AVISTAR COMMUNICATIONS CORP
S-1/A, EX-5.1, 2000-07-27
COMPUTER COMMUNICATIONS EQUIPMENT
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                                                             FORM OF EXHIBIT 5.1

                         [LETTERHEAD OF BRYAN CAVE LLP]


                                     [Date]

Board of Directors
Avistar Communications Corporation
555 Twin Dolphin Drive, Suite 360
Redwood Shores, California 94065



Ladies and Gentlemen:

     We are acting as special counsel for Avistar Communications Corporation, a
Delaware corporation (the "Company"), in connection with various legal matters
relating to the filing of a Registration Statement on Form S-1, No. 333-39008
(the "Registration Statement") with the Securities and Exchange Commission under
the Securities Act of 1933, as amended (the "Act"), covering the offering and
sale of $62,100,000 of shares of the Company's Common Stock, par value $.001 per
share ("Common Stock"), including shares covered by over-allotment options held
by the Underwriters named in the Registration Statement.

     In connection herewith, we have examined and relied without independent
investigation as to matters of fact upon such certificates of public officials,
such statements and certificates of officers of the Company and originals or
copies certified to our satisfaction of the Registration Statement, the
Certificate of Incorporation and By-laws of the Company, proceedings of the
Board of Directors of the Company and such other corporate records, documents,
certificates and instruments as we have deemed necessary or appropriate in order
to enable us to render the opinions expressed below. In rendering this opinion,
we have assumed the genuineness of all signatures on all documents examined by
us, the authenticity of all documents submitted to us as originals and the
conformity to authentic originals of all documents submitted to us as certified
or photostatted copies.

     Based upon the foregoing and in reliance thereon, and upon our review of
applicable statutes and case law, and subject to the qualifications and
limitations stated herein, we are of the opinion that:

          (1)  The Company is a corporation validly existing in good standing
     under the laws of the State of Delaware;
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Avistar Communications Corporation
[Date]
Page 2


          (2)  When the Registration Statement, including any amendments
     thereto, shall have become effective under the Act, and the shares of
     Common Stock being offered and sold by the Company shall have been duly
     issued and sold as contemplated by the Registration Statement, then the
     shares of Common Stock will be legally issued, fully paid and
     non-assessable.

This opinion is not rendered with respect to any laws other than the
General Corporation Law of the State of Delaware and the Act.

     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to our firm under the caption "Legal
Matters" in the Prospectus filed as a part thereof. We also consent to your
filing copies of this opinion as an exhibit to the Registration Statement with
agencies of such states as you deem necessary in the course of complying with
the laws of such states regarding the offering and sale of such shares of Common
Stock. In giving this consent, we do not admit that we are in the category of
persons whose consent is required under Section 7 of the Act or the rules and
regulations of the Securities and Exchange Commission thereunder.

                                       Very truly yours,




/shw


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