AVISTAR COMMUNICATIONS CORP
S-1/A, EX-10.8.1, 2000-08-14
COMPUTER COMMUNICATIONS EQUIPMENT
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<PAGE>   1
                                                                  EXHIBIT 10.8.1

                                             Confidential Treatment Requested by
                                              Avistar Communications Corporation


                MODIFICATION #5 TO PREFERRED SUPPLIER AGREEMENT
                       DATED JUNE 24, 1997 ("AGREEMENT").
       Effective Date of Modification June 27, 2000 ("Modification Date").

The parties hereby agree that as of the Modification Date, certain terms and
conditions of the Agreement, as expressly modified below, shall apply and that
this Modification #5 shall take precedence over the terms contained in the
Agreement and any prior modifications:

1.   NEW ORDER: In conjunction with execution of this Modification #5, an
     Avistar purchase order will be placed for an additional * (or, as
     applicable pursuant to Section 8, * Codec units) ("New Order"). The unit
     price for each Codec on the New Order shall be * plus a per unit
     maintenance fee of *, for a total of purchase price per unit of *. The per
     unit maintenance fee shall replace the annual maintenance fee set forth in
     the Agreement, Section 3.4(b).

2.   PAYMENT TERMS FOR NEW ORDER: Payment terms extended to Avistar for the New
     Order shall be strictly adhered to. Payment terms for all deliveries under
     the New Order shall be * from shipment and Avistar's receipt of invoice.

3.   DELIVERY OF NEW ORDER: Codec units will be shipped in accordance with the
     following estimated delivery schedule, as updated from time to time by
     Avistar. Unless otherwise mutually agreed in writing, Tandberg will ship
     all Codec units under this New Order by no later than *:

<TABLE>
<CAPTION>
# OF UNITS OF THE * TO BE SHIPPED         EXT. SHIP DATE
---------------------------------         --------------
<S>                                      <C>
*                                         *

</TABLE>

4.   MAINTENANCE AND WARRANTY FOR NEW ORDER: All Codec units delivered pursuant
     to this Modification #5 shall be subject to a * warranty and maintenance
     support period from shipment ("Term"). Maintenance services shall be as
     described in the Agreement, including all software upgrades (not deemed to
     be products in their own right) issued during the Term.

5.   ADDITIONAL ORDERS FOR MODEL * CODECS: Avistar acknowledges that Tandberg
     wishes to cease normal production cycles for the Tandberg * Codec and has
     provided Avistar a proposal for an enhanced replacement version as further
     described in Section 6 below. The parties agree that in the event Avistar
     wishes to continue purchasing additional * Codec units, Tandberg will
     manufacture them for Avistar until the end of the *, at the prices
     indicated in Section 1 above, provided that Avistar provides Tandberg with
     (i) a * lead-time from order placement to delivery; and (ii) a minimum
     order of * units.

6.   ENHANCED REPLACEMENT *: Tandberg has suggested it's * as alternative
     replacement Codecs to Avistar in place of the * codecs. The * will be
     available for delivery by no later than *. The functionality of the * shall
     have no less than the functionality and features of the * Codec at a price
     not to exceed * (including maintenance). A * will also be available to
     Avistar at a price not to exceed * (including maintenance). The parties
     will negotiate in good faith the prices for the Enhanced Codecs beginning
     in * based on order quantity, etc.

7.   TESTING UNITS: To facilitate the testing and development effort required to
     ensure Avistar's ability to use the * units proposed by Tandberg, Tandberg
     will, at Avistar's request, provide Avistar up to * loaner units of each
     model of Codec for development and testing purposes. These test units will
     either become part of the first order for * units, or will be returned to
     Tandberg by *. In the case of * units, the parties may mutually agree to
     (i) an extension to the loaner term for these units if Avistar is required
     to provide support for the * (ii) Avistar's return of * of it's existing
     * units in exchange for the * units.

8.   INTERIM SUBSTITUTION OF * CODEC: Tandberg may, at its discretion, ship *
     Codecs to fulfill this Order provided that (i) the * software is installed
     to ensure compatibility with the Avistar System and that the Codec is
     'packaged in such a way so as not to expressly indicate it is not a * unit.
     In the event *, Avistar will ensure that the * capabilities are not
     utilized without first paying Tandberg a * upgrade fee.

9.   ADDITIONAL PRODUCTS, PACKAGING AND SHIP-TO LOCATIONS: At Avistar's request,
     Tandberg agrees to package the Codec in a bundle to include certain
     additional hardware and cables consistent with the Bill-of-Material options
     attached hereto as Exhibit 1 ("Avistar BOM"). Certain Avistar BOM options
     include * units at * per unit. The prices for the additional components of
     the Avistar BOM are detailed on Exhibit 1. When ordered separately from
     Codec units, the * units must be ordered in minimum increments of * units.
     At no additional charge to Avistar, bundled shipments in minimum increments
     of * units, will be sent to one of the following two Avistar Locations, as
     specified by Avistar:

          US:   992 SAN ANTONIO ROAD, PALO ALTO -- CA
          ---------------------------------------------------------------
          UK:   TO BE PROVIDED
          ---------------------------------------------------------------

Except as expressly modified by this Modification #5, all terms and conditions
of the Agreement shall remain in full force and effect until December 31, 2001.
The parties agree that this Modification #5 may be executed via facsimile and
that it shall be considered equivalent to an executed original when signed (via
facsimile) by both parties; nevertheless, any one of the parties may require the
follow-up exchange of originals in hardcopy by so requesting in writing within
five (5) days of facsimile execution.

IN WITNESS WHEREOF, THE PARTIES HAVE CAUSED THIS MODIFICATION #5 TO BE EXECUTED
BY THEIR AUTHORIZED REPRESENTATIVES:

AVISTAR SYSTEMS CORPORATION                                        TANDBERG INC.



By:
   --------------------------------------    -----------------------------------
Printed Name/Title: Rima Vanhill,            Printed Name/Title:
                    Director of Contracts

--------------
* Confidential portions omitted pursuant to a confidential treatment request
and filed separately with the Securities and Exchange Commission.


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