Document:

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                                                                   EXHIBIT 10.3

                       AVISTAR COMMUNICATIONS CORPORATION

                            2000 DIRECTOR OPTION PLAN

        1. Purposes of the Plan. The purposes of this 2000 Director Option Plan
are to attract and retain the best available personnel for service as Outside
Directors (as defined herein) of the Company, to provide additional incentive to
the Outside Directors of the Company to serve as Directors, and to encourage
their continued service on the Board.

           All options granted hereunder shall be nonstatutory stock options.

        2. Definitions. As used herein, the following definitions shall apply:

           (a) "Board" shall mean the Board of Directors of the Company.

           (b) "Code" shall mean the Internal Revenue Code of 1986, as amended.

           (c) "Common Stock" shall mean the common stock of the Company.

           (d) "Company" shall mean Avistar Communications Corporation, a
Delaware corporation.

           (e) "Director" shall mean a member of the Board.

           (f) "Disability" shall mean total and permanent disability as defined
in section 22(e)(3) of the Code.

           (g) "Employee" shall mean any person, including officers and
Directors, employed by the Company or any Parent or Subsidiary of the Company.
The payment of a Director's fee by the Company shall not be sufficient in and of
itself to constitute "employment" by the Company.

           (h) "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended.

           (i) "Fair Market Value" shall mean, as of any date, the value of
Common Stock determined as follows:

               (i) If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the Nasdaq
National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its
Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system for
the last market trading day prior to the time of determination as reported in
The Wall Street Journal or such other source as the Administrator deems
reliable;

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               (ii) If the Common Stock is regularly quoted by a recognized
securities dealer but selling prices are not reported, the Fair Market Value of
a Share of Common Stock shall be the mean between the high bid and low asked
prices for the Common Stock for the last market trading day prior to the time of
determination, as reported in The Wall Street Journal or such other source as
the Board deems reliable; or

               (iii) In the absence of an established market for the Common
Stock, the Fair Market Value thereof shall be determined in good faith by the
Board.

           (j) "Inside Director" shall mean a Director who is an Employee.

           (k) "Option" shall mean a stock option granted pursuant to the Plan.

           (l) "Optioned Stock" shall mean the Common Stock subject to an
Option.

           (m) "Optionee" shall mean a Director who holds an Option.

           (n) "Outside Director" shall mean a Director who is not an Employee.

           (o) "Parent" shall mean a "parent corporation," whether now or
hereafter existing, as defined in Section 424(e) of the Code.

           (p) "Plan" shall mean this 1999 Director Option Plan.

           (q) "Share" shall mean a share of the Common Stock, as adjusted in
accordance with Section 10 of the Plan.

           (r) "Subsidiary" shall mean a "subsidiary corporation," whether now
or hereafter existing, as defined in Section 424(f) of the Internal Revenue Code
of 1986.

        3. Stock Subject to the Plan. Subject to the provisions of Section 10 of
the Plan, the maximum aggregate number of Shares which may be optioned and sold
under the Plan is 450,000 Shares (the "Pool") (the Shares may be authorized, but
unissued, or reacquired Common Stock), together with an annual increase to the
number of Shares reserved thereunder on the first day of the Company's fiscal
year, beginning with January 1, 2001, equal to the lesser of (i) 60,000 Shares,
(ii) 0.20% of the outstanding Shares of Common Stock on the last day of each
prior fiscal year or (iii) such amount as determined by the Board.

           If an Option expires or becomes unexercisable without having been
exercised in full, the unpurchased Shares which were subject thereto shall
become available for future grant or sale under the Plan (unless the Plan has
terminated). Shares that have actually been issued under the Plan shall not be
returned to the Plan and shall not become available for future distribution
under the Plan.

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        4. Administration and Grants of Options under the Plan.

           (a) Procedure for Grants. All grants of Options to Outside Directors
under this Plan shall be automatic and nondiscretionary and shall be made
strictly in accordance with the following provisions:

               (i) No person shall have any discretion to select which Outside
Directors shall be granted Options or to determine the number of Shares to be
covered by Options.

               (ii) Each Outside Director shall be automatically granted an
Option to purchase 60,000 Shares (the "First Option") on the date on which the
later of the following events occurs: (A) the effective date of this Plan, as
determined in accordance with Section 6 hereof; or (B) the date on which such
person first becomes an Outside Director, whether through election by the
stockholders of the Company or appointment by the Board to fill a vacancy;
provided, however, that an Inside Director who ceases to be an Inside Director
but who remains a Director shall not receive a First Option. The First Option
for an Outside Director who has not previously received a stock option grant
from the Company shall be for 60,000 Shares.

               (iii) Each Outside Director shall subsequently be automatically
granted an Option to purchase Shares (a "Subsequent Option") on the date of the
next meeting of the Board following the Annual Meeting of Stockholders in each
year commencing with the 2001 Annual Meeting of Stockholders provided he or she
is then an Outside Director and if as of such date, he or she shall have served
on the Board for at least the preceding six (6) months. The Subsequent Option
shall be for 15,000 Shares.

               (iv) Notwithstanding the provisions of subsections (ii) and (iii)
hereof, any exercise of an Option granted before the Company has obtained
stockholder approval of the Plan in accordance with Section 16 hereof shall be
conditioned upon obtaining such stockholder approval of the Plan in accordance
with Section 16 hereof.

               (v) The terms of a First Option granted hereunder shall be as
follows:

                   (A) the term of the First Option shall be ten (10) years.

                   (B) the First Option shall be exercisable only while the
Outside Director remains a Director of the Company, except as set forth in
Sections 8 and 10 hereof.

                   (C) the exercise price per Share shall be 100% of the Fair
Market Value per Share on the date of grant of the First Option provided,
however, that in the case of a First Option granted on the effective date of the
Company's initial public offering pursuant to a registration statement filed
with the Securities and Exchange Commission, the exercise price per share shall
be the initial public offering price per share.

                   (D) subject to Section 10 hereof, the First Option shall
become exercisable as to 1/4 of the Shares subject to the First Option on the
first, second, third and fourth

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anniversaries of the date of grant, so that the First Option shall be fully
exercisable four years after its date of grant, provided that the Optionee
continues to serve as a Director on such dates.

               (vi) The terms of a Subsequent Option granted hereunder shall be
as follows:

                   (A) the term of the Subsequent Option shall be ten (10)
years.

                   (B) the Subsequent Option shall be exercisable only while the
Outside Director remains a Director of the Company, except as set forth in
Sections 8 and 10 hereof.

                   (C) the exercise price per Share shall be 100% of the Fair
Market Value per Share on the date of grant of the Subsequent Option.

                   (D) subject to Section 10 hereof, the Subsequent Option shall
become exercisable cumulatively with respect to 1/4th of the Subsequent Option
at the end of each year after the date of grant, so that the Subsequent Option
shall be fully exercisable four years after its date of grant, provided that the
Optionee continues to serve as a Director on such dates.

               (vii) In the event that any Option granted under the Plan would
cause the number of Shares subject to outstanding Options plus the number of
Shares previously purchased under Options to exceed the Pool, then the remaining
Shares available for Option grant shall be granted under Options to the Outside
Directors on a pro rata basis. No further grants shall be made until such time,
if any, as additional Shares become available for grant under the Plan through
action of the Board or the stockholders to increase the number of Shares which
may be issued under the Plan or through cancellation or expiration of Options
previously granted hereunder.

        5. Eligibility. Options may be granted only to Outside Directors. All
Options shall be automatically granted in accordance with the terms set forth in
Section 4 hereof.

           The Plan shall not confer upon any Optionee any right with respect to
continuation of service as a Director or nomination to serve as a Director, nor
shall it interfere in any way with any rights which the Director or the Company
may have to terminate the Director's relationship with the Company at any time.

        6. Term of Plan. The Plan shall become effective upon the earlier to
occur of its adoption by the Board or its approval by the stockholders of the
Company as described in Section 16 of the Plan; provided, however, the Plan
shall not become effective until the effective date of the Company's initial
public offering pursuant to a registration statement filed with the Securities
and Exchange Commission. It shall continue in effect for a term of ten (10)
years unless sooner terminated under Section 11 of the Plan.

        7. Form of Consideration. The consideration to be paid for the Shares to
be issued upon exercise of an Option, including the method of payment, shall
consist of (i) cash, (ii) check, (iii) other shares which (x) in the case of
Shares acquired upon exercise of an option, have been owned by the Optionee for
more than six (6) months on the date of surrender, and (y) have a Fair

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Market Value on the date of surrender equal to the aggregate exercise price of
the Shares as to which said Option shall be exercised, (iv) consideration
received by the Company under a cashless exercise program implemented by the
Company in connection with the Plan, or (v) any combination of the foregoing
methods of payment.

        8. Exercise of Option.

           (a) Procedure for Exercise; Rights as a Stockholder. Any Option
granted hereunder shall be exercisable at such times as are set forth in Section
4 hereof; provided, however, that no Options shall be exercisable until
stockholder approval of the Plan in accordance with Section 16 hereof has been
obtained.

               An Option may not be exercised for a fraction of a Share.

               An Option shall be deemed to be exercised when written notice of
such exercise has been given to the Company in accordance with the terms of the
Option by the person entitled to exercise the Option and full payment for the
Shares with respect to which the Option is exercised has been received by the
Company. Full payment may consist of any consideration and method of payment
allowable under Section 7 of the Plan. Until the issuance (as evidenced by the
appropriate entry on the books of the Company or of a duly authorized transfer
agent of the Company) of the stock certificate evidencing such Shares, no right
to vote or receive dividends or any other rights as a stockholder shall exist
with respect to the Optioned Stock, notwithstanding the exercise of the Option.
A share certificate for the number of Shares so acquired shall be issued to the
Optionee as soon as practicable after exercise of the Option. No adjustment
shall be made for a dividend or other right for which the record date is prior
to the date the stock certificate is issued, except as provided in Section 10 of
the Plan.

               Exercise of an Option in any manner shall result in a decrease in
the number of Shares which thereafter may be available, both for purposes of the
Plan and for sale under the Option, by the number of Shares as to which the
Option is exercised.

           (b) Termination of Continuous Status as a Director. Subject to
Section 10 hereof, in the event an Optionee's status as a Director terminates
(other than upon the Optionee's death or Disability), the Optionee may exercise
his or her Option, but only within three (3) months following the date of such
termination, and only to the extent that the Optionee was entitled to exercise
it on the date of such termination (but in no event later than the expiration of
its ten (10) year term). To the extent that the Optionee was not entitled to
exercise an Option on the date of such termination, and to the extent that the
Optionee does not exercise such Option (to the extent otherwise so entitled)
within the time specified herein, the Option shall terminate.

           (c) Disability of Optionee. In the event Optionee's status as a
Director terminates as a result of Disability, the Optionee may exercise his or
her Option, but only within twelve (12) months following the date of such
termination, and only to the extent that the Optionee was entitled to exercise
it on the date of such termination (but in no event later than the expiration of
its ten (10) year term). To the extent that the Optionee was not entitled to
exercise an Option on the date of

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termination, or if he or she does not exercise such Option (to the extent
otherwise so entitled) within the time specified herein, the Option shall
terminate.

           (d) Death of Optionee. In the event of an Optionee's death, the
Optionee's estate or a person who acquired the right to exercise the Option by
bequest or inheritance may exercise the Option, but only within twelve (12)
months following the date of death, and only to the extent that the Optionee was
entitled to exercise it on the date of death (but in no event later than the
expiration of its ten (10) year term). To the extent that the Optionee was not
entitled to exercise an Option on the date of death, and to the extent that the
Optionee's estate or a person who acquired the right to exercise such Option
does not exercise such Option (to the extent otherwise so entitled) within the
time specified herein, the Option shall terminate.

        9. Non-Transferability of Options. The Option may not be sold, pledged,
assigned, hypothecated, transferred, or disposed of in any manner other than by
will or by the laws of descent or distribution and may be exercised, during the
lifetime of the Optionee, only by the Optionee.

        10. Adjustments upon Changes in Capitalization, Dissolution, Merger or
Asset Sale.

            (a) Changes in Capitalization. Subject to any required action by the
stockholders of the Company, the number of Shares covered by each outstanding
Option, the number of Shares which have been authorized for issuance under the
Plan but as to which no Options have yet been granted or which have been
returned to the Plan upon cancellation or expiration of an Option, as well as
the price per Share covered by each such outstanding Option, and the number of
Shares issuable pursuant to the automatic grant provisions of Section 4 hereof
shall be proportionately adjusted for any increase or decrease in the number of
issued Shares resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued Shares effected without receipt of
consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration." Except as expressly provided herein, no
issuance by the Company of shares of stock of any class, or securities
convertible into shares of stock of any class, shall affect, and no adjustment
by reason thereof shall be made with respect to, the number or price of Shares
subject to an Option.

            (b) Dissolution or Liquidation. In the event of the proposed
dissolution or liquidation of the Company, to the extent that an Option has not
been previously exercised, it shall terminate immediately prior to the
consummation of such proposed action.

            (c) Merger or Asset Sale. In the event of a merger of the Company
with or into another corporation or the sale of substantially all of the assets
of the Company, outstanding Options may be assumed or equivalent options may be
substituted by the successor corporation or a Parent or Subsidiary thereof (the
"Successor Corporation"). If an Option is assumed or substituted for, the Option
or equivalent option shall continue to be exercisable as provided in Section 4
hereof for so long as the Optionee serves as a Director or a director of the
Successor Corporation. Following such assumption or substitution, if the
Optionee's status as a Director or director of the Successor Corporation, as
applicable, is terminated other than upon a voluntary resignation by the
Optionee,

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the Option or option shall become fully exercisable, including as to Shares for
which it would not otherwise be exercisable. Thereafter, the Option or option
shall remain exercisable in accordance with Sections 8(b) through (d) above.

        If the Successor Corporation does not assume an outstanding Option or
substitute for it an equivalent option, the Option shall become fully vested and
exercisable, including as to Shares for which it would not otherwise be
exercisable. In such event the Board shall notify the Optionee that the Option
shall be fully exercisable for a period of fifteen (15) days from the date of
such notice, and upon the expiration of such period the Option shall terminate.

        For the purposes of this Section 10(c), an Option shall be considered
assumed if, following the merger or sale of assets, the Option confers the right
to purchase or receive, for each Share of Optioned Stock subject to the Option
immediately prior to the merger or sale of assets, the consideration (whether
stock, cash, or other securities or property) received in the merger or sale of
assets by holders of Common Stock for each Share held on the effective date of
the transaction (and if holders were offered a choice of consideration, the type
of consideration chosen by the holders of a majority of the outstanding Shares).
If such consideration received in the merger or sale of assets is not solely
common stock of the successor corporation or its Parent, the Administrator may,
with the consent of the successor corporation, provide for the consideration to
be received upon the exercise of the Option, for each Share of Optioned Stock
subject to the Option, to be solely common stock of the successor corporation or
its Parent equal in fair market value to the per share consideration received by
holders of Common Stock in the merger or sale of assets.

        11. Amendment and Termination of the Plan.

            (a) Amendment and Termination. The Board may at any time amend,
alter, suspend, or discontinue the Plan, but no amendment, alteration,
suspension, or discontinuation shall be made which would impair the rights of
any Optionee under any grant theretofore made, without his or her consent. In
addition, to the extent necessary and desirable to comply with any applicable
law, regulation or stock exchange rule, the Company shall obtain stockholder
approval of any Plan amendment in such a manner and to such a degree as
required.

            (b) Effect of Amendment or Termination. Any such amendment or
termination of the Plan shall not affect Options already granted and such
Options shall remain in full force and effect as if this Plan had not been
amended or terminated.

        12. Time of Granting Options. The date of grant of an Option shall, for
all purposes, be the date determined in accordance with Section 4 hereof.

        13. Conditions Upon Issuance of Shares. Shares shall not be issued
pursuant to the exercise of an Option unless the exercise of such Option and the
issuance and delivery of such Shares pursuant thereto shall comply with all
relevant provisions of law, including, without limitation, the Securities Act of
1933, as amended, the Exchange Act, the rules and regulations promulgated
thereunder, state securities laws, and the requirements of any stock exchange
upon

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which the Shares may then be listed, and shall be further subject to the
approval of counsel for the Company with respect to such compliance.

           As a condition to the exercise of an Option, the Company may require
the person exercising such Option to represent and warrant at the time of any
such exercise that the Shares are being purchased only for investment and
without any present intention to sell or distribute such Shares, if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned relevant provisions of law.

           Inability of the Company to obtain authority from any regulatory body
having jurisdiction, which authority is deemed by the Company's counsel to be
necessary to the lawful issuance and sale of any Shares hereunder, shall relieve
the Company of any liability in respect of the failure to issue or sell such
Shares as to which such requisite authority shall not have been obtained.

        14. Reservation of Shares. The Company, during the term of this Plan,
will at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

        15. Option Agreement. Options shall be evidenced by written option
agreements in such form as the Board shall approve.

        16. Stockholder Approval. The Plan shall be subject to approval by the
stockholders of the Company within twelve (12) months after the date the Plan is
adopted. Such stockholder approval shall be obtained in the degree and manner
required under applicable state and federal law and any stock exchange rules.

                                      -8-<PAGE>   1

                                                                   EXHIBIT 10.4

                       AVISTAR COMMUNICATIONS CORPORATION

                            DIRECTOR OPTION AGREEMENT

        Avistar Communications Corporation, (the "Company"), has granted to
___________________ (the "Optionee"), an option to purchase a total of
[__________ (____)] shares of the Company's Common Stock (the "Optioned Stock"),
at the price determined as provided herein, and in all respects subject to the
terms, definitions and provisions of the Company's 2000 Director Option Plan
(the "Plan") adopted by the Company which is incorporated herein by reference.
The terms defined in the Plan shall have the same defined meanings herein.

        1. Nature of the Option. This Option is a nonstatutory option and is not
intended to qualify for any special tax benefits to the Optionee.

        2. Exercise Price. The exercise price is $_______ for each share of
Common Stock.

        3. Exercise of Option. This Option shall be exercisable during its term
in accordance with the provisions of Section 8 of the Plan as follows:

           (i) Right to Exercise.

               (a) This Option shall become exercisable in installments
cumulatively with respect to one-fourth of the Optioned Stock on the first,
second, third and fourth anniversaries of the date of grant, so that one hundred
percent (100%) of the Optioned Stock shall be exercisable four years after the
date of grant; provided, however, that in no event shall any Option be
exercisable prior to the date the stockholders of the Company approve the Plan.

               (b) This Option may not be exercised for a fraction of a share.

               (c) In the event of Optionee's death, disability or other
termination of service as a Director, the exercisability of the Option is
governed by Section 8 of the Plan.

           (ii) Method of Exercise. This Option shall be exercisable by written
notice which shall state the election to exercise the Option and the number of
Shares in respect of which the Option is being exercised. Such written notice,
in the form attached hereto as Exhibit A, shall be signed by the Optionee and
shall be delivered in person or by certified mail to the Secretary of the
Company. The written notice shall be accompanied by payment of the exercise
price.

        4. Method of Payment. Payment of the exercise price shall be by any of
the following, or a combination thereof, at the election of the Optionee:

           (i) cash;

           (ii) check; or

           (iii) surrender of other shares which (x) in the case of Shares
acquired upon exercise of an Option, have been owned by the Optionee for more
than six (6) months on the date of

<PAGE>   2

surrender, and (y) have a Fair Market Value on the date of surrender equal to
the aggregate exercise price of the Shares as to which said Option shall be
exercised; or

           (iv) delivery of a properly executed exercise notice together with
such other documentation as the Company and the broker, if applicable, shall
require to effect an exercise of the Option and delivery to the Company of the
sale or loan proceeds required to pay the exercise price.

        5. Restrictions on Exercise. This Option may not be exercised if the
issuance of such Shares upon such exercise or the method of payment of
consideration for such shares would constitute a violation of any applicable
federal or state securities or other law or regulations, or if such issuance
would not comply with the requirements of any stock exchange upon which the
Shares may then be listed. As a condition to the exercise of this Option, the
Company may require Optionee to make any representation and warranty to the
Company as may be required by any applicable law or regulation.

        6. Non-Transferability of Option. This Option may not be transferred in
any manner otherwise than by will or by the laws of descent or distribution and
may be exercised during the lifetime of Optionee only by the Optionee. The terms
of this Option shall be binding upon the executors, administrators, heirs,
successors and assigns of the Optionee.

        7. Term of Option. This Option may not be exercised more than ten (10)
years from the date of grant of this Option, and may be exercised during such
period only in accordance with the Plan and the terms of this Option.

        8. Taxation Upon Exercise of Option. Optionee understands that, upon
exercise of this Option, he or she will recognize income for tax purposes in an
amount equal to the excess of the then Fair Market Value of the Shares purchased
over the exercise price paid for such Shares. Since the Optionee is subject to
Section 16(b) of the Securities Exchange Act of 1934, as amended, under certain
limited circumstances the measurement and timing of such income (and the
commencement of any capital gain holding period) may be deferred, and the
Optionee is advised to contact a tax advisor concerning the application of
Section 83 in general and the availability a Section 83(b) election in
particular in connection with the exercise of the Option. Upon a resale of such
Shares by the Optionee, any difference between the sale price and the Fair
Market Value of the Shares on the

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date of exercise of the Option, to the extent not included in income as
described above, will be treated as capital gain or loss.

        DATE OF GRANT:
                       --------------

                                          Avistar Communications Corporation,
                                          a Delaware corporation

                                          By:
                                             ----------------------------------

        Optionee acknowledges receipt of a copy of the Plan, a copy of which is
attached hereto, and represents that he or she is familiar with the terms and
provisions thereof, and hereby accepts this Option subject to all of the terms
and provisions thereof. Optionee hereby agrees to accept as binding, conclusive
and final all decisions or interpretations of the Board upon any questions
arising under the Plan.

        Dated:
              --------------

                                             ----------------------------------
                                             Optionee

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                                    EXHIBIT A

                         DIRECTOR OPTION EXERCISE NOTICE

Avistar Communications Corporation

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

        Attention: Corporate Secretary

        1. Exercise of Option. The undersigned ("Optionee") hereby elects to
exercise Optionee's option to purchase ______ shares of the Common Stock (the
"Shares") of Avistar Communications Corporation (the "Company") under and
pursuant to the Company's 2000 Director Option Plan and the Director Option
Agreement dated _______________ (the "Agreement").

        2. Representations of Optionee. Optionee acknowledges that Optionee has
received, read and understood the Agreement.

        3. Federal Restrictions on Transfer. Optionee understands that the
Shares must be held indefinitely unless they are registered under the Securities
Act of 1933, as amended (the "1933 Act"), or unless an exemption from such
registration is available, and that the certificate(s) representing the Shares
may bear a legend to that effect. Optionee understands that the Company is under
no obligation to register the Shares and that an exemption may not be available
or may not permit Optionee to transfer Shares in the amounts or at the times
proposed by Optionee.

        4. Tax Consequences. Optionee understands that Optionee may suffer
adverse tax consequences as a result of Optionee's purchase or disposition of
the Shares. Optionee represents that Optionee has consulted with any tax
consultant(s) Optionee deems advisable in connection with the purchase or
disposition of the Shares and that Optionee is not relying on the Company for
any tax advice.

        5. Delivery of Payment. Optionee herewith delivers to the Company the
aggregate purchase price for the Shares that Optionee has elected to purchase
and has made provision for the payment of any federal or state withholding taxes
required to be paid or withheld by the Company.

        6. Entire Agreement. The Agreement is incorporated herein by reference.
This Exercise Notice and the Agreement constitute the entire agreement of the
parties and supersede in their entirety all prior undertakings and agreements of
the Company and Optionee with respect to the

<PAGE>   5

subject matter hereof. This Exercise Notice and the Agreement are governed by
California law except for that body of law pertaining to conflict of laws.

        Submitted by:                             Accepted by:

        OPTIONEE:                                 AVISTAR COMMUNICATIONS
                                                  CORPORATION

        By:                                       By:
           -------------------------                 -------------------------

                                                  Its:
                                                      ------------------------
        Address:

        Dated:                                    Dated:
              ----------------------                    ----------------------

                                      -2-

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