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                                                                     EXHIBIT 5.1


                                December __, 1996

8x8, Inc.
2445 Mission College Boulevard
Santa Clara, CA  95054

         RE: REGISTRATION STATEMENT ON FORM S-1

Ladies and Gentlemen:

         We have examined the Registration Statement on Form S-1 filed by you
with the Securities and Exchange Commission on November 6, 1996 (Registration
No. 333-_____), as amended (the "Registration Statement"), in connection with
the registration under the Securities Act of 1933, as amended, of up to
2,500,000 shares of your Common Stock, par value $0.001 per share (the
"Shares"). The Shares include an over-allotment option granted to the
underwriters of the offering to purchase 375,000 shares. We understand that the
Shares are to be sold to the underwriters of the offering for resale to the
public as described in the Registration Statement. As your legal counsel, we
have examined the proceedings taken, and are familiar with the proceedings
proposed to be taken, by you in connection with the sale and issuance of the
Shares.         

         It is our opinion that, upon completion of the proceedings being taken
or contemplated by us, as your counsel, to be taken prior to the issuance of the
Shares, including the proceedings being taken in order to permit such
transaction to be carried out in accordance with applicable state securities
laws, the Shares, when issued and sold in the manner described in the
Registration Statement and in accordance with the resolutions adopted by the
Board of Directors of the Company, will be legally and validly issued, fully
paid and nonassessable.

         We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever appearing in the
Registration Statement, including the Prospectus constituting a part thereof,
and any amendments thereto.

                                       Very truly yours,

                                       WILSON, SONSINI, GOODRICH & ROSATI
                                       Professional Corporation