AGREEMENT AND PLAN OF MERGER AND REORGANIZATION

                                  BY AND AMONG

                                VTEL CORPORATION,

                                 VTEL-SUB, INC.

                                       AND

                         COMPRESSION LABS, INCORPORATED




                           DATED AS OF JANUARY 6, 1997


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                                TABLE OF CONTENTS

                                                                            Page
ARTICLE I  -- THE MERGER.......................................................2
         Section 1.01.     The Merger..........................................2
         Section 1.02.     The Closing.........................................2
         Section 1.03.     Effective Time......................................2
         Section 1.04.     Effect of the Merger................................2
         Section 1.05.     Certificate of Incorporation........................2
         Section 1.06.     Bylaws..............................................2
         Section 1.07.     Directors and Officers..............................2
         Section 1.08.     Tax Consequences....................................3
         Section 1.09.     Accounting Treatment................................3

ARTICLE II -- CONVERSION OF SECURITIES; EXCHANGE OF CERTIFICATES...............3
         Section 2.01.     Merger Consideration: Conversion and
                              Cancellation of Securities.......................3
         Section 2.02.     Exchange Agency; Surrender of Certificates..........4
         Section 2.03.     Stock Transfer Books................................7
         Section 2.04.     Dissenters' Rights..................................7

ARTICLE III -- REPRESENTATIONS AND WARRANTIES OF THE COMPANY...................8
         Section 3.01.     Organization and Qualification: Subsidiaries........8
         Section 3.02.     Certificate of Incorporation and Bylaws.............9
         Section 3.03.     Capitalization......................................9
         Section 3.04.     Authority..........................................11
         Section 3.05.     No Conflict: Required Filings and Consents.........11
         Section 3.06.     Permits: Compliance................................12
         Section 3.07.     Reports; Financial Statements;
                              Undisclosed Liabilities.........................13
         Section 3.08.     Absence of Certain Changes or Events...............14
         Section 3.09.     Absence of Litigation..............................14
         Section 3.10.     Employee Benefit Plans; Labor Matters..............15
         Section 3.11.     Taxes..............................................16
         Section 3.12.     Affiliates.  ......................................17
         Section 3.13.     Properties.  ......................................18
         Section 3.14.     Intellectual Rights................................18
         Section 3.15.     Real Property. ....................................19
         Section 3.16.     Insider Interests; Transactions with Management....19
         Section 3.17.     Contracts and Agreements...........................20
         Section 3.18.     Vote Required......................................20
         Section 3.19.     Brokers............................................20
         Section 3.20.     Opinion of Financial Advisor.......................20
         Section 3.21.     Board Recommendations.  ...........................20
         Section 3.22.     Distributors, Customers, or Suppliers..............21

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         Section 3.23.     Pooling of Interests...............................21
         Section 3.24.     Rights Plan........................................21
         Section 3.25.     Disclosure.........................................21

ARTICLE IV -- REPRESENTATIONS AND WARRANTIES OF THE VTEL COMPANIES............21
         Section 4.01.     Organization and Qualification; Subsidiaries.......21
         Section 4.02.     Certificate of Incorporation and Bylaws............22
         Section 4.03.     Capitalization.....................................22
         Section 4.04.     Authority..........................................24
         Section 4.05.     No Conflict: Required Filings and Consents.........24
         Section 4.06.     Permits; Compliance................................25
         Section 4.07.     Reports: Financial Statements......................25
         Section 4.08.     Absence of Certain Changes or Events...............26
         Section 4.09.     Absence of Litigation..............................27
         Section 4.10.     Intellectual Rights................................27
         Section 4.11.     Transactions with Management.......................28
         Section 4.12.     Vote Required......................................28
         Section 4.13.     Brokers............................................28
         Section 4.14.     Opinion of Financial Advisor.......................29
         Section 4.15.     Board Recommendations..............................29
         Section 4.16.     Distributors, Customers, or Suppliers..............29
         Section 4.17.     Pooling of Interests...............................29
         Section 4.18.     Disclosure.........................................29

ARTICLE V -- COVENANTS........................................................29
         Section 5.01.     Affirmative Covenants of the Company...............29
         Section 5.02.     Affirmative Covenants of VTEL......................30
         Section 5.03.     Negative Covenants of the Company.  ...............31
         Section 5.04.     Negative Covenants of VTEL.........................35
         Section 5.05.     Access and Information.............................36

ARTICLE VI -- ADDITIONAL AGREEMENTS...........................................37
         Section 6.01.     Presentation to Stockholders.......................37
         Section 6.02.     Registration Statement; Proxy Statement/Prospectus.38
         Section 6.03.     Appropriate Action: Consents; Filings..............39
         Section 6.04.     Affiliates; Tax Treatment..........................40
         Section 6.05.     Public Announcements...............................41
         Section 6.06.     NASDAQ Listing.....................................41
         Section 6.07.     State Takeover Statutes............................41
         Section 6.08.     Charter Amendment..................................42
         Section 6.09.     Board Seats........................................42
         Section 6.10.     Options............................................42
         Section 6.11.     Series C Preferred Stock Warrants. ................43

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         Section 6.12.     Termination of Convertible Preferred
                              Stock Purchase Agreement........................43
         Section 6.13.     Merger Sub.........................................43
         Section 6.14.     Indemnification....................................43
         Section 6.15.     Employment Contracts...............................45
         Section 6.16.     Comfort Letters....................................46
         Section 6.17.     Sales Under Rule 145 if Applicable.................46

ARTICLE VII -- CLOSING CONDITIONS.............................................47
         Section 7.01.     Conditions to Obligations of Each Party
                              Under This Agreement............................47
         Section 7.02.     Additional Conditions to Obligations
                              of the VTEL Companies...........................48
         Section 7.03.     Additional Conditions to Obligations
                              of the Company..................................49

ARTICLE VIII -- TERMINATION, AMENDMENT AND WAIVER.............................50
         Section 8.01.     Termination........................................50
         Section 8.02.     Effect of Termination.  ...........................52
         Section 8.03.     Amendment..........................................53
         Section 8.04.     Waiver.  ..........................................53
         Section 8.05.     Fees, Expenses and Other Payments..................53

ARTICLE IX -- GENERAL PROVISIONS..............................................54
         Section 9.01.     Effectiveness of Representations,
                              Warranties and Agreements.......................54
         Section 9.02.     Notices............................................55
         Section 9.03.     Certain Definitions................................56
         Section 9.04.     Headings...........................................57
         Section 9.05.     Severability.......................................57
         Section 9.06.     Entire Agreement...................................57
         Section 9.07.     Assignment.........................................57
         Section 9.08.     Parties in Interest................................57
         Section 9.09.     Failure or Indulgence Not Waiver;
                              Remedies Cumulative.............................58
         Section 9.10.     Governing Law......................................58
         Section 9.11.     Counterparts.......................................58
         Section 9.12.     Specific Performance...............................58


EXHIBIT A         -        Stock Option Agreement
EXHIBIT B         -        Company Affiliate Letter
EXHIBIT C         -        Acquiror Affiliate Letter



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                 AGREEMENT AND PLAN OF MERGER AND REORGANIZATION


         THIS  AGREEMENT  AND PLAN OF  MERGER  AND  REORGANIZATION,  dated as of
January 6, 1997 (this "Agreement"), is by and among VTEL CORPORATION, a Delaware
corporation ("VTEL"),  VTEL-SUB,  INC., a Delaware corporation and direct wholly
owned subsidiary of VTEL ("Merger Sub"), and COMPRESSION LABS,  INCORPORATED,  a
Delaware  corporation  (the  "Company").  VTEL  and  Merger  Sub  are  sometimes
collectively referred to herein as the "VTEL Companies."

         WHEREAS,  Merger Sub,  upon the terms and subject to the  conditions of
this Agreement and in accordance  with the General  Corporation Law of the State
of Delaware ("DGCL"), will merge with and into the Company (the "Merger");

         WHEREAS,  the Board of Directors of the Company has determined that the
Merger is advisable  and is fair to, and in the best  interests  of, the Company
and  its  stockholders,   has  approved  and  adopted  this  Agreement  and  the
transactions  contemplated  hereby, and has recommended approval and adoption of
this Agreement by the stockholders of the Company;

         WHEREAS,  the Board of Directors of VTEL has determined that the Merger
is  advisable  and is fair  to,  and in the  best  interests  of,  VTEL  and its
stockholders,  has  approved  and adopted this  Agreement  and the  transactions
contemplated hereby, and its sole stockholder,  VTEL, has approved the Merger by
unanimous written consent;

         WHEREAS,  the Board of Directors of Merger Sub has approved and adopted
this Agreement and the  transactions  contemplated  hereby,  and has recommended
approval and adoption of this Agreement by its stockholder;

         WHEREAS,  it is the intent of the respective Boards of Directors of the
Company  and VTEL  that the  Merger be  structured  as a  strategic  combination
involving a "merger of equals" of the  Company  and VTEL and that the  Surviving
Corporation (as defined herein) be governed and operated on that basis;

         WHEREAS,  for federal  income tax  purposes,  it is  intended  that the
Merger will qualify as a  reorganization  under the provisions of Section 368(a)
of the United States Internal Revenue Code of 1986, as amended (the "Code");

         WHEREAS, the parties intend to cause the Merger to be accounted for as
a pooling of interests pursuant to APB Opinion No. 16, Staff Accounting Series
Release 130, 135 and 146 and Staff Accounting Bulletins Topic Two;

         WHEREAS,  in furtherance of, and as a requirement of the VTEL Companies
to enter into this  Agreement  providing  for, the Merger,  the Company and VTEL
have entered into a Stock

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Option Agreement, dated of even date herewith, in the form attached as Exhibit A
(the "Stock Option Agreement"); and

         NOW,  THEREFORE,  in  consideration of the foregoing and the respective
representations,   warranties,  covenants  and  agreements  set  forth  in  this
Agreement, the parties hereto agree as follows:

                                    ARTICLE I
                                   THE MERGER

         Section 1.01. The Merger.  Upon the terms and subject to the conditions
set forth in this  Agreement,  and in accordance with the DGCL, at the Effective
Time (as defined in Section 1.03 of this Agreement),  Merger Sub shall be merged
with and into the Company.  As a result of the Merger,  the  separate  corporate
existence  of Merger  Sub shall  cease and the  Company  shall  continue  as the
surviving corporation of the Merger (the "Surviving  Corporation").  The name of
the  Surviving  Corporation  shall  continue  after  the  Effective  Time  to be
"Compression Labs, Incorporated."

         Section 1.02. The Closing.  Subject to the terms and conditions of this
Agreement, the closing of the Merger (the "Closing") shall take place (a) at the
offices of Jenkens & Gilchrist,  a Professional  Corporation,  1445 Ross Avenue,
Suite 3200,  Dallas,  Texas  75202-2799,  at 9:00 am., local time, on the second
business day immediately  following the day on which the last to be fulfilled or
waived of the  conditions  set forth in Article VII shall be fulfilled or waived
in  accordance  herewith  (other  than  conditions  with  respect to actions the
respective parties hereto will take at the Closing),  or (b) at such other time,
date or place as VTEL and the Company  may agree.  The date on which the Closing
occurs is hereinafter referred to as the "Closing Date."

         Section  1.03.  Effective  Time. As promptly as  practicable  after the
satisfaction  or, if permissible,  waiver of the conditions set forth in Article
VII of  this  Agreement,  the  parties  hereto  shall  cause  the  Merger  to be
consummated by filing a Certificate of Merger with the Secretary of State of the
State of Delaware,  in such form as is required  by, and executed in  accordance
with the relevant  provisions  of, the DGCL (the date and time of the completion
of such filing being the "Effective Time").

         Section 1.04.  Effect of the Merger.  At the Effective Time, the effect
of the Merger shall be as provided in Section 259 of 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 Merger Sub and the
Company shall vest in the  Surviving  Corporation,  and all debts,  obligations,
liabilities  and duties of each of Merger Sub and the Company  shall  become the
debts, obligations, liabilities and duties of the Surviving Corporation.


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         Section 1.05.     Certificate of Incorporation.  At the Effective Time,
the Certificate of Incorporation of the Company shall be the Certificate of
Incorporation of Merger Sub as in effect immediately prior to the Effective
Time.

         Section 1.06.     Bylaws.  At the Effective Time and without further
action on the part of the Company or VTEL, the Bylaws of the Surviving
Corporation shall be the Bylaws of Merger Sub in effect as of the Effective
Time.

         Section  1.07.  Directors  and  Officers.  The  directors of Merger Sub
immediately  prior to the Effective Time shall be the directors of the Surviving
Corporation,  each  to  hold  office  in  accordance  with  the  Certificate  of
Incorporation and Bylaws of the Surviving  Corporation,  and the officers of the
Company  immediately  prior to the  Effective  Time shall be the officers of the
Surviving  Corporation,  in each case until their respective successors are duly
elected or appointed and qualified.

         Section 1.08.  Tax  Consequences.  It is intended that the Merger shall
constitute a  reorganization  within the meaning of Section  368(a) of the Code,
and that this  Agreement  shall  constitute a "plan of  reorganization"  for the
purposes of Section 368 of the Code.

         Section 1.09.     Accounting Treatment.  It is intended that the Merger
shall be treated as a pooling-of-interests for accounting purposes by VTEL and
the Company.


                                   ARTICLE II
               CONVERSION OF SECURITIES; EXCHANGE OF CERTIFICATES

         Section 2.01.     Merger Consideration: Conversion and Cancellation of
Securities.  At the Effective Time, by virtue of the Merger and without any
action on the part of the VTEL Companies, the Company or the holders of any of
the Company's securities:

                  (a) Subject to the other  provisions  of this Article II, each
         share of common  stock,  par  value  $.001 per  share,  of the  Company
         ("Company  Common Stock") issued and outstanding  immediately  prior to
         the Effective Time  (excluding  any Company  Common Stock  described in
         Section 2.01(e) of this Agreement) shall be converted into the right to
         receive .46 of one fully paid and nonassessable  share of common stock,
         par value $.0l per share,  of VTEL ("VTEL  Common  Stock") (the "Common
         Stock Conversion Ratio").

                  (b) Subject to the other  provisions  of this Article II, each
         share of Series C Preferred  Stock,  par value $.001 per share,  of the
         Company ("Series C Preferred Stock") issued and outstanding immediately
         prior to the Effective  Time  (excluding  any Series C Preferred  Stock
         described  in Section  2.01(e)  of this  Agreement  and any  Dissenting
         Shares, as herein defined) shall be converted into the right to receive
         3.15 fully paid and

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         nonassessable share of VTEL Common Stock (the "Series C Preferred Stock
         Conversion Ratio").

                  (c) Notwithstanding the foregoing, if between the date of this
         Agreement and the Effective Time the outstanding  shares of VTEL Common
         Stock or Company  Common Stock shall have been changed into a different
         number of shares or a different class, by reason of any stock dividend,
         subdivision, reclassification,  recapitalization, split, combination or
         exchange of shares,  the Common Stock Conversion Ratio and the Series C
         Preferred Stock Conversion Ratio shall be  correspondingly  adjusted to
         reflect   such   stock   dividend,    subdivision,    reclassification,
         recapitalization, split, combination or exchange of shares.

                  (d) As a  result  of  their  conversion  pursuant  to  Section
         2.01(a) and Section  2.01(b),  all shares of Company  Common  Stock and
         Series C  Preferred  Stock  shall  cease to be  outstanding  and  shall
         automatically  be canceled and  retired.  Each  certificate  previously
         evidencing  Company Common Stock  outstanding  immediately prior to the
         Effective  Time (other than Company  Common Stock  described in Section
         2.01(e) of this Agreement) ("Converted Common Shares") shall thereafter
         represent,  subject to Section 2.02(d) of this Agreement,  the right to
         receive  that  number of shares of VTEL  Common  Stock  into  which the
         shares of Company  Common Stock  represented by such  certificate  have
         been  converted  pursuant  to  subsection  (a)  of  this  Section  2.01
         determined  pursuant  to the Common  Stock  Conversion  Ratio  and,  if
         applicable,  the right to receive cash  pursuant to Section  2.02(d) of
         this Agreement ("Common Stock Merger Consideration").  Each certificate
         previously evidencing Series C Preferred Stock outstanding  immediately
         prior to the  Effective  Time  (other  than  Series C  Preferred  Stock
         described  in Section  2.01(e)  of this  Agreement  and any  Dissenting
         Shares) (the "Converted  Series C Preferred  Shares" and, together with
         the Converted Common Shares,  the "Converted  Shares") shall thereafter
         represent,  subject to Section 2.02(d) of this Agreement,  the right to
         receive  that  number of shares of VTEL  Common  Stock  into  which the
         shares of Series C Preferred Stock represented by such certificate have
         been  converted  pursuant  to  subsection  (b)  of  this  Section  2.01
         determined  pursuant to the Series C Preferred Stock  Conversion  Ratio
         and,  if  applicable,  the right to receive  cash  pursuant  to Section
         2.02(d) of this Agreement (the "Series C Preferred Stock Consideration"
         and, with the Common Stock Consideration,  the "Merger Consideration").
         The holders of  certificates  previously  evidencing  Converted  Shares
         shall cease to have any rights with  respect to such  Converted  Shares
         except the right to receive the Merger Consideration applicable thereto
         and  as  otherwise   provided  herein  or  by  law.  Such  certificates
         previously   evidencing   Converted   Shares  shall  be  exchanged  for
         certificates  evidencing  whole  shares of VTEL Common  Stock issued in
         consideration  therefor  upon the  surrender  of such  certificates  in
         accordance  with the provisions of Section 2.02 of this  Agreement.  No
         fractional  shares of VTEL  Common  Stock  shall be issued and, in lieu
         thereof,  a cash payment shall be made  pursuant to Section  2.02(d) of
         this Agreement.


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                  (e)  Notwithstanding  any  provision of this  Agreement to the
         contrary,  each share of  Company  Common  Stock or Series C  Preferred
         Stock held in the  treasury  of the  Company  and each share of Company
         Common  Stock  owned by VTEL or any  direct or  indirect  wholly  owned
         subsidiary of VTEL or of the Company immediately prior to the Effective
         Time shall be canceled and extinguished  without any conversion thereof
         and no payment shall be made with respect thereto.

                  (f) Each share of common stock,  par value $.0l per share,  of
         Merger Sub issued and  outstanding  immediately  prior to the Effective
         Time shall be converted  into and  exchanged  for one newly and validly
         issued,  fully  paid and  nonassessable  share of  common  stock of the
         Surviving Corporation.

         Section 2.02.     Exchange Agency; Surrender of Certificates.

                  (a) Exchange  Fund.  At or prior to the Effective  Time,  VTEL
         shall deposit,  or cause to be deposited,  with a bank or trust company
         designated  by VTEL (the  "Exchange  Agent"),  for the  benefit  of the
         holders of  Converted  Shares,  for  exchange in  accordance  with this
         Article II,  through the Exchange Agent (i)  certificates  evidencing a
         number of shares  of VTEL  Common  Stock  equal to the  product  of the
         Common Stock  Conversion  Ratio  multiplied  by the number of Converted
         Common Shares issued and outstanding immediately prior to the Effective
         Time,  (ii)  certificates  evidencing a number of shares of VTEL Common
         Stock equal to the product of the Series C Preferred  Stock  Conversion
         Ratio  multiplied  by the number of shares of Series C Preferred  Stock
         issued and  outstanding  immediately  prior to the Effective  Time, and
         (iii) cash in an amount  sufficient  to provide for the  payments to be
         made in lieu of issuing any  fractional  shares of VTEL Common Stock as
         provided in Section 2.02(d) of this Agreement. Additionally, subject to
         the provisions of subsection (e) of this Section 2.02,  VTEL shall,  if
         and when a payment  date has  occurred  with  respect to a dividend  or
         distribution  that has been declared  subsequent to the Effective Time,
         deposit with the Exchange  Agent an amount in cash (or property of like
         kind to that which is the  subject of such  dividend  or  distribution)
         equal to the  dividend or  distribution  per share of VTEL Common Stock
         times  the  number  of  shares  of  VTEL  Common  Stock   evidenced  by
         certificates  theretofore  representing  Converted Shares that have not
         theretofore  been  surrendered  for  exchange in  accordance  with this
         Section  2.02.  The  certificates  and  cash  (and  property,  if  any)
         deposited  with the  Exchange  Agent in  accordance  with this  Section
         2.02(a)  are  hereinafter  referred  to as  the  "Exchange  Fund."  The
         Exchange  Agent shall,  pursuant to irrevocable  instructions,  deliver
         VTEL Common Stock (and any dividends or distribution  related  thereto)
         and/or  cash,  as  described   above,   in  exchange  for   surrendered
         certificates  pursuant  to  the  terms  of  this  Agreement  out of the
         Exchange Fund.

                  (b)      Exchange Procedures.  As soon as practicable after
         the Effective Time, VTEL shall cause the Exchange Agent to send to each
         record holder of Company Common Stock and Series C Preferred Stock at
         the Effective Time (i) a letter of transmittal (which

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         shall  specify that  delivery  shall be effected,  and risk of loss and
         title to the certificates theretofore representing Company Common Stock
         or Series C Preferred Stock (the "Certificates")  shall pass, only upon
         delivery of the Certificates to the Exchange Agent and shall be in such
         form and contain such other  provisions  as VTEL and the Company  shall
         reasonably  determine),  and (ii) instructions for use in effecting the
         surrender of the Certificates in exchange for certificates representing
         shares of VTEL Common Stock and any cash in lieu of fractional  shares,
         into  which the shares of Company  Common  Stock or Series C  Preferred
         Stock  represented by such Certificate or Certificates  shall have been
         converted  pursuant to this Agreement.  Upon surrender of a Certificate
         for  cancellation to the Exchange  Agent,  together with such letter of
         transmittal,  duly executed,  the holder of such  Certificate  shall be
         entitled to receive in exchange  therefor,  a certificate  representing
         that number of whole  shares of VTEL Common Stock which such holder has
         the right to receive  pursuant to the provisions of this Article II and
         cash in the amount  such  holder has the right to receive  pursuant  to
         such provisions,  and the Certificate so surrendered shall forthwith be
         canceled.  In the event of a transfer of  ownership  of Company  Common
         Stock or  Series C  Preferred  Stock  which  is not  registered  in the
         transfer  records of the Company,  a certificate  evidencing the proper
         number of shares of VTEL Common  Stock may be issued to the  transferee
         if the  Certificate  evidencing  the Company  Common  Stock or Series C
         Preferred Stock shall be surrendered to the Exchange Agent, accompanied
         by all  documents  required to evidence and effect such transfer and by
         evidence that any applicable stock transfer taxes have been paid. Until
         surrendered  for exchange in accordance  with the provisions of Section
         2.02 of  this  Agreement,  each  Certificate  theretofore  representing
         Converted  Shares (other than shares of Company Common Stock and Series
         C Preferred  Stock to be canceled  pursuant to Section  2.01(e) of this
         Agreement and any Dissenting Shares) shall from and after the Effective
         Time  represent  for  all  purposes  only  the  right  to  receive  the
         applicable Merger Consideration as set forth in this Agreement.  If any
         holder of Converted  Shares shall be unable to surrender  such holder's
         Certificates  because such  Certificates  have been lost or  destroyed,
         such holder may deliver in lieu thereof an affidavit and indemnity bond
         in form and substance and with surety reasonably  satisfactory to VTEL.
         No interest shall be paid on any Merger Consideration payable to former
         holders of Converted Shares.

                  (c)  Distributions  with  Respect  to VTEL  Common  Stock.  No
         dividends or other  distributions  declared or made after the Effective
         Time with  respect to VTEL  Common  Stock with a record  date after the
         Effective  Time  shall  be  paid  to the  holder  of any  unsurrendered
         Certificate theretofore  representing shares of Company Common Stock or
         Series C  Preferred  Stock with  respect  to any shares of VTEL  Common
         Stock evidenced thereby,  and no Merger  Consideration shall be paid to
         any such holders until the holder of such  Certificate  shall surrender
         such  Certificate  theretofore  representing  shares of Company  Common
         Stock or shares of Series C  Preferred  Stock . Subject  to  applicable
         laws, following surrender of any such Certificate,  there shall be paid
         to the  holder  of the  certificates  evidencing  whole  shares of VTEL
         Common  Stock  issued  in  exchange  therefor,  without  interest,  (i)
         promptly following the surrender of such Certificate and in addition

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         to the amount of any cash payable with respect to a fractional share of
         VTEL Common Stock to which such holder is entitled  pursuant to Section
         2.02(d)  of  this   Agreement,   the  amount  of   dividends  or  other
         distributions  with a record date after the Effective Time  theretofore
         paid with respect to such whole shares of VTEL Common Stock and (ii) at
         the  appropriate  payment  date,  the  amount  of  dividends  or  other
         distributions  with a record date after the Effective Time but prior to
         surrender and a payment date  occurring  after  surrender  payable with
         respect to such whole shares of VTEL Common Stock.

                  (d) No Fractional  Shares. No certificates or scrip evidencing
         fractional  shares  of VTEL  Common  Stock  shall  be  issued  upon the
         surrender  for  exchange of  Certificates,  and such  fractional  share
         interests  shall not  entitle  the  owner  thereof  to any  rights of a
         stockholder of VTEL. In lieu of any such  fractional  shares,  (i) each
         holder of a Certificate  previously  evidencing Company Common Stock or
         Series C  Preferred  Stock,  upon  surrender  of such  Certificate  for
         exchange  pursuant to this  Article II, shall be paid an amount in cash
         (without  interest),   rounded  to  the  nearest  cent,  determined  by
         multiplying  (A)  the  Average  Closing  Price  by (B)  the  fractional
         interest to which such holder would otherwise be entitled (after taking
         into  account all shares of Company  Common Stock or Series C Preferred
         Stock held of record by such holder at the  Effective  Time).  "Average
         Closing Price" means the average closing sales price of the VTEL Common
         Stock on The NASDAQ  Stock  Market (or such other  quotation  system or
         securities  exchange on which the VTEL  Common  Stock is then quoted or
         listed) as reported by the Wall Street  Journal for the 20  consecutive
         trading days  beginning 22 trading days prior to the scheduled  Closing
         Date as provided in Section 1.02 hereof.

                  (e)  Termination of Exchange Fund. Any portion of the Exchange
         Fund that remains  unclaimed by the former holders of Converted  Shares
         on the first  anniversary  of the Closing  Date shall be  delivered  to
         VTEL, upon demand,  and any former holders of Converted Shares who have
         not  theretofore  complied with this Article II shall  thereafter  look
         only  to  VTEL  for  the  Merger   Consideration   and   dividends   or
         distributions to which they are entitled, without any interest thereon.
         Neither  VTEL nor the Company  shall be liable to any former  holder of
         Converted  Shares  for  any  Merger   Consideration  (or  dividends  or
         distributions  with  respect  thereto)  or cash  delivered  to a public
         official  pursuant to any  applicable  abandoned  property,  escheat or
         similar law.

                  (f)  Withholding.  VTEL (or any  affiliate  thereof)  shall be
         entitled  to  deduct  and  withhold  from the  consideration  otherwise
         payable  pursuant to this  Agreement to any former  holder of Converted
         Shares such amounts as VTEL (or any  affiliate  thereof) is required to
         deduct and withhold  with  respect to the making of such payment  under
         the Code or any other provision of federal, state, local or foreign tax
         law and VTEL  agrees  to  remit to the  proper  taxing  authority  such
         amounts so  withheld.  To the extent  that  amounts  are so withheld by
         VTEL,  such withheld  amounts shall be treated for all purposes of this
         Agreement  as having  been paid to the former  holder of the  Converted
         Shares in respect of which such deduction and  withholding  was made by
         VTEL.

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<PAGE>




         Section 2.03.  Stock Transfer  Books.  At the Effective Time, the stock
transfer  books of the  Company  shall be closed  and there  shall be no further
registration  of  transfers  of  shares  of  Company  Common  Stock or  Series C
Preferred  thereafter  on the records of the Company.  If,  after the  Effective
Time,  Certificates  are presented to the Surviving  Corporation,  they shall be
canceled and  exchanged  for the Merger  Consideration,  deliverable  in respect
thereof  pursuant to this Agreement in accordance  with the procedures set forth
in  this  Article  II.  Certificates  surrendered  for  exchange  by any  person
constituting an "affiliate" of the Company for purposes of Rule 145(c) under the
Securities  Act of  1933,  as  amended  (the  "Securities  Act"),  shall  not be
exchanged  until  VTEL has  received  a written  agreement  from such  person as
provided in Section 6.04.

         Section 2.04.     Dissenters' Rights.

                  (a) The holders of shares of Company Common Stock shall not be
         entitled  to  appraisal  rights.   Notwithstanding   anything  in  this
         Agreement  to the  contrary,  each  share of Series C  Preferred  Stock
         issued and outstanding immediately prior to the Effective Time and held
         by  stockholders  who have not voted such shares in favor of the Merger
         or  consented  thereto in writing and qualify  under and have  complied
         with all of the  provisions  of  Section  262 of the DGCL  ("Dissenting
         Shares")  shall not, by virtue of the  Merger,  be  converted  into the
         right to receive the Series C Preferred  Stock  Consideration  but such
         stockholder shall be entitled to receive payment of the appraised value
         of such shares of Series C Preferred  Stock held by them in  accordance
         with the provisions of Section 262 of the DGCL; provided, however, that
         if any holder of Dissenting Shares (i) subsequently  delivers a written
         withdrawal of his demand for appraisal rights (with the written consent
         of VTEL if such written withdrawal is not made within 60 days after the
         Effective  Time),  or (ii)  fails  to  perfect  dissenter's  rights  as
         provided in Section 262 of the DGCL,  or (iii) if neither any holder of
         Dissenting  Shares nor the Surviving  Corporation  has filed a petition
         demanding a determination of the value of Dissenting  Shares within the
         time provided in Section 262 of the DGCL, the Dissenting Shares held by
         such holder or holders (as the case may be) shall  thereupon  be deemed
         to have been converted into and to have become  exchangeable for, as of
         the Effective  Time, the right to receive the Series C Preferred  Stock
         Consideration,  as provided  in this  Agreement  without  any  interest
         thereon.

                  (b) The  Company  shall  give  VTEL (i)  prompt  notice of any
         written demands for appraisal,  withdrawal of demands for appraisal and
         any other  instruments  served  pursuant to Section 262 of the DGCL and
         (ii) the opportunity to direct all  negotiations  and proceedings  with
         respect to demands for  appraisal  under  Section 262 of the DGCL.  The
         Company agrees that prior to the Effective  Time, it will not,  without
         the prior written  consent of VTEL,  voluntarily  make or agree to make
         any payment  with  respect  to, or settle or offer to settle,  any such
         demands.


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                                                         8

<PAGE>



                  (c) Each holder of  Dissenting  Shares who  becomes  entitled,
         pursuant to the  provisions  of Section 262 of the DGCL,  to payment of
         his or its Dissenting  Shares shall receive payment  therefor after the
         Effective  Time from the  Surviving  Corporation  (but  only  after the
         amount  thereof  shall  have been  agreed  upon or  finally  determined
         pursuant to such provisions) and such shares shall be canceled.

                                   ARTICLE III
                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

         The Company hereby represents and warrants to the VTEL Companies that:

         Section 3.01. Organization and Qualification: Subsidiaries. The Company
is a  corporation,  and each of the  Company's  subsidiaries  (as  such  term in
defined in Section 9.03 herein) is a corporation or partnership, duly organized,
validly  existing and in good standing under the laws of the jurisdiction of its
incorporation or organization,  and each of the Company and its subsidiaries has
all requisite  power and authority to own,  lease and operate its properties and
to conduct its  business as it is now being  conducted  and is  qualified  to do
business and is in good standing in each jurisdiction in which the nature of the
business  conducted by it or the  ownership or leasing of its  properties  makes
such  qualification  necessary,  other than where the failure to be so qualified
and in good standing could not reasonably be expected to have a Company Material
Adverse  Effect.  The term  "Company  Material  Adverse  Effect" as used in this
Agreement  shall mean any change or effect that would be  materially  adverse to
the financial condition,  results of operations,  business,  or prospects of the
Company and its  subsidiaries,  taken as a whole,  at the time of such change or
effect; provided, however, no Company Material Adverse Effect shall be deemed to
have occurred hereunder (i) as a result of customers of the Company deferring or
delaying  orders  as a  result  of the  announcement  of the  execution  of this
Agreement,  (ii) if the  financial  condition  or results of  operations  of the
Company's  business  are not  materially  and  adversely  different  from  those
announced  with respect to the Company's  quarter  ended  September 30, 1996, or
(iii) as a result of the Company  employee  departures after the announcement of
the  execution  of  this  Agreement.  Section  3.01 of the  Disclosure  Schedule
delivered by the Company to the VTEL Companies  concurrently  with the execution
of this Agreement (the "Company Disclosure Schedule") sets forth, as of the date
of this  Agreement,  a true and complete list of all the  Company's  directly or
indirectly   owned   subsidiaries,   together  with  (a)  the   jurisdiction  of
incorporation or organization of each such subsidiary and the percentage of each
such subsidiary's  outstanding  capital stock or other equity interests owned by
the  Company or another  subsidiary  of the  Company  and (b) an  indication  of
whether each such subsidiary is a "Significant Subsidiary" as defined in Section
9.03 of this Agreement.

         Section 3.02.     Certificate of Incorporation and Bylaws.  The Company
has  heretofore  furnished or made available to VTEL complete and correct copies
of  the  Certificate  of   Incorporation   and  the  Bylaws  or  the  equivalent
organizational  documents,  in each  case as  amended  or  restated  to the date
hereof, of the Company and each of its Significant Subsidiaries. Neither

CORPDAL:59869.4 22768-00022
                                                         9

<PAGE>



the Company nor any of its subsidiaries is in violation of any of the provisions
of its  Certificate of  Incorporation  or Bylaws (or  equivalent  organizational
documents).

         Section 3.03.     Capitalization.

                  (a) The  authorized  capital stock of the Company  consists of
         25,153,658  shares of Company Common Stock,  par value $.001 per share,
         and 4,000,000  shares of preferred stock, par value $.001 per share. At
         the date hereof,  15,865,178 shares of Company Common Stock were issued
         and  outstanding,  no shares of Company  Common  Stock were held by the
         Company in its treasury or by the Company's  subsidiaries and 8,635,185
         shares of Company  Common Stock were  reserved for issuance as follows:
         (i) 2,589,866  shares were reserved for issuance upon exercise of stock
         options  heretofore  granted or  available  for grant  pursuant  to the
         Company's 1980 Stock Option Plan;  (ii) 2,506,833  shares were reserved
         for  issuance  upon  exercise of stock  options  heretofore  granted or
         available for grant pursuant to the Company's 1984  Supplemental  Stock
         Option Plan;  (iii) 176,244  shares were reserved for issuance upon the
         purchase of shares under the  Company's  1984 Employee  Stock  Purchase
         Plan;  (iv) 168,000  shares were reserved for issuance upon exercise of
         stock options heretofore granted or available for grant pursuant to the
         Company's  1992  Non-Employee  Directors'  Stock Option Plan (the plans
         referred to in clauses (i) through  (iv) of this  section  being herein
         collectively  called the "Company  Option  Plans");  (v) 580,000 shares
         were  reserved  for issuance  upon the  exercise of the  warrants  (the
         "Common Stock Warrants") listed and described in Section 3.03(a) of the
         Company  Disclosure  Schedule;  (vi) 2,424,242 shares were reserved for
         issuance upon conversion of the Company's Series C Preferred Stock; and
         (vii) 3,120,500  shares were reserved for issuance upon exercise of the
         Stock Option Agreement.  At the date hereof, 350,000 shares of Series C
         Preferred  Stock  were  issued  and  outstanding,  no other  shares  of
         preferred stock was issued and outstanding,  and no shares of preferred
         stock were held by the  Company  in its  treasury  or by the  Company's
         subsidiaries.  Except as  described  in this Section 3.03 or in Section
         3.03(a) of the Company Disclosure Schedule,  no shares of capital stock
         of the Company are issued and  outstanding or reserved for issuance for
         any other  purpose.  Each of the issued shares of capital stock of each
         of the Company and its subsidiaries is duly authorized,  validly issued
         and fully paid and nonassessable,  and has not been issued in violation
         of (nor are any of the authorized  shares of capital stock of, or other
         equity interests in, the Company or any of its subsidiaries subject to)
         any preemptive or similar rights created by statute, the Certificate of
         Incorporation or Bylaws (or the equivalent organizational documents) of
         the Company or any of its  subsidiaries,  or any agreement to which the
         Company or any of its  subsidiaries  is a party or is bound.  Except as
         set forth in Section 3.03(a) of the Company  Disclosure  Schedule,  all
         issued  shares or other  equity  interests in the  subsidiaries  of the
         Company  owned by the Company or a subsidiary  of the Company are owned
         free and  clear of all  security  interests,  liens,  claims,  pledges,
         agreements,  limitations on the Company's or such subsidiaries'  voting
         rights, charges or other encumbrances of any nature whatsoever.


CORPDAL:59869.4 22768-00022
                                                        10

<PAGE>



                  (b) No bonds,  debentures,  notes or other indebtedness of the
         Company or its  subsidiaries  having the right to vote (or  convertible
         into or exchangeable or exercisable for securities  having the right to
         vote) on any matters on which  stockholders  may vote ("Company  Voting
         Debt") are issued or  outstanding.  All shares of Company  Common Stock
         which may be issued upon exercise of stock options granted  pursuant to
         the Company  Option  Plans or Common  Stock  Warrants and all shares of
         Company Common Stock which may be issued upon  conversion of the Series
         C Preferred  Stock will,  when issued in  accordance  with the terms of
         such stock  options,  warrants,  designations  and the related  Company
         Option Plans, be validly issued,  fully paid and  nonassessable and not
         subject to preemptive rights.

                  (c) Except as set forth in Section 3.03(a) above or in Section
         3.03(c)  of the  Company  Disclosure  Schedule,  there are no  options,
         warrants or other rights (including  registration rights),  agreements,
         arrangements  or  commitments  of any character to which the Company or
         any of its  subsidiaries  is a party relating to the issued or unissued
         capital stock of the Company or any of its  subsidiaries  or obligating
         the  Company  or any of its  subsidiaries  to grant,  issue or sell any
         shares of capital stock,  Company Voting Debt or other equity interests
         of the  Company  or any of its  subsidiaries.  Except  as set  forth in
         Section  3.03(c)  of the  Company  Disclosure  Schedule,  there  are no
         obligations,  contingent  or  otherwise,  of the  Company or any of its
         subsidiaries (i) to repurchase,  redeem or otherwise acquire any shares
         of Company  Common Stock or other  capital  stock of the Company or the
         capital  stock of any  subsidiary  of the  Company  or (ii)  other than
         advances  to  wholly  owned  subsidiaries  in the  ordinary  course  of
         business,  to provide  funds to, or to make any  investment  in (in the
         form of a loan, capital  contribution or otherwise),  or to provide any
         guarantee  with respect to the  obligations  of, any  subsidiary of the
         Company or any other person. Except (i) as set forth in Section 3.03(c)
         of the Company Disclosure  Schedule or (ii) for the subsidiaries of the
         Company set forth in Section 3.01 of the Company  Disclosure  Schedule,
         neither  the  Company  nor  any of its  subsidiaries  (x)  directly  or
         indirectly owns, (y) has agreed to purchase or otherwise acquire or (z)
         holds any interest  convertible into or exchangeable or exercisable for
         the capital stock or other equity interests  representing  five percent
         (5%) or more of the  capital  stock or other  equity  interests  of any
         corporation,  partnership,  joint venture or other business association
         or  entity.  Except  as set forth in  Section  3.03(c)  of the  Company
         Disclosure Schedule or for any agreements,  arrangements or commitments
         between the Company and its wholly owned  subsidiaries  or between such
         wholly owned  subsidiaries,  there are no agreements,  arrangements  or
         commitments  of any character  (contingent  or  otherwise)  pursuant to
         which any person is or may be entitled to receive any payment based on,
         or  calculated  in  accordance  with,  the  revenues or earnings of the
         Company  or any of its  subsidiaries.  Except as set  forth in  Section
         3.03(c) of the Company Disclosure Schedule, there are no voting trusts,
         proxies or other agreements or  understandings  to which the Company or
         any of its  subsidiaries  is a party or by which the  Company or any of
         its  subsidiaries  is bound with respect to the voting of any shares of
         capital  stock or other  equity  interests of the Company or any of its
         subsidiaries.

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                                                        11

<PAGE>




                  (d) Section  3.03(d) of the Company  Disclosure  Schedule sets
         forth a  complete  and  correct  list as of the date  hereof of (i) the
         number of options to purchase Company Common Stock  outstanding and the
         number of shares of Company Common Stock issuable thereunder,  (ii) the
         number of Common Stock Warrants outstanding and the number of shares of
         Company Common Stock issuable  thereunder,  (iii) the exercise price of
         each such  outstanding  stock  option and  warrant,  (iv) the number of
         stock options then exercisable, and (v) the number of shares of Company
         Common Stock issuable upon  conversion of the Series C Preferred  Stock
         if such  Series C Preferred  Stock was  converted  on the date  hereof.
         Complete and correct copies of the Company  Option Plans,  all forms of
         stock options issued pursuant to the Company Option Plans or otherwise,
         and all  forms of  Common  Stock  Warrants,  including  all  amendments
         thereto, have been made available to VTEL.

         Section 3.04. Authority.  The Company has all requisite corporate power
and  authority  to execute  and  deliver  this  Agreement  and the Stock  Option
Agreement, to perform its obligations hereunder and thereunder and to consummate
the  transactions  contemplated  hereby and thereby (subject to, with respect to
the Merger,  the approval and adoption of this Agreement by the  stockholders of
the Company as described in Section 6.01 of this  Agreement).  The execution and
delivery of this Agreement and the Stock Option Agreement by the Company and the
consummation by the Company of the transactions  contemplated hereby and thereby
have  been  duly  authorized  by all  necessary  corporate  action  and no other
corporate proceedings on the part of the Company are necessary to authorize this
Agreement  and the Stock Option  Agreement  or to  consummate  the  transactions
contemplated  hereby and thereby  (subject to, with  respect to the Merger,  the
approval and adoption of this  Agreement by the  stockholders  of the Company as
described  in Section  6.01 of this  Agreement).  This  Agreement  and the Stock
Option  Agreement have each been duly executed and delivered by the Company and,
assuming  the due  authorization,  execution  and  delivery  hereof  by the VTEL
Companies,  constitute the legal,  valid and binding  obligation of the Company,
enforceable against the Company in accordance with their terms.

         Section 3.05.     No Conflict: Required Filings and Consents.

                  (a)  Except as  disclosed  in Section  3.05(a) of the  Company
         Disclosure  Schedule,  the execution and delivery of this Agreement and
         the Stock Option  Agreement by the Company do not, and the  performance
         by the Company of its obligations  hereunder and thereunder,  including
         consummation of the transactions  contemplated hereby and thereby, will
         not (i) conflict with or violate the  Certificate of  Incorporation  or
         Bylaws,  or the equivalent  organizational  documents,  in each case as
         amended  or  restated,  of  the  Company  or  any  of  its  Significant
         Subsidiaries, (ii) conflict with or violate any federal, state, foreign
         or local law,  statute,  ordinance,  rule or regulation  (collectively,
         "Laws")  in effect as of the date of this  Agreement  or any  judgment,
         order or decree to which the  Company or any of its  subsidiaries  is a
         party or by or to which any of their respective properties are bound or
         subject or (iii) result in any breach of or constitute a default (or an
         event that with

CORPDAL:59869.4 22768-00022
                                                        12

<PAGE>



         notice  or lapse of time or both  would  become a  default)  under,  or
         impair any of the Company's or any of its Subsidiaries' rights or alter
         the rights or obligations  of any third party under,  or give to others
         any rights of termination,  amendment, acceleration or cancellation of,
         or  require  payment  under,  or  result in the  creation  of a lien or
         encumbrance on any of the properties or assets of the Company or any of
         its  subsidiaries  pursuant to, any note,  bond,  mortgage,  indenture,
         contract,   agreement,  lease,  license,  permit,  franchise  or  other
         instrument   or   obligation  to  which  the  Company  or  any  of  its
         subsidiaries  is a party or by or to which  the  Company  or any of its
         subsidiaries or any of their respective properties are bound or subject
         (including,  but not  limited to, any  license  agreement,  contract or
         other arrangement of any nature relating to the Company's  Intellectual
         Property Rights or Third Party  Intellectual  Property Rights (as those
         terms are hereinafter  defined)),  excluding from the foregoing clauses
         (ii) and  (iii) any such  conflicts,  violations,  breaches,  defaults,
         events, rights of termination, amendment, acceleration or cancellation,
         payment  obligations or liens or encumbrances  that  individually or in
         the  aggregate  could  not  reasonably  be  expected  to have a Company
         Material  Adverse  Effect.  The Board of  Directors  of the Company has
         approved the Merger, this Agreement and the Stock Option Agreement, and
         the  transactions  contemplated  by this Agreement and the Stock Option
         Agreement and such  approval is sufficient to render the  provisions of
         Section 203 of the DGCL inapplicable to the Merger,  this Agreement and
         the Stock Option Agreement,  and the transactions  contemplated  hereby
         and thereby.  To the best of the  Company's  knowledge,  no other state
         takeover  statute or similar statute or regulation  applies or purports
         to apply to the Merger,  this Agreement and the Stock Option Agreement,
         or any of the  transactions  contemplated  by this  Agreement or by the
         Stock Option Agreement.

                  (b) The execution and delivery of this Agreement and the Stock
         Option  Agreement by the Company does not, and the  performance  by the
         Company  of  its  obligations   hereunder  and  thereunder,   including
         consummation of the transactions  contemplated hereby and thereby, will
         not,  require  the  Company to obtain  any  consent,  license,  permit,
         waiver, approval, authorization or order of, or to make any filing with
         or notification to, any governmental or regulatory authority,  federal,
         state, local or foreign (collectively, "Governmental Entities"), except
         (i) for (A) applicable requirements, if any, of the Securities Act, the
         Securities  Exchange Act of 1934, as amended (the "Exchange  Act"), and
         state  securities  or blue  sky  laws  ("Blue  Sky  Laws")  and (B) the
         pre-merger notification requirements of the Hart-Scott-Rodino Antitrust
         Improvements  Act of 1976, as amended (the "HSR Act"),  (ii) the filing
         and  recordation  of  appropriate  merger  documents as required by the
         DGCL,  and (iii) where the failure to obtain such  consents,  licenses,
         permits, waivers, approvals,  authorizations or orders, or to make such
         filings or  notifications  could not,  individually or in the aggregate
         reasonably be expected to cause a Company Material Adverse Effect or to
         materially  impair or delay the  ability of the  Company to perform its
         obligations  under this Agreement and the Stock Option  Agreement or to
         consummate the transactions contemplated hereby and thereby.


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<PAGE>



         Section 3.06. Permits: Compliance.  Except as disclosed in Section 3.06
of the Company Disclosure Schedule,  each of the Company and its subsidiaries is
in possession of all  franchises,  grants,  authorizations,  licenses,  permits,
easements, variances,  exemptions,  consents,  certificates,  identification and
registration  numbers,  approvals  and  orders  (collectively,   the  "Permits")
necessary  to own,  lease and  operate  their  properties  and to carry on their
businesses as they are now being conducted,  except where the failure to possess
such Permits could not reasonably be expected to have a Company Material Adverse
Effect.  Section 3.06 of the Company  Disclosure  Schedule sets forth, as of the
date of this Agreement, all actions, proceedings, or investigations, pending or,
to the  knowledge of the Company,  threatened  against the Company or any of its
subsidiaries   that  could  reasonably  be  expected  to  result  in  the  loss,
revocation,  suspension  or  cancellation  of a Permit  held by the Company or a
subsidiary of the Company,  except for any  suspension,  loss or revocation that
could not  reasonably  be expected to have a Company  Material  Adverse  Effect.
Except as set forth in Section 3.06 of the Company Disclosure Schedule,  neither
the Company nor any of its subsidiaries is in conflict with, in default under or
in  violation  of,  nor has it  received,  since  December  31,  1993,  from any
Governmental  Entity any written notice with respect to possible conflicts with,
defaults  under or violations of (a) any Law applicable to the Company or any of
its subsidiaries or by or to which any of their respective  properties are bound
or subject,  (b) any judgment,  order or decree applicable to the Company or any
of  its  subsidiaries,  or (c)  any of the  Permits  held  by the  Company  or a
subsidiary of the Company, except for any such conflicts, defaults or violations
that individually or in the aggregate could not reasonably be expected to have a
Company Material Adverse Effect.

         Section 3.07.   Reports; Financial Statements; Undisclosed Liabilities.

                  (a) Since  December 31,  1993,  except as disclosed in Section
         3.07 of the  Company  Disclosure  Schedule,  the  Company has filed all
         forms,  reports,  statements and other  documents  required to be filed
         with the Securities  and Exchange  Commission  (the "SEC"),  including,
         without  limitation,  (i) all Annual  Reports  on Form  10-K,  (ii) all
         Quarterly Reports on Form 10-Q, (iii) all proxy statements  relating to
         meetings of stockholders (whether annual or special),  (iv) all Current
         Reports on Form 8-K and (v) all other reports, schedules,  registration
         statements or other documents (collectively referred to as the "Company
         SEC Reports").  As of their  respective  dates, the Company SEC Reports
         complied in all material  respects with the  requirements of applicable
         Laws (including the Securities Act or the Exchange Act, as the case may
         be, and the rules and  regulations of the SEC thereunder  applicable to
         such  Company SEC  Reports)  and the Company  SEC  Reports,  including,
         without  limitation,  any financial  statements  or schedules  included
         therein,  did not at the  time  they  were  filed  contain  any  untrue
         statement of a material  fact or omit to state a material fact required
         to be  stated  therein  or  necessary  in order to make the  statements
         therein,  in the light of the circumstances under which they were made,
         not misleading.

                  (b)      The Company has heretofore delivered to VTEL
         (i) consolidated balance sheets of the Company and its subsidiaries as
         of December 31, 1993, December 31, 1994

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                                                        14

<PAGE>



         and  December  31,  1995 and (ii)  consolidated  statements  of income,
         stockholders'  equity and cash  flows for each of the three  years then
         ended, certified by KPMG Peat Marwick LLP, reports thereon are included
         therewith.  The Company  has also  delivered  to VTEL (i) an  unaudited
         consolidated  balance sheet of the Company and its  subsidiaries  as of
         September  30, 1996,  and (ii)  unaudited  consolidated  statements  of
         income,  stockholders'  equity and cash flows for the nine  months then
         ended. Such audited and unaudited  consolidated  financial  statements,
         including any such financial  statements and schedules contained in the
         Company SEC reports (or  incorporated by reference  therein) (i) are in
         accordance   with  the  books  and  records  of  the  Company  and  its
         subsidiaries  in all material  respects and were prepared in accordance
         with the  published  rules  and  regulations  of the SEC and  generally
         accepted accounting principles applied on a consistent basis throughout
         the periods  involved  (except (A) to the extent  disclosed  therein or
         required by changes in generally accepted  accounting  principles,  (B)
         with respect to Company SEC  Reports,  as may be indicated in the notes
         thereto and (C) in the case of the unaudited financial  statements,  as
         permitted  by the rules  and  regulations  of the SEC) and (ii)  fairly
         present in all material respects the consolidated financial position of
         the Company and its subsidiaries as of the respective dates thereof and
         the  consolidated  results of operations and cash flows for the periods
         indicated  (except,  in the case of  unaudited  consolidated  financial
         statements  for  interim  periods,  for the  absence of  footnotes  and
         subject to adjustments,  consisting only of normal, recurring accruals,
         necessary to present fairly such results of operations and cash flows).

                  (c) Except as and to the extent set forth on the  consolidated
         balance  sheet of the Company and its  subsidiaries  as of December 31,
         1995, including the notes thereto, or in the Company's Quarterly Report
         on Form 10-Q for the quarter  ended  September  30, 1996,  or other SEC
         Report  filed prior to the date  hereof,  neither the Company or any of
         its  subsidiaries  has any  liabilities or obligations  material to the
         Company and its  subsidiaries  which are not referenced on such balance
         sheet or in such  Quarterly  Report on Form  10-Q or in such  other SEC
         Report filed prior to the date  hereof.  Except as set forth in Section
         3.07  of  the  Company  Disclosure  Schedule  or as  set  forth  in the
         Company's  Current Report on Form 8-K filed with the SEC on October 24,
         1996,  since the date of the Company's  most recently  filed  Quarterly
         Report on Form 10-Q,  neither the  Company nor any of its  subsidiaries
         has incurred any liabilities  except for (i) liabilities or obligations
         incurred in the ordinary  course of business and  consistent  with past
         practice,  (ii) liabilities  incurred in connection with or as a result
         of the Merger and (iii)  liabilities or obligations which do not have a
         Company Material Adverse Effect.

         Section 3.08. Absence of Certain Changes or Events. Except as disclosed
in the Company SEC Reports  filed prior to the date of this  Agreement or as set
forth in Section 3.08 of the Company  Disclosure  Schedule,  since September 30,
1996,  the  Company  and  its  subsidiaries   have  conducted  their  respective
businesses  only in the  ordinary  course and in a manner  consistent  with past
practice and there has not been (a) any damage, destruction or loss with respect
to any assets of the  Company or any of its  subsidiaries  that,  whether or not
covered by insurance, would

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<PAGE>



constitute a Company Material  Adverse Effect,  (b) any change by the Company or
its  subsidiaries  in their  significant  accounting  policies,  (c)  except for
dividends by a subsidiary of the Company to the Company or another  wholly owned
subsidiary  of the Company,  any  declaration,  setting  aside or payment of any
dividends or  distributions  in respect of shares of Company Common Stock or the
shares of stock of, or other equity  interests in, any subsidiary of the Company
or any  redemption,  purchase  or  other  acquisition  of  any of the  Company's
securities or any of the  securities of any  subsidiary of the Company,  (d) any
material  increase in the benefits under, or the  establishment or amendment of,
any bonus, insurance,  severance,  deferred compensation,  pension,  retirement,
profit sharing, performance awards (including,  without limitation, the granting
of stock  appreciation  rights or restricted  stock  awards),  stock purchase or
other employee benefit plan, or any increase in the  compensation  payable or to
become  payable  to any of the  directors  or  officers  of the  Company  or the
employees  of the  Company  or its  subsidiaries  as a  group,  except  for  (i)
increases  in salaries  or wages  payable or to become  payable in the  ordinary
course of business  and  consistent  with past  practice or (ii) the granting of
stock options in the ordinary  course of business to employees of the Company or
its subsidiaries who are not directors or executive officers of the Company,  or
(e) any Company Material Adverse Effect.

         Section  3.09.  Absence of  Litigation.  Except as set forth in Section
3.09 of the  Company  Disclosure  Schedule,  there is no  claim,  action,  suit,
litigation,  proceeding,  arbitration  or,  to the  knowledge  of  the  Company,
investigation of any kind, at law or in equity (including actions or proceedings
seeking  injunctive  relief),  pending  or,  to the  knowledge  of the  Company,
threatened  against the Company or any of its  subsidiaries or any properties or
rights of the  Company or any of its  subsidiaries,  and neither the Company nor
any of its  subsidiaries is subject to any continuing  order of, consent decree,
settlement  agreement  or other  similar  written  agreement  with,  or,  to the
knowledge of the Company,  continuing investigation by, any Governmental Entity,
or any judgment,  order, writ,  injunction,  decree or award of any Governmental
Entity or arbitrator,  including, without limitation,  cease-and-desist or other
orders.

         Section 3.10.     Employee Benefit Plans; Labor Matters.

                  (a) With  respect  to each  employee  benefit  plan,  program,
         arrangement,  contract,  employment  agreement,  stock  option,  bonus,
         incentive or similar plan (including, without limitation, any "employee
         benefit  plan" as defined in Section  3(3) of the  Employee  Retirement
         Income  Security  Act of 1974,  as amended  ("ERISA")),  maintained  or
         contributed  to by the  Company  or any of its  subsidiaries,  or  with
         respect  to  which  the  Company  or  any  of  its  subsidiaries  could
         reasonably  be expected to incur  liability  under ERISA (the  "Company
         Benefit Plans"),  the Company has delivered or made available to VTEL a
         true and correct copy of (i) such Company Benefit Plan, (ii) each trust
         agreement,  if any,  relating to such Company  Benefit Plan,  (iii) the
         most recent summary plan  description of each Company  Benefit Plan for
         which a summary plan description is required,  and (iv) the most recent
         determination  letter  issued by the IRS with  respect  to any  Company
         Benefit Plan that is intended to be qualified  under Section 401 of the
         Code.

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<PAGE>



         Section  3.10 of the Company  Disclosure  Schedule  contains a complete
         list of all Company Benefit Plans.

                  (b) Each of the  Company  Benefit  Plans  that are  subject to
         ERISA is in compliance  with ERISA,  and except as set forth in Section
         3.10 of the Company Disclosure Schedule, no Company Benefit Plan has an
         accumulated or waived funding  deficiency within the meaning of Section
         412 of the Code.  Except as set forth in  Section  3.10 of the  Company
         Disclosure   Schedule,   none  of  the  Company   Benefit  Plans  is  a
         "multiemployer plan," as defined in Section 3(37) of ERISA. Neither the
         Company nor any trade or business which together with the Company would
         be deemed a "single  employer"  within the  meaning of ERISA (an "ERISA
         Affiliate")  has  incurred,   directly  or  indirectly,   any  material
         liability  (including  any  material  contingent  liability)  to  or on
         account  of a Company  Benefit  Plan  pursuant  to Title IV of ERISA to
         which the Company or an ERISA  Affiliate made, or was required to make,
         contributions during the five (5) years ending on December 31, 1995. As
         of the date of this Agreement,  no condition is known by the Company to
         exist  that  presents  a  material  risk  to the  Company  or an  ERISA
         Affiliate of incurring such a material  liability.  No proceedings have
         been  instituted to terminate any Company  Benefit Plan that is subject
         to Title IV of ERISA and no "reportable event," as such term in defined
         in Section  4043(b) of ERISA, is known to have occurred with respect to
         any Company Benefit Plan which has not been reported.

                  (c)  Except  as set  forth  in  Section  3.10  of the  Company
         Disclosure  Schedule,  the  current  value of the assets of each of the
         Company Benefit Plans that are subject to Title IV of ERISA, based upon
         reasonable actuarial  assumptions,  equals or exceeds the present value
         of the accrued  benefits  under each such Company  Benefit Plan and all
         contributions  or other amounts  payable by the Company and each of its
         subsidiaries as of the date of this Agreement with respect to each Plan
         in respect of  current  or prior  plan  years has been  either  paid or
         accrued on the latest  balance  sheet  included in the  Company's  most
         recent SEC Report on Form 10-Q or accrued  since  September  30,  1996.
         There are no pending, or, to the best knowledge of the Company and each
         of its  subsidiaries,  threatened  or  anticipated  claims  (other than
         routine  claims for  benefits)  by, on behalf of or against  any of the
         Company Benefit Plans or any trusts related thereto.

                  (d) There are no  collective  bargaining  or other labor union
         contracts  to which the Company or its  subsidiaries  is a party and no
         collective  bargaining  agreement is being negotiated by the Company or
         any of its  subsidiaries.  There is no pending or, to the  knowledge of
         the Company,  threatened labor dispute, strike or work stoppage against
         the Company or any of its subsidiaries.

                  (e) No  Company  Benefit  Plan  provides  retiree  medical  or
         retiree life insurance  benefits and neither the Company nor any of its
         subsidiaries is  contractually  or otherwise  obligated to provide life
         insurance  and medical  benefits  upon  retirement  or  termination  of
         employment of employees.

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<PAGE>




                  (f)  Neither   the   Company  nor  any  of  its   subsidiaries
         contributes to or has an obligation to contribute to, or has within six
         years  prior to the  date of this  Agreement  contributed  to or had an
         obligation  to contribute  to, an employee  benefit plan that is or was
         subject to Title IV of ERISA or Section 412 of the Code.

         Section 3.11.     Taxes.  Except as set forth in Section 3.11 of the
         Company Disclosure Schedule:

                  (a) (i) all  returns and reports  ("Tax  Returns")  of or with
         respect  to any  material  Tax  (as  defined  in  Section  9.03 of this
         Agreement)  which are required to be filed on or before the date hereof
         by or with respect to the Company or any of its subsidiaries  have been
         duly and timely filed, (ii) all items of income,  gain, loss, deduction
         and credit or other  items  required  to be  included  in each such Tax
         Return have been so included and all information  provided in each such
         Tax Return is true,  correct  and  complete in all  material  respects,
         (iii) all  material  Taxes  which have  become due with  respect to the
         period covered by each such Tax Return have been or will be timely paid
         in full,  (iv) all  withholding  Tax  requirements  imposed  on or with
         respect to the Company or any of its  subsidiaries  have been satisfied
         in all  material  respects,  and (v) no material  penalty,  interest or
         other  charge is due with  respect  to the late  filing of any such Tax
         Return or late payment of any such Tax .

                  (b) Section 3.11 of the Company Disclosure  Schedule lists all
         federal  and other  material  Tax  Returns  filed  with  respect to the
         Company  and any of its  subsidiaries  for taxable  years  ending on or
         after  December 31, 1992. The Company has delivered to VTEL correct and
         complete copies of all such Tax Returns.

                  (c) There is no material  claim  against the Company or any of
         its subsidiaries for any amount of Taxes, no assessment,  deficiency or
         adjustment has been asserted or proposed with respect to any Tax Return
         of or with  respect to the Company or any of its  subsidiaries,  and no
         material  Tax Return of or with  respect  to the  Company or any of its
         subsidiaries  has been,  or is being,  audited by the Internal  Revenue
         Service or any state,  local or other taxing authority other than those
         disclosed  (and to which are attached  true and complete  copies of all
         audit or similar  reports) in Section  3.11 of the  Company  Disclosure
         Schedule.

                  (d) The total  amounts set up as  liabilities  for current and
         deferred Taxes in the financial  statements referred to in Section 3.07
         of this  Agreement  are  sufficient  to cover the payment of all Taxes,
         whether or not assessed or disputed,  which are, or are hereafter found
         to be, or to have been,  due by or with  respect to the Company and any
         of its subsidiaries up to and through the periods covered thereby.


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<PAGE>



                  (e) Except for  statutory  liens for current Taxes not yet due
         and for Taxes being  contested in good faith which have been  disclosed
         in  Section  3.11 of the  Company  Disclosure  Schedule  and for  which
         adequate provisions have been made in the financial statements referred
         to in Section 3.07,  no material  liens for Taxes exist upon the assets
         of any of the Company or any of its subsidiaries.

                  (f) Neither the Company nor any of its subsidiaries has waived
         any statute of  limitations  in respect of material  Taxes or agreed to
         any  extension  of time with respect to a material  Tax  assessment  or
         deficiency.

                  (g) Neither the Company nor any of its  subsidiaries  has made
         an election  under Section  341(f) of the Code.  Except as disclosed in
         Section 3.11 of the Company  Disclosure  Schedule,  neither the Company
         nor any of its subsidiaries has made any payments, is obligated to make
         any  payments,   or  is  a  party  to  any  agreement  that  under  the
         circumstances  could  obligate it to make any payments that will not be
         deductible under Sections 162(m) or 280G of the Code.

                  (h) Neither the Company nor any of its  subsidiaries has taken
         or agreed  to take any  action  that  would  prevent  the  Merger  from
         constituting  a  reorganization  qualifying  under  the  provisions  of
         Section 368(a) of the Code.

                  (i) Neither the  Company nor any of its  subsidiaries  (i) has
         ever been a member of an  Affiliated  Group (as defined in Section 1504
         of the  Code)  other  than a group the  common  parent of which was the
         Company or (ii) has any  liability  for the Taxes of any person  (other
         than the Company or any of its  subsidiaries)  under  Treas.  Reg.  ss.
         1.1502-6 (or any similar provision under state, local, or foreign law),
         as a transferee or successor, by contract, or otherwise.

                  (j)  Except  for the  Merger,  there  has  been no  "ownership
         change" (as defined in Section  382(g) of the Code) with respect to the
         Company  during the "testing  period" (as defined in Section  382(i) of
         the Code) that ends on the day on which the "owner  shift" (as  defined
         in Section 382(g) of the Code) occurs as a result of the Merger.

         Section  3.12.  Affiliates.  Section  3.12  of the  Company  Disclosure
Schedule  identifies  all persons who, to the  knowledge of the Company,  may be
deemed to be affiliates  of the Company  within the meaning of that term as used
in Rule 145  promulgated  pursuant to the  Securities  Act,  including,  without
limitation, all directors and executive officers of the Company.

         Section  3.13.  Properties.  Except as set forth in Section 3.13 of the
Company  Disclosure  Schedule  or  specifically  described  in the  Company  SEC
Reports,  the Company and its subsidiaries  have good and marketable title, free
and clear of all liens, to all their  properties and assets whether  tangible or
intangible,  real,  personal or mixed,  reflected in the Company's  consolidated
financial  statements  contained in the Company's most recent SEC Report on Form
10-Q as being owned

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<PAGE>



by the Company and its  subsidiaries as of the date thereof,  other than (a) any
properties  or  assets  that  have been  sold or  otherwise  disposed  of in the
ordinary  course of business  since the date of such financial  statements,  (b)
liens disclosed in the notes to such financial  statements and (c) liens arising
in the ordinary course of business after the date of such financial statements.

         Section 3.14.     Intellectual Rights.

                  (a) The Company  owns,  or is licensed or otherwise  possesses
         legally sufficient rights to use, all patents, trademarks, trade names,
         service marks,  copyrights,  maskworks and any  applications  therefor,
         technology,  know-how, video and audio compression algorithms, computer
         software  programs or applications (in both source code and object code
         form) and tangible or intangible  proprietary  information  or material
         that are used or proposed to be used in the  business of the Company as
         currently  conducted.  Section 3.14 of the Company Disclosure  Schedule
         lists  all  current  patents,   registered  and  material  unregistered
         copyrights,  maskworks, trade names and any applications therefor owned
         by the Company (the "Intellectual  Property Rights"), and specifies the
         jurisdictions in which each such  Intellectual  Property Right has been
         issued or registered or in which an  application  for such issuance and
         registration has been filed,  including the respective  registration or
         application  numbers and the names of all  registered  owners.  Section
         3.14 of the  Company  Disclosure  Schedule  includes  and  specifically
         identifies all material  third-party  patents,  trademarks,  copyrights
         (including  software)  and  maskworks  (the "Third  Party  Intellectual
         Property  Rights"),  to  the  knowledge  of  the  Company,   which  are
         incorporated in, are, or form a part of, any Company product, excluding
         any such intellectual property rights that are available on a commodity
         basis (such as "shrink  wrap"  licenses)  and which are  non-exclusive,
         terminable and available at a standard fee. Section 3.14 of the Company
         Disclosure  Schedule lists (i) all material  licenses,  sublicenses and
         other  agreements  as to which the  Company is a party and  pursuant to
         which any person is authorized to use any of the Company's Intellectual
         Property Rights,  or any trade secret material to the Company or any of
         its subsidiaries; and (ii) all material licenses, sublicenses and other
         agreements as to which the Company is a party and pursuant to which the
         Company is  authorized  to use any Third  Party  Intellectual  Property
         Rights,  or other trade  secret of a third party in or as any  product,
         and includes the identity of all parties thereto,  a description of the
         nature and subject matter thereof and the term thereof.

                  (b) The  Company  is not,  nor will it be as a  result  of the
         execution  and  delivery of this  Agreement or the  performance  of its
         obligations  hereunder,  in  violation of any  license,  sublicense  or
         agreement  described  in  Section  3.14(a)  of the  Company  Disclosure
         Schedule. No claims with respect to the Company's Intellectual Property
         Rights,  any trade  secret  material  to the  Company,  or Third  Party
         Intellectual  Property  Rights to the  extent  arising  out of any use,
         reproduction or distribution of such Third Party Intellectual  Property
         Rights by or through  the  Company,  are  currently  pending or, to the
         knowledge of the Company,  are  threatened by any person,  nor does the
         Company  know of any valid  grounds for any bona fide claims (i) to the
         effect that the manufacture, sale, licensing or

CORPDAL:59869.4 22768-00022
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<PAGE>



         use of any product as now used,  sold or licensed or proposed  for use,
         sale or license by the Company  infringes on any  copyright,  maskwork,
         patent,  trademark,  service mark or trade secret; (ii) against the use
         by  the  Company  of  any  trademarks,   trade  names,  trade  secrets,
         copyrights,  maskworks, patents, technology,  know-how, video and audio
         compression algorithms,  or computer software programs and applications
         used in the Company's business as currently conducted or as proposed to
         be conducted by the Company; (iii) challenging the ownership,  validity
         or effectiveness of any of the Company's  Intellectual  Property Rights
         or other trade secret material to the Company;  or (iv) challenging the
         Company's  license  or  legally  enforceable  right to use of the Third
         Party  Intellectual  Rights. To the Company's  knowledge,  all material
         patents,  registered  trademarks,  maskworks and copyrights held by the
         Company are valid and subsisting. To the Company's knowledge,  there is
         no material  unauthorized use,  infringement or misappropriation of any
         of the Company's  Intellectual  Property by any third party,  including
         any  employee  or  former  employee  of the  Company  or any of the its
         subsidiaries.  Except as set forth in Section  3.14(b)  of the  Company
         Disclosure  Schedule,  neither the Company nor any of its  subsidiaries
         (i) has been sued or charged in  writing as a  defendant  in any claim,
         suit,  action or proceeding  which involves a claim or  infringement of
         trade secrets,  any patents,  trademarks,  service marks,  maskworks or
         copyrights and which has not been finally  terminated prior to the date
         hereof or been informed or notified by any third party that the Company
         may be  engaged  in such  infringement  or (ii)  has  knowledge  of any
         infringement liability with respect to, or infringement by, the Company
         or any of its  subsidiaries  of any trade  secret,  patent,  trademark,
         service mark, maskwork or copyright of another.

                  (c)   Each   employee   of  the   Company   has   executed   a
         confidentiality,  invention and copyright agreement with the Company in
         the forms previously delivered to VTEL.

         Section 3.15.     Real Property.  Section 3.15 of the Company
Disclosure Schedule lists all real property that is owned or leased by the
Company (other than sales offices and shared distribution space).

         Section 3.16. Insider Interests;  Transactions with Management.  Except
as set forth in Section 3.16 of the Company Disclosure  Schedule,  no officer or
director  of the  Company  or holder of more than five  percent  of the  Company
Common Stock currently  outstanding  has any interest in any material  property,
real or personal,  tangible or intangible,  including,  without limitation,  any
computer software or Company Intellectual Property Assets, used in or pertaining
to the business of the Company or any subsidiary of the Company,  except for the
ordinary  rights of a stockholder  or employee  stock option  holder.  Except as
disclosed  in the  Company  SEC  Reports,  no  executive  officer,  director  or
stockholder  of the Company or any of its  subsidiaries  has, since December 31,
1994,  engaged  in  any  business  dealings  with  the  Company  or  any  of its
subsidiaries,  other than such business  dealings as would not be required to be
disclosed in such  documents or reports  pursuant to the  Securities Act and the
rules and regulations promulgated  thereunder.  No executive officer or director
of the Company or any of its subsidiaries (except in

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<PAGE>



his  capacity as such) has any direct or indirect  material  interest in (a) any
competitor,   customer,  supplier  or  agent  of  the  Company  or  any  of  its
subsidiaries,  or (b) any person  which is a party to any  contract or agreement
which is material to the Company or any of its subsidiaries.

         Section 3.17.  Contracts and  Agreements.  The contracts and agreements
listed in Section 3.17 of the Company  Disclosure  Schedule or filed as exhibits
to any of the  Company SEC Reports  constitute  all of the written and  material
oral contracts,  commitments,  leases, and other agreements (including,  without
limitation,   promissory  notes,   loan  agreements,   and  other  evidences  of
indebtedness)  to which the Company or any of its  subsidiaries is a party or by
which any of their properties are bound with respect to which the obligations of
or the  benefits  to be  received  by the  Company  or any of its  subsidiaries,
individually or in the aggregate,  could  reasonably be expected to have a value
(i) in the case of liabilities,  in excess of $250,000,  and (ii) in the case of
benefits,  $1,000,000,  in any  consecutive  12-month  period  (each a "Material
Contract").  Except  as set  forth in  Section  3.17 of the  Company  Disclosure
Schedule,  neither the Company nor any of its  subsidiaries are and, to the best
knowledge of the Company, no other party thereto is in default (and no event has
occurred which, with the passage of time or the giving of notice, or both, would
constitute a default) under any Material  Contract,  and neither the Company nor
any of its  subsidiaries  have  waived any  material  right  under any  Material
Contract.  Neither the Company nor any of its  subsidiaries  have  received  any
notice  of  default  or  termination  (other  than,  in the case of  notices  of
termination,  such  termination  arising out of the  expiration  of any Material
Contract by lapse of time or completion of  performance  in accordance  with the
terms  thereof)  under any Material  Contract and neither the Company nor any of
its  subsidiaries  has  assigned or otherwise  transferred  any rights under any
Material Contract.

         Section 3.18. Vote Required. The only votes of the holders of any class
or series of Company  capital  stock  necessary  to approve  the Merger and this
Agreement are the affirmative votes of the holders of at least a majority of the
outstanding  shares of the Company Common Stock. The provisions of Article Sixth
of the Company's  Certificate of  Incorporation do not impose any super majority
voting requirement on the transactions contemplated hereby.

         Section 3.19.  Brokers.  No broker,  finder or investment banker (other
than PaineWebber  Incorporated) is entitled to any brokerage,  finder's or other
fee or commission  in  connection  with the  transactions  contemplated  by this
Agreement based upon arrangements made by or on behalf of the Company.  Prior to
the date of this  Agreement,  the Company has made  available to VTEL a complete
and  correct  copy  of  all  agreements  between  the  Company  and  PaineWebber
Incorporated  pursuant  to which  such  firm  will be  entitled  to any  payment
relating to the transactions contemplated by this Agreement.

         Section 3.20. Opinion of Financial  Advisor.  The Board of Directors of
the Company has received the written opinion of PaineWebber  Incorporated to the
effect that, as of the date of this Agreement,  the Merger  Consideration  to be
paid to the holders of the Company Common Stock is fair,  from a financial point
of view,  to such  holders.  The Company  will  promptly  deliver a copy of such
opinion to VTEL.

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<PAGE>




         Section  3.21.  Board  Recommendations.  By a  unanimous  vote  of  the
directors  present  at a meeting  of the  Company's  Board of  Directors  (which
meeting  was duly  called  and held and at  which a quorum  was  present  at all
times),  the Board of  Directors  of the Company (a)  approved  and adopted this
Agreement,  including  the Merger and the Stock Option  Agreement  and the other
transactions  contemplated herein and therein, and determined that the Merger is
fair to the stockholders of the Company,  and (b) resolved to recommend approval
and adoption of this Agreement,  including the Merger and the other transactions
contemplated herein, by the stockholders of the Company.

         Section 3.22. Distributors, Customers, or Suppliers. The Company is not
aware that any major  distributor,  customer or supplier to or of the Company or
its  subsidiaries  intends to cease doing business,  or to alter  materially the
amount  of  business  done,  with the  Company  or its  subsidiaries  after  the
Effective Time, due to consummation of the transactions  contemplated  hereunder
or any other reason, that would result in a Company Material Adverse Effect.

         Section 3.23.     Pooling of Interests.  As of the date of this
Agreement, the Company has no reason to believe that the Merger will not qualify
as a "pooling of interests" for accounting purposes.

         Section 3.24.  Rights Plan. The Company has taken all action (including
amending the  Company's  Rights Plan, as defined in Section  5.01(h)  hereof) so
that the entering of this Agreement and the Stock Option Agreement and the other
transactions  contemplated  hereby and thereby do not and will not result in the
grant of any rights to any person under the  Company's  Rights Plan or enable or
require any rights thereunder to be exercised, distributed or triggered.

         Section 3.25.     Disclosure.  No representation or warranty hereunder
contains any untrue statement of material fact or omits to state a material fact
necessary in order to make the statements contained therein or herein not
misleading.

                                   ARTICLE IV
         REPRESENTATIONS AND WARRANTIES OF THE VTEL COMPANIES

         The VTEL Companies hereby, jointly and severally, represent and warrant
to the Company that:

         Section 4.01. Organization and Qualification; Subsidiaries. Each of the
VTEL  Companies is a  corporation,  and each of VTEL's other  subsidiaries  is a
corporation,  duly  organized,  validly  existing and in good standing under the
laws of its  jurisdiction  of  incorporation  and each of the VTEL Companies and
each of VTEL's other  subsidiaries has all requisite power and authority to own,
lease and operate its properties and to carry on its business as it is now being
conducted  and is duly  qualified  and in good  standing  to do business in each
jurisdiction  in  which  the  nature  of  the  business  conducted  by it or the
ownership or leasing of its properties makes such qualification

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<PAGE>



necessary,  other than where the  failure  to be so duly  qualified  and in good
standing  could not  reasonably  be  expected  to have a VTEL  Material  Adverse
Effect.  The term "VTEL Material Adverse Effect" as used in this Agreement shall
mean any change or effect  that  would be  materially  adverse to the  financial
condition,  results  of  operations,  business,  or  prospects  of VTEL  and its
subsidiaries,  taken as a whole, at the time of such change or effect; provided,
however,  no VTEL  Material  Adverse  Effect  shall be deemed  to have  occurred
hereunder (i) as a result of customers of VTEL deferring or delaying orders as a
result of the  announcement  of the  execution  of this  Agreement,  (ii) if the
financial  condition  or  results  of  operations  of  VTEL's  business  are not
materially and adversely  different from those  announced with respect to VTEL's
quarter  ended  October 31, 1996,  or (iii) as a result of the Company  employee
departures  after the  announcement of the execution of this Agreement.  Section
4.01 of the Disclosure  Schedule  delivered by VTEL to the Company  concurrently
with the  execution of this  Agreement  (the "VTEL  Disclosure  Schedule")  sets
forth,  as of the date of this  Agreement,  a true and  complete  list of all of
VTEL's  directly  or  indirectly  owned  subsidiaries,  together  with  (a)  the
jurisdiction  of  incorporation  or organization of each such subsidiary and the
percentage of each such subsidiary's  outstanding  capital stock or other equity
interests  owned by VTEL or another  subsidiary of VTEL and (b) an indication of
whether each such subsidiary is a "Significant Subsidiary" as defined in Section
9.03 of this Agreement.

         Section  4.02.  Certificate  of  Incorporation  and  Bylaws.  VTEL  has
heretofore  furnished  or made  available  to the Company  complete  and correct
copies of the Certificate of Incorporation  and Bylaws,  in each case as amended
or restated to the date hereof,  of VTEL and Merger Sub. Neither VTEL nor any of
its  subsidiaries is in violation of any of the provisions of its Certificate of
Incorporation or Bylaws (or equivalent organizational documents).

         Section 4.03.     Capitalization.

                  (a)  The   authorized   capital  stock  of  VTEL  consists  of
         25,000,000 shares of VTEL Common Stock, par value $.01 per share ("VTEL
         Common Stock"),  and 10,000,000  shares of preferred  stock,  par value
         $.01 per share  ("VTEL  Preferred  Stock").  As of  December  1,  1996,
         13,940,567  shares of VTEL Common  Stock were  issued and  outstanding,
         407,848  shares of VTEL Common Stock were held by VTEL in its treasury,
         and 2,951,915 shares of VTEL Common Stock were reserved for issuance as
         follows:  (i) 1,973,471 shares were reserved for issuance upon exercise
         of stock options  heretofore granted or available for grant pursuant to
         VTEL's 1989 Stock Option Plan;  (ii) 700,000  shares were  reserved for
         issuance upon exercise of stock options heretofore granted or available
         for grant  pursuant to VTEL's 1996 Stock  Option  Plan;  (iii)  195,276
         shares were reserved for issuance upon the purchase of shares under the
         VTEL Employee Stock Purchase Plan; and (iv) 83,168 shares were reserved
         for  issuance  upon  exercise of stock  options  heretofore  granted or
         available for grant  pursuant to the VTEL 1992 Director Plan (the stock
         option  plans  referenced  in clauses (i) through  (iv) of this section
         being herein collectively called the "VTEL Option Plans"). No shares of
         VTEL Preferred Stock are issued or outstanding.  Except as described in
         this Section 4.03 or in Section 4.03(a) of

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<PAGE>



         the VTEL  Disclosure  Schedule,  no shares of capital stock of VTEL are
         reserved for issuance for any other purpose.  Each of the issued shares
         of capital stock of, or other equity interests in, each of VTEL and its
         subsidiaries  is duly  authorized,  validly  issued and, in the case of
         shares of capital  stock,  fully paid and  nonassessable,  and have not
         been issued in  violation of (nor are any of the  authorized  shares of
         capital  stock  of, or other  equity  interests  in,  VTEL or an of its
         subsidiaries  subject to) any  preemptive or similar  rights created by
         statute,  the Certificate of Incorporation or Bylaws (or the equivalent
         organizational  documents) of VTEL or any of its  subsidiaries,  or any
         agreement  to which  VTEL or any of its  subsidiaries  is a party or is
         bound,  and,  except  as set  forth  in  Section  4.03(a)  of the  VTEL
         Disclosure Schedule, all issued shares or other equity interests in the
         subsidiaries  of VTEL owned by VTEL or a  subsidiary  of VTEL are owned
         free and  clear of all  security  interests,  liens,  claims,  pledges,
         agreements,  limitations on VTEL's or such subsidiary's  voting rights,
         charges or other encumbrances of any nature whatsoever.

                  (b) No bonds, debentures,  notes or other indebtedness of VTEL
         having  the  right  to vote (or  convertible  into or  exchangeable  or
         exercisable for securities  having the right to vote) on any matters on
         which  stockholders  may  vote  ("VTEL  Voting  Debt")  are  issued  or
         outstanding.  All shares of VTEL Common  Stock which may be issued upon
         exercise of stock  options  granted  pursuant to the VTEL Option  Plans
         will,  when issued in  accordance  with the terms of such stock options
         and the related VTEL Option Plans,  be validly  issued,  fully paid and
         nonassessable and not subject to preemptive rights

                  (c) Except as set forth in Section 4.03(a) above or in Section
         4.03(c) of the VTEL Disclosure Schedule, there are no options, warrants
         or  other   rights   (including   registration   rights),   agreements,
         arrangements  or  commitments  of any character to which VTEL or any of
         its  subsidiaries is a party relating to the issued or unissued capital
         stock of VTEL or any of its  subsidiaries  or obligating VTEL or any of
         its  subsidiaries to grant,  issue or sell any shares of capital stock,
         VTEL  Voting  Debt  or  other  equity  interests  of VTEL or any of its
         subsidiaries.  Except  as set  forth  in  Section  4.03(c)  of the VTEL
         Disclosure Schedule, there are no obligations, contingent or otherwise,
         of  VTEL  or any of its  subsidiaries  (i)  to  repurchase,  redeem  or
         otherwise  acquire  any shares of VTEL  Common  Stock or other  capital
         stock of VTEL or the capital  stock of any  subsidiary  of VTEL or (ii)
         other than advances to wholly owned subsidiaries in the ordinary course
         of business,  to provide funds to, or to make any investment in (in the
         form of a loan, capital  contribution or otherwise),  or to provide any
         guarantee with respect to the obligations of, any subsidiary of VTEL or
         any other  person.  Except as set forth in Section  4.03(c) of the VTEL
         Disclosure  Schedule,  neither  VTEL  nor any of its  subsidiaries  (x)
         directly or  indirectly  owns,  (y) has agreed to purchase or otherwise
         acquire or (z) holds any interest  convertible  into or exchangeable or
         exercisable   for  the  capital   stock  or  other   equity   interests
         representing 5% or more of the capital stock in equity interests of any
         corporation,  partnership,  joint venture or other business association
         or  entity.  Except  as set  forth  in  Section  4.03(c)  of  the  VTEL
         Disclosure Schedule or for any agreements,

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<PAGE>



         arrangements   or  commitments   between  VTEL  and  its  wholly  owned
         subsidiaries  or between such wholly owned  subsidiaries,  there are no
         agreements, arrangements or commitments of any character (contingent or
         otherwise)  pursuant  to which  any  person  is or may be  entitled  to
         receive any payment based on, or calculated  in  accordance  with,  the
         revenues or earnings of VTEL or any of its subsidiaries.  Except as set
         forth in Section 4.03(c) of the VTEL Disclosure Schedule,  there are no
         voting trusts,  proxies or other agreements or  understandings to which
         VTEL or any of its  subsidiaries  is a party or by which VTEL or any of
         its  subsidiaries  is bound with respect to the voting of any shares of
         capital  stock  or  other  equity  interests  of  VTEL  or  any  of its
         subsidiaries.

                  (d) The  authorized  capital  stock of Merger Sub  consists of
         1,000  shares of common  stock,  par value $.0l per share  ("Merger Sub
         Common Stock"). An aggregate of 1,000 shares of Merger Sub Common Stock
         are  issued  and  outstanding  and held by VTEL,  all of which are duly
         authorized,  validly  issued,  fully  paid  and  nonassessable  and not
         subject  to  preemptive   rights  created  by  statute,   Merger  Sub's
         Certificate of Incorporation or Bylaws or any agreement to which Merger
         Sub is a party or is bound.

                  (e) The shares of VTEL Common  Stock to be issued  pursuant to
         the Merger  will be duly  authorized,  validly  issued,  fully paid and
         nonassessable  and not subject to preemptive rights created by statute,
         VTEL's Certificate of Incorporation or Bylaws or any agreement to which
         VTEL is a party or is bound.

         Section 4.04.  Authority.  Each of the VTEL Companies has all requisite
corporate  power and  authority  to execute and deliver this  Agreement  and the
Stock  Option  Agreement  to which it is a party and to perform its  obligations
hereunder and thereunder and to consummate the transactions  contemplated hereby
and thereby.  The execution and delivery of this  Agreement and the Stock Option
Agreement by each of the VTEL Companies and the  performance by each of the VTEL
Companies  of  its   obligations   hereunder  and   thereunder,   including  the
consummation of the transactions contemplated hereby and thereby, have been duly
authorized by all necessary corporate action and no other corporate  proceedings
on the part of either of the VTEL  Companies  are  necessary to  authorize  this
Agreement  and the Stock Option  Agreement  or to  consummate  the  transactions
contemplated  hereby and thereby  (subject to, with  respect to the Merger,  the
approval and adoption of this Agreement by the stockholders of VTEL as set forth
in  Section  6.01 of this  Agreement).  This  Agreement  and  the  Stock  Option
Agreement  have been duly executed and  delivered by each of the VTEL  Companies
and,  assuming  the due  authorization,  execution  and  delivery  hereof by the
Company,  constitute the legal, valid and binding obligation of each of the VTEL
Companies,  enforceable  against each of the VTEL  Companies in accordance  with
their terms.

         Section 4.05.     No Conflict: Required Filings and Consents.

                  (a)      Except as otherwise disclosed in Section 4.05(a) of
         the VTEL Disclosure Schedule, the execution and delivery of this
         Agreement and the Stock Option Agreement

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<PAGE>



         by each of the VTEL  Companies  which are parties  thereto do not,  and
         performance  by  each  of  them  of  their  obligations  hereunder  and
         thereunder, including the consummation of the transactions contemplated
         hereby  and  thereby,  will  not  (i)  conflict  with  or  violate  the
         Certificate   of   Incorporation   or   Bylaws,   or   the   equivalent
         organizational  documents, in each case as amended or restated, of VTEL
         or any of  VTEL's  Significant  Subsidiaries,  (ii)  conflict  with  or
         violate  any Laws in  effect  as of the date of this  Agreement  or any
         judgment,  order or decree to which VTEL or any of VTEL's  subsidiaries
         is a party  or by or to  which  any of their  properties  are  bound or
         subject or (iii) result in any breach of or constitute a default (or an
         event that with or without notice or lapse of time or both would become
         a default) under,  or impair any of VTEL's or any of its  Subsidiaries'
         rights or alter the rights or obligations of any third party under,  or
         give to others any rights of  termination,  amendment,  acceleration or
         cancellation of, or require payment under, or result in the creation of
         a lien or encumbrance on any of the properties or assets of VTEL or any
         of  VTEL's  subsidiaries   pursuant  to,  any  note,  bond,   mortgage,
         indenture,  contract agreement,  lease, license,  permit,  franchise or
         other  instrument  or  obligation  to  which  VTEL  or  any  of  VTEL's
         subsidiaries  is a  party  or by or to  which  VTEL  or any  of  VTEL's
         subsidiaries or any of their respective  properties is bound or subject
         (including,  but not  limited to, any  license  agreement,  contract or
         other arrangement of any nature relating to VTEL Intellectual  Property
         Rights or VTEL Third Party Intellectual Property Rights (as these terms
         are hereinafter defined), excluding from the foregoing clauses (ii) and
         (iii)  any such  conflicts,  violations,  breaches,  defaults,  events,
         rights of termination, amendment, acceleration or cancellation, payment
         obligations  or liens or  encumbrances  that  could not  reasonably  be
         expected to have a VTEL Material Adverse Effect.

                  (b) The execution and delivery of this Agreement and the Stock
         Option  Agreement  by each of the  VTEL  Companies  which  are  parties
         thereto does not, and the  performance by each of the VTEL Companies of
         its  respective   obligations   hereunder  and  thereunder,   including
         consummation of the transactions  contemplated hereby and thereby, will
         not,  require  either  of the VTEL  Companies  to  obtain  any  consent
         license,  permit,  waiver,  approval,  authorization or order of, or to
         make any  filing  with or  notification  to, any  Governmental  Entity,
         except (i) for (A) applicable  requirements,  if any, of the Securities
         Act,  the  Exchange  Act,  and Blue Sky  Laws,  and (B) the  pre-merger
         notification   requirements  of  the  HSR  Act,  (ii)  the  filing  and
         recordation  of appropriate  merger  documents as required by the DGCL,
         and (iii) where the failure to obtain such consents, licenses, permits,
         waivers,  approvals,  authorizations or orders, or to make such filings
         or notifications could not individually or in the aggregate  reasonably
         be expected to cause a VTEL  Material  Adverse  Effect or to materially
         impair  or delay the  ability  of  either  of the VTEL  Companies  from
         performing  their respective  obligations  under this Agreement and the
         Stock Option Agreement.

         Section 4.06.     Permits; Compliance.  Except as disclosed in Section
         4.06 of the VTEL Disclosure Schedule, each of VTEL and its subsidiaries
         is in possession of all Permits necessary to own, lease and operate
         their properties and to carry on their businesses as they are now being

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<PAGE>



conducted  except where the failure to possess such Permits could not reasonably
be expected to have a VTEL  Material  Adverse  Effect.  Except as  disclosed  in
Section 4.06 of the VTEL Disclosure Schedule,  as of the date of this Agreement,
there  are  no  actions,  proceedings,  or  investigations  pending  or,  to the
knowledge of VTEL, threatened against VTEL or any of its subsidiaries that could
reasonably  be  expected  to  result  in the  loss,  revocation,  suspension  or
cancellation  of a Permit held by VTEL or a subsidiary  of VTEL,  except for any
suspension,  loss or revocation  that could not reasonably be expected to have a
VTEL Material  Adverse  Effect.  Except as disclosed in Section 4.06 of the VTEL
Disclosure  Schedule,  neither VTEL nor any of its  subsidiaries  is in conflict
with, or in default under or violation of, nor has it received,  since  December
31,  1993,  from any  Governmental  Entity any written  notice  with  respect to
possible conflicts with,  defaults under or violations of (a) any Law applicable
to VTEL or any of its  subsidiaries  or by or to which  any of their  respective
properties are bound or subject, (b) any judgment, order or decree applicable to
VTEL or any of its  subsidiaries or (c) any Permits held by VTEL or a subsidiary
of VTEL, except for any such conflicts, defaults or violations that individually
or in the  aggregate  could not  reasonably  be expected to have a VTEL Material
Adverse Effect.

         Section 4.07.     Reports: Financial Statements.

                  (a) Since December 31, 1993,  VTEL and its  subsidiaries  have
         filed all forms, reports, statements and other documents required to be
         filed  with the SEC,  including,  without  limitation,  (i) all  Annual
         Reports on Form 10-K,  (ii) all Quarterly  Reports on Form 10-Q,  (iii)
         all proxy  statements  relating to meetings  of  stockholders  (whether
         annual or  special),  (iv) all Current  Reports on Form 8-K and (v) all
         other reports,  schedules,  registration  statements or other documents
         (collectively  referred  to as the  "VTEL  SEC  Reports").  As of their
         respective  dates,  the  VTEL  SEC  Reports  complied  in all  material
         respects  with  the  requirements  of  applicable  Law  (including  the
         Securities  Act or the Exchange  Act, as the case may be, and the rules
         and  regulations  of the SEC  thereunder  applicable  to the  VTEL  SEC
         Reports) and the VTEL SEC Reports,  including,  without limitation, any
         financial statements or schedules included therein, did not at the time
         they were filed contain any untrue statement of a material fact or omit
         to state a material fact required to be stated  therein or necessary in
         order to make the statements therein, in the light of the circumstances
         under which they were made, not misleading.

                  (b)  VTEL  has   heretofore   delivered  to  the  Company  (i)
         consolidated balance sheets of VTEL and its subsidiaries as of December
         31,  1993,  December  31, 1994 and December 31, 1995 and as of July 31,
         1996 and (ii) consolidated  statements of income,  stockholders' equity
         and cash flows for each of the three years and seven  months then ended
         certified  by  Price  Waterhouse  LLP,  reports  thereon  are  included
         therewith.  VTEL has also  delivered  to the Company  (i) an  unaudited
         consolidated  balance sheet of VTEL and its  subsidiaries as of October
         31,  1996,  and  (ii)  unaudited  consolidated  statements  of  income,
         stockholders'  equity and cash flows for the three  months  then ended.
         Such audited and unaudited consolidated financial statements, including
         any such financial

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<PAGE>



         statements  and  schedules  contained  in  the  VTEL  SEC  reports  (or
         incorporated by reference therein) (i) are in accordance with the books
         and records of VTEL and its  subsidiaries in all material  respects and
         have  been  prepared  in  accordance   with  the  published  rules  and
         regulations  of the SEC and generally  accepted  accounting  principles
         applied on a consistent  basis  throughout the periods involved (except
         (A) to the extent disclosed therein or required by changes in generally
         accepted  accounting  principles,  (B)  with  respect  to the  VTEL SEC
         Reports filed prior to the date of this Agreement,  as may be indicated
         in the notes  thereto  and (C) in the case of the  unaudited  financial
         statements,  as permitted by the rules and  regulations of the SEC) and
         (ii) fairly present in all material respects the consolidated financial
         position  of  VTEL  and its  subsidiaries  as of the  respective  dates
         thereof and the  consolidated  results of operations and cash flows for
         the periods indicated  (except,  in the case of unaudited  consolidated
         financial  statements for interim periods, for the absence of footnotes
         and  subject  to  adjustments,  consisting  only of  normal,  recurring
         accruals,  necessary to present  fairly such results of operations  and
         cash flows).

                  (c) Except as and to the extent set forth on the  consolidated
         balance sheet of the VTEL and its subsidiaries as of December 31, 1995,
         including the notes  thereto,  or in the  Company's  Annual Report Form
         10-K for the  transition  period  ended  July 31,  1996,  or in  VTEL's
         Quarterly  Report on Form 10-Q for the quarter  ended October 31, 1996,
         neither  VTEL  or  any of  its  subsidiaries  has  any  liabilities  or
         obligations  material  to  VTEL  and  its  subsidiaries  which  are not
         referenced on such balance sheet or in such Annual Report on Form 10-K.
         Except as set forth in  Section  4.07 of the VTEL  Disclosure  Schedule
         since  the date of the  VTEL's  Transition  Report on Form 10-K for the
         seven month transition period ended July 31, 1996, neither VTEL nor its
         subsidiaries has incurred any liabilities except for (i) liabilities or
         obligations  incurred in the ordinary course of business and consistent
         with past practice,  (ii) liabilities incurred in connection with or as
         a result of the Merger and (iii)  liabilities or  obligations  which do
         not have a VTEL Material Adverse Effect.

         Section 4.08. Absence of Certain Changes or Events. Except as disclosed
in the VTEL SEC  Reports  filed  prior to the date of this  Agreement  or as set
forth in Section 4.08 of the VTEL Disclosure Schedule,  since December 31, 1995,
VTEL and its subsidiaries have conducted their respective businesses only in the
ordinary course and in a manner  consistent with past practice and there has not
been (a) any damage,  destruction  or loss with respect to any assets of VTEL or
any of its  subsidiaries  that,  whether  or not  covered  by  insurance,  would
constitute  a VTEL  Material  Adverse  Effect,  (b)  any  change  by VTEL or its
subsidiaries in their significant  accounting  policies or (c) any VTEL Material
Adverse Effect.

         Section  4.09.  Absence of  Litigation.  Except as set forth in Section
4.09  of  the  VTEL  Disclosure  Schedule,  there  is no  claim,  action,  suit,
litigation,  proceeding, arbitration or, to the knowledge of VTEL, investigation
of any kind,  at law or in equity  (including  actions  or  proceedings  seeking
injunctive  relief),  pending or, to the knowledge of VTEL,  threatened  against
VTEL or any of its  subsidiaries  or any  properties or rights of VTEL or any of
its subsidiaries, and

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<PAGE>



neither VTEL nor any of its  subsidiaries is subject to any continuing order of,
consent decree,  settlement  agreement or other similar written  agreement with,
or, to the  knowledge of VTEL,  continuing  investigation  by, any  Governmental
Entity,  or any  judgment,  order,  writ,  injunction,  decree  or  award of any
Governmental    Entity   or   arbitrator,    including,    without   limitation,
ceaseand-desist or other orders.

         Section 4.10.     Intellectual Rights.

                  (a) VTEL owns, or is licensed or otherwise  possesses  legally
         sufficient rights to use, all patents, trademarks, trade names, service
         marks, copyrights, maskworks and any applications therefor, technology,
         know-how,  video and audio  compression  algorithms,  computer software
         programs or applications (in both source code and object code form) and
         tangible or  intangible  proprietary  information  or material that are
         used  or  proposed  to be  used in the  business  of VTEL as  currently
         conducted.  Section  4.10 of the VTEL  Disclosure  Schedule  lists  all
         current  patents,  registered  and  material  unregistered  copyrights,
         maskworks, trade names and any applications therefor owned by VTEL (the
         "VTEL Intellectual  Property Rights"),  and specifies the jurisdictions
         in which  each such  Intellectual  Property  Right  has been  issued or
         registered   or  in  which  an   application   for  such  issuance  and
         registration has been filed,  including the respective  registration or
         application  numbers and the names of all  registered  owners.  Section
         4.10 of VTEL's Disclosure Schedule includes and specifically identifies
         all material third-party  patents,  trademarks,  copyrights  (including
         software) and maskworks  (the "VTEL Third Party  Intellectual  Property
         Rights"),  to the knowledge of VTEL, which are incorporated in, are, or
         form a part  of,  any VTEL  product,  excluding  any such  intellectual
         property  rights  that are  available  on a  commodity  basis  (such as
         "shrink wrap"  licenses) and which are  non-exclusive,  terminable  and
         available  for a  standard  fee.  Section  4.10 of the VTEL  Disclosure
         Schedule  lists  (i)  all  material  licenses,  sublicenses  and  other
         agreements as to which VTEL is a party and pursuant to which any person
         is  authorized to use any VTEL  Intellectual  Property  Rights,  or any
         trade secret material to VTEL or any of its subsidiaries;  and (ii) all
         material licenses, sublicenses and other agreements as to which VTEL is
         a party and pursuant to which VTEL is  authorized to use any VTEL Third
         Party  Intellectual  Property Rights,  or other trade secret of a third
         party in or as any  product,  and  includes the identity of all parties
         thereto, a description of the nature and subject matter thereof and the
         term thereof.

                  (b) VTEL is not,  nor will it be as a result of the  execution
         and delivery of this Agreement or the  performance  of its  obligations
         hereunder,  in  violation  of  any  license,  sublicense  or  agreement
         described in Section 4.10(a) of the VTEL Disclosure Schedule. No claims
         with respect to VTEL  Intellectual  Property  Rights,  any trade secret
         material to VTEL, or VTEL Third Party  Intellectual  Property Rights to
         the extent arising out of any use, reproduction or distribution of such
         VTEL Third Party  Intellectual  Property Rights by or through VTEL, are
         currently  pending or, to the knowledge of VTEL,  are threatened by any
         person,  nor does  VTEL  know of any  valid  grounds  for any bona fide
         claims (i) to

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         the effect that the manufacture,  sale, licensing or use of any product
         as now used,  sold or licensed or proposed for use,  sale or license by
         VTEL infringes on any copyright,  maskwork, patent, trademark,  service
         mark or trade secret;  (ii) against the use by VTEL of any  trademarks,
         trade names, trade secrets, copyrights, maskworks, patents, technology,
         know-how, video and audio compression algorithms,  or computer software
         programs  and  applications   used  in  VTEL's  business  as  currently
         conducted or as proposed to be conducted by VTEL; (iii) challenging the
         ownership,  validity or effectiveness of any VTEL Intellectual Property
         Rights or other  trade  secret  material to VTEL;  or (iv)  challenging
         VTEL's  license or legally  enforceable  right to use of the VTEL Third
         Party Intellectual  Rights. To VTEL's knowledge,  all material patents,
         registered trademarks,  maskworks and copyrights held by VTEL are valid
         and subsisting. To VTEL's knowledge,  there is no material unauthorized
         use, infringement or misappropriation of any VTEL Intellectual Property
         by any third party,  including any employee or former  employee of VTEL
         or any of the its subsidiaries.  Except as set forth in Section 4.10(b)
         of  the  VTEL  Disclosure  Schedule,   neither  VTEL  nor  any  of  its
         subsidiaries  (i) has been sued or charged in writing as a defendant in
         any  claim,  suit,  action  or  proceeding  which  involves  a claim or
         infringement of trade secrets, any patents, trademarks,  service marks,
         maskworks or copyrights and which has not been finally terminated prior
         to the date hereof or been informed or notified by any third party that
         VTEL may be engaged in such  infringement  or (ii) has knowledge of any
         infringement liability with respect to, or infringement by, VTEL or any
         of its  subsidiaries of any trade secret,  patent,  trademark,  service
         mark, maskwork or copyright of another.

                  (c) Each  employee  of VTEL has  executed  a  confidentiality,
         invention and  copyright  agreement  with VTEL in the forms  previously
         made available to the Company.

         Section 4.11. Transactions with Management.  Except as disclosed in the
VTEL SEC Reports,  no executive officer,  director or stockholder of VTEL or any
of its  subsidiaries  has,  since  December  31,  1994,  engaged in any business
dealings with the Company or any of its  subsidiaries,  other than such business
dealings as would not be required to be disclosed  in such  documents or reports
pursuant  to the  Securities  Act  and the  rules  and  regulations  promulgated
thereunder.

         Section 4.12. Vote Required. The only votes of the holders of any class
or series of VTEL  capital  stock  necessary  to  approve  the  Merger  and this
Agreement are the  affirmative  votes of the holders of not less than a majority
of the outstanding shares of VTEL Common Stock.

         Section 4.13.     Brokers.   No broker, finder or investment banker
(other than Bear, Stearns & Co. Inc.) is entitled to any brokerage,  finder's or
other fee or commission in connection with the transactions contemplated by this
Agreement based upon arrangements made by or on behalf of VTEL.

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                                                        31

<PAGE>



         Section 4.14.     Opinion of Financial Advisor.  VTEL has received the
written  opinion of Bear,  Stearns & Co. Inc. to the effect that, as of the date
of this Agreement,  the Merger  Consideration to be paid by VTEL is fair, from a
financial point of view, to the holders of VTEL Common Stock. VTEL will promptly
deliver a copy of such opinion to the Company.

         Section  4.15.  Board  Recommendations.  By a  unanimous  vote  of  the
directors  present at a meeting of VTEL's Board of Directors  (which meeting was
duly called and held and at which a quorum was present at all times),  the Board
of  Directors of VTEL (a)  approved  and adopted  this  Agreement  and the other
transactions  contemplated herein, and determined that the Merger is fair to the
stockholders  of VTEL,  and (b) resolved to  recommend  approval and adoption of
this  Agreement,  including the Merger and the other  transactions  contemplated
herein, by the stockholde