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Change in Control Agreement - VTEL Corp. and Brian C. Sullivan

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February 15, 2000

Mr. Brian C. Sullivan
Senior Director, Human Resources
VTEL Corporation
108 Wild Basin Road

Austin, TX 78746

Dear Brian,

VTEL Corporation (the "Company") considers it essential to the best interests of
its  stockholders  to  foster  the  continuous   employment  of  key  management
personnel.  In this  connection,  should the Company  receive a proposal  from a
third  party,  whether  solicited  by the Company or  unsolicited,  concerning a
possible business combination with, or the acquisition of a substantial share of
the equity or voting  securities of, the Company,  the Board of Directors of the
Company  (the  "Board") has  determined  that it is  imperative  that it and the
Company be able to rely upon your continued  services  without  concern that you
might be distracted by the personal uncertainties and risks that such a proposal
might otherwise entail.  Accordingly,  the Board has determined that appropriate
steps should be taken to reinforce and  encourage  the  continued  attention and
dedication of members of the Company's management,  including yourself, to their
assigned  duties  without  distraction  in the  face of  potentially  disturbing
circumstances  that could arise out of a proposal for a change in control of the
Company.  The Board has also  determined  that it is in the best interest of the
Company  and its  stockholders  to ensure  your  continued  availability  to the
Company and its subsidiaries in the event of a "potential change in control" (as
defined in Section 2 hereof).  In order to induce you to remain in the employ of
the Company and its  subsidiaries  and in  consideration  of your  agreement set
forth in Section  2(ii)  hereof,  the Company  agrees that you shall receive the
severance benefits set forth in this letter agreement ("Agreement") in the event
your employment with the Company and its  subsidiaries is terminated  subsequent
to a Change in Control (as defined in Section 2 hereof) under the  circumstances
described below.



<PAGE>

1. Term of Agreement. This Agreement shall commence on the date hereof and shall
continue in effect through December 31, 2000; provided, however, that commencing
on January 1, 2001 and each  January 1  thereafter,  the term of this  agreement
shall  automatically be extended for one additional year unless,  not later than
September 30 of the preceding  year, the Company shall have given notice that it
does not wish to extend this Agreement; provided, further, that, notwithstanding
any such notice by the Company not to extend,  if a Change in Control shall have
occurred during the original or extended term of this Agreement,  this Agreement
shall  continue in effect for a period of  twenty-four  (24)  months  beyond the
expiration of the term in effect immediately before such Change in Control.

2. Change in Control.  (i) No benefits shall be payable  hereunder  unless there
shall have been a Change in  Control of the  Company,  as set forth  below.  For
purposes of this  Agreement,  a "Change in Control" of the Company  shall mean a
change in control of a nature  that would be required to be reported in response
to Item 6(e) of Schedule 14A of Regulation 14A promulgated  under the Securities
Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  whether or not the
Company is then subject to such reporting  requirement;  provided that,  without
limitation, such a Change in Control shall be deemed to have occurred if (A) any
"person" (as such term is used in Sections  13(d) and 14(d) of the Exchange Act)
is or  becomes  the  "beneficial  owner" (as  defined  in Rule  13d-3  under the
Exchange Act), directly or indirectly, of securities of the Company representing
40% or more of the  combined  voting  power of the  Company's  then  outstanding
securities; or (B) during any period of two consecutive years (not including any
period  prior  to the  execution  of  this  Agreement),  individuals  who at the
beginning  of such  period  constitute  the  Board and any new  director,  whose
election to the Board or  nomination  for election to the Board by the Company's
stockholders  was  approved  by a  vote  of at  least  two-thirds  (2/3)  of the
directors then still in office who either were directors at the beginning of the
period or whose  election or nomination for election was previously so approved,
cease for any reason to constitute a majority of the Board; (C) the stockholders
of the Company approve a merger or  consolidation  of the Company with any other
corporation,  other than a merger or  consolidation  which  would  result in the
voting  securities  of  the  Company   outstanding   immediately  prior  thereto
continuing to represent  (either by remaining  outstanding or by being converted
into voting  securities of the  surviving  entity) more than 60% of the combined
voting power of the voting  securities of the Company or such  surviving  entity
outstanding immediately after such merger or consolidation, except that a merger
or  consolidation  effected to implement a  recapitalization  of the Company (or
similar transaction) in which no "person" (as hereinabove defined) acquires more
than  40%  of the  combined  voting  power  of the  Company's  then  outstanding
securities  shall not constitute a change in control of the Company;  or (D) the
stockholders  of the  Company  approve  a plan of  complete  liquidation  of the
Company or an  agreement  for the sale or  disposition  by the Company of all or
substantially all of the Company's assets.


<PAGE>

(ii) For  purposes  of this  Agreement,  a  "potential  change in control of the
Company"  shall be deemed to have  occurred  if (A) the  Company  enters into an
agreement,  the consummation of which would result in the occurrence of a Change
in  Control;  (B) any person  (including  the  Company)  publicly  announces  an
intention  to take or to consider  taking  actions  which if  consummated  would
constitute a Change in Control;  (C) any person  becomes the  beneficial  owner,
directly or indirectly,  of securities of the Company representing 25.0% or more
of the combined voting power of the Company's then  outstanding  securities;  or
(D) the Board  adopts a  resolution  to the effect  that,  for  purposes of this
Agreement,  a potential change in control of the Company has occurred. You agree
that,  subject to the terms and conditions of this Agreement,  in the event of a
potential change in control of the Company occurring after the date hereof,  you
will  not  voluntarily  terminate  your  employment  with  the  Company  and its
subsidiaries  for a  period  of nine (9)  months  from  the  occurrence  of such
potential change in control of the Company. If more than one potential change in
control occurs during the term of this Agreement, the provision of the preceding
sentence shall be applicable to each potential change in control occurring prior
to the occurrence of a Change in Control.

3. Termination  Following  Change in Control.  If any of the events described in
Section 2(i) hereof  constituting a Change in Control shall have  occurred,  you
shall be entitled to the  benefits  provided  in Section  4(iv)  hereof upon the
subsequent  termination of your employment with the Company and its subsidiaries
during the term of this Agreement unless such termination is

     (A) because of your death or  Retirement,  (B) by the Company or any of its
         subsidiaries  for Disability or Cause or (C) by you other than for Good
         Reason.

(i) Disability;  Retirement. For purposes of this Agreement,  "Disability" shall
mean  permanent  and total  disability  as such term is  defined  under  Section
22(e)(3) of the Internal  Revenue Code of 1986,  as amended  (the  "Code").  Any
question as to the existence of your  Disability  upon which you and the Company
cannot agree shall be determined by a qualified  independent  physician selected
by you (or, if you are unable to make such  selection,  such selection  shall be
made by any adult member of your immediate family), and approved by the Company.
The  determination  of such  physician made in writing to the Company and to you
shall be final and conclusive for all purposes of this  Agreement.  For purposes
of this  Agreement,  "Retirement"  shall  mean  your  voluntary  termination  of
employment with the Company in accordance with the Company's  retirement  policy
(excluding early retirement)  generally  applicable to its salaried employees or
in accordance with any retirement arrangement established with your consent with
respect to you.

<PAGE>

(ii) Cause.  For  purposes of this  Agreement,  "Cause"  shall mean your willful
breach of duty in the course of your  employment,  or your  habitual  neglect of
your  employment  duties or your  continued  incapacity  to  perform  them.  For
purposes of this Section 3(ii), no act, or failure to act, on your part shall be
deemed "willful" unless done, or omitted to be done by you not in good faith and
without  reasonable belief that your action or omission was in the best interest
of the Company and its subsidiaries.  Notwithstanding  the foregoing,  you shall
not be deemed to have been  terminated  for Cause  unless and until  there shall
have  been  delivered  to  you a  copy  of a  resolution  duly  adopted  by  the
affirmative vote of not less than three-quarters  (3/4) of the entire membership
of the Board at a meeting of the Board called and held for such  purpose  (after
reasonable notice to you and an opportunity for you, together with your counsel,
to be heard  before the Board),  finding  that in the good faith  opinion of the
Board you were  guilty of  conduct  set forth  above in this  Section  3(ii) and
specifying the particulars thereof in detail.

(iii) Good Reason.  You shall be entitled to terminate your  employment for Good
Reason.  For the  purpose  of this  Agreement,  "Good  Reason"  shall  mean  the
occurrence,  without  your  express  written  consent,  of any of the  following
circumstances  unless, in the case of paragraphs (A), (E), (F), (G), or (H) such
circumstances  are fully  corrected prior to the Date of Termination (as defined
in Section 3(v))  specified in the Notice of Termination  (as defined in Section
3(iv)) given in respect thereof:

(A) a substantial  diminution  in the nature or status of your  responsibilities
from those in effect immediately prior to the Change in Control,


(B) a reduction  by the Company or any of its  subsidiaries  in your annual base
salary as in effect on the date hereof or as the same may be increased from time
to time;

(C) a  requirement  from the  Company or any of its  subsidiaries  for you to be
based anywhere  outside a radius of 50 miles from the executive  office in which
you are located prior to the Change in Control except for required travel on the
business  of  the  Company  and  its  subsidiaries  to an  extent  substantially
consistent with your present business travel obligations;

<PAGE>

(D) the failure by the Company to pay to you any  portion of an  installment  of
deferred  compensation  under any deferred  compensation  program of the Company
within seven (7) days of the date such compensation is due;

(E) the failure by the Company or any of its  subsidiaries to continue in effect
any compensation  plan in which you participate  prior to the Change in Control,
unless  an  equitable   arrangement   (embodied  in  an  ongoing  substitute  or
alternative  plan) has been made in such plan in  connection  with the Change in
Control,  or the failure by the Company or any of its  subsidiaries  to continue
your  participation  therein on the same  basis,  both in terms of the amount of
benefits  provided  and  the  level  of your  participation  relative  to  other
participants, as existed at the time of the Change in Control;

(F) the failure by the Company or any of its subsidiaries to continue to provide
you with  benefits  at least as  favorable  to those  enjoyed  by you  under the
employee  benefit  and  welfare  plans  of the  Company  and  its  subsidiaries,
including, without limitation, the pension, life insurance,  medical, health and
accident, disability,  deferred compensation and savings plans in which you were
participating at the time of the Change in Control,  the taking of any action by
the  Company or any of its  subsidiaries  which  would  directly  or  indirectly
materially  reduce any of such  benefits or deprive you of any  material  fringe
benefit  enjoyed by you at the time of the Change in Control,  or the failure by
the  Company or any of its  subsidiaries  to provide you with the number of paid
vacation days to which you are entitled at the time of the Change in Control;

(G) the  failure of the  Company  to obtain a  satisfactory  agreement  from any
successor  to assume and agree to perform this  Agreement,  as  contemplated  in
Section 5 hereof;

(H) any purported  termination of your employment which is not effected pursuant
to a Notice of Termination  satisfying the  requirements  of Section 3(iv) below
(and, if applicable,  the requirements of Section 3(ii) above);  for purposes of
this Agreement, no such purported termination shall be effective. Your continued
employment  shall not constitute  consent to, or a waiver of rights with respect
to, any circumstance  constituting Good Reason hereunder. A Change in Control of
the Company shall not, by itself, constitute Good Reason.

(iv) Notice of Termination.  Any purported termination of your employment by the
Company and its  subsidiaries  or by you shall be communicated by written Notice
of  Termination  to the other party hereto in accordance  with Section 6 hereof.
For purposes of this Agreement,  a "Notice of  Termination"  shall mean a notice
which shall indicate the specific termination provision in this Agreement relied
upon and shall  set  forth in  reasonable  detail  the  facts and  circumstances
claimed  to  provide  a basis  for  termination  of your  employment  under  the
provision so indicated.

<PAGE>

(v) Date of  Termination,  Etc.  "Date of  Termination"  shall  mean (A) if your
employment  is  terminated  for  Disability,  thirty  (30) days after  Notice of
Termination is given (provided that you shall not have returned to the full-time
performance of your duties during such thirty (30) day period),  and (B) if your
employment  is  terminated  pursuant to Section  3(ii) or (iii) above or for any
other  reason  (other  than  Disability),  the date  specified  in the Notice of
Termination (which, in the case of a termination pursuant to Section 3(ii) above
shall  not be less  than  thirty  (30)  days,  and in the case of a  termination
pursuant  to Section  3(iii)  above  shall not be less than thirty (30) nor more
than sixty (60) days, respectively,  from the date such Notice of Termination is
given);  provided  that,  if  within  thirty  (30)  days  after  any  Notice  of
Termination is given the party receiving such Notice of Termination notifies the
other party that a dispute exists  concerning the grounds for  termination,  the
Date  of  Termination  shall  be the  date  on  which  the  dispute  is  finally
determined,  either by mutual  written  agreement of the  parties,  by a binding
arbitration  award  or by a final  judgment,  order  or  decree  of a  court  of
competent jurisdiction (which is not appealable or the time for appeal therefrom
having expired and no appeal having been  perfected);  provided further that the
Date of Termination shall be extended by a notice of dispute only if such notice
is given in good faith and the party giving such notice  pursues the  resolution
of such dispute with reasonable diligence.

Notwithstanding  the  pendency  of  any  such  dispute,   the  Company  and  its
subsidiaries  will continue to pay you your full compensation in effect when the
notice giving rise to the dispute was given (including, but not limited to, base
salary) and  continue  you as a  participant  in all  compensation,  benefit and
insurance plans in which you were  participating  when the notice giving rise to
the dispute was given,  until the dispute is finally resolved in accordance with
this Section  3(v).  Amounts paid under this Section 3(v) are in addition to all
other amounts due under this Agreement and shall not be offset against or reduce
any other amounts due under this Agreement.

4.  Compensation  Upon Termination or During  Disability.  Following a Change in
Control of the Company,  as defined by Section 2(i),  upon  termination  of your
employment  or  during a period  of  Disability  you  shall be  entitled  to the
following  benefits,  provided  that  such  period  of  Disability  or  Date  of
Termination occurs during the term of this Agreement;

(i) During any period that you fail to perform  your  full-time  duties with the
Company and its subsidiaries as a result of your Disability,  you shall continue
to  receive  an amount  equal to your  base  salary at the rate in effect at the
commencement  of any such period through the Date of Termination for Disability,
together  with all  amounts  payable to you under the  disability  plans  and/or
policies of the Company and its subsidiaries. Thereafter, your benefits shall be
determined  in  accordance  with the  insurance  programs of the Company and its
subsidiaries then in effect.

<PAGE>

(ii) If  your  employment  shall  be  terminated  by the  Company  or any of its
subsidiaries for Cause or by you other than for Good Reason, the Company (or one
of its subsidiaries,  if applicable) shall pay you your full base salary through
the Date of  Termination at the rate in effect at the time Notice of Termination
is given and  shall  pay any  amounts  to be paid to you  pursuant  to any other
compensation  plans,  programs or employment  agreements then in effect, and the
Company shall have no further obligations to you under this Agreement.

(iii)  If your  employment  shall  be  terminated  by  reason  of your  death or
Retirement,  your benefits shall be determined in accordance with the retirement
and the insurance programs of the Company and its subsidiaries then in effect.

(iv) If your employment by the Company and its subsidiaries  shall be terminated
by (a) the  Company  and its  subsidiaries  other  than for Cause,  your  death,
Retirement,  or  Disability  or (b) by you for Good  Reason,  then you  shall be
entitled to the benefits provided below:

(A) The Company (or one of its  subsidiaries,  if applicable) shall pay you your
full base salary  through the Date of  Termination  at the rate in effect at the
time the Notice of Termination  is given,  no later than the fifth day following
the Date of Termination,  plus all other amounts to which you are entitled under
any  compensation  plan of the  Company  applicable  to you,  at the  time  such
payments are due;

(B) The  Company  shall pay as  severance  pay to you a severance  payment  (the
"Unadjusted  Severance  Payment")  equal to 1.0 times your "Base Amount" as such
term is defined under section  280G(b)(3) of the Code. Your Base Amount shall be
determined in accordance with temporary or final  regulations  promulgated under
section 280G of the Code in effect,  if any. In the absence of such regulations,
if you were not employed by the Company (or any corporation  affiliated with the
Company (an  "Affiliate")  within the  meaning of section  1504 of the Code or a
predecessor  of the Company)  during the entire five  calendar  years (the "Base
Period") preceding the calendar year in which a change in control of the Company
occurred,   your  average   annual   compensation   for  the  purposes  of  such
determination shall be the lesser of (1) the average of your annual compensation
for the complete  calendar years during the Base Period during which you were so
employed or (2) the average of your annual  compensation  for both  complete and
partial calendar years during the Base Period during which you were so employed,
determined by  annualizing  any  compensation  (other than  nonrecurring  items)

<PAGE>

includible in your gross income for any partial  calendar year or (3) the annual
average of your total  compensation for the Base Period during which you were so
employed,  determined by dividing such total compensation by the number of whole
and fractional years included in the Base Period. Compensation payable to you by
the Company or any Affiliate or  predecessor  of the Company shall include every
type and form of compensation includible in your gross income in respect of your
employment  by the  Company or any  Affiliate  or  predecessor  of the  Company,
including  compensation  income recognized as a result of your exercise of stock
options  or sale of the  stock  so  acquired,  except  to the  extent  otherwise
provided in temporary or final regulations promulgated under section 280G of the
Code.  For purposes of this  Section  4(iv) a "change in control of the Company"
shall have the meaning set forth in section  280G of the Code and any  temporary
or final regulations promulgated thereunder.

(C) The  Company  shall  accelerate  vesting  of  options,  both  qualified  and
non-qualified, based on the number of years of continuous employment at the time
of termination.  Vesting of outstanding options will be accelerated 3 months for
each year of employment at the Company. Compensation income recognized by you as
a result of your exercise of such stock options or sale of the stock so acquired
shall be included in deriving the limitations set forth in Section 4(iv)(D),  if
such benefits,  in the opinion of tax counsel  referred to in Section  4(iv)(D),
constitute "parachute payments" within the meaning of section 280G of the Code.

(D) The Unadjusted  Severance  Payment shall not be reduced by the amount of any
other  payment or the value of any benefit  received or to be received by you in
connection  with your  termination of employment or contingent  upon a change in
control of the Company  (whether payable pursuant to the terms of this Agreement
or any other  agreement,  plan or arrangement  with the Company or an Affiliate,
predecessor  or successor of the Company or any person whose actions result in a
change in control of the Company or an Affiliate  of such person)  unless (1) in
the opinion of tax counsel  selected by the Company's  independent  auditors and
reasonably  acceptable  to you,  such other  payment or  benefit  constitutes  a
"parachute  payment"  within the meaning of section 280G(b) (2) of the Code, and
(2) in the opinion of such tax counsel,  the Unadjusted  Severance  Payment plus
all other payments or benefits which constitute  "parachute payments" within the
meaning of  section  280G(b)  (2) of the Code  would  result in a portion of the
Unadjusted  Severance Payment being subject to the excise tax under section 4999
of the Code. In such event, the amount of the Unadjusted Severance Payment shall
be reduced by the minimum amount  necessary such that no portion thereof will be
subject  to the  excise  tax  under  section  4999 of the Code.  The  Unadjusted
Severance  Payment,  as reduced,  if at all,  pursuant to the provisions of this
paragraph shall be referred to as the Adjusted Severance Payment. In determining
whether the Unadjusted  Severance Payment shall be reduced under this paragraph,
(i) there shall not be included in the computation any payment if you shall have

<PAGE>

effectively  waived your receipt or  enjoyment  of such payment or benefit,  and
(ii) the value of any  non-cash  benefit or any deferred  cash payment  shall be
determined  by  the  Company's  independent  auditors  in  accordance  with  the
principles of sections 280G(d) (3) and (4) of the Code.

(E) Except to the extent  that the  payment  thereof  would  subject any payment
hereunder to the excise tax under section 4999 of the Code:

(1) The Company  shall also pay to you all legal fees and  expenses  incurred by
you as a result of such  termination  (including all such fees and expenses,  if
any,  incurred in contesting or disputing any such  termination or in seeking to
obtain or enforce any right or benefit provided by this Agreement); and

(2) For a twelve (12) month period after  termination  of your  employment,  the
Company shall arrange,  at your expense,  to provide you with life,  disability,
accident and health insurance benefits  substantially similar to those which you
are  receiving  or  entitled  to  receive  immediately  prior to the  Notice  of
Termination.  Benefits  otherwise  receivable  by you pursuant to this Section 4
(iv) (D) (2) shall be reduced to the extent  comparable  benefits  are  actually
received  by you  during  the  twenty-four  (24)  month  period  following  your
termination, and any such benefits actually received by you shall be reported to
the Company.

(F) If it is  established  pursuant  to a final  determination  of a court or an
Internal Revenue Service proceeding that,  notwithstanding the good faith of you
and the  Company in applying  the terms of this  Section 4 (iv),  the  aggregate
"parachute  payments"  paid to or for your  benefit  are in an amount that would
result in any portion of such  "parachute  payments" being subject to the excise
tax under section 4999 of the Code, then you shall have an obligation to pay the
Company  upon  demand  an  amount  equal  to the  sum of (1) the  excess  of the
aggregate  "parachute  payments"  paid to or for your benefit over the aggregate
"parachute  payments"  that would have been paid to or for your benefit  without
any portion of such  "parachute  payments" being subject to the excise tax under
section 4999 of the Code; and (2) interest on the amount set forth in clause (1)
of this sentence at the applicable  Federal rate (as defined in section  1274(d)
of the Code) from the date of your receipt of such excess until the date of such
payment.

(G) You shall not be required to mitigate the amount of any payment provided for
in this Section 4 by seeking other employment or otherwise, nor shall the amount
of any  payment  or  benefit  provided  for in this  Section 4 be reduced by any
compensation earned by you as the result of employment by another employer or by
retirement  benefits  after  the Date of  Termination,  or  otherwise  except as
specifically provided in this Section 4.

<PAGE>

(H) The Company shall pay you the Unadjusted  Severance Payment in a lump sum no
later than the fifth day following the Date of Termination;  provided,  however,
that if the Company in good faith believes that the Unadjusted Severance Payment
shall be reduced under the provisions of Section 4 (iv)(C)  hereof,  the Company
shall pay to you at such time a good faith  estimate of the  Adjusted  Severance
Payment (the "Estimated  Adjusted Severance  Payment",  the computation of which
shall be given to you in  writing  together  with a written  explanation  of the
basis for making such  adjustment)  which  amount shall in no event be less than
50% of the Unadjusted  Severance Payment.  The Company shall,  within 60 days of
the  Date of  Termination,  either  pay to you  the  balance  of the  Unadjusted
Severance Payment together with interest thereon at the applicable  Federal rate
(as  defined  in  section  1274(d)  of the Code) or deliver to you a copy of the
opinion of the tax counsel referred to in Section  4(iv)(C) hereof  establishing
the amount of the Adjusted Severance Payment.  If the Adjusted Severance Payment
exceeds the Estimated Adjusted  Severance Payment,  the difference shall be paid
to you at such time  together with interest  thereon at the  applicable  Federal
rate (as defined in section 1274(d) of the Code).

5. Successors; Binding Agreement.


(i) The Company  will require any  successor  (whether  direct or  indirect,  by
purchase, merger, consolidation or otherwise) to all or substantially all of the
business  and/or assets of the Company to expressly  assume and agree to perform
this  Agreement in the same manner and to the same extent that the Company would
be required to perform it if no such succession had taken place.  Failure of the
Company to obtain such  assumption and agreement prior to the  effectiveness  of
any such succession shall be a breach of this Agreement and shall entitle you to
compensation  from the  Company in the same  amount and on the same terms as you
would be entitled  hereunder  if you had  terminated  your  employment  for Good
Reason  following a Change in Control,  except that for purposes of implementing
the foregoing,  the date on which any such succession becomes effective shall be
deemed the Date of Termination. As used in this Agreement,  "Company" shall mean
the Company as  hereinbefore  defined  and any such  successor  to its  business
and/or assets as aforesaid which assumes and agrees to perform this Agreement by
operation of law, or otherwise.  (ii) This Agreement  shall inure to the benefit
of and be  enforceable  by your  personal or legal  representatives,  executors,
administrators,  successors, heirs, distributees,  devisees and legatees. If you
should die while any amount  would still be payable to you  hereunder if you had
continued to live, all such amounts,  unless otherwise provided herein, shall be
paid in accordance with the terms of this Agreement to your devisee,  legatee or
other designee or, if there is no such designee, to your estate.

6.  Notice.   For  the  purpose  of  this  Agreement,   notices  and  all  other
communications  provided for in the  Agreement  shall be in writing and shall be
deemed  to have been  duly  given  when  delivered  or  mailed by United  States
registered mail,  return receipt  requested,  postage prepaid,  addressed to the
respective  addresses  set forth on the first page of this  Agreement,  provided
that all notices to the Company  shall be directed to the attention of the Chief
Executive Officer with a copy to the Chief Financial  Officer,  or to such other
address as either party may have furnished to the other in writing in accordance
herewith,  except that notice of change of address shall be effective  only upon
receipt.

7.  Miscellaneous.  No provision of this  Agreement  may be modified,  waived or
discharged unless such waiver, modification or discharge is agreed to in writing
and signed by you and such  officer  as may be  specifically  designated  by the
Board.  No waiver by either  party hereto at any time of any breach by the other
party  hereto  of, or  compliance  with,  any  condition  or  provision  of this
Agreement  to be  performed  by such  other  party  shall be  deemed a waiver of
similar or  dissimilar  provisions  or conditions at the same or at any prior to
subsequent time. No agreements or representations, oral or otherwise, express or
implied,  with  respect to the  subject  matter  hereof have been made by either
party  which  are not  expressly  set  forth in this  Agreement.  The  validity,
interpretation, construction and performance of this Agreement shall be governed
by the laws of the State of Delaware. All references to sections of the Exchange
Act or the Code shall be deemed  also to refer to any  successor  provisions  to
such  sections.  Any payments  provided for  hereunder  shall be paid net of any
applicable   withholding  required  under  federal,  state  or  local  law.  The
obligations  of the Company under Section 4 shall survive the  expiration of the
term of this Agreement.

8.  Validity.  The  invalidity  or  unenforceability  of any  provision  of this
Agreement shall not affect the validity or enforceability of any other provision
of this Agreement, which shall remain in full force and effect.

9. Counterparts. This Agreement may be executed in several counterparts, each of
which  shall  be  deemed  to be an  original  but  all of  which  together  will
constitute one and the same instrument.

<PAGE>

10. Arbitration.  Any dispute or controversy arising under or in connection with
this Agreement  shall be settled  exclusively by arbitration in accordance  with
the rules of the American Arbitration  Association then in effect.  Judgment may
be entered on the arbitrator's award in any court having jurisdiction; provided,
however,  that you shall be entitled to seek specific  performance of your right
to be paid until the Date of  Termination  during the pendency of any dispute or
controversy arising under or in connection with this Agreement.

If this letter sets forth our  agreement on the subject  matter  hereof,  kindly
sign and return to the Company the enclosed  copy of this letter which will then
constitute our agreement on this subject.

Sincerely,



/s/ Dick Moeller
---------------------------
Dick Moeller
Chairman of the Board
VTEL Corporation

Agreed to this ____ day of ____________________, 2000.



/s/ Brian C. Sullivan
---------------------------
Brian C. Sullivan

<PAGE>

February 15, 2000

Mr. Stephen Cox

CIO and Vice-President, Information Services
VTEL Corporation
108 Wild Basin Road

Austin, TX 78746

Dear Stephen,

VTEL Corporation (the "Company") considers it essential to the best interests of
its  stockholders  to  foster  the  continuous   employment  of  key  management
personnel.  In this  connection,  should the Company  receive a proposal  from a
third  party,  whether  solicited  by the Company or  unsolicited,  concerning a
possible business combination with, or the acquisition of a substantial share of
the equity or voting  securities of, the Company,  the Board of Directors of the
Company  (the  "Board") has  determined  that it is  imperative  that it and the
Company be able to rely upon your continued  services  without  concern that you
might be distracted by the personal uncertainties and risks that such a proposal
might otherwise entail.  Accordingly,  the Board has determined that appropriate
steps should be taken to reinforce and  encourage  the  continued  attention and
dedication of members of the Company's management,  including yourself, to their
assigned  duties  without  distraction  in the  face of  potentially  disturbing
circumstances  that could arise out of a proposal for a change in control of the
Company.  The Board has also  determined  that it is in the best interest of the
Company  and its  stockholders  to ensure  your  continued  availability  to the
Company and its subsidiaries in the event of a "potential change in control" (as
defined in Section 2 hereof).  In order to induce you to remain in the employ of
the Company and its  subsidiaries  and in  consideration  of your  agreement set
forth in Section  2(ii)  hereof,  the Company  agrees that you shall receive the
severance benefits set forth in this letter agreement ("Agreement") in the event
your employment with the Company and its  subsidiaries is terminated  subsequent
to a Change in Control (as defined in Section 2 hereof) under the  circumstances
described below.

<PAGE>

1. Term of Agreement. This Agreement shall commence on the date hereof and shall
continue in effect through December 31, 2000; provided, however, that commencing
on January 1, 2001 and each  January 1  thereafter,  the term of this  agreement
shall  automatically be extended for one additional year unless,  not later than
September 30 of the preceding  year, the Company shall have given notice that it
does not wish to extend this Agreement; provided, further, that, notwithstanding
any such notice by the Company not to extend,  if a Change in Control shall have
occurred during the original or extended term of this Agreement,  this Agreement
shall  continue in effect for a period of  twenty-four  (24)  months  beyond the
expiration of the term in effect immediately before such Change in Control.

2. Change in Control.  (i) No benefits shall be payable  hereunder  unless there
shall have been a Change in  Control of the  Company,  as set forth  below.  For
purposes of this  Agreement,  a "Change in Control" of the Company  shall mean a
change in control of a nature  that would be required to be reported in response
to Item 6(e) of Schedule 14A of Regulation 14A promulgated  under the Securities
Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  whether or not the
Company is then subject to such reporting  requirement;  provided that,  without
limitation, such a Change in Control shall be deemed to have occurred if (A) any
"person" (as such term is used in Sections  13(d) and 14(d) of the Exchange Act)
is or  becomes  the  "beneficial  owner" (as  defined  in Rule  13d-3  under the
Exchange Act), directly or indirectly, of securities of the Company representing
40% or more of the  combined  voting  power of the  Company's  then  outstanding
securities; or (B) during any period of two consecutive years (not including any
period  prior  to the  execution  of  this  Agreement),  individuals  who at the
beginning  of such  period  constitute  the  Board and any new  director,  whose
election to the Board or  nomination  for election to the Board by the Company's
stockholders  was  approved  by a  vote  of at  least  two-thirds  (2/3)  of the
directors then still in office who either were directors at the beginning of the
period or whose  election or nomination for election was previously so approved,
cease for any reason to constitute a majority of the Board; (C) the stockholders
of the Company approve a merger or  consolidation  of the Company with any other
corporation,  other than a merger or  consolidation  which  would  result in the
voting  securities  of  the  Company   outstanding   immediately  prior  thereto
continuing to represent  (either by remaining  outstanding or by being converted
into voting  securities of the  surviving  entity) more than 60% of the combined
voting power of the voting  securities of the Company or such  surviving  entity
outstanding immediately after such merger or consolidation, except that a merger
or  consolidation  effected to implement a  recapitalization  of the Company (or
similar transaction) in which no "person" (as hereinabove defined) acquires more
than  40%  of the  combined  voting  power  of the  Company's  then  outstanding
securities  shall not constitute a change in control of the Company;  or (D) the
stockholders  of the  Company  approve  a plan of  complete  liquidation  of the
Company or an  agreement  for the sale or  disposition  by the Company of all or
substantially all of the Company's assets.

<PAGE>

(ii) For  purposes  of this  Agreement,  a  "potential  change in control of the
Company"  shall be deemed to have  occurred  if (A) the  Company  enters into an
agreement,  the consummation of which would result in the occurrence of a Change
in  Control;  (B) any person  (including  the  Company)  publicly  announces  an
intention  to take or to consider  taking  actions  which if  consummated  would
constitute a Change in Control;  (C) any person  becomes the  beneficial  owner,
directly or indirectly,  of securities of the Company representing 25.0% or more
of the combined voting power of the Company's then  outstanding  securities;  or
(D) the Board  adopts a  resolution  to the effect  that,  for  purposes of this
Agreement,  a potential change in control of the Company has occurred. You agree
that,  subject to the terms and conditions of this Agreement,  in the event of a
potential change in control of the Company occurring after the date hereof,  you
will  not  voluntarily  terminate  your  employment  with  the  Company  and its
subsidiaries  for a  period  of nine (9)  months  from  the  occurrence  of such
potential change in control of the Company. If more than one potential change in
control occurs during the term of this Agreement, the provision of the preceding
sentence shall be applicable to each potential change in control occurring prior
to the occurrence of a Change in Control.

3. Termination  Following  Change in Control.  If any of the events described in
Section 2(i) hereof  constituting a Change in Control shall have  occurred,  you
shall be entitled to the  benefits  provided  in Section  4(iv)  hereof upon the
subsequent  termination of your employment with the Company and its subsidiaries
during the term of this Agreement unless such termination is

     (A) because of your death or  Retirement,  (B) by the Company or any of its
         subsidiaries  for Disability or Cause or (C) by you other than for Good
         Reason.

(i) Disability;  Retirement. For purposes of this Agreement,  "Disability" shall
mean  permanent  and total  disability  as such term is  defined  under  Section
22(e)(3) of the Internal  Revenue Code of 1986,  as amended  (the  "Code").  Any
question as to the existence of your  Disability  upon which you and the Company
cannot agree shall be determined by a qualified  independent  physician selected
by you (or, if you are unable to make such  selection,  such selection  shall be
made by any adult member of your immediate family), and approved by the Company.
The  determination  of such  physician made in writing to the Company and to you
shall be final and conclusive for all purposes of this  Agreement.  For purposes
of this  Agreement,  "Retirement"  shall  mean  your  voluntary  termination  of
employment with the Company in accordance with the Company's  retirement  policy
(excluding early retirement)  generally  applicable to its salaried employees or
in accordance with any retirement arrangement established with your consent with
respect to you.

<PAGE>

(ii) Cause.  For  purposes of this  Agreement,  "Cause"  shall mean your willful
breach of duty in the course of your  employment,  or your  habitual  neglect of
your  employment  duties or your  continued  incapacity  to  perform  them.  For
purposes of this Section 3(ii), no act, or failure to act, on your part shall be
deemed "willful" unless done, or omitted to be done by you not in good faith and
without  reasonable belief that your action or omission was in the best interest
of the Company and its subsidiaries.  Notwithstanding  the foregoing,  you shall
not be deemed to have been  terminated  for Cause  unless and until  there shall
have  been  delivered  to  you a  copy  of a  resolution  duly  adopted  by  the
affirmative vote of not less than three-quarters  (3/4) of the entire membership
of the Board at a meeting of the Board called and held for such  purpose  (after
reasonable notice to you and an opportunity for you, together with your counsel,
to be heard  before the Board),  finding  that in the good faith  opinion of the
Board you were  guilty of  conduct  set forth  above in this  Section  3(ii) and
specifying the particulars thereof in detail.

(iii) Good Reason.  You shall be entitled to terminate your  employment for Good
Reason.  For the  purpose  of this  Agreement,  "Good  Reason"  shall  mean  the
occurrence,  without  your  express  written  consent,  of any of the  following
circumstances  unless, in the case of paragraphs (A), (E), (F), (G), or (H) such
circumstances  are fully  corrected prior to the Date of Termination (as defined
in Section 3(v))  specified in the Notice of Termination  (as defined in Section
3(iv)) given in respect thereof:

(A) a substantial  diminution  in the nature or status of your  responsibilities
from those in effect immediately prior to the Change in Control,


(B) a reduction  by the Company or any of its  subsidiaries  in your annual base
salary as in effect on the date hereof or as the same may be increased from time
to time;

(C) a  requirement  from the  Company or any of its  subsidiaries  for you to be
based anywhere  outside a radius of 50 miles from the executive  office in which
you are located prior to the Change in Control except for required travel on the
business  of  the  Company  and  its  subsidiaries  to an  extent  substantially
consistent with your present business travel obligations;

<PAGE>

(D) the failure by the Company to pay to you any  portion of an  installment  of
deferred  compensation  under any deferred  compensation  program of the Company
within seven (7) days of the date such compensation is due;

(E) the failure by the Company or any of its  subsidiaries to continue in effect
any compensation  plan in which you participate  prior to the Change in Control,
unless  an  equitable   arrangement   (embodied  in  an  ongoing  substitute  or
alternative  plan) has been made in such plan in  connection  with the Change in
Control,  or the failure by the Company or any of its  subsidiaries  to continue
your  participation  therein on the same  basis,  both in terms of the amount of
benefits  provided  and  the  level  of your  participation  relative  to  other
participants, as existed at the time of the Change in Control;

(F) the failure by the Company or any of its subsidiaries to continue to provide
you with  benefits  at least as  favorable  to those  enjoyed  by you  under the
employee  benefit  and  welfare  plans  of the  Company  and  its  subsidiaries,
including, without limitation, the pension, life insurance,  medical, health and
accident, disability,  deferred compensation and savings plans in which you were
participating at the time of the Change in Control,  the taking of any action by
the  Company or any of its  subsidiaries  which  would  directly  or  indirectly
materially  reduce any of such  benefits or deprive you of any  material  fringe
benefit  enjoyed by you at the time of the Change in Control,  or the failure by
the  Company or any of its  subsidiaries  to provide you with the number of paid
vacation days to which you are entitled at the time of the Change in Control;

(G) the  failure of the  Company  to obtain a  satisfactory  agreement  from any
successor  to assume and agree to perform this  Agreement,  as  contemplated  in
Section 5 hereof;

(H) any purported  termination of your employment which is not effected pursuant
to a Notice of Termination  satisfying the  requirements  of Section 3(iv) below
(and, if applicable,  the requirements of Section 3(ii) above);  for purposes of
this Agreement, no such purported termination shall be effective. Your continued
employment  shall not constitute  consent to, or a waiver of rights with respect
to, any circumstance  constituting Good Reason hereunder. A Change in Control of
the Company shall not, by itself, constitute Good Reason.

(iv) Notice of Termination.  Any purported termination of your employment by the
Company and its  subsidiaries  or by you shall be communicated by written Notice
of  Termination  to the other party hereto in accordance  with Section 6 hereof.
For purposes of this Agreement,  a "Notice of  Termination"  shall mean a notice
which shall indicate the specific termination provision in this Agreement relied
upon and shall  set  forth in  reasonable  detail  the  facts and  circumstances
claimed  to  provide  a basis  for  termination  of your  employment  under  the
provision so indicated.

<PAGE>

(v) Date of  Termination,  Etc.  "Date of  Termination"  shall  mean (A) if your
employment  is  terminated  for  Disability,  thirty  (30) days after  Notice of
Termination is given (provided that you shall not have returned to the full-time
performance of your duties during such thirty (30) day period),  and (B) if your
employment  is  terminated  pursuant to Section  3(ii) or (iii) above or for any
other  reason  (other  than  Disability),  the date  specified  in the Notice of
Termination (which, in the case of a termination pursuant to Section 3(ii) above
shall  not be less  than  thirty  (30)  days,  and in the case of a  termination
pursuant  to Section  3(iii)  above  shall not be less than thirty (30) nor more
than sixty (60) days, respectively,  from the date such Notice of Termination is
given);  provided  that,  if  within  thirty  (30)  days  after  any  Notice  of
Termination is given the party receiving such Notice of Termination notifies the
other party that a dispute exists  concerning the grounds for  termination,  the
Date  of  Termination  shall  be the  date  on  which  the  dispute  is  finally
determined,  either by mutual  written  agreement of the  parties,  by a binding
arbitration  award  or by a final  judgment,  order  or  decree  of a  court  of
competent jurisdiction (which is not appealable or the time for appeal therefrom
having expired and no appeal having been  perfected);  provided further that the
Date of Termination shall be extended by a notice of dispute only if such notice
is given in good faith and the party giving such notice  pursues the  resolution
of such dispute with reasonable diligence.

Notwithstanding  the  pendency  of  any  such  dispute,   the  Company  and  its
subsidiaries  will continue to pay you your full compensation in effect when the
notice giving rise to the dispute was given (including, but not limited to, base
salary) and  continue  you as a  participant  in all  compensation,  benefit and
insurance plans in which you were  participating  when the notice giving rise to
the dispute was given,  until the dispute is finally resolved in accordance with
this Section  3(v).  Amounts paid under this Section 3(v) are in addition to all
other amounts due under this Agreement and shall not be offset against or reduce
any other amounts due under this Agreement.

4.  Compensation  Upon Termination or During  Disability.  Following a Change in
Control of the Company,  as defined by Section 2(i),  upon  termination  of your
employment  or  during a period  of  Disability  you  shall be  entitled  to the
following  benefits,  provided  that  such  period  of  Disability  or  Date  of
Termination occurs during the term of this Agreement;

(i) During any period that you fail to perform  your  full-time  duties with the
Company and its subsidiaries as a result of your Disability,  you shall continue
to  receive  an amount  equal to your  base  salary at the rate in effect at the
commencement  of any such period through the Date of Termination for Disability,
together  with all  amounts  payable to you under the  disability  plans  and/or
policies of the Company and its subsidiaries. Thereafter, your benefits shall be
determined  in  accordance  with the  insurance  programs of the Company and its
subsidiaries then in effect.

<PAGE>

(ii) If  your  employment  shall  be  terminated  by the  Company  or any of its
subsidiaries for Cause or by you other than for Good Reason, the Company (or one
of its subsidiaries,  if applicable) shall pay you your full base salary through
the Date of  Termination at the rate in effect at the time Notice of Termination
is given and  shall  pay any  amounts  to be paid to you  pursuant  to any other
compensation  plans,  programs or employment  agreements then in effect, and the
Company shall have no further obligations to you under this Agreement.

(iii)  If your  employment  shall  be  terminated  by  reason  of your  death or
Retirement,  your benefits shall be determined in accordance with the retirement
and the insurance programs of the Company and its subsidiaries then in effect.

(iv) If your employment by the Company and its subsidiaries  shall be terminated
by (a) the  Company  and its  subsidiaries  other  than for Cause,  your  death,
Retirement,  or  Disability  or (b) by you for Good  Reason,  then you  shall be
entitled to the benefits provided below:

(A) The Company (or one of its  subsidiaries,  if applicable) shall pay you your
full base salary  through the Date of  Termination  at the rate in effect at the
time the Notice of Termination  is given,  no later than the fifth day following
the Date of Termination,  plus all other amounts to which you are entitled under
any  compensation  plan of the  Company  applicable  to you,  at the  time  such
payments are due;

(B) The  Company  shall pay as  severance  pay to you a severance  payment  (the
"Unadjusted  Severance  Payment")  equal to 1.8 times your "Base Amount" as such
term is defined under section  280G(b)(3) of the Code. Your Base Amount shall be
determined in accordance with temporary or final  regulations  promulgated under
section 280G of the Code in effect,  if any. In the absence of such regulations,
if you were not employed by the Company (or any corporation  affiliated with the
Company (an  "Affiliate")  within the  meaning of section  1504 of the Code or a
predecessor  of the Company)  during the entire five  calendar  years (the "Base
Period") preceding the calendar year in which a change in control of the Company
occurred,   your  average   annual   compensation   for  the  purposes  of  such
determination shall be the lesser of (1) the average of your annual compensation
for the complete  calendar years during the Base Period during which you were so
employed or (2) the average of your annual  compensation  for both  complete and
partial calendar years during the Base Period during which you were so employed,
determined by  annualizing  any  compensation  (other than  nonrecurring  items)
includible in your gross income for any partial  calendar year or (3) the annual

<PAGE>

average of your total  compensation for the Base Period during which you were so
employed,  determined by dividing such total compensation by the number of whole
and fractional years included in the Base Period. Compensation payable to you by
the Company or any Affiliate or  predecessor  of the Company shall include every
type and form of compensation includible in your gross income in respect of your
employment  by the  Company or any  Affiliate  or  predecessor  of the  Company,
including  compensation  income recognized as a result of your exercise of stock
options  or sale of the  stock  so  acquired,  except  to the  extent  otherwise
provided in temporary or final regulations promulgated under section 280G of the
Code.  For purposes of this  Section  4(iv) a "change in control of the Company"
shall have the meaning set forth in section  280G of the Code and any  temporary
or final regulations promulgated thereunder.

(C) The  Company  shall  accelerate  vesting  of  options,  both  qualified  and
non-qualified, based on the number of years of continuous employment at the time
of termination.  Vesting of outstanding options will be accelerated 3 months for
each year of employment at the Company. Compensation income recognized by you as
a result of your exercise of such stock options or sale of the stock so acquired
shall be included in deriving the limitations set forth in Section 4(iv)(D),  if
such benefits,  in the opinion of tax counsel  referred to in Section  4(iv)(D),
constitute "parachute payments" within the meaning of section 280G of the Code.

(D) The Unadjusted  Severance  Payment shall not be reduced by the amount of any
other  payment or the value of any benefit  received or to be received by you in
connection  with your  termination of employment or contingent  upon a change in
control of the Company  (whether payable pursuant to the terms of this Agreement
or any other  agreement,  plan or arrangement  with the Company or an Affiliate,
predecessor  or successor of the Company or any person whose actions result in a
change in control of the Company or an Affiliate  of such person)  unless (1) in
the opinion of tax counsel  selected by the Company's  independent  auditors and
reasonably  acceptable  to you,  such other  payment or  benefit  constitutes  a
"parachute  payment"  within the meaning of section 280G(b) (2) of the Code, and
(2) in the opinion of such tax counsel,  the Unadjusted  Severance  Payment plus
all other payments or benefits which constitute  "parachute payments" within the
meaning of  section  280G(b)  (2) of the Code  would  result in a portion of the
Unadjusted  Severance Payment being subject to the excise tax under section 4999
of the Code. In such event, the amount of the Unadjusted Severance Payment shall
be reduced by the minimum amount  necessary such that no portion thereof will be
subject  to the  excise  tax  under  section  4999 of the Code.  The  Unadjusted
Severance  Payment,  as reduced,  if at all,  pursuant to the provisions of this
paragraph shall be referred to as the Adjusted Severance Payment. In determining
whether the Unadjusted  Severance Payment shall be reduced under this paragraph,
(i) there shall not be included in the computation any payment if you shall have

<PAGE>

effectively  waived your receipt or  enjoyment  of such payment or benefit,  and
(ii) the value of any  non-cash  benefit or any deferred  cash payment  shall be
determined  by  the  Company's  independent  auditors  in  accordance  with  the
principles of sections 280G(d) (3) and (4) of the Code.

(E) Except to the extent  that the  payment  thereof  would  subject any payment
hereunder to the excise tax under section 4999 of the Code:

(1) The Company  shall also pay to you all legal fees and  expenses  incurred by
you as a result of such  termination  (including all such fees and expenses,  if
any,  incurred in contesting or disputing any such  termination or in seeking to
obtain or enforce any right or benefit provided by this Agreement); and

(2) For a twelve (12) month period after  termination  of your  employment,  the
Company shall arrange,  at your expense,  to provide you with life,  disability,
accident and health insurance benefits  substantially similar to those which you
are  receiving  or  entitled  to  receive  immediately  prior to the  Notice  of
Termination.  Benefits  otherwise  receivable  by you pursuant to this Section 4
(iv) (D) (2) shall be reduced to the extent  comparable  benefits  are  actually
received  by you  during  the  twenty-four  (24)  month  period  following  your
termination, and any such benefits actually received by you shall be reported to
the Company.

(F) If it is  established  pursuant  to a final  determination  of a court or an
Internal Revenue Service proceeding that,  notwithstanding the good faith of you
and the  Company in applying  the terms of this  Section 4 (iv),  the  aggregate
"parachute  payments"  paid to or for your  benefit  are in an amount that would
result in any portion of such  "parachute  payments" being subject to the excise
tax under section 4999 of the Code, then you shall have an obligation to pay the
Company  upon  demand  an  amount  equal  to the  sum of (1) the  excess  of the
aggregate  "parachute  payments"  paid to or for your benefit over the aggregate
"parachute  payments"  that would have been paid to or for your benefit  without
any portion of such  "parachute  payments" being subject to the excise tax under
section 4999 of the Code; and (2) interest on the amount set forth in clause (1)
of this sentence at the applicable  Federal rate (as defined in section  1274(d)
of the Code) from the date of your receipt of such excess until the date of such
payment.

(G) You shall not be required to mitigate the amount of any payment provided for
in this Section 4 by seeking other employment or otherwise, nor shall the amount
of any  payment  or  benefit  provided  for in this  Section 4 be reduced by any
compensation earned by you as the result of employment by another employer or by
retirement  benefits  after  the Date of  Termination,  or  otherwise  except as
specifically provided in this Section 4.

<PAGE>

(H) The Company shall pay you the Unadjusted  Severance Payment in a lump sum no
later than the fifth day following the Date of Termination;  provided,  however,
that if the Company in good faith believes that the Unadjusted Severance Payment
shall be reduced under the provisions of Section 4 (iv)(C)  hereof,  the Company
shall pay to you at such time a good faith  estimate of the  Adjusted  Severance
Payment (the "Estimated  Adjusted Severance  Payment",  the computation of which
shall be given to you in  writing  together  with a written  explanation  of the
basis for making such  adjustment)  which  amount shall in no event be less than
50% of the Unadjusted  Severance Payment.  The Company shall,  within 60 days of
the  Date of  Termination,  either  pay to you  the  balance  of the  Unadjusted
Severance Payment together with interest thereon at the applicable  Federal rate
(as  defined  in  section  1274(d)  of the Code) or deliver to you a copy of the
opinion of the tax counsel referred to in Section  4(iv)(C) hereof  establishing
the amount of the Adjusted Severance Payment.  If the Adjusted Severance Payment
exceeds the Estimated Adjusted  Severance Payment,  the difference shall be paid
to you at such time  together with interest  thereon at the  applicable  Federal
rate (as defined in section 1274(d) of the Code).

5. Successors; Binding Agreement.


(i) The Company  will require any  successor  (whether  direct or  indirect,  by
purchase, merger, consolidation or otherwise) to all or substantially all of the
business  and/or assets of the Company to expressly  assume and agree to perform
this  Agreement in the same manner and to the same extent that the Company would
be required to perform it if no such succession had taken place.  Failure of the
Company to obtain such  assumption and agreement prior to the  effectiveness  of
any such succession shall be a breach of this Agreement and shall entitle you to
compensation  from the  Company in the same  amount and on the same terms as you
would be entitled  hereunder  if you had  terminated  your  employment  for Good
Reason  following a Change in Control,  except that for purposes of implementing
the foregoing,  the date on which any such succession becomes effective shall be
deemed the Date of Termination. As used in this Agreement,  "Company" shall mean
the Company as  hereinbefore  defined  and any such  successor  to its  business
and/or assets as aforesaid which assumes and agrees to perform this Agreement by
operation of law, or otherwise.  (ii) This Agreement  shall inure to the benefit
of and be  enforceable  by your  personal or legal  representatives,  executors,
administrators,  successors, heirs, distributees,  devisees and legatees. If you
should die while any amount  would still be payable to you  hereunder if you had
continued to live, all such amounts,  unless otherwise provided herein, shall be
paid in accordance with the terms of this Agreement to your devisee,  legatee or
other designee or, if there is no such designee, to your estate.

<PAGE>

6.  Notice.   For  the  purpose  of  this  Agreement,   notices  and  all  other
communications  provided for in the  Agreement  shall be in writing and shall be
deemed  to have been  duly  given  when  delivered  or  mailed by United  States
registered mail,  return receipt  requested,  postage prepaid,  addressed to the
respective  addresses  set forth on the first page of this  Agreement,  provided
that all notices to the Company  shall be directed to the attention of the Chief
Executive Officer with a copy to the Chief Financial  Officer,  or to such other
address as either party may have furnished to the other in writing in accordance
herewith,  except that notice of change of address shall be effective  only upon
receipt.

7.  Miscellaneous.  No provision of this  Agreement  may be modified,  waived or
discharged unless such waiver, modification or discharge is agreed to in writing
and signed by you and such  officer  as may be  specifically  designated  by the
Board.  No waiver by either  party hereto at any time of any breach by the other
party  hereto  of, or  compliance  with,  any  condition  or  provision  of this
Agreement  to be  performed  by such  other  party  shall be  deemed a waiver of
similar or  dissimilar  provisions  or conditions at the same or at any prior to
subsequent time. No agreements or representations, oral or otherwise, express or
implied,  with  respect to the  subject  matter  hereof have been made by either
party  which  are not  expressly  set  forth in this  Agreement.  The  validity,
interpretation, construction and performance of this Agreement shall be governed
by the laws of the State of Delaware. All references to sections of the Exchange
Act or the Code shall be deemed  also to refer to any  successor  provisions  to
such  sections.  Any payments  provided for  hereunder  shall be paid net of any
applicable   withholding  required  under  federal,  state  or  local  law.  The
obligations  of the Company under Section 4 shall survive the  expiration of the
term of this Agreement.

8.  Validity.  The  invalidity  or  unenforceability  of any  provision  of this
Agreement shall not affect the validity or enforceability of any other provision
of this Agreement, which shall remain in full force and effect.

9. Counterparts. This Agreement may be executed in several counterparts, each of
which  shall  be  deemed  to be an  original  but  all of  which  together  will
constitute one and the same instrument.

<PAGE>

10. Arbitration.  Any dispute or controversy arising under or in connection with
this Agreement  shall be settled  exclusively by arbitration in accordance  with
the rules of the American Arbitration  Association then in effect.  Judgment may
be entered on the arbitrator's award in any court having jurisdiction; provided,
however,  that you shall be entitled to seek specific  performance of your right
to be paid until the Date of  Termination  during the pendency of any dispute or
controversy arising under or in connection with this Agreement.

If this letter sets forth our  agreement on the subject  matter  hereof,  kindly
sign and return to the Company the enclosed  copy of this letter which will then
constitute our agreement on this subject.

Sincerely,



/s/ Dick Moeller
------------------------
Dick Moeller
Chairman of the Board
VTEL Corporation


Agreed to this ____ day of ____________________, 2000.



/s/ Steven Cox
------------------------
Steven Cox

<PAGE>



February 15, 2000

Mr. Stephen Von Rump
CEO and President
VTEL Corporation
108 Wild Basin Road
Austin, TX  78746

         RE:  Amendment of Change in Control Agreement

Dear Stephen,

Reference is made to that certain Letter Agreement,  dated September 9, 1998, by
and between you and the  undersigned,  relating to your continued  employment by
VTEL  Corporation  (the "Company")  following a change in control of the Company
(the "Letter Agreement"). Pursuant to Section 4 (iv)(B) of the Letter Agreement,
you are entitled to receive as severance  pay a payment  equal to 1.8 times your
base amount (a  "Severance  Payment") as such term is defined under section 280G
of the Code in effect, if any (the "Base Amount"). Pursuant to Section 4 (iv)(C)
of the Letter  Agreement,  you are also  entitled to an  accelerated  vesting of
outstanding options, both qualified and non-qualified,  such that the vesting of
those  options will be  accelerated  3 months for each year of employment at the
Company.

However,  in consideration of your recent promotion within the Company,  you and
the undersigned  desire to amend the Letter  Agreement to increase the Severance
Payment to 2.5 times your Base Amount.  You and the  undersigned  also desire to
amend the Letter  Agreement  to  increase  the  acceleration  of the  vesting of
options to 6 months for each year of employment.

Therefore,  for good and valuable consideration,  the receipt and sufficiency of
which is hereby  acknowledged,  the first  sentence  of Section 4 (iv)(B) of the
Letter Agreement is hereby amended to read in its entirety as follows:

         The Company shall pay as severance pay to you a severance  payment (the
         "Unadjusted  Severance  Payment") equal to 2.5 times your "Base Amount"
         as such term is defined under section 280G(b)(3) of the Code.

Also, for good and valuable consideration,  the receipt and sufficiency of which
is hereby  acknowledged,  the second sentence of Section 4 (iv)(C) of the Letter
Agreement is hereby amended to read in its entirety as follows:

            Vesting of outstanding options will be accelerated 6 months for each
            year of employment at the Company.

<PAGE>

Except as provided  herein,  the Letter Agreement shall otherwise remain in full
force and effect, as amended hereby. If you agree with the foregoing,  please so
indicate in the space provided below.

Sincerely,



/s/ Dick Moeller
------------------------
Dick Moeller
Chairman of the Board
VTEL Corporation

Agreed and accepted:


/s/ Stephen Von Rump
--------------------------------------------------------------------------------
Stephen Von Rump                                                       Date