giving
of notice of such  termination,  pays to Nortel  the  Termination  Fee due under
Section  8.02(b)  (unless  Nortel has  previously  notified  the  Company of its
election to defer such payment pursuant to Section 8.02(c)).

     8.02.  Effect  of  Termination  and  Abandonment.   (a)  In  the  event  of
termination of this Agreement and the abandonment of the Merger pursuant to this
Article  VIII,  no party to this  Agreement  shall have any liability or further
obligation to any other party hereunder  except as set forth in subsections (b),
(c) and (d) below and in Section 9.01.

     (b) Nortel and the Company  agree that the Company  shall pay to Nortel the
sums described below (the "Termination Fee") solely as follows:

     (i) the sum of $15,000,000  either if (x) the Company shall  terminate this
Agreement  pursuant to Section  8.01(c)  (unless the failure to  consummate  the
Merger by the  relevant  date results  primarily  from the action or inaction of
Nortel or from Nortel's or Sub's  inability to obtain consent or approval of, or
make any filing or registration  with, any Governmental  Authority),  (y) at any
time  after the date of this  Agreement  and at or before  the time of the event
giving rise to such  termination  there shall exist an Acquisition  Proposal and
(z) within 12 months of the  termination of this  Agreement,  the Company enters
into a definitive  agreement with any third party with respect to an Acquisition
Proposal or an  Acquisition  Proposal is  consummated,  or if (A) the Company or
Nortel shall terminate this Agreement pursuant to Section 8.01(d)(iv) due to the
failure of the Company's  stockholders to approve and adopt this Agreement,  (B)
at any time  after the date of this  Agreement  and at or before the time of the
event giving rise to such termination there shall exist an Acquisition  Proposal
which  has been  publicly  announced  or the  existence  of which is a matter of
public  knowledge and (C) within 12 months of the termination of this Agreement,
the Company enters into a definitive agreement with any third party with respect
to an Acquisition Proposal or an Acquisition Proposal is consummated;

     (ii)  the sum of  $4,000,000  if  Nortel  shall  terminate  this  Agreement
pursuant to Section 8.01(b)(i) or Section 8.01(b)(ii) following a willful breach
of any of the representations,  covenants or agreements contained herein, and an
additional  sum of  $11,000,000  if (x) at any  time  after  the  date  of  this
Agreement and at or before the time of the event giving rise to such termination
there  shall  exist an  Acquisition  Proposal  and (y)  within  12 months of the
termination of this  Agreement,  the Company enters into a definitive  agreement
with any third party with respect to an  Acquisition  Proposal or an Acquisition
Proposal is consummated;

     (iii) the sum of  $15,000,000  if Nortel  shall  terminate  this  Agreement
pursuant to Section 8.01(e)(i); or

     (iv) the sum of $15,000,000  if the Company shall  terminate this Agreement
pursuant to Section 8.01(e)(ii).

     (c) Any Termination  Fee required to be paid pursuant to subsection  (b)(i)
above shall be payable by the Company to Nortel not later than two Business Days
after the date the Company  enters into a definitive  agreement with respect to,
or the date of consummation of, an Acquisition  Proposal,  whichever is earlier.
The  sum  of  $4,000,000  required  to be  paid  upon  termination  pursuant  to
subsection  (b)(ii)  above  shall be payable by the  Company to Nortel not later
than two  Business  Days after the  termination  referred  to  therein,  and any
additional  sum of  $11,000,000  required  to be  paid  thereafter  pursuant  to
subsection  (b)(ii)  above  shall be payable by the  Company to Nortel not later
than two  Business  Days after the date the  Company  enters  into a  definitive
agreement  with  respect  to, or the date of  consummation  of,  an  Acquisition
Proposal, whichever is earlier. Any Termination Fee required to be paid pursuant
to subsection (b)(iii) above shall be payable by the Company to Nortel not later
than  two  Business  Days  after  the  termination   referred  to  therein.  Any
Termination  Fee required to be paid  pursuant to  subsection  (b)(iv)  shall be
payable  as set forth in clause (z) of Section  8.01(e)(ii).  In no event  shall
more  than   $15,000,000  be  payable  in  respect  of  the   Termination   Fee.
Notwithstanding  the foregoing,  (i) Nortel may elect, by notice to the Company,
to defer the  payment of the  Termination  Fee from time to time for a period or
periods of up to an  aggregate  of twelve  months  after the date such fee would
otherwise be payable and (ii) the Termination Fee (including any portion thereof
pursuant to Section 8.02(b)(ii)) shall cease to be payable immediately following
any  exercise by Nortel of the Option under the Option  Agreement.  All payments
under this Section 8.02 shall be made by wire transfer of immediately  available
funds to an account designated by the party entitled to receive payment.

     (d) If the  Company  shall  terminate  this  Agreement  pursuant to Section
8.01(b)(i)  or  Section  8.01(b)(ii)  following  a willful  breach of any of the
representations,  covenants or agreements contained herein,  Nortel shall pay to
the Company the sum of $4,000,000 (the "Company  Termination  Fee"). The Company
Termination  Fee shall be  payable by Nortel to the  Company  not later than two
Business  Days  after  the  termination  by  the  Company  pursuant  to  Section
8.01(b)(i) or Section 8.01(b)(ii); provided that in no event shall more than one
Company  Termination  Fee be payable.  All payments  under this Section  8.02(d)
shall be made by wire  transfer  of  immediately  available  funds to an account
designated by the Company.

                                   ARTICLE IX

                                  MISCELLANEOUS

     9.01. Survival. All representations,  warranties,  agreements and covenants
contained in this Agreement  shall not survive the Effective Time or termination
of this Agreement if this Agreement is terminated  prior to the Effective  Time;
provided,  however,  if the Effective Time occurs, the agreements of the parties
in Sections  6.01,  6.03,  6.10,  6.12,  6.13 and 6.16 and this Article IX shall
survive the Effective  Time,  and if this  Agreement is terminated  prior to the
Effective Time, the agreements of the parties in the proviso to Section 6.05(a),
Sections  6.05(b) and 8.02 and Article IX and in the  Confidentiality  Agreement
shall survive such  termination  and the Option  Agreement  shall survive to the
extent provided therein.

     9.02.  Amendment;   Extension;  Waiver.  (a)  Subject  to  compliance  with
applicable law, this Agreement may be amended by the parties  hereto,  by action
taken or authorized by their respective Boards of Directors,  at any time before
or after approval of the matters  presented in connection with the Merger by the
stockholders of the Company;  provided,  however, that after any approval of the
transactions  contemplated by this Agreement by the stockholders of the Company,
there may not be, without further approval of such  stockholders,  any amendment
of this Agreement which by law requires  further  approval by such  stockholders
without such further  approval.  This  Agreement may not be amended except by an
instrument in writing signed on behalf of each of the parties hereto.

     (b) Prior to the Effective  Time,  the parties  hereto,  by action taken or
authorized by their respective  Boards of Directors,  may, to the extent legally
allowed,  (i) extend the time for the  performance of any of the  obligations or
other  acts of the other  parties  hereto,  (ii) waive any  inaccuracies  in the
representations  and warranties  contained  herein or in any document  delivered
pursuant  hereto  and  (iii)  waive  compliance  with any of the  agreements  or
conditions  contained herein. Any agreement on the part of a party hereto to any
such  extension  or  waiver  shall  be  valid  only if set  forth  in a  written
instrument  signed on  behalf of such  party,  but such  extension  or waiver or
failure to insist on strict compliance with an obligation,  covenant,  agreement
or condition  shall not operate as a waiver of, or estoppel with respect to, any
subsequent or other failure.

     9.03.  Counterparts.  This  Agreement  may  be  executed  in  one  or  more
counterparts, each of which shall be deemed to constitute an original.

     9.04.  Governing Law. This Agreement  shall be governed by, and interpreted
in  accordance  with,  the  laws of the  State of New York  (except  insofar  as
mandatory  provisions  of Delaware law are  applicable),  without  regard to the
conflict of law principles thereof.

     9.05. Expenses. Subject to Section 8.02(b), each party hereto will bear all
expenses  incurred by it in connection with this Agreement and the  transactions
contemplated  hereby,   except  that  printing  and  mailing  expenses  and  SEC
registration  and filing  fees shall be shared  equally  between the Company and
Nortel.

     9.06. Notices. All notices,  requests and other communications hereunder to
a party shall be in writing and shall be deemed given if  personally  delivered,
telecopied  (with  confirmation)  or three  Business  Days after being mailed by
registered  or certified  mail (return  receipt  requested)  or one Business Day
after  being  delivered  by  overnight  courier to such party at its address set
forth  below or such other  address  as such party may  specify by notice to the
parties hereto.

                  If to Nortel or to Sub, to:

                  Nortel Networks Corporation
                  8200 Dixie Road, Suite 100
                  Brampton, Ontario
                  Canada L6T 5P6
                  Attention: Corporate Secretary
                  Fax: (905) 863-8386
                  Phone: (905) 863-0000


                  With a copy to:

                  Cleary, Gottlieb, Steen & Hamilton
                  One Liberty Plaza
                  New York, New York 10006
                  Attention: Victor I. Lewkow, Esq.
                  Fax: (212) 225-3999
                  Phone: (212) 225-2000

                  If to the Company, to:

                  Periphonics Corporation
                  4000 Veterans Memorial Highway
                  Bohemia, NY 11716
                  Attention:  Peter J. Cohen
                  Fax:  (516) 467-1755
                  Phone: (516) 468-9000

                  With a copy to:

                  Fried, Frank, Harris, Shriver & Jacobson
                  1001 Pennsylvania Avenue
                  Suite 800
                  Washington, DC 20004
                  Attention: Stephen I. Glover, Esq.
                  Fax: (202) 639-7008
                  Phone: (202) 639-7000

                  and another copy to:

                  Ruskin, Moscou, Evans & Faltischek, P.C.
                  170 Old Country Road
                  Mineola, New York  11501
                  Attention:  Norman Friedland, Esq.
                  Fax: (516) 663-6601
                  Phone: (516) 663-6600


     9.07.  Entire  Understanding.  This  Agreement  (including  the  Disclosure
Schedules), the Option Agreement and the Confidentiality Agreement represent the
entire  understanding  of the parties hereto with reference to the  transactions
contemplated hereby and thereby and this Agreement  supersedes any and all other
oral  or  written   agreements   (other  than  the  Option   Agreement  and  the
Confidentiality Agreement) heretofore made.

     9.08. Assignment; No Third Party Beneficiaries. Neither this Agreement, nor
any of the  rights,  interests  or  obligations  shall be assigned by any of the
parties  hereto  (whether by  operation of law or  otherwise)  without the prior
written consent of the other parties.  Subject to the preceding  sentence,  this
Agreement  will be binding upon,  inure to the benefit of and be  enforceable by
the parties and their  respective  successors  and  assigns.  Except for Section
6.12, nothing in this Agreement expressed or implied, is intended to confer upon
any person,  other than the parties hereto or their respective  successors,  any
rights,  remedies,  obligations  or  liabilities  under  or by  reason  of  this
Agreement.

     9.09.  Interpretation.  When a  reference  is  made in  this  Agreement  to
Sections, Exhibits or Disclosure Schedules, such reference shall be to a Section
of, or Exhibit or  Disclosure  Schedule  to,  this  Agreement  unless  otherwise
indicated.  The table of contents and headings  contained in this  Agreement are
for  reference  purposes only and are not part of this  Agreement.  Whenever the
words  "include",  "includes" or "including"  are used in this  Agreement,  they
shall be deemed to be followed by the words "without limitation".  Any reference
to "herein" or "hereof" or similar terms shall refer to the agreement as a whole
rather than to the individual paragraph, section or article.

     9.10.  Severability.  Any  term or  provision  of this  Agreement  which is
invalid or unenforceable in any jurisdiction shall, as to that jurisdiction,  be
ineffective  to the  extent  of  such  invalidity  or  unenforceability  without
rendering  invalid or  unenforceable  the remaining terms and provisions of this
Agreement or affecting  the  validity or  enforceability  of any of the terms or
provisions of this Agreement in any other jurisdiction. If any provision of this
Agreement is so broad as to be unenforceable, the provision shall be interpreted
to be only so broad as it is enforceable.

     9.11.  Pre-Termination Equitable Remedies. Prior to any termination of this
Agreement,  each party hereto  shall retain all rights to equitable  remedies to
which it is entitled under applicable law.



<PAGE>





     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
executed in counterparts by their duly  authorized  officers,  all as of the day
and year first above written.

                                                    NORTEL NETWORKS CORPORATION


                                                 By: /s/
                                                     --------------------------
                                                     Name:
                                                     Title:

                                                 By: /s/
                                                     --------------------------
                                                     Name:
                                                     Title:


                                                     NORTH SUBSIDIARY, INC.


                                                 By: /s/
                                                     --------------------------
                                                     Name:
                                                     Title: President



                                                     PERIPHONICS CORPORATION


                                                 By: /s/
                                                     --------------------------
                                                     Name:
                                                     Title:

<PAGE>



                                                                      Exhibit A


                            Form of Affiliate Letter


Nortel Networks Corporation
8200 Dixie Road, Suite 100
Brampton, Ontario, Canada
L6T 5P6

Ladies and Gentlemen:

     I have been  advised  that as of the date of this letter I may be deemed to
be an  "affiliate"  of  Periphonics  Corporation,  a Delaware  corporation  (the
"Company"),  as the term  "affiliate"  is defined for purposes of paragraphs (c)
and (d) of Rule 145 of the rules and regulations  (the "Rules and  Regulations")
of  the  Securities  and  Exchange   Commission  (the  "Commission")  under  the
Securities  Act of 1933,  as amended (the  "Act").  Pursuant to the terms of the
Agreement and Plan of Merger dated as of August 23, 1999 (the  "Agreement"),  by
and between Nortel  Networks  Corporation,  a Canadian  corporation  ("Nortel"),
North  Subsidiary,  Inc., a Delaware  corporation and wholly owned subsidiary of
Nortel  ("Sub") and the Company,  Sub will merge into the Company or the Company
will merge with and into Sub (the "Merger").

     As a result of the Merger, I may receive common shares,  without par value,
of Nortel (the  "Nortel  Common  Shares") in exchange  for shares owned by me of
common stock, par value $0.01 per share, of the Company.

     I represent, warrant and covenant to Nortel that in the event I receive any
Nortel Common Shares as a result of the Merger:

     A. I shall  not make any  sale,  transfer  or other  disposition  of Nortel
Common Shares in violation of the Act or the Rules and Regulations.

     B. I have  carefully  read this letter and the  Agreement and discussed the
requirements of such documents and other applicable  limitations upon my ability
to sell,  transfer or  otherwise  dispose of the Nortel  Common  Shares,  to the
extent I felt necessary, with my counsel or counsel for Nortel.

     C. I have been  advised  that the  issuance of Nortel  Common  Shares to me
pursuant to the Merger has been registered with the Commission  under the Act on
a Registration  Statement on Form S-4.  However,  I have also been advised that,
since at the time the Merger was submitted for a vote of the stockholders of the
Company,  I may be deemed  to have  been an  affiliate  of the  Company  and the
distribution by me of the Nortel Common Shares has not been registered under the
Act, I may not sell,  transfer or otherwise  dispose of the Nortel Common Shares
issued to me in the Merger unless (i) such sale,  transfer or other  disposition
has been registered under the Act, (ii) such sale, transfer or other disposition
is made in conformity with Rule 145 promulgated by the Commission  under the Act
or (iii) in the opinion of counsel reasonably  acceptable to Nortel, or pursuant
to a "no  action"  letter  obtained  by the  undersigned  from the  staff of the
Commission,  such sale,  transfer or other  disposition is otherwise exempt from
registration under the Act.

     D. I understand that, except as may be provided in any registration  rights
agreement  entered  into by  Nortel  and the  undersigned,  Nortel  is  under no
obligation  to register the sale,  transfer or other  disposition  of the Nortel
Common  Shares by me or on my behalf  under the Act or to take any other  action
necessary in order to make compliance  with an exemption from such  registration
available.

     Execution of this letter  should not be  considered an admission on my part
that I am an "affiliate"  of the Company as described in the first  paragraph of
this  letter or as a waiver of any rights I may have to object to any claim that
I am such an affiliate on or after the date of this letter.

                                                          Very truly yours,

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






Agreed to and Accepted this
____ day of _________, 1999

NORTEL NETWORKS CORPORATION

By: /s/
    -----------------------
    Name:
    Title:


By: /s/
    -----------------------
    Name:
    Title:





                             STOCK OPTION AGREEMENT

     STOCK  OPTION  AGREEMENT,  dated as of August 24,  1999 (the  "Agreement"),
between NORTEL NETWORKS  CORPORATION,  a Canadian corporation  ("Grantee"),  and
PERIPHONICS CORPORATION, a Delaware corporation ("Issuer").


                              W I T N E S S E T H:

     WHEREAS,  concurrently  herewith,  Grantee and Issuer are entering  into an
Agreement and Plan of Merger (the "Merger Agreement");

     WHEREAS, as a condition and inducement to Grantee's execution of the Merger
Agreement and in furtherance  of the  transactions  contemplated  thereby and in
consideration  therefor,  Issuer  has  agreed to grant  Grantee  the  Option (as
hereinafter defined); and

     WHEREAS,  the Board of  Directors  of Issuer has  approved the grant of the
Option and the Merger Agreement prior to the execution hereof;

     NOW, THEREFORE,  in consideration of the foregoing and the mutual covenants
and agreements set forth herein and in the Merger Agreement,  the parties hereto
agree as follows:

     1. The  Option.  (a) Issuer  hereby  grants to  Grantee  an  unconditional,
irrevocable  option (the "Option") to purchase,  subject to the terms hereof, up
to an aggregate of 2,634,131 fully paid and  nonassessable  shares of the common
stock,  $0.01 par value per  share,  of Issuer  ("Common  Stock") at a price per
share  equal to $29.23  (such  price,  as adjusted  if  applicable,  the "Option
Price");  provided,  however, that in the event Issuer issues or agrees to issue
any shares of Common Stock (other than as permitted under the Merger  Agreement)
at a price less than the Option Price (as  adjusted  pursuant to Section 5), the
Option Price shall be equal to such lesser price; provided,  further, that in no
event  shall the number of shares for which this  Option is  exercisable  exceed
19.9% of the  issued  and  outstanding  shares  of  Common  Stock at the time of
exercise  without giving effect to the shares of Common Stock issued or issuable
under the Option. The number of shares of Common Stock that may be received upon
the  exercise of the Option and the Option  Price are subject to  adjustment  as
herein set forth.

     (b) In the event that any  additional  shares of Common Stock are issued or
otherwise  become  outstanding  after  the date of this  Agreement  (other  than
pursuant to this  Agreement  and other than  pursuant to an event  described  in
Section 5(a) hereof), the number of shares of Common Stock subject to the Option
shall be increased so that,  after such issuance,  such number together with any
shares of Common Stock previously  issued pursuant  hereto,  equals 19.9% of the
number of shares of Common  Stock then  issued and  outstanding  without  giving
effect to any shares subject or issued pursuant to the Option. Nothing contained
in this Section 1(b) or elsewhere in this Agreement shall be deemed to authorize
Issuer to breach any provision of the Merger Agreement.

     2. Exercise; Closing. (a) Grantee and/or any other person that shall become
a holder  of all or part of the  Option  in  accordance  with the  terms of this
Agreement  (each such  person  being  referred  to herein as the  "Holder")  may
exercise  the  Option,  in whole  or part,  if,  but  only if,  both an  Initial
Triggering  Event (as  defined  below)  and a  Subsequent  Triggering  Event (as
defined  below)  shall have  occurred  prior to the  occurrence  of an  Exercise
Termination  Event (as defined below),  provided that the Holder shall have sent
written  notice of such exercise (as provided in subsection  (f) of this Section
2) within 180 days following  such  Subsequent  Triggering  Event (or such later
period as provided in Section 10).

     (b) Each of the following shall be an "Exercise Termination Event":

     (i) the Effective Time (as defined in the Merger Agreement);

     (ii)  termination of the Merger Agreement in accordance with the provisions
thereof  if such  termination  occurs  prior  to the  occurrence  of an  Initial
Triggering Event, except a termination by Grantee pursuant to Section 8.01(b) of
the Merger Agreement as a result of a breach of a covenant by Issuer or a breach
of a representation by Issuer;

     (iii) the passage of 12 months after  termination  of the Merger  Agreement
(or such later period as provided in Section 10) if such termination (A) follows
or is concurrent with the occurrence of an Initial  Triggering Event or (B) is a
termination by Grantee  pursuant to Section 8.01(b) of the Merger Agreement as a
result of a breach of a covenant  by Issuer or a breach of a  representation  by
Issuer; or

     (iv) the  receipt by Grantee  (pursuant  to its  request) of the sum of $15
million in respect of the Termination Fee.

     (c) The term  "Initial  Triggering  Event" shall mean any of the  following
events or transactions occurring after the date hereof:

     (i)  Issuer  or any  of its  Subsidiaries  (as  defined  in  Rule  1-02  of
Regulation  S-X  promulgated  by the  Securities  and Exchange  Commission  (the
"SEC")) (each an "Issuer  Subsidiary"),  without having received Grantee's prior
written  consent,  shall  have  entered  into  an  agreement  to  engage  in  an
Acquisition  Transaction  (as defined  below) with any person (the term "person"
for purposes of this Agreement  having the meaning  assigned thereto in Sections
3(a)(9)  and  13(d)(3)  of the  Exchange  Act) other than  Grantee or any of its
Subsidiaries  (each a "Grantee  Subsidiary") or the Board of Directors of Issuer
shall have  recommended  that the  stockholders  of Issuer approve or accept any
Acquisition  Transaction  (other  than  the  Merger  referred  to in the  Merger
Agreement). For purposes of this Agreement, "Acquisition Transaction" shall mean
(w) a merger or consolidation, or any similar transaction, involving Issuer, (x)
a purchase,  lease or other acquisition or assumption of all or more than 20% of
the consolidated  assets of Issuer  (including by way of merger,  consolidation,
share exchange or otherwise involving any Subsidiary of Issuer),  (y) a purchase
or other acquisition (including by way of merger, consolidation,  share exchange
or otherwise) of  beneficial  ownership  (the term  "beneficial  ownership"  for
purposes of this Agreement  having the meaning assigned thereto in Section 13(d)
of the Exchange  Act, and the rules and  regulations  thereunder)  of securities
representing 20% or more of the voting power of Issuer, or (z) any substantially
similar  transaction;  provided,  however,  that in no event  shall any  merger,
consolidation, purchase or similar transaction involving only the Issuer and one
or more of its  wholly-owned  Subsidiaries  or involving only any two or more of
such wholly-owned Subsidiaries,  be deemed to be an Acquisition Transaction,  if
such  transaction  is not entered  into in  violation of the terms of the Merger
Agreement;

     (ii) Issuer or any Issuer  Subsidiary,  without having  received  Grantee's
prior written consent, shall have authorized,  recommended, proposed or publicly
announced  its  intention to  authorize,  recommend or propose,  to engage in an
Acquisition  Transaction  with  any  person  other  than  Grantee  or a  Grantee
Subsidiary or shall have authorized or engaged in, or announced its intention to
authorize or engage in, any  negotiations  regarding an Acquisition  Transaction
with any person other than the Grantee or a Grantee Subsidiary,  or the Board of
Directors  of Issuer  shall have  failed to  recommend  or shall  have  publicly
withdrawn  or  modified,  or publicly  announced  its  intention  to withdraw or
modify,  in  any  manner  adverse  to  Grantee,   its  recommendation  that  the
stockholders of Issuer approve the Merger;

     (iii) The shareholders of Issuer shall have voted and failed to approve the
Merger at a meeting which has been held for that purpose or any  adjournment  or
postponement  thereof,  or such meeting shall not have been held in violation of
the Merger  Agreement or shall have been canceled  prior to  termination  of the
Merger  Agreement  if, prior to such meeting (or if such meeting  shall not have
been held or shall have been canceled,  prior to such  termination),  any person
(other than the Grantee or a Grantee  Subsidiary)  shall have made a proposal to
Issuer or its stockholders by public announcement or written  communication that
is or becomes  the  subject  of public  disclosure  to engage in an  Acquisition
Transaction;

     (iv) (a) Any person other than Grantee, any Grantee Subsidiary or any party
to the Stockholders  Agreement dated as of August 24, 1999, by and among Grantee
and the Stockholders  named therein (the  "Stockholders  Agreement")  shall have
acquired  beneficial  ownership or the right to acquire beneficial  ownership of
20% or more of the then outstanding shares of Common Stock or (b) any group (the
term  "group"  having the meaning  assigned in Section  13(d)(3) of the Exchange
Act),  other than a group of which the  Grantee or any Grantee  Subsidiary  is a
member,  shall have been formed that beneficially owns 20% or more of the shares
of Common Stock then outstanding;

     (v) Any person other than Grantee or any Grantee Subsidiary shall have made
a bona fide proposal to Issuer or its  stockholders  to engage in an Acquisition
Transaction and such proposal shall have become publicly known;

     (vi) Issuer shall have breached any covenant or obligation contained in the
Merger  Agreement in anticipation of engaging in an Acquisition  Transaction and
such breach (x) would entitle Grantee to terminate the Merger  Agreement and (y)
shall not have been cured prior to the Notice Date (as defined below); or

     (vii) Any person other than Grantee or any Grantee  Subsidiary,  other than
in connection  with a  transaction  to which Grantee has given its prior written
consent,  shall have filed with any federal or state  regulatory or governmental
authority  an  application  for  approval or notice of intention to engage in an
Acquisition Transaction.

     (d) The  term  "Subsequent  Triggering  Event"  shall  mean  either  of the
following events or transactions occurring after the date hereof:

     (i) The  acquisition  by any person or by a group other than Grantee or any
Grantee Subsidiary or persons party to the Stockholders Agreement (provided that
the Stockholders Agreement remains in full force and effect and such persons are
not claiming that such  Agreement is not in full force and effect) of beneficial
ownership of 25% or more of the then outstanding Common Stock; or

     (ii) The occurrence of the Initial  Triggering Event described in paragraph
(i) of  subsection  (c) of this Section 2, except that the  references to 20% in
clause (x) and clause (y) shall each be deemed to be a reference to 25%.

     (e) Issuer shall notify  Grantee  promptly in writing of the  occurrence of
any  Initial  Triggering  Event or  Subsequent  Triggering  Event  (together,  a
"Triggering  Event"),  it being  understood  that the  giving of such  notice by
Issuer  shall not be a  condition  to the right of the  Holder to  exercise  the
Option.

     (f) In the event the  Holder is  entitled  to and  wishes to  exercise  the
Option (or any portion  thereof),  it shall send to Issuer a written notice (the
date of which being herein referred to as the "Notice Date")  specifying (i) the
total  number of shares it will  purchase  pursuant to such  exercise and (ii) a
place and date not earlier than three  business  days nor later than 60 business
days from the Notice Date for the closing of such purchase (the "Closing Date");
provided,  that if the closing of such purchase  cannot be consummated by reason
of any applicable judgment,  injunction,  decree, order, law or regulation,  the
period of time that would  otherwise  run  pursuant to this  sentence  shall run
instead from the date on which such  restriction on consummation  has expired or
been  terminated;  and  provided,  further,  that if  prior  notification  to or
approval of any  regulatory or antitrust  agency is required in connection  with
such purchase, the Holder shall promptly file the required notice or application
for  approval  and shall  expeditiously  process the same and the period of time
that  otherwise  would run pursuant to this sentence  shall run instead from the
date on which any required  notification periods have expired or been terminated
or such approvals have been obtained and any requisite waiting period or periods
shall have  passed.  Any  exercise of the Option shall be deemed to occur on the
Notice Date relating thereto.

     (g) At the closing  referred to in  subsection  (f) of this  Section 2, the
Holder shall (i) pay to Issuer the  aggregate  purchase  price for the shares of
Common Stock  purchased  pursuant to the  exercise of the Option in  immediately
available  funds  by wire  transfer  to a bank  account  designated  by  Issuer,
provided  that  failure or refusal of Issuer to  designate  such a bank  account
shall not preclude the Holder from exercising the Option.

     (h) At such  closing,  simultaneously  with  the  delivery  of  immediately
available  funds as provided in  subsection  (g) of this Section 2, Issuer shall
deliver to the Holder a certificate or certificates  representing  the number of
shares of Common  Stock  purchased  by the Holder and,  if the Option  should be
exercised in part only, a new Option evidencing the rights of the Holder thereof
to purchase the balance of the shares purchasable hereunder.

     (i) Certificates  for Common Stock delivered at a closing  hereunder may be
endorsed with a restrictive legend that shall read substantially as follows:

     "The transfer of the shares  represented by this  certificate is subject to
certain  provisions  of an agreement  between the  registered  holder hereof and
Issuer and to resale  restrictions  arising  under  applicable  securities  laws
(including the Securities Act of 1933, as amended).  A copy of such agreement is
on file at the  principal  office of Issuer and will be  provided  to the holder
hereof without charge upon receipt by Issuer of a written request therefor."

     It is  understood  and  agreed  that:  (i)  the  reference  to  the  resale
restrictions arising under applicable  securities laws, including the Securities
Act of 1933,  as amended (the  "Securities  Act"),  in the above legend shall be
removed by delivery of substitute  certificate(s)  without such reference if the
Holder  shall have  delivered to Issuer a copy of a letter from the staff of the
SEC, or an opinion of counsel, in form and substance reasonably  satisfactory to
Issuer,  to the effect  that such  legend is not  required  for  purposes of the
Securities Act or other  applicable  securities  laws; (ii) the reference to the
provisions of this Agreement in the above legend shall be removed by delivery of
substitute certificate(s) without such reference if the shares have been sold or
transferred  in  compliance  with the  provisions  of this  Agreement  and under
circumstances that do not require the retention of such reference in the opinion
of counsel to the  Holder,  in form and  substance  reasonably  satisfactory  to
Issuer;  and (iii) the legend shall be removed in its entirety if the conditions
in the  preceding  clauses (i) and (ii) are both  satisfied.  In addition,  such
certificates shall bear any other legend as may be required by law.

     The Holder  understands  and agrees that the Option is being  issued to the
Holder pursuant to the registration and prospectus exceptions in paragraph 35(1)
and clause 72(1)(b) of the Securities Act (Ontario) (the "Ontario Act") and that
the resale of the Option or Common Stock  issued upon  exercise of the Option is
restricted by the  provisions of the Ontario Act and other  applicable  Canadian
securities legislation.

     (j) Upon the  giving  by the  Holder to  Issuer  of the  written  notice of
exercise of the Option  provided for under  subsection (f) of this Section 2 and
the tender of the applicable purchase price in immediately  available funds, the
Holder  shall be deemed to be the holder of record of the shares of Common Stock
issuable upon such  exercise,  notwithstanding  that the stock transfer books of
Issuer  shall then be closed or that  certificates  representing  such shares of
Common Stock shall not then be actually  delivered  to the Holder.  Issuer shall
pay all expenses,  and any and all United States federal,  state and local taxes
and other charges that may be payable in connection with the preparation,  issue
and  delivery  of stock  certificates  under  this  Section 2 in the name of the
Holder or its assignee, transferee or designee.

     3. Covenants of Issuer.  In addition to its other  agreements and covenants
herein, Issuer agrees:

     (a) that it shall at all  times  maintain,  free from any  subscriptive  or
preemptive  rights,  sufficient  authorized  but unissued or treasury  shares of
Common   Stock  so  that  the  Option  may  be  exercised   without   additional
authorization  of  Common  Stock  after  giving  effect  to all  other  options,
warrants,  convertible  securities and other rights of third parties to purchase
Common Stock from Issuer or to cause Issuer to issue shares of Common Stock;

     (b) that it will not,  by  charter  amendment  or  through  reorganization,
consolidation,  merger, dissolution or sale of assets, or by any other voluntary
act,  avoid  or  seek to  avoid  the  observance  or  performance  of any of the
covenants,  stipulations or conditions to be observed or performed  hereunder by
Issuer; and

     (c)  promptly  to take all action (i) as may from time to time be  required
(including  complying with all  applicable  notification,  filing  reporting and
waiting period  requirements under HSR or otherwise,  and cooperating fully with
the  Holder  in  preparing  any  applications  or  notices  and  providing  such
information  to any  regulatory  authority as it may require) in order to permit
the Holder to  exercise  the Option and  Issuer  duly and  effectively  to issue
shares of Common  Stock  pursuant  hereto,  and (ii) as may from time to time be
required to protect the rights of the Holder against dilution

     4. Exchange;  Replacement.  This Agreement (and the Option granted  hereby)
are  exchangeable,   without  expense,   at  the  option  of  the  Holder,  upon
presentation  and surrender of this Agreement at the principal office of Issuer,
for other Agreements providing for Options of different  denominations entitling
the  holder  thereof  to  purchase,  on the same  terms and  subject to the same
conditions as are set forth  herein,  in the aggregate the same number of shares
of Common Stock  purchasable  hereunder.  The terms  "Agreement" and "Option" as
used herein include any Agreements and related  Options for which this Agreement
(and the Option  granted  hereby) may be  exchanged.  Upon  receipt by Issuer of
evidence  reasonably  satisfactory  to it of the  loss,  theft,  destruction  or
mutilation of this Agreement, and (in the case of loss, theft or destruction) of
reasonably satisfactory indemnification,  and upon surrender and cancellation of
this Agreement, if mutilated, Issuer will execute and deliver a new Agreement of
like  tenor  and date.  Any such new  Agreement  executed  and  delivered  shall
constitute an additional  contractual  obligation on the part of Issuer, whether
or not the Agreement so lost,  stolen,  destroyed or mutilated shall at any time
be enforceable by any person other than the holder of the new Agreement.

     5.  Adjustments.  In addition to the  adjustment in the number of shares of
Common  Stock that are  purchasable  upon  exercise  of the Option  pursuant  to
Section 1 hereof,  the  number of shares of Common  Stock  purchasable  upon the
exercise of the Option and the Option Price shall be subject to adjustment  from
time to time as provided in this Section 5.

     (a) In the event of any change  in, or  distributions  in  respect  of, the
Common   Stock   by   reason   of   stock   dividends,    split-ups,    mergers,
recapitalizations,  combinations, subdivisions, conversions, exchanges of shares
or the like,  the type and  number of shares of Common  Stock  purchasable  upon
exercise hereof shall be  appropriately  adjusted and proper  provision shall be
made so that, in the event that any additional  shares of Common Stock are to be
issued or otherwise  become  outstanding  as a result of any such change  (other
than  pursuant  to an exercise  of the  Option),  the number of shares of Common
Stock that remain  subject to the Option shall be increased so that,  after such
issuance and together with shares of Common Stock previously  issued pursuant to
the  exercise  of the Option  (as  adjusted  on account of any of the  foregoing
changes in the Common Stock),  it equals 19.9% of the number of shares of Common
Stock then issued and outstanding.

     (b) Whenever the number of shares of Common Stock purchasable upon exercise
hereof is  adjusted as  provided  in this  Section 5, the Option  Price shall be
adjusted by multiplying  the Option Price by a fraction,  the numerator of which
shall be equal to the number of shares of Common Stock  purchasable prior to the
adjustment  and the  denominator of which shall be equal to the number of shares
of Common Stock purchasable after the adjustment.

     6. Registration. (a) Upon the occurrence of any Subsequent Triggering Event
that occurs prior to an Exercise  Termination  Event,  Issuer shall,  subject to
Section  6(d) hereof,  at the request of Grantee  delivered  within  twelve (12)
months  (or such  later  period  as  provided  in  Section  10  hereof)  of such
Subsequent  Triggering  Event  (whether  on its own  behalf  or on behalf of any
subsequent  holder of this  Option  (or part  thereof)  or any of the  shares of
Common Stock issued pursuant hereto),  promptly prepare, file and keep current a
shelf  registration  statement under the Securities Act covering this Option and
any  shares  issued  and  issuable  pursuant  to this  Option  and shall use its
reasonable best efforts to cause such registration statement to become effective
and  remain  current in order to permit  the sale or other  disposition  of this
Option and any shares of Common Stock  issued upon total or partial  exercise of
this  Option  ("Option  Shares")  in  accordance  with any  plan of  disposition
requested by Grantee.  Issuer will use its reasonable best efforts to cause such
registration statement promptly to become effective and then to remain effective
for a period not in excess of 180 days from the day such registration  statement
first becomes effective or such shorter time as may be reasonably necessary,  in
the  judgment  of the  Grantee  or the  Holder,  to effect  such  sales or other
dispositions. Grantee shall have the right to demand two such registrations. The
Issuer shall bear the costs of such  registrations  (including,  but not limited
to,  Issuer's  attorneys'  fees,  printing  costs and  filing  fees,  except for
underwriting   discounts  or  commissions,   brokers'  fees  and  the  fees  and
disbursements   of   Grantee's   counsel   related   thereto).   The   foregoing
notwithstanding,  if, at the time of any request by Grantee for  registration of
the Option or Option Shares as provided above,  Issuer is in  registration  with
respect to an underwritten  public offering by Issuer of shares of Common Stock,
and if in the good  faith  judgment  of the  managing  underwriter  or  managing
underwriters,  or,  if  none,  the sole  underwriter  or  underwriters,  of such
offering the inclusion of the Option or Option Shares would  interfere  with the
successful marketing of the shares of Common Stock offered by Issuer, the number
of  Option  Shares  otherwise  to  be  covered  in  the  registration  statement
contemplated  hereby may be reduced to the extent  necessary to  eliminate  such
condition;  provided,  however,  that  if such  reduction  occurs  (including  a
reduction to zero),  then Issuer  shall file a  registration  statement  for the
balance as promptly as practicable  thereafter as to which no reduction pursuant
to this Section 6 shall be permitted or occur and the Holder shall be deemed not
to have made an additional  registration demand and the twelve (12) month period
referred  to in the  first  sentence  of this  section  shall  be  increased  to
twenty-four  (24)  months.  Each  such  Holder  shall  provide  all  information
reasonably requested by Issuer for inclusion in any registration statement to be
filed  hereunder.  If  requested  by any such  Holder  in  connection  with such
registration, Issuer shall become a party to any underwriting agreement relating
to the sale of such  shares,  but only to the  extent  of  obligating  itself in
respect  of  representations,   warranties,  indemnities  and  other  agreements
customarily included in such underwriting  agreements for Issuer. Upon receiving
any request  under this Section 6 from any Holder,  Issuer agrees to send a copy
thereof  to any other  person  known to Issuer to be  entitled  to  registration
rights under this Section 6, in each case by promptly mailing the same,  postage
prepaid,  to the  address of record of the  persons  entitled  to  receive  such
copies.  Notwithstanding  anything to the contrary contained herein, in no event
shall  the  number  of  registrations  that  Issuer  is  obligated  to effect be
increased  by reason of the fact that  there  shall be more than one Holder as a
result of any assignment or division of this Agreement.

     (b) In the event that Grantee so requests, the closing of the sale or other
disposition of the Common Stock or other  securities  pursuant to a registration
statement  filed  pursuant  to Section  6(a) hereof  shall  occur  substantially
simultaneously with the exercise of the Option.

     (c) If the Common Stock or the class of any other securities to be acquired
upon exercise of the Option are then listed on the Nasdaq National Market of The
Nasdaq  Stock  Market,  Inc.  ("Nasdaq")  or any national  securities  exchange,
Issuer,  upon the request of the Holder,  shall  promptly file an application to
list the Common Stock or other  securities  to be acquired  upon exercise of the
Option on Nasdaq or such  exchange and will use its  reasonable  best efforts to
obtain approval of such listing as soon as practicable.

     (d)  Issuer  may  delay any  registration  of the  Option or Option  Shares
required  pursuant to Section  6(a) hereof for a period not in excess of 90 days
if, in the reasonable  good faith judgment of Issuer,  such  registration  would
materially  and adversely  affect a proposed  merger,  consolidation  or similar
transaction  (including through the premature disclosure thereof) or offering or
contemplated offering of other securities by Issuer.

     7.  Repurchase of Option and/or Option Shares.  (a) At any time  commencing
upon the  occurrence  of a Repurchase  Event (as defined in Section 7(d) hereof)
and ending  twelve  (12)  months  thereafter,  (i) at the request of the Holder,
delivered  in  writing  prior to an  Exercise  Termination  Event (or such later
period as provided  in Section  10),  Issuer (or any  successor  thereto)  shall
repurchase the Option from the Holder at a price (the "Option Repurchase Price")
equal to the  amount by which (A) the  market/offer  price  (as  defined  below)
exceeds (B) the Option Price,  multiplied by the number of shares for which this
Option  may then be  exercised,  and (ii) at the  request of the owner of Option
Shares  from  time to time  (the  "Owner"),  delivered  in  writing  prior to an
Exercise  Termination  Event (or such later  period as provided in Section  10),
Issuer (or any successor  thereto)  shall  repurchase  such number of the Option
Shares from the Owner as the Owner shall designate at a price (the "Option Share
Repurchase  Price") equal to the market/offer  price multiplied by the number of
Option  Shares so  designated.  The term  "market/offer  price"  shall  mean the
highest of (i) the price per share of Common Stock at which a tender or exchange
offer therefor has been made and has been  consummated  or remains  outstanding,
(ii) the price per share of Common Stock to be paid by any third party  pursuant
to an agreement with Issuer,  (iii) the highest average closing price for shares
of Common  Stock for any 20 trading  day period  within the  three-month  period
immediately  preceding  the  date  the  Holder  gives  notice  of  the  required
repurchase  of this Option or the Owner gives notice of the required  repurchase
of Option Shares, as the case may be, or (iv) in the event of a sale of all or a
majority of the consolidated  assets of Issuer, the sum of the net price paid in
such sale for such  assets and the current  market  value of the  remaining  net
assets of Issuer as determined  by a nationally  recognized  investment  banking
firm  selected  by the Holder or the Owner,  as the case may be, and  reasonably
acceptable  to  Issuer,  divided  by  the  number  of  shares  of  Common  Stock
outstanding  at the time of such  sale,  which  determination,  absent  manifest
error,  shall be conclusive for all purposes of this  Agreement.  In determining
the  market/offer  price,  the value of  consideration  other than cash shall be
determined by a nationally  recognized  investment  banking firm selected by the
Holder or Owner, as the case may be, and reasonably  acceptable to Issuer, which
determination,  absent manifest  error,  shall be conclusive for all purposes of
this Agreement.

     (b) The Holder and the Owner, as the case may be, may exercise its right to
require Issuer to repurchase  the Option and any Option Shares  pursuant to this
Section 7 by surrendering for such purpose to Issuer, at its principal office, a
copy of this  Agreement  or  certificates  for  Option  Shares,  as  applicable,
accompanied by a written notice or notices stating that the Holder or the Owner,
as the case may be, elects to require  Issuer to  repurchase  this Option and/or
the Option Shares in accordance  with the provisions of this Section 7. Prior to
the later of (x) the date that is five  business days after the surrender of the
Option and/or  certificates  representing  Option Shares and the receipt of such
notice or notices  relating  thereto and (y) the day on which a Repurchase Event
occurs,  Issuer shall  deliver or cause to be delivered to the Holder the Option
Repurchase  Price and/or to the Owner the Option Share  Repurchase  Price or the
portion  thereof that Issuer is not then  prohibited  under  applicable  law and
regulation from so delivering.

     (c) To the  extent  that  Issuer  is  prohibited  under  applicable  law or
regulation from repurchasing the Option and/or the Option Shares in full, Issuer
shall promptly so notify the Holder and/or the Owner and  thereafter  deliver or
cause to be delivered,  from time to time,  to the Holder  and/or the Owner,  as
appropriate,  the portion of the Option  Repurchase  Price and the Option  Share
Repurchase Price, respectively, that it is no longer prohibited from delivering,
within  five  business  days  after  the date on which  Issuer  is no  longer so
prohibited;  provided,  however,  that if Issuer at any time after delivery of a
notice of  repurchase  pursuant to paragraph (b) of this Section 7 is prohibited
under  applicable  law or  regulation  from  delivering to the Holder and/or the
Owner,  as  appropriate,  the  Option  Repurchase  Price  and the  Option  Share
Repurchase Price, respectively, in full (and Issuer hereby undertakes to use its
reasonable  best efforts to obtain all required  regulatory and legal  approvals
and to file  any  required  notices  as  promptly  as  practicable  in  order to
accomplish  such  repurchase),  the  Holder or Owner may  revoke  its  notice of
repurchase  of the Option  and/or the Option  Shares  whether in whole or to the
extent of the prohibition,  whereupon, in the latter case, Issuer shall promptly
(i) deliver to the Holder and/or the Owner, as appropriate,  that portion of the
Option  Repurchase Price and/or the Option Share Repurchase Price that Issuer is
not prohibited from delivering; and (ii) deliver, as appropriate,  either (A) to
the Holder, a new Agreement  evidencing the right of the Holder to purchase that
number of shares of Common Stock obtained by multiplying the number of shares of
Common Stock for which the surrendered  Agreement was exercisable at the time of
delivery of the notice of  repurchase  by a fraction,  the numerator of which is
the Option  Repurchase Price less the portion thereof  theretofore  delivered to
the Holder and the denominator of which is the Option Repurchase  Price,  and/or
(B) to the Owner,  a certificate  for the Option Shares it is then so prohibited
from  repurchasing.  If an Exercise  Termination  Event shall have occurred less
than 30 days  prior to the date of the notice by Issuer  described  in the first
sentence  of this  subsection  (c), or shall be  scheduled  to occur at any time
before the  expiration  of a period ending on the thirtieth day after such date,
the Holder  shall  nonetheless  have the right to exercise  the Option until the
expiration  of such 30-day  period  after the date of the  Exercise  Termination
Event or the notice date, respectively.

     (d) For purposes of this  Section 7, a Repurchase  Event shall be deemed to
have occurred (i) upon the consummation of any merger,  consolidation or similar
transaction involving Issuer or any purchase,  lease or other acquisition of all
or a majority of the assets of Issuer on a  consolidated  basis,  other than any
such transaction which would not constitute an Acquisition  Transaction pursuant
to the proviso to Section  2(b)(i)  hereof or (ii) upon the  acquisition  by any
person of beneficial  ownership of 50% or more of the then outstanding shares of
Common Stock;  provided that no such event shall  constitute a Repurchase  Event
unless a Subsequent  Triggering  Event shall have occurred  prior to an Exercise
Termination  Event.  The  parties  hereto  agree that  Issuer's  obligations  to
repurchase  the Option or Option Shares under this Section 7 shall not terminate
upon the  occurrence  of an  Exercise  Termination  Event  unless no  Subsequent
Triggering  Event shall have  occurred  prior to the  occurrence  of an Exercise
Termination Event.

     8.  Substitute  Option.  (a)  In  the  event  that  prior  to  an  Exercise
Termination Event,  Issuer shall enter into an agreement (i) to consolidate with
or  merge  into  any  person,  other  than  Grantee  or any of its  Subsidiaries
(collectively,  "Excluded  Persons")  and Issuer shall not be the  continuing or
surviving  corporation  of such  consolidation  or  merger,  (ii) to permit  any
person,  other than an Excluded Person, to merge into Issuer and Issuer shall be
the continuing or surviving or acquiring  corporation,  but, in connection  with
such merger,  the then outstanding  shares of Common Stock shall be changed into
or exchanged  for stock or other  securities  of any other person or cash or any
other property or the then  outstanding  shares of Common Stock shall after such
merger represent less than 50% of the outstanding voting shares and voting share
equivalents  of the merged or acquiring  company,  or (iii) to sell or otherwise
transfer  all or  substantially  all of its assets to any person,  other than an
Excluded  Person,  then,  and in each such case,  the agreement  governing  such
transaction  shall make  proper  provision  so that the Option  shall,  upon the
consummation of any such transaction and upon the terms and conditions set forth
herein,  be  converted  into,  or  exchanged  for,  an option  (the  "Substitute
Option"), at the election of the Holder, of either (x) the Acquiring Corporation
(as  hereinafter  defined)  or  (y)  any  person  that  controls  the  Acquiring
Corporation.

     (b) The following terms have the meanings indicated:

     (i)  "Acquiring  Corporation"  shall mean (i) the  continuing  or surviving
person of a  consolidation  or merger with Issuer (if other than  Issuer),  (ii)
Issuer in a merger in which Issuer is the  continuing  or surviving or acquiring
person, and (iii) the transferee of all or substantially all of Issuer's assets.

     (ii) "Substitute Shares" shall mean the shares of capital stock (or similar
equity  interest)  with the greatest  voting power in respect of the election of
directors (or other persons similarly  responsible for direction of the business
and affairs) of the issuer of the Substitute Option.

     (iii)  "Assigned  Value"  shall mean the  market/offer  price as defined in
Section 7.

     (iv) "Average  Price" shall mean the average  closing price per  Substitute
Share,  on the  principal  trading  market on which  such  shares  are traded as
reported  by a  recognized  source,  for the 20 trading  day period  immediately
preceding the consolidation,  merger or sale in question, but in no event higher
than the  closing  price of the  Substitute  Shares  on such  market  on the day
preceding  such  consolidation,  merger or sale;  provided that if Issuer is the
issuer of the  Substitute  Option,  the Average  Price  shall be  computed  with
respect to a share of common stock  issued by the person  merging into Issuer or
by any company which controls or is controlled by such person, as the Holder may
elect.

     (c) The Substitute Option shall have the same terms as the Option, provided
that if the terms of the  Substitute  Option cannot,  for legal reasons,  be the
same as the  Option,  such terms shall be as similar as possible to the terms of
the Option  and (to the extent  permitted  by  applicable  law) in no event less
advantageous to the Holder. The issuer of the Substitute Option shall also enter
into an agreement  with the then Holder or Holders of the  Substitute  Option in
substantially  the same form as this  Agreement  (after  giving  effect for such
purpose  to the  provisions  of  Section 9  hereof),  which  agreement  shall be
applicable to the Substitute Option.

     (d)  The  Substitute  Option  shall  be  exercisable  for  such  number  of
Substitute  Shares as is equal to the Assigned Value multiplied by the number of
shares of Common Stock for which the Option was exercisable immediately prior to
the event described in the first sentence of Section 8(a) hereof, divided by the
Average Price. The exercise price of the Substitute  Option per Substitute Share
shall then be equal to the Option Price multiplied by a fraction,  the numerator
of which shall be the number of shares of Common  Stock for which the Option was
exercisable  immediately  prior to the event  described in the first sentence of
Section  8(a)  hereof  and the  denominator  of  which  shall be the  number  of
Substitute  Shares for which the  Substitute  Option is  exercisable.  (e) In no
event, pursuant to any of the foregoing  paragraphs,  shall the number of shares
purchasable  upon  exercise  of  the  Substitute  Option  exceed  19.9%  of  the
Substitute  Shares then issued and outstanding at the time of exercise  (without
giving  effect to  Substitute  Shares  issued or issuable  under the  Substitute
Option).  In the event that the Substitute  Option would be exercisable for more
than  19.9% of the  Substitute  Shares  then  issued  and  outstanding  prior to
exercise  but for this  clause  (e),  the issuer of the  Substitute  Option (the
"Substitute  Option  Issuer")  shall make a cash  payment to Holder equal to the
excess of (i) the value of the  Substitute  Option  without giving effect to the
limitation in this clause (e) over (ii) the value of the Substitute Option after
giving effect to the  limitation  in this clause (e).  This  difference in value
shall be determined by a nationally  recognized investment banking firm selected
by Grantee (or, if Grantee is not then the Holder owning Options with respect to
the largest number of Shares,  the largest Holder) and reasonably  acceptable to
Issuer, which determination,  absent manifest error, shall be conclusive for all
purposes of this Agreement.

     (f) In addition to any other restrictions or covenants,  Issuer agrees that
it shall not enter or agree to enter into any  transaction  described in Section
8(a) hereof  unless (i) the Acquiring  Corporation  and any person that controls
the  Acquiring  Corporation  assume in  writing  all the  obligations  of Issuer
hereunder  and (ii) the  Substitute  Option  Issuer  agrees to comply  with this
Section 8 and agrees to take all action necessary to prevent the exercise of any
rights of any  holder of  Substitute  Shares or shares of  capital  stock of any
successor  to the  Substitute  Option  Issuer that any holder of the  Substitute
Option  (each such  person  being  referred  to herein as a  "Substitute  Option
Holder") or any holder of Substitute  Shares (each such person being referred to
herein as a "Substitute  Share Owner") purchased upon exercise of the Substitute
Option by a Substitute  Option  Holder  would be  prohibited  or precluded  from
exercising  or the  exercise of which would  adversely  affect the rights of any
Substitute  Option Holder under the agreement for such Substitute  Option or the
transactions contemplated by the Merger Agreement.

     9.  Repurchase  of  Substitute  Option.  (a) At the  written  request  of a
Substitute  Option  Holder,  the Substitute  Option Issuer shall  repurchase the
Substitute  Option from the Substitute Option Holder at a price (the "Substitute
Option  Repurchase  Price") equal to the amount by which (i) the Highest Closing
Price (as hereinafter defined) exceeds (ii) the exercise price of the Substitute
Option  multiplied by the number of Substitute  Shares for which the  Substitute
Option may then be exercised,  and at the request of the Substitute Share Owner,
the Substitute  Option Issuer shall repurchase the Substitute  Shares at a price
(the  "Substitute  Share  Repurchase  Price") equal to the Highest Closing Price
multiplied by the number of Substitute  Shares so designated.  The term "Highest
Closing  Price"  shall mean the highest  average  closing  price for  Substitute
Shares for any 20 trading day period within the three-month  period  immediately
preceding  the date the  Substitute  Option  Holder gives notice of the required
repurchase of the Substitute  Option or the Substitute  Share Owner gives notice
of the required repurchase of the Substitute Shares, as applicable.

     (b) The  Substitute  Option Holder and the Substitute  Share Owner,  as the
case may be, may exercise its respective rights to require the Substitute Option
Issuer to repurchase the Substitute Option and the Substitute Shares pursuant to
this Section 9 by surrendering for such purpose to the Substitute Option Issuer,
at its principal  office,  the agreement for such Substitute  Option (or, in the
absence of such an agreement,  a copy of this Agreement) and/or certificates for
Substitute  Shares  accompanied by a written notice or notices  stating that the
Substitute  Option  Holder or the  Substitute  Share Owner,  as the case may be,
elects to require the  Substitute  Option  Issuer to repurchase  the  Substitute
Option and/or the  Substitute  Shares in accordance  with the provisions of this
Section 9. As promptly as practicable and in any event within five business days
after the surrender of the Substitute  Option and/or  certificates  representing
Substitute  Shares and the receipt of such notice or notices  relating  thereto,
the  Substitute  Option  Issuer  shall  deliver or cause to be  delivered to the
Substitute  Option Holder the Substitute  Option  Repurchase Price and/or to the
Substitute  Share Owner the Substitute  Share  Repurchase  Price therefor or the
portion thereof which the Substitute  Option Issuer is not then prohibited under
applicable law and regulation from so delivering.

     (c) To the extent that the  Substitute  Option Issuer is  prohibited  under
applicable law or regulation from  repurchasing the Substitute Option and/or the
Substitute  Shares  in part or in  full,  the  Substitute  Option  Issuer  shall
promptly so notify the  Substitute  Option  Holder and/or the  Substitute  Share
Owner and thereafter deliver or cause to be delivered, from time to time, to the
Substitute Option Holder and/or the Substitute Share Owner, as appropriate,  the
portion of the Substitute  Option  Repurchase  Price and/or the Substitute Share
Repurchase  Price,   respectively,   which  it  is  no  longer  prohibited  from
delivering, within five (5) business days after the date on which the Substitute
Option  Issuer  is no  longer  so  prohibited;  provided,  however,  that if the
Substitute Option Issuer is at any time after delivery of a notice of repurchase
pursuant to subsection (b) of this Section 9 is prohibited  under applicable law
or  regulation  from  delivering  to the  Substitute  Option  Holder  and/or the
Substitute Share Owner, as appropriate,  the Substitute  Option Repurchase Price
and the  Substitute  Share  Repurchase  Price,  respectively,  in full  (and the
Substitute  Option  Issuer  shall use its best  efforts to receive all  required
regulatory and legal approvals as promptly as practicable in order to accomplish
such repurchase), the Substitute Option Holder and/or Substitute Share Owner may
revoke its  notice of  repurchase  of the  Substitute  Option or the  Substitute
Shares either in whole or to the extent of the  prohibition,  whereupon,  in the
latter case,  the  Substitute  Option  Issuer shall  promptly (i) deliver to the
Substitute Option Holder or Substitute Share Owner, as appropriate, that portion
of the Substitute  Option  Repurchase  Price or the Substitute  Share Repurchase
Price that the Substitute  Option Issuer is not prohibited from delivering;  and
(ii) deliver, as appropriate,  either (A) to the Substitute Option Holder, a new
Substitute  Option  evidencing  the  right of the  Substitute  Option  Holder to
purchase that number of Substitute  Shares obtained by multiplying the number of
Substitute Shares for which the surrendered Substitute Option was exercisable at
the time of delivery of the notice of repurchase by a fraction, the numerator of
which  is the  Substitute  Option  Repurchase  Price  less the  portion  thereof
theretofore  delivered to the  Substitute  Option Holder and the  denominator of
which is the Substitute Option  Repurchase  Price,  and/or (B) to the Substitute
Share  Owner,  a  certificate  for the  Substitute  Option  Shares it is then so
prohibited  from  repurchasing.  If an  Exercise  Termination  Event  shall have
occurred  less than 30 days  prior to the date of the  notice by the  Substitute
Option Issuer  described in the first sentence of this  subsection (c), or shall
be scheduled to occur at any time before the  expiration  of a period  ending on
the  thirtieth  day  after  such  date,  the  Substitute   Option  Holder  shall
nevertheless  have  the  right to  exercise  the  Substitute  Option  until  the
expiration  of such 30-day  period  after the date of the  Exercise  Termination
Event or the notice date, respectively.

     10. Extension.  The period for exercise of certain rights under Sections 2,
6, 7, 9 and 12 hereof shall be extended:  (i) to the extent  necessary to obtain
all governmental  and regulatory  approvals for the exercise of such rights (for
so long as the Holder,  Substitute  Option Holder or Substitute  Share Owner, as
the case may be, is using its reasonable  best efforts to obtain such regulatory
approvals), and for the expiration of all statutory waiting periods; (ii) during
any period for which an  injunction  or similar  legal  prohibition  on exercise
shall be in  effect;  (iii) to the extent  necessary  to avoid  liability  under
Section  16(b) of the Exchange Act by reason of such  exercise;  and (iv) by the
number of days by which Issuer shall have delayed any  registration  pursuant to
Section 6(d) hereof.

     11.  Representations  and  Warranties.  (a) Issuer  hereby  represents  and
warrants to Grantee as follows:

     (i) Issuer has full  corporate  power and  authority to execute and deliver
this  Agreement and to consummate  the  transactions  contemplated  hereby.  The
execution  and  delivery  of  this  Agreement  and  the   consummation   of  the
transactions  contemplated  hereby have been duly and validly  authorized by the
Board of Directors of Issuer and no other  corporate  proceedings on the part of
Issuer  are  necessary  to  authorize   this  Agreement  or  to  consummate  the
transactions so contemplated.  This Agreement has been duly and validly executed
and delivered by Issuer and constitutes a valid and legally  binding  obligation
of  Issuer   enforceable   in   accordance   with  its  terms  (except  as  such
enforceability   may  be   limited   by   applicable   bankruptcy,   insolvency,
reorganization,  moratorium,  fraudulent  transfer  and similar  laws of general
applicability  relating to or affecting  creditors'  rights or by general equity
principles, whether such principles are considered at law or in equity).

     (ii)  Issuer has taken all  necessary  corporate  action to  authorize  and
reserve and to permit it to issue, and at all times from the date hereof through
the  termination  of this  Agreement  in  accordance  with its  terms  will have
reserved for issuance upon the exercise of the Option,  that number of shares of
Common  Stock equal to the maximum  number of shares of Common Stock at any time
and from time to time  issuable  hereunder,  and all such shares,  upon issuance
pursuant to the Option,  will be duly  authorized,  validly issued,  fully paid,
nonassessable,  and will be  delivered  free and  clear  of all  claims,  liens,
encumbrances and security interests and not subject to any preemptive rights.

     (iii) The execution, delivery and performance of this Agreement does not or
will not, and the consummation by Issuer of any of the transactions contemplated
hereby  will not,  constitute  or result  in (i) a breach or  violation  of or a
default under, its articles or certificate of  incorporation or by-laws,  or the
comparable governing instruments of any of its subsidiaries, or (ii) a breach or
violation of or a default under, any agreement, lease, contract, note, mortgage,
indenture,  arrangement  or other  obligation  of it or any of its  subsidiaries
(with or without  the giving of notice,  the lapse of time or both) or under any
law,  rule,  ordinance  or  regulation  or  judgment,  decree,  order,  award or
governmental  or  non-governmental  permit or  license to which it or any of its
subsidiaries  is subject,  except where such breach,  violation or default would
not in the aggregate  have a Material  Adverse  Effect (as defined in the Merger
Agreement) and would not materially  impair  Issuer's  ability to consummate the
transactions contemplated by this Agreement.

     (b) Grantee hereby  represents and warrants to Issuer that Grantee has full
corporate  power and  authority  to enter into this  Agreement  and,  subject to
obtaining  the  approvals  referred  to in this  Agreement,  to  consummate  the
transactions  contemplated by this Agreement; the execution and delivery of this
Agreement and the consummation of the transactions contemplated hereby have been
duly authorized by all necessary  corporate  action on the part of Grantee;  and
this Agreement has been duly executed and delivered by Grantee and constitutes a
valid and legally binding  obligation of Grantee  enforceable in accordance with
its  terms  (except  as  such   enforceability  may  be  limited  by  applicable
bankruptcy,  insolvency,  reorganization,  moratorium,  fraudulent  transfer and
similar laws of general applicability relating to or affecting creditors' rights
or by general equity  principles,  whether such principles are considered at law
or in equity).

     12. Assignment.  Neither of the parties hereto may assign any of its rights
or obligations under this Agreement or the Option created hereunder to any other
person,  without the express written consent of the other party,  except that in
the event a Subsequent Triggering Event shall have occurred prior to an Exercise
Termination Event, Grantee, subject to the express provisions hereof, may assign
in whole or in part its rights and  obligations  hereunder  within  twelve  (12)
months  following  such  Subsequent  Triggering  Event (or such later  period as
provided in Section 10 hereof) provided that the assignee  executes a supplement
to this Agreement agreeing to be bound by this Agreement's terms.

     13.  Filings;  Other  Actions.  Each of  Grantee  and  Issuer  will use its
reasonable best efforts to make all filings with, and to obtain consents of, all
third  parties and  regulatory  and  governmental  authorities  necessary to the
consummation of the  transactions  contemplated  by this  Agreement,  including,
without limitation, notices and filings under HSR.

     14. Best Efforts.  Each of Grantee and Issuer will use its reasonable  best
efforts to make all filings with,  and to obtain  consents of, all third parties
and governmental  authorities necessary for the consummation of the transactions
contemplated by this Agreement,  including without limitation making application
to list the shares of Common Stock  issuable  hereunder on Nasdaq upon  official
notice of issuance.

     15. Specific Performance. The parties hereto acknowledge that damages would
be an  inadequate  remedy for a breach of this  Agreement by either party hereto
and that the  obligations  of the parties  hereto shall be enforceable by either
party hereto through injunctive or other equitable relief.

     16. Severability. If any term, provision, covenant or restriction contained
in this Agreement is held by a court or a federal or state regulatory  agency of
competent  jurisdiction to be invalid,  void or unenforceable,  the remainder of
the terms, provisions and covenants and restrictions contained in this Agreement
shall remain in full force and effect, and shall in no way be affected, impaired
or  invalidated.  If for any reason such court or regulatory  agency  determines
that the Holder is not  permitted  to acquire,  or Issuer or  Substitute  Option
Issuer, as applicable, is not permitted to repurchase pursuant to Section 7 or 9
hereof,  as  applicable,  the full number of shares of Common Stock  provided in
Section 1(a) hereof (as adjusted  pursuant to Section 1(b) or Section 5 hereof),
it is the  express  intention  of Issuer to allow the  Holder to  acquire  or to
require Issuer to repurchase such lesser number of shares as may be permissible,
without any amendment or modification hereof.

     17.   Notices.   All   notices,   requests,   claims,   demands  and  other
communications  hereunder shall be deemed to have been duly given when delivered
in person,  by fax,  telecopy,  or by  registered  or  certified  mail  (postage
prepaid,  return receipt  requested) at the respective  addresses of the parties
set forth in the Merger  Agreement or such other address as shall be provided in
writing.

     18.  Governing Law. This Agreement shall be governed by, and interpreted in
accordance  with,  the laws of the  State of New  York,  without  regard  to the
conflicts of laws principles thereof.

     19.   Counterparts.   This  Agreement  may  be  executed  in  one  or  more
counterparts, each of which shall be deemed to constitute an original.

     20. Expenses.  Except as otherwise  expressly provided herein,  each of the
parties  hereto shall bear and pay all costs and  expenses  incurred by it or on
its behalf in connection with the transactions contemplated hereunder, including
fees  and  expenses  of  its  own  financial  consultants,  investment  bankers,
accountants and counsel.

     21. Entire Agreement.  Except as otherwise  expressly provided herein or in
the Merger Agreement,  this Agreement  contains the entire agreement between the
parties with respect to the transactions  contemplated  hereunder and supersedes
all prior arrangements or understandings with respect thereof,  written or oral.
The terms and conditions of this Agreement  shall inure to the benefit of and be
binding upon the parties  hereto and their  respective  successors and permitted
assignees.  Nothing in this  Agreement,  expressed  or  implied,  is intended to
confer  upon any party,  other than the  parties  hereto,  and their  respective
successors except as assignees, any rights, remedies, obligations or liabilities
under or by reason of this Agreement, except as expressly provided herein.

     22. Limitation on Profit. (a)  Notwithstanding  any other provision of this
Agreement, in no event shall the Grantee's Total Profit (as hereinafter defined)
exceed $16.5 million and, if it otherwise would exceed this amount, the Grantee,
at its sole  election,  shall  either  (i) reduce the number of shares of Common
Stock  subject to this  Option  (or the number of shares of common  stock of the
Substitute Option Issuer subject to this Substitute Option, as the case may be),
(ii) deliver to the Issuer (or Substitute Option Issuer) for cancellation Option
Shares (or Substitute Shares) previously purchased by Grantee, (iii) pay cash to
the Issuer (or Substitute Option Issuer),  or (iv) any combination  thereof,  so
that Grantee's realized Total Profit shall not exceed $16.5 million after taking
into account the foregoing  actions;  provided,  that the amounts referred to in
this Section 22(a) shall be reduced by any amount received by Grantee in respect
of the Termination Fee pursuant to Section 8.02(b)(ii) of the Merger Agreement.

     (b) Notwithstanding any other provision of this Agreement,  this Option (or
Substitute  Option) may not be exercised for a number of shares as would,  as of
the date of exercise, result in a Notional Total Profit (as defined below) which
would exceed  $16.5  million;  provided,  that  nothing in this  sentence  shall
restrict any exercise of the Option (or Substitute  Option)  permitted hereby on
any subsequent  date; and provided  further that the amount  referred to in this
Section  22(b) shall be reduced by any amount  received by Grantee in respect of
the Termination Fee pursuant to Section 8.02(b)(ii) of the Merger Agreement.

     (c) As used in this  Agreement,  the term  "Total  Profit"  shall  mean the
aggregate amount (before taxes) of the following: (i) (x) the amount received by
Grantee and any other Holder or Substitute  Option  Holder  pursuant to Issuer's
repurchase  of the  Option (or any  portion  thereof)  or any  Option  Shares in
accordance with Section 7, or pursuant to Substitute Option Issuer's  repurchase
of the Substitute  Option (or any portion  thereof) or any Substitute  Shares in
accordance  with Section 9, less, in the case of any repurchase of Option Shares
or Substitute  Shares,  (y) the  Grantee's and any other  Holder's or Substitute
Option Holder's  purchase price for such Option Shares or Substitute  Shares, as
the case may be, (ii) (x) the net cash amounts (and the fair market value of any
other  consideration)  received  by Grantee and any other  Holder or  Substitute
Option Holder pursuant to the sale of Option Shares or Substitute Shares (or any
other  securities  into  which  such  Option  Shares or  Substitute  Shares  are
converted or exchanged) to any  unaffiliated  party,  less (y) the Grantee's (or
any other Holder's or Substitute  Option Holder's)  purchase price of the Option
Shares or Substitute Shares, and (iii) the net cash amounts (and the fair market
value of any other  consideration)  received by Grantee (or any other  Holder or
Substitute Option Holder) on the transfer of the Option or Substitute Option (or
any portion thereof) to any unaffiliated  party. In the case of clauses (ii) (x)
and (iii) above, the Grantee and any Holder or Substitute Option Holder agree to
furnish as promptly as reasonably  practicable after any disposition of all or a
portion of the Option or Option Shares or of the Substitute Option or Substitute
Shares a complete and correct  statement,  certified by a responsible  executive
officer or partner of the Grantee or Holder or Substitute  Option Holder, of the
net cash amounts (and the fair market value of any other consideration) received
in connection with any sale or transfer of the Option or Option Shares or of the
Substitute Option or Substitute Shares.

     (d) As used in this  Agreement,  the  term  "Notional  Total  Profit"  with
respect  to any  number of shares as to which  Grantee  and any other  Holder or
Substitute  Option  Holder may  propose to exercise  this  Option or  Substitute
Option  shall be the Total  Profit  determined  as of the date of this  proposal
assuming that this Option or Substitute  Option were  exercised on such date for
this number of shares and  assuming  that such shares,  together  with all other
Option  Shares or  Substitute  Shares held by Grantee  and any other  Holders or
Substitute Option Holders and their respective  affiliates as of such date, were
sold for cash at the closing  market  price for the Common  Stock (or the common
stock of the Substitute  Option  Issuer,  as the case may be) as of the close of
business on the preceding trading day (less customary brokerage commissions).

     23. Captions;  Capitalized Terms. The section and paragraph captions herein
are for  convenience of reference only, do not constitute part of this Agreement
and  shall  not be deemed to limit or  otherwise  affect  any of the  provisions
hereof.  Capitalized  terms used in this  Agreement and not defined herein shall
have the meanings assigned thereto in the Merger Agreement.



<PAGE>


     IN WITNESS  WHEREOF,  each of the parties has caused this  Agreement  to be
executed on its behalf by its officers thereunto duly authorized,  all as of the
date first above written.

                                                 NORTEL NETWORKS CORPORATION


                                             By: /s/
                                                 ------------------------------
                                                 Name:
                                                 Title:

                                            By: /s/
                                                 ------------------------------
                                                 Name:
                                                 Title:


                                                 PERIPHONICS CORPORATION


                                             By: /s/
                                                 ------------------------------
                                                 Name:
                                                 Title:







STOCKHOLDERS AGREEMENT

     This  STOCKHOLDERS  AGREEMENT  (this  "Agreement"),  dated as of August 24,
1999,  is entered into by and among Peter J. Cohen,  George W. Cole,  Richard A.
Daniels,  Kevin J. O'Brien and Jayandra Patel (each a  "Stockholder  Party") and
Nortel Networks  Corporation,  a corporation  organized under the laws of Canada
("Nortel").

     WHEREAS, simultaneously with the execution of this Agreement, Nortel, North
Subsidiary,  Inc., a wholly owned subsidiary of Nortel ("Sub"),  and Periphonics
Corporation, a corporation organized under the laws of Delaware (the "Company"),
are entering into an Agreement  and Plan of Merger,  dated as of the date hereof
(as the same may be amended or supplemented,  the "Merger Agreement") providing,
among  other  things,  for either the Merger of Sub with and into the Company or
the Merger of the Company with and into Sub (the "Merger"); and

     WHEREAS,  as of the date hereof,  each Stockholder  Party is the Beneficial
Owner (as defined  below) of, and has the sole right to vote and dispose of, the
shares  of common  stock,  par value  $0.01  per share of the  Company  ("Common
Stock"), set forth in Schedule A (the "Owned Shares"); and

     WHEREAS, as an inducement and a condition to their entering into the Merger
Agreement and incurring the obligations  set forth therein,  Nortel has required
that each Stockholder Party enter into this Agreement;

     NOW, THEREFORE,  in consideration of the foregoing and the mutual premises,
representations,  warranties,  covenants and agreements  contained herein and in
the Merger Agreement,  the parties hereto, intending to be legally bound hereby,
agree as follows:

     1.  Certain  Definitions.  Capitalized  terms used but not  defined in this
Agreement are used in this  Agreement  with the meanings  given to such terms in
the Merger Agreement. In addition, for purposes of this Agreement:

     "Affiliate"  means, with respect to any specified  Person,  any Person that
directly,  or indirectly  through one or more  intermediaries,  controls,  or is
controlled  by, or is under  common  control  with,  the Person  specified.  For
purposes of this Agreement,  with respect to any Stockholder Party,  "Affiliate"
shall not  include the Company and the  Persons  that  directly,  or  indirectly
through one or more intermediaries, are controlled by the Company.

     "Alternative Transaction" has the meaning set forth in Section 2(b) hereof.

     "Beneficially  Owned"  or  "Beneficial   Ownership"  with  respect  to  any
securities means having  beneficial  ownership of such securities (as determined
pursuant to Rule 13d-3 under the Exchange Act,  disregarding  the phrase "within
60 days" in paragraph (d)(1)(i)  thereof),  including pursuant to any agreement,
arrangement or  understanding,  whether or not in writing.  Without  duplicative
counting of the same  securities  by the same  holder,  securities  Beneficially
Owned by a Person shall include securities  Beneficially Owned by all Affiliates
of such Person and all other  Persons with whom such Person  would  constitute a
"Group"  within the meaning of Section  13(d) of the  Exchange Act and the rules
promulgated thereunder.

     "Beneficial  Owner" with respect to any  securities  means a Person who has
Beneficial Ownership of such securities.

     "Company Meeting" has the meaning set forth in Section 3 hereof.

     "Proposed Business Combination" means the transactions  contemplated by the
Merger Agreement.

     "Transfer" means, with respect to a security,  the sale, transfer,  pledge,
hypothecation,  encumbrance,  assignment or  disposition of such security or the
Beneficial  Ownership thereof,  the offer to make such a sale, transfer or other
disposition, and each option, agreement,  arrangement or understanding,  whether
or not in writing, to effect any of the foregoing.  As a verb,  "Transfer" shall
have a correlative meaning.

     2. No Disposition or Solicitation.

     (a) Each  Stockholder  Party  agrees  that from and after the date  hereof,
except as  contemplated  by this  Agreement,  he will not  Transfer  or agree to
Transfer any Common  Stock  Beneficially  Owned by him other than with  Nortel's
prior written consent, or grant any proxy or  power-of-attorney  with respect to
any such Common  Stock other than  pursuant to this  Agreement;  provided,  that
nothing in this Section 2(a) shall prohibit any Stockholder Party from effecting
any Transfer of Common Stock Beneficially Owned by him (i) by will or applicable
laws of descent and  distribution or (ii) to any member of the immediate  family
of such Stockholder  Party, or any trust,  limited  partnership or other similar
entity the  Beneficial  Ownership of which is held by the  Stockholder  Party or
such family members (each a "Permitted  Transferee"),  so long as such Permitted
Transferee agrees in writing, in form and substance  reasonably  satisfactory to
Nortel,  to be bound by the terms of this  Agreement  to the same extent as such
Stockholder Party is bound.

     (b) Each  Stockholder  Party  agrees  that from and after the date  hereof,
except as  contemplated  by this  Agreement  or,  solely in his  capacity  as an
officer or director of the Company, as permitted by the Merger Agreement, he and
his Affiliates  and  representatives,  will not directly or indirectly  solicit,
initiate,  or encourage  any inquiries or proposals  from,  discuss or negotiate
with,  or provide any  non-public  information  to, any Person  relating  to, or
otherwise  facilitate  any  tender or  exchange  offer,  proposal  for a merger,
consolidation or other business combination  involving the Company or any of its
subsidiaries  or any  proposal  or offer to acquire in any manner a  substantial
equity  interest in, or a  substantial  portion of the assets of, the Company or
any of its  subsidiaries  other  than  the  Proposed  Business  Combination  (an
"Alternative Transaction").

     (c) Each  Stockholder  Party agrees that unless required by applicable law,
neither  he nor any of his  Affiliates  shall  make any  press  release,  public
announcement  or other  communication  with respect to Nortel or the business or
affairs of the Company,  including this  Agreement and the Merger  Agreement and
the  transactions  contemplated  hereby and thereby,  without the prior  written
consent of Nortel.

     3. Stockholder  Vote; Offer. Each Stockholder Party agrees that (i) at such
time as the Company  conducts a meeting of or otherwise  seeks a vote or consent
of its  stockholders  for the purpose of approving the Merger  Agreement and the
Merger (such meeting or any adjournment  thereof,  or such consent process,  the
"Company  Meeting"),  he will vote,  or provide a consent  with  respect to, all
Common Stock  (including the Owned Shares) then  Beneficially  Owned by him over
which he has voting power ("Voting Shares") in favor of the Merger Agreement and
the  Merger,  provided  that he shall not be  required to vote for, or provide a
consent  with  respect  to,  any action  that would  reduce the number of Nortel
Common  Shares to be  received  by him in  respect  of his  Common  Stock in the
Merger, and (ii) he will (at any meeting of stockholders) vote his Voting Shares
against,  and he will not consent to, any Alternative  Transaction or any action
that would delay,  prevent or frustrate  the  transactions  contemplated  by the
Merger Agreement.

     Without limiting the foregoing, it is understood that the obligations under
clause  (i)  above  shall  remain  applicable  in  respect  of each  meeting  of
stockholders  of the Company duly called for the purpose of approving the Merger
Agreement  and the Merger  regardless of the position of the Company Board as to
the Merger at the time of such meeting,  and that the  obligations  under clause
(ii) above shall continue to the extent set forth in Section 10.

     4. Reasonable Efforts to Cooperate. Each Stockholder Party will (a) use all
reasonable  efforts to cooperate with the Company,  Nortel and Sub in connection
with the transactions  contemplated by the Merger  Agreement,  (b) promptly take
such actions as are necessary or appropriate to consummate such transactions and
(c) provide any information  reasonably requested by the Company,  Nortel or Sub
for any  regulatory  application  or filing  made or  approval  sought  for such
transactions (including filings with the SEC).

     5.  Additional  Stock.  Each  Stockholder  Party agrees that any additional
shares of Common  Stock  acquired  by him or over which he  acquires  Beneficial
Ownership,  whether  pursuant to existing stock option  agreements,  warrants or
otherwise, shall be subject to the provisions of this Agreement.

     6.  Irrevocable  Proxy.  (i) In furtherance of the agreements  contained in
Section 3 of this Agreement,  each Stockholder Party hereby  irrevocably  grants
to, and  appoints,  Nortel and J.A.  Roth,  Vice  Chairman  and Chief  Executive
Officer of Nortel,  F.A. Dunn, Senior Vice President and Chief Financial Officer
of  Nortel,  and  W.R.  Kerr,  Senior  Vice  President,   Finance  and  Business
Development,  of Nortel,  in their respective  capacities as officers of Nortel,
and any individual who shall hereafter succeed to any such office of Nortel, and
each of them individually,  such Stockholder Party's proxy and  attorney-if-fact
(with full power of substitution),  for and in the name, place and stead of such
Stockholder  Party,  to  vote  all  Voting  Shares  Beneficially  Owned  by such
Stockholder  Party,  or grant a consent or  approval  in respect of such  Voting
Shares,  or execute and deliver a proxy to vote such Voting Shares,  (x) subject
to the proviso set forth in clause (i) of the first  paragraph  of Section 3, in
favor of the Merger and the Merger  Agreement  and approval of the terms thereof
and each of the other transactions  contemplated by the Merger Agreement and (y)
against any  Alternative  Transaction or any other matter  referred to in clause
(ii) of the first sentence of Section 3 hereof.

     (ii) Each  Stockholder  Party  represents  and  warrants to Nortel that any
proxies  heretofore  given in respect of his Voting Shares are not  irrevocable,
and hereby revokes any such proxies.

     (iii) Each Stockholder  Party hereby affirms that the irrevocable proxy set
forth in this Section 6 is given in connection  with, and in  consideration  of,
the  execution  of the  Merger  Agreement  by  Nortel  and Sub,  and  that  such
irrevocable  proxy is given to  secure  the  performance  of the  duties of such
Stockholder  Party under this Agreement.  Each Stockholder  Party hereby further
affirms that the irrevocable  proxy is coupled with an interest and may under no
circumstances be revoked.  Such  Stockholder  Party hereby ratifies and confirms
all that such  irrevocable  proxy may  lawfully do or cause to be done by virtue
hereof.  Such  irrevocable  proxy is executed and intended to be  irrevocable in
accordance  with  the  provisions  of  Section  218  of  the  Delaware   General
Corporation  Law.  The proxy  granted in this Section 6 shall remain valid until
terminated  pursuant  to  Section  10 hereof or until  earlier  terminated  with
respect to shares of Common Stock that are  Transferred in accordance  with this
Agreement.

     7. Covenant of Stockholder  Parties.  Each Stockholder Party agrees that he
will take all action necessary to (i) permit (a) his Owned Shares to be acquired
in the Merger and (b) the voting of his  Voting  Shares in  accordance  with the
terms of this  Agreement and (ii) prevent  creditors in respect of any pledge of
his Owned Shares from exercising their rights under such pledge.

     8.  Representations,  Warranties and Covenants of Stockholder Parties. Each
Stockholder  Party hereby represents and warrants to, and agrees with, Nortel as
follows:

     (a) Such Stockholder  Party has all necessary power and authority and legal
capacity to execute  and  deliver  this  Agreement  and perform his  obligations
hereunder.

     (b) This Agreement has been duly and validly executed and delivered by such
Stockholder  Party  and  constitutes  the valid and  binding  agreement  of such
Stockholder Party, enforceable against such Stockholder Party in accordance with
its terms except to the extent limited by (i) applicable bankruptcy,  insolvency
or similar laws affecting  creditors' rights or (ii) general equity  principles,
whether considered at law or in equity.

     (c)  Each  Stockholder  Party  is the sole  Beneficial  Owner of his  Owned
Shares.  Each Stockholder Party has good and marketable title (which may include
holding in nominee or "street" name) to all of his Owned Shares,  free and clear
of all liens, claims, options, proxies, voting agreements and security interests
(other than as created by this  Agreement  and  restrictions  on Transfer  under
applicable securities laws). Except as set forth in Schedule A, the Owned Shares
constitute  all of the capital stock of the Company  Beneficially  Owned by such
Stockholder  Party and neither such Stockholder  Party nor his Affiliates is the
Beneficial Owner of, or has any right to acquire  (whether  currently upon lapse
of time,  following the  satisfaction of any conditions,  upon the occurrence of
any  event  or any  combination  of  the  foregoing)  any  Common  Stock  or any
securities convertible into or exchangeable or exercisable for Common Stock.

     (d)  Neither  the  execution  and  delivery  of  this   Agreement  by  each
Stockholder Party nor the consummation of the transactions  contemplated  hereby
will (i) conflict with, result in any violation of, require any consent under or
constitute  a  default  (whether  with  notice or lapse of time or both) by such
Stockholder Party under any mortgage, bond, indenture,  agreement, instrument or
obligation  to  which  such  Stockholder  Party  is a  party  or by  which  such
Stockholder  Party or any of the  Voting  Shares  is  bound;  (ii)  violate  any
judgment, order, injunction, decree or award of any court, administrative agency
or  governmental  body  that is  binding  on such  Stockholder  Party;  or (iii)
constitute a violation by such Stockholder Party of any law or regulation of any
jurisdiction.

     (e) Each Stockholder Party understands and acknowledges that Nortel and Sub
are entering into the Merger Agreement in reliance upon such Stockholder Party's
execution,  delivery and performance of this Agreement.  Each Stockholder  Party
acknowledges  that his  irrevocable  proxy set forth in  Section 6 is granted in
consideration of the execution and delivery of the Merger Agreement by Nortel.

     9. Representations and Warranties of Nortel. Nortel represents and warrants
to the Stockholder Parties that Nortel has full corporate power and authority to
execute and deliver this Agreement and to perform its obligations hereunder. The
execution,  delivery  and  performance  of this  Agreement  by  Nortel  will not
constitute a violation of,  conflict with or result in a default under,  (i) any
contract, understanding or arrangement to which Nortel is a party or by which it
is bound or  requires  the  consent  of any other  Person or any party  pursuant
thereto,  (ii) any judgment,  decree or order applicable to Nortel, or (iii) any
law,  rule or  regulation  of any  governmental  body,  in each case  except for
violations,  conflicts or defaults that would not have a material adverse effect
on the ability of the Nortel to perform its  obligations  under this  Agreement;
and this Agreement  constitutes a legal, valid and binding agreement on the part
of Nortel,  enforceable  against Nortel in accordance with its terms,  except as
such enforceability may be limited by principles applicable to creditors' rights
generally or governing the availability of equitable  relief.  The execution and
delivery  by  Nortel of this  Agreement  and the  consummation  by Nortel of the
transactions  contemplated  hereby have been duly and validly  authorized by the
Board of Directors of Nortel and no other  corporate  proceedings on the part of
Nortel  are  necessary  to  authorize   this  Agreement  or  to  consummate  the
transactions  contemplated  hereby.  This  Agreement  has been duly and  validly
executed and delivered by Nortel.

     10.  Termination.  This  Agreement,  and all rights and  obligations of the
parties hereunder, shall terminate on the earlier of (a) the Effective Time; (b)
the date upon which the Merger  Agreement is terminated by the Company  pursuant
to Section  8.01(b)  thereof  (unless at such time  Nortel  would be entitled to
terminate, or following the giving of notice and lapse of time would be entitled
to terminate,  the Merger Agreement);  and (c) 30 days following the termination
of the Merger Agreement other than as set forth in (b) above; provided, however,
that the term of this  Agreement  shall be extended by a period of days equal to
the duration of any temporary or permanent order,  writ or injuction issued by a
court of  competent  jurisdiction  that  invalidates,  impedes  or  enjoins  the
operation  or  enforcement  of  this  Agreement,  the  Merger  Agreement  or any
agreement  contemplated hereby or thereby or entered into in connection herewith
or therewith.

     11. Miscellaneous.

     (a) This  Agreement  represents  the entire  understanding  of the  parties
hereto with  reference to the subject  matter hereof and  supersedes any and all
other oral or written agreements and understandings among the parties heretofore
made.

     (b) Each  Stockholder  Party agrees that this  Agreement and the respective
rights and obligations of such  Stockholder  Party hereunder shall attach to any
Common Stock, and any securities  convertible into such shares,  that may become
Beneficially Owned by such Stockholder Party.

     (c) Except as otherwise provided in this Agreement,  all costs and expenses
incurred in connection  with this  Agreement and the  transactions  contemplated
hereby shall be paid by the party incurring such expenses.

     (d) This Agreement and all of the  provisions  hereof shall be binding upon
and  inure to the  benefit  of the  parties  and  their  respective  successors,
personal   or   legal   representatives,   executors,   administrators,   heirs,
distributees,  devisees,  legatees  and  permitted  assigns,  but  neither  this
Agreement nor any of the rights,  interests or  obligations  hereunder  shall be
assigned by any party  (whether by  operation of law or  otherwise)  without the
prior written consent of the other parties; provided, that Nortel may assign any
or all rights under this  Agreement to Sub or any other  Subsidiary.  Nothing in
this  Agreement,  express or implied,  is  intended to or shall  confer upon any
other Person any rights,  benefits or remedies of any nature whatsoever under or
by reason of this Agreement.

     (e) This Agreement may not be amended, changed,  supplemented, or otherwise
modified or  terminated,  except upon the  execution  and  delivery of a written
agreement  executed  by the  parties  hereto;  provided,  that  Nortel may waive
compliance  by any other party with any  representation,  agreement or condition
otherwise  required to be complied with by any other party under this  Agreement
or release any other party from its obligations  under this  Agreement,  but any
such waiver or release shall be effective only if in writing executed by Nortel.

     (f) All notices and other communications  hereunder shall be in writing and
shall be deemed  given  upon (a)  transmitter's  confirmation  of a receipt of a
facsimile  transmission,  (b) confirmed delivery by a standard overnight carrier
or when  delivered by hand or (c) the expiration of five business days after the
day when mailed by certified or registered mail,  postage prepaid,  addressed at
the address for such party set forth below.

     (i) If to a Stockholder Party, to such Stockholder Party at the address set
forth beside its name on Schedule A hereto with a copy to:



<PAGE>


                                    Fried, Frank, Harris, Shriver & Jacobson
                                    1001 Pennsylvania Avenue
                                    Suite 800
                                    Washington, DC 20004
                                    Attention: Stephen I. Glover, Esq.
                                    Fax: (202) 639-7008
                                    Phone: (202) 639-7000

                           and another copy to:

                                    Ruskin, Moscou, Evans & Faltischek, P.C.
                                    170 Old Country Road
                                    Mineola, New York  11501
                                    Attention:  Norman Friedland, Esq.
                                    Fax: (516) 663-6601
                                    Phone: (516) 663-6600

                           If to Nortel, to:

                                    Nortel Networks Corporation
                                    8200 Dixie Road, Suite 100
                                    Brampton, Ontario
                                    Canada L6T 5P6
                                    Attention: Corporate Secretary
                                    Fax: (905) 863-8386
                                    Phone: (905) 863-0000


                           With a copy to:

                                    Cleary, Gottlieb, Steen & Hamilton
                                    One Liberty Plaza
                                    New York, New York 10006
                                    Attention: Victor I. Lewkow, Esq.
                                    Fax:  (212) 225-3999
                                    Phone: (212) 225-2370

or to such other  address or  facsimile  number as the Person to whom  notice is
given shall have previously furnished to the others in writing in the manner set
forth above.

     (g) If any term,  provision,  covenant  or  restriction  contained  in this
Agreement  is held  by a court  or a  federal  or  state  regulatory  agency  of
competent  jurisdiction to be invalid,  void or unenforceable,  the remainder of
the terms, provisions and covenants and restrictions contained in this Agreement
shall remain in full force and effect, and shall in no way be affected, impaired
or invalidated.

     (h) Each Stockholder Party acknowledges and agrees that in the event of any
breach of this Agreement, Nortel would be irreparably and immediately harmed and
could not be made whole by monetary damages.  It is accordingly  agreed that (a)
each Stockholder Party will waive, in any action for specific  performance,  the
defense of adequacy of a remedy at law,  and (b) Nortel  shall be  entitled,  in
addition to any other remedy to which it may be entitled at law or in equity, to
compel specific performance of this Agreement.

     (i) All  rights,  powers and  remedies  provided  under this  Agreement  or
otherwise  available in respect  hereof at law or in equity shall be  cumulative
and not  alternative,  and the  exercise  of any  thereof by any party shall not
preclude the  simultaneous  or later exercise of any other such right,  power or
remedy by such  party.  The failure of any party  hereto to exercise  any right,
power or remedy provided under this Agreement or otherwise  available in respect
hereof at law or in equity,  or to insist  upon  compliance  by any other  party
hereto with its obligations hereunder, and any custom or practice of the parties
at variance with the terms hereof,  shall not  constitute a waiver by such party
of its right to exercise any such or other  right,  power or remedy or to demand
such compliance.

     (j) This  Agreement  shall be governed by, and  interpreted  in  accordance
with, the laws of the State of New York.

     (k) The  section  and  paragraph  captions  herein are for  convenience  of
reference only, do not constitute part of this Agreement and shall not be deemed
to limit or otherwise affect any of the provisions hereof.

     (l) This  Agreement  may be executed in one or more  counterparts,  each of
which shall be deemed to constitute an original.

     12. Stockholder Capacity. No Stockholder Party executing this Agreement who
is or becomes  during the term hereof a director or officer of the Company makes
any  agreement  or  understanding  herein in his  capacity  as such  director or
officer.  Each  Stockholder  Party  signs  solely in his  capacity as the record
holder  and/or  beneficial  owner of the Owned  Shares  and Voting  Shares,  and
nothing herein shall limit or affect any actions taken or omitted to be taken by
a Stockholder  Party in his capacity as an officer of director of the Company to
the extent specifically permitted by the Merger Agreement.

     13. Further  Assurances.  From time to time, at Nortel's reasonable request
and without  further  consideration,  each  Stockholder  Party shall execute and
deliver such additional documents and take all such further lawful action as may
be  necessary  or  desirable  to  consummate  and  make  effective,  in the most
expeditious manner practicable, the transactions contemplated by this Agreement.



<PAGE>








     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
duly executed as of the day and year first above written.

                                                   Peter J. Cohen

                                                   /s/
                                                   --------------------------



                                                   George W. Cole

                                                   /s/
                                                   --------------------------



                                                   Richard A. Daniels

                                                   /s/
                                                   --------------------------



                                                   Kevin J. O'Brien

                                                   /s/
                                                   --------------------------



                                                   Jayandra Patel

                                                   /s/
                                                   --------------------------






<PAGE>


                                                   NORTEL NETWORKS CORPORATION

                                               By: /s/
                                                   ----------------------------
                                                   Name:
                                                   Title:


                                               By: /s/
                                                   ----------------------------
                                                   Name:
                                                   Title:







<PAGE>


                                                                     Schedule A


                              STOCKHOLDER PARTIES
<TABLE>
<CAPTION>


NAME                           SHARES                                      ADDRESS
<S>                            <C>                                         <C>
Peter J. Cohen                 Owned Shares: 394,9861                      c/o Periphonics Corporation
                               Other Voting Shares: 0                      4000 Veterans Memorial Highway
                               Total: 394,986                              Bohemia, NY 11756
                                                                           Fax: (516) 467-1755
George W. Cole                 Owned Shares: 345,528                       c/o Periphonics Corporation
                               Other Voting Shares: 0                      4000 Veterans Memorial Highway
                               Total: 345,528                              Bohemia, NY 11756
                                                                           Fax: (516) 467-1755

Richard A. Daniels             Owned Shares: 0                             c/o Periphonics Corporation
                               Other Voting Shares: 399,4982               4000 Veterans Memorial Highway
                               Total: 399,498                              Bohemia, NY 11756
                                                                           Fax: (516) 467-1755

Kevin J. O'Brien               Owned Shares: 230,352                       c/o Periphonics Corporation
                               Other Voting Shares: 0                      4000 Veterans Memorial Highway
                               Total: 230, 352                             Bohemia, NY 11756
                                                                           Fax: (516) 467-1755

Jayandra Patel                 Owned Shares: 421,444                       c/o Periphonics Corporation
                               Other Voting Shares: 0                      4000 Veterans Memorial Highway
                               Total: 421,444                              Bohemia, NY 11756
                                                                           Fax: (516) 467-1755
                               Aggregate Owned Shares: 1,392,310
                               Aggregate Other Voting Shares: 399,498
                               Aggregate Total: 1,791,808




<FN>
- --------
                               1        130,160 shares owned jointly with wife.


                               2        66,500 shares held in grant for brother.
                                        332,998   shares   held  in  grant   for
                                        children.

</FN>
</TABLE>





News Release

www.nortelnetworks.com



 FOR IMMEDIATE RELEASE                                        August 24, 1999


     Nortel Networks to Acquire Periphonics for US$436 Million

     Companies to Unify Internet & Call Centers for New Generation of eServices

     BRAMPTON,  Ontario  and NEW YORK --  Nortel  Networks*  [NYSE/TSE:  NT] and
Periphonics  Corporation  [NASDAQ:  PERI]  announced  today a definitive  merger
agreement  whereby Nortel  Networks will acquire  Periphonics,  a leading global
provider of interactive voice solutions used in call centers and other voice and
data network applications.  Nortel Networks will pay an estimated US$436 million
in its common shares for Periphonics.

     The acquisition will mark another milestone in Nortel Networks' strategy to
deliver a new  generation of networks  that unify voice,  data and the Internet.
Periphonics'  market-leading  self  service  capabilities  will  further  Nortel
Networks'  leadership in unifying call centers with the Internet to create a new
generation of eServices  that  re-define  customer care. "As we come together at
the heart of the  Internet  Revolution,  Nortel  Networks and  Periphonics  will
create new opportunities for commerce and communication," said Wayne Fothergill,
president of Enterprise  Applications  Solutions at Nortel Networks.  "Together,
our solutions  will be even more  attractive to businesses  that want to use the
Internet  and  voice  activation  to  deliver  more  powerful,   versatile,  and
responsive customer care than ever before."

     "Combining  Periphonics' technology with Nortel Networks' full portfolio of
solutions,  global  reach and  Enterprise  applications  leadership  will create
strong value for our customers,  shareholders,  and our  employees,"  said Peter
Cohen, chairman, CEO and president of Periphonics. "By uniting the power of live
customer service  professionals  with the power of the Web, we will create a new
generation of eServices in the call center and beyond."

     Periphonics  has more than 900 highly  skilled  employees in the  Americas,
Europe,  and Asia.  Revenues  for the fiscal  year ended in May 1999 were US$142
million.  The company  designs and  supplies  self-service  voice  response  and
web-enabled  systems for call centers and other network  applications that allow
customers to interact  directly  with a company's  databases  and customer  care
professionals.  This enables  Periphonics'  customers,  which include well-known
global  financial,  telecommunications  and other companies,  to deliver service
faster, more effectively, and more profitably.

     Upon completion of the transaction,  Periphonics will become a wholly owned
subsidiary of Nortel Networks.  Periphonics will continue to be headquartered in
Bohemia,  New York and chairman,  CEO and president Peter Cohen will continue to
lead the business.

     Under  the  terms  of the  agreement,  each  share of  Periphonics  will be
converted into a fraction of a Nortel  Networks share at an exchange ratio equal
to US$29.23  divided by the average  price of a Nortel  Networks  share during a
specified  period prior to closing.  In this  specified  period,  if the average
price of a Nortel Networks share is above  US$47.15,  the exchange ratio will be
fixed at 0.62 and if the average  share price is below  US$38.46,  the  exchange
ratio  will be  fixed at  0.76.  For  example,  based  on the  closing  price of
US$43.625 per share of Nortel  Networks on August 23, 1999,  the exchange  ratio
would be 0.67 and would  result  in Nortel  Networks  issuing  approximately  10
million  common shares for all of the shares of  Periphonics  on a fully diluted
basis.

     The transaction,  which is expected to close in the fourth quarter of 1999,
will be tax-free to Periphonics' United States shareholders.  The transaction is
expected to be slightly  accretive  to Nortel  Networks'  earnings  per share in
calendar year 2000 (excluding acquisition-related charges).

     The boards of directors of both  companies  have approved the  transaction.
Certain  shareholders,  representing  approximately 13.5 percent of Periphonics'
outstanding common shares,  have agreed to vote in favor of the transaction.  In
addition,  Periphonics has agreed to grant Nortel Networks an option to purchase
up to 19.9  percent  of the  outstanding  shares of  Periphonics  under  certain
circumstances.

     The  completion  of the  transaction  is  subject to  customary  regulatory
approvals and the approval of Periphonics' shareholders.

     Credit Suisse First Boston  Technology Group acted as financial  advisor to
Nortel Networks for this  transaction and William Blair and Company  represented
Periphonics.

     Periphonics  Corporation is a global leader in the  development,  marketing
and  support of  products  and  professional  services  for  Computer  Telephony
Integration (CTI) and Telecom Enhanced Network Services.  The Company's products
and services  utilize such  technologies  as Interactive  Voice Response  (IVR),
advanced speech processing with large vocabulary  recognition,  natural language
processing  and  text-to-speech,  as  well  as  interactive  processing  via Web
browsers,  messaging,  and fax. The Company's products and professional services
help its customers  enhance their customer  service  offerings,  increase caller
satisfaction,  reduce  operating  costs and  create new  revenue  opportunities.
Periphonics is an ISO 9001/TickIT  registered  company with systems installed in
more than 50 countries.

     Nortel  Networks  delivers  value to  customers  around  the world  through
Unified   Networks*   solutions,   spanning   mission-critical   telephony   and
IP-optimized  networks.  Customers  include public and private  enterprises  and
institutions; Internet service providers; local, long-distance, cellular and PCS
communications companies, cable television carriers, and utilities.

     Nortel  Networks'  common  shares  are  listed  on the New  York,  Toronto,
Montreal  and London  stock  exchanges.  Nortel  Networks  had 1998  revenues of
US$17.6 billion and has approximately 76,000 employees worldwide.

     Certain  information  included in this press release is forward-looking and
is subject to important risks and uncertainties. The results or events predicted
in these statements may differ materially from actual results or events. Factors
which could cause results or events to differ from current expectations include,
among other  things:  the impact of rapid  technology  change and voice and data
convergence;  price  and  product  competition;  international  growth,  foreign
exchange,  and interest rates; general industry and market conditions and growth
rates;   unanticipated   impact  of  Year  2000   issues;   and  the  impact  of
consolidations in the  telecommunications  industry.  For additional information
with  respect to certain of these and other  factors,  see the reports  filed by
Nortel Networks and Periphonics  Corporation  with the United States  Securities
and  Exchange  Commission,  specifically  the most recent  reports on Form 10-K.
Nortel Networks and Periphonics Corporation disclaim any intention or obligation
to update or revise any forward-looking  statements,  whether as a result of new
information, future events or otherwise.



     * Nortel  Networks,  the  Nortel  Networks  logo,  the  Globemark,  Unified
Networks, and How the world shares ideas are trademarks of Nortel Networks.




For more information:
Jeff Ferry                                              Joseph D. Pititto
Nortel Networks                                         Periphonics Corporation
(703) 712-8339                                          (516) 468-9212
[email protected]                               [email protected]

Or visit Nortel Networks' website at www.nortelnetworks.com  99539 and
Periphonics' website at www.peri.com.



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