<PAGE>   1


           As filed with the Securities and Exchange Commission on July 30, 2001
                                                Registration No. 333-___________
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933


                                    8X8, INC.

             (Exact name of registrant as specified in its charter)


                   Delaware                        77-0142404
        (State or other jurisdiction of         (I.R.S. Employer
        incorporation or organization)       Identification Number)


                           2445 Mission College Blvd.
                          Santa Clara, California 95054
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)

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

                                 1996 STOCK PLAN
                        1996 EMPLOYEE STOCK PURCHASE PLAN
                            (Full title of the plans)

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

                                 David M. Stoll
                             Chief Financial Officer
                                    8x8, Inc.
                           2445 Mission College Blvd.
                          Santa Clara, California 95054
                                 (408) 727-1885
(Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

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

                                    Copy to:

                             John T. Sheridan, Esq.
                     Wilson Sonsini Goodrich & Rosati, P.C.
                               650 Page Mill Road
                           Palo Alto, California 94304


================================================================================


<PAGE>   2




<TABLE>
<CAPTION>
                                  CALCULATION OF REGISTRATION FEE
==========================================================================================================
          Title of Securities                Amount          Proposed        Proposed        Amount of
           to be Registered                   to be          Maximum         Maximum       Registration
                                           Registered        Offering       Aggregate           Fee
                                                              Price          Offering
                                                           Per Share (1)       Price
----------------------------------------------------------------------------------------------------------
<S>                                       <C>              <C>            <C>             <C>
Common Stock (par value $0.001 per
share) to be issued upon exercise of
options granted under the 1996 Stock
Plan                                        1,149,984         $1.21       $1,391,480.64        $287.50
----------------------------------------------------------------------------------------------------------
Common Stock (par value $0.001 per
share) to be issued pursuant to the
1996 Employee Stock Purchase Plan             500,000         $1.21         $605,000.00        $151.25
----------------------------------------------------------------------------------------------------------

        Total                                                             $1,996,480.64        $ 438.75
==========================================================================================================
</TABLE>

(1)  Estimated in accordance with Rule 457(h) solely for the purpose of
     calculating the registration fee, based on the opening price as reported by
     The Nasdaq Stock Market on July 25, 2001.


<PAGE>   3


                                    8X8, INC.

                       REGISTRATION STATEMENT ON FORM S-8

                                     PART II

ITEM 3.     INCORPORATION OF DOCUMENTS BY REFERENCE.

            8x8, Inc. (the "Registrant") hereby incorporates by reference into
this Registration Statement the following documents and information previously
filed with the Securities and Exchange Commission (the "Commission") by the
Registrant:

            1.    The Registrant's Annual Report on Form 10-K for the year ended
                  March 31, 2001, filed pursuant to Section 13(a) of the
                  Securities Exchange Act of 1934, as amended (the "Exchange
                  Act").

            2.    The description of Registrant's Common Stock contained in the
                  Registrant's Registration Statement on Form 8-A (File
                  No.000-21783) pursuant to Section 12 of the Exchange Act,
                  including any amendment or report filed for the purpose of
                  updating such description.

            3.    All documents filed by Registrant pursuant to Sections 13(a),
                  13(c), 14 and 15(d) of the Exchange Act after the date hereof,
                  and prior to the filing of a post-effective amendment which
                  indicates that all securities offered hereunder have been sold
                  or which de-registers all securities then remaining unsold
                  under this registration statement, shall be deemed to be
                  incorporated by reference herein and to be part hereof from
                  the date of filing of such documents.

            The 8x8, Inc. documents incorporated by reference herein contain
forward-looking statements that involve risks and uncertainties. 8x8, Inc.'s
actual results may differ significantly from the results discussed in the
forward-looking statements. Factors that might cause such a difference include,
but are not limited to, the risks identified in the respective documents
incorporated by reference.


ITEM 4.     DESCRIPTION OF SECURITIES.

            Not applicable.


ITEM 5.     INTERESTS OF NAMED EXPERTS AND COUNSEL.

            Not applicable.


ITEM 6.     INDEMNIFICATION OF DIRECTORS AND OFFICERS.

            Section 145 of the Delaware General Corporation Law authorizes a
court to award, or a corporation's Board of Directors to grant, indemnity to
directors and officers in terms sufficiently broad to permit


                                      II-1


<PAGE>   4

such indemnification under certain circumstances for liabilities (including
reimbursement for expenses incurred) arising under the Securities Act of 1933,
as amended (the "Securities Act"). Article 9 of the Registrant's Restated
Certificate of Incorporation and Article 6.1 of the Bylaws of the Registrant
provide for indemnification of certain agents to the maximum extent permitted by
the Delaware General Corporation Law. Persons covered by these indemnification
provisions include current and former directors, officers, employees and other
agents of the Registrant, as well as persons who serve at the request of the
Registrant as directors, officers, employees or agents of another enterprise. In
addition, the Registrant has entered into agreements with its officers and
directors which require the Registrant to indemnify its officers and directors
to the maximum extent permitted under Delaware law.


ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED.

            Not applicable.


ITEM 8.  EXHIBITS.

<TABLE>
<CAPTION>
Exhibit
Number
-------
<S>         <C>
  5.1       Opinion of Wilson Sonsini Goodrich & Rosati, P.C.

 10.2*      1996 Stock Plan, as amended, and Form of Stock Option Agreement thereunder

 10.3**     1996 Employee Stock Purchase Plan, as amended, and Form of Subscription
            Agreement thereunder

 23.1       Consent of PricewaterhouseCoopers LLP, Independent Accountants

 23.2       Consent of Wilson Sonsini Goodrich & Rosati, P.C. (included in Exhibit 5.1)

 24.1       Power of Attorney (see page II-4)
</TABLE>
--------------------------------------------------------------------------------


* Incorporated by reference to exhibit 4.1 filed in response to Item 8,
  "Exhibits," of the Registrant's Registration Statement on Form S-8 (File No.
  333-49410) dated November 7, 2000.

**Incorporated by reference to exhibit 10.3 filed in response to Item 8,
  "Exhibits," of the Registrant's Registration Statement on Form S-8 (File No.
  333-50519) dated April 20, 1998.


ITEM 9.  UNDERTAKINGS.

            (a)   The undersigned Registrant hereby undertakes:


                                      II-2
<PAGE>   5

                  (1) To file, during any period in which offers or sales are
being made, a post-effective amendment to this Registration Statement to include
any material information with respect to the plan of distribution not previously
disclosed in the Registration Statement or any material change to such
information in the Registration Statement.

                  (2) That, for the purpose of determining any liability under
the Securities Act, each such post-effective amendment shall be deemed to be a
new Registration Statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

                  (3) To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

            (b) The undersigned Registrant hereby undertakes that, for purposes
of determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the Registration Statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

            (c) Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers and controlling persons
of the Registrant pursuant to the foregoing provisions, or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the
Securities Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.


                                      II-3
<PAGE>   6


                                   SIGNATURES

            Pursuant to the requirements of the Securities Act of 1933, as
amended, the Registrant certifies that it has reasonable grounds to believe that
it meets all of the requirements for filing on Form S-8 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto,
duly authorized, in the City of Santa Clara, State of California, on July 30,
2001.

                                    8X8, INC.

                                    By:  /s/ David M. Stoll
                                         -------------------------------
                                         David M. Stoll, Chief Financial Officer
                                         and Vice President, Finance


                                POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints Joe Parkinson and David M. Stoll jointly and
severally, his attorneys-in-fact, each with the power of substitution, for him
in any and all capacities, to sign any amendments to this Registration Statement
on Form S-8, and to file the same, with exhibits thereto and other documents in
connection therewith, with the Securities and Exchange Commission, hereby
ratifying and confirming all that each of said attorneys-in-fact, or his
substitute or substitutes, may do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, as amended, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
             SIGNATURE                                 TITLE                         DATE

<S>                                       <C>                                   <C>
/s/ Joe Parkinson                         Chairman of the Board and Chief       July 30, 2001
--------------------------------------    Executive Officer (Principal
             Joe Parkinson                Executive Officer)


/s/ David M. Stoll                        Chief Financial Officer and Vice      July 30, 2001
--------------------------------------    President, Finance  (Principal
            David M. Stoll                Financial and Accounting Officer)


/s/ Bryan R. Martin                       President, Chief Operating Officer    July 30, 2001
--------------------------------------    and Director
            Bryan R. Martin


/s/ Bernd Girod                           Director                              July 30, 2001
--------------------------------------
              Bernd Girod


/s/ Guy L. Hecker, Jr.                    Director                              July 30, 2001
--------------------------------------
          Guy L. Hecker, Jr.


                                          Director
--------------------------------------
          Christos Lagomichos


/s/ William Tai                           Director                              July 30, 2001
--------------------------------------
             William Tai

</TABLE>


<PAGE>   7



                                INDEX TO EXHIBITS


<TABLE>
<CAPTION>
Exhibit
Number                         Description
-------                        -----------
<S>         <C>
  5.1       Opinion of Wilson Sonsini Goodrich & Rosati, P.C.

 10.2*      1996 Stock Plan, as amended, and Form of Stock Option Agreement thereunder

 10.3**     1996 Employee Stock Purchase Plan, as amended, and Form of Subscription
            Agreement thereunder

 23.1       Consent of PricewaterhouseCoopers LLP, Independent Accountants

 23.2       Consent of Wilson Sonsini Goodrich & Rosati, P.C. (included in Exhibit 5.1)

 24.1       Power of Attorney (see page II-4)
</TABLE>

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

* Incorporated by reference to exhibit 4.1 filed in response to Item 8,
  "Exhibits," of the Registrant's Registration Statement on Form S-8 (File No.
  333-49410) dated November 7, 2000.

**Incorporated by reference to exhibit 10.3 filed in response to Item 8,
  "Exhibits," of the Registrant's Registration Statement on Form S-8 (File No.
  333-50519) dated April 20, 1998.
[{"type": "S-8", "sequence": "1", "filename": "f74462ors-8.txt", "description": "FORM S-8", "secsgml_size_bytes": 15808}]
{"company-data": {"conformed-name": "8X8 INC /DE/", "cik": "0001023731", "assigned-sic": "3674", "irs-number": "770142404", "state-of-incorporation": "DE", "fiscal-year-end": "0331"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-66296", "film-number": "1693177"}, "business-address": {"street1": "2445 MISSION COLLEGE BLVD", "city": "SANTA CLARA", "state": "CA", "zip": "95054", "phone": "4087271885"}, "mail-address": {"street1": "2445 MISSION COLLEGE BLVD", "city": "SANTA CLARA", "state": "CA", "zip": "95054"}, "former-company": [{"former-conformed-name": "8X8 INC", "date-changed": "19961023"}, {"former-conformed-name": "NETERGY NETWORKS INC", "date-changed": "20000912"}]}
1

           As filed with the Securities and Exchange Commission on July 30, 2001
                                                Registration No. 333-___________
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                                    8X8, INC.

             (Exact name of registrant as specified in its charter)

                   Delaware                        77-0142404
        (State or other jurisdiction of         (I.R.S. Employer
        incorporation or organization)       Identification Number)

                           2445 Mission College Blvd.
                          Santa Clara, California 95054
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)

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

                                 1996 STOCK PLAN
                        1996 EMPLOYEE STOCK PURCHASE PLAN
                            (Full title of the plans)

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

                                 David M. Stoll
                             Chief Financial Officer
                                    8x8, Inc.
                           2445 Mission College Blvd.
                          Santa Clara, California 95054
                                 (408) 727-1885
(Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

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

                                    Copy to:

                             John T. Sheridan, Esq.
                     Wilson Sonsini Goodrich & Rosati, P.C.
                               650 Page Mill Road
                           Palo Alto, California 94304

================================================================================
2
CALCULATION OF REGISTRATION FEE
==========================================================================================================
          Title of Securities                Amount          Proposed        Proposed        Amount of
           to be Registered                   to be          Maximum         Maximum       Registration
                                           Registered        Offering       Aggregate           Fee
                                                              Price          Offering
                                                           Per Share (1)       Price
----------------------------------------------------------------------------------------------------------
Common Stock (par value $0.001 per
share) to be issued upon exercise of
options granted under the 1996 Stock
Plan                                        1,149,984         $1.21       $1,391,480.64        $287.50
----------------------------------------------------------------------------------------------------------
Common Stock (par value $0.001 per
share) to be issued pursuant to the
1996 Employee Stock Purchase Plan             500,000         $1.21         $605,000.00        $151.25
----------------------------------------------------------------------------------------------------------

        Total                                                             $1,996,480.64        $ 438.75
==========================================================================================================
(1)  Estimated in accordance with Rule 457(h) solely for the purpose of
     calculating the registration fee, based on the opening price as reported by
     The Nasdaq Stock Market on July 25, 2001.
3

                                    8X8, INC.

                       REGISTRATION STATEMENT ON FORM S-8

                                     PART II

ITEM 3.     INCORPORATION OF DOCUMENTS BY REFERENCE.

            8x8, Inc. (the "Registrant") hereby incorporates by reference into
this Registration Statement the following documents and information previously
filed with the Securities and Exchange Commission (the "Commission") by the
Registrant:

            1.    The Registrant's Annual Report on Form 10-K for the year ended
                  March 31, 2001, filed pursuant to Section 13(a) of the
                  Securities Exchange Act of 1934, as amended (the "Exchange
                  Act").

            2.    The description of Registrant's Common Stock contained in the
                  Registrant's Registration Statement on Form 8-A (File
                  No.000-21783) pursuant to Section 12 of the Exchange Act,
                  including any amendment or report filed for the purpose of
                  updating such description.

            3.    All documents filed by Registrant pursuant to Sections 13(a),
                  13(c), 14 and 15(d) of the Exchange Act after the date hereof,
                  and prior to the filing of a post-effective amendment which
                  indicates that all securities offered hereunder have been sold
                  or which de-registers all securities then remaining unsold
                  under this registration statement, shall be deemed to be
                  incorporated by reference herein and to be part hereof from
                  the date of filing of such documents.

            The 8x8, Inc. documents incorporated by reference herein contain
forward-looking statements that involve risks and uncertainties. 8x8, Inc.'s
actual results may differ significantly from the results discussed in the
forward-looking statements. Factors that might cause such a difference include,
but are not limited to, the risks identified in the respective documents
incorporated by reference.

ITEM 4.     DESCRIPTION OF SECURITIES.

            Not applicable.

ITEM 5.     INTERESTS OF NAMED EXPERTS AND COUNSEL.

            Not applicable.

ITEM 6.     INDEMNIFICATION OF DIRECTORS AND OFFICERS.

            Section 145 of the Delaware General Corporation Law authorizes a
court to award, or a corporation's Board of Directors to grant, indemnity to
directors and officers in terms sufficiently broad to permit

                                      II-1
4

such indemnification under certain circumstances for liabilities (including
reimbursement for expenses incurred) arising under the Securities Act of 1933,
as amended (the "Securities Act"). Article 9 of the Registrant's Restated
Certificate of Incorporation and Article 6.1 of the Bylaws of the Registrant
provide for indemnification of certain agents to the maximum extent permitted by
the Delaware General Corporation Law. Persons covered by these indemnification
provisions include current and former directors, officers, employees and other
agents of the Registrant, as well as persons who serve at the request of the
Registrant as directors, officers, employees or agents of another enterprise. In
addition, the Registrant has entered into agreements with its officers and
directors which require the Registrant to indemnify its officers and directors
to the maximum extent permitted under Delaware law.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED.

            Not applicable.

ITEM 8.  EXHIBITS.
Exhibit
Number
-------
5.1       Opinion of Wilson Sonsini Goodrich & Rosati, P.C.

 10.2*      1996 Stock Plan, as amended, and Form of Stock Option Agreement thereunder

 10.3**     1996 Employee Stock Purchase Plan, as amended, and Form of Subscription
            Agreement thereunder

 23.1       Consent of PricewaterhouseCoopers LLP, Independent Accountants

 23.2       Consent of Wilson Sonsini Goodrich & Rosati, P.C. (included in Exhibit 5.1)

 24.1       Power of Attorney (see page II-4)
--------------------------------------------------------------------------------

* Incorporated by reference to exhibit 4.1 filed in response to Item 8,
  "Exhibits," of the Registrant's Registration Statement on Form S-8 (File No.
  333-49410) dated November 7, 2000.

**Incorporated by reference to exhibit 10.3 filed in response to Item 8,
  "Exhibits," of the Registrant's Registration Statement on Form S-8 (File No.
  333-50519) dated April 20, 1998.

ITEM 9.  UNDERTAKINGS.

            (a)   The undersigned Registrant hereby undertakes:

                                      II-2
5

                  (1) To file, during any period in which offers or sales are
being made, a post-effective amendment to this Registration Statement to include
any material information with respect to the plan of distribution not previously
disclosed in the Registration Statement or any material change to such
information in the Registration Statement.

                  (2) That, for the purpose of determining any liability under
the Securities Act, each such post-effective amendment shall be deemed to be a
new Registration Statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

                  (3) To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

            (b) The undersigned Registrant hereby undertakes that, for purposes
of determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the Registration Statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

            (c) Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers and controlling persons
of the Registrant pursuant to the foregoing provisions, or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the
Securities Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.

                                      II-3
6

                                   SIGNATURES

            Pursuant to the requirements of the Securities Act of 1933, as
amended, the Registrant certifies that it has reasonable grounds to believe that
it meets all of the requirements for filing on Form S-8 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto,
duly authorized, in the City of Santa Clara, State of California, on July 30,
2001.

                                    8X8, INC.

                                    By:  /s/ David M. Stoll
                                         -------------------------------
                                         David M. Stoll, Chief Financial Officer
                                         and Vice President, Finance

                                POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints Joe Parkinson and David M. Stoll jointly and
severally, his attorneys-in-fact, each with the power of substitution, for him
in any and all capacities, to sign any amendments to this Registration Statement
on Form S-8, and to file the same, with exhibits thereto and other documents in
connection therewith, with the Securities and Exchange Commission, hereby
ratifying and confirming all that each of said attorneys-in-fact, or his
substitute or substitutes, may do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, as amended, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.
SIGNATURE                                 TITLE                         DATE
/s/ Joe Parkinson                         Chairman of the Board and Chief       July 30, 2001
--------------------------------------    Executive Officer (Principal
             Joe Parkinson                Executive Officer)

/s/ David M. Stoll                        Chief Financial Officer and Vice      July 30, 2001
--------------------------------------    President, Finance  (Principal
            David M. Stoll                Financial and Accounting Officer)

/s/ Bryan R. Martin                       President, Chief Operating Officer    July 30, 2001
--------------------------------------    and Director
            Bryan R. Martin

/s/ Bernd Girod                           Director                              July 30, 2001
--------------------------------------
              Bernd Girod

/s/ Guy L. Hecker, Jr.                    Director                              July 30, 2001
--------------------------------------
          Guy L. Hecker, Jr.

                                          Director
--------------------------------------
          Christos Lagomichos

/s/ William Tai                           Director                              July 30, 2001
--------------------------------------
             William Tai
7

                                INDEX TO EXHIBITS
Exhibit
Number                         Description
-------                        -----------
5.1       Opinion of Wilson Sonsini Goodrich & Rosati, P.C.

 10.2*      1996 Stock Plan, as amended, and Form of Stock Option Agreement thereunder

 10.3**     1996 Employee Stock Purchase Plan, as amended, and Form of Subscription
            Agreement thereunder

 23.1       Consent of PricewaterhouseCoopers LLP, Independent Accountants

 23.2       Consent of Wilson Sonsini Goodrich & Rosati, P.C. (included in Exhibit 5.1)

 24.1       Power of Attorney (see page II-4)
-----------------------

* Incorporated by reference to exhibit 4.1 filed in response to Item 8,
  "Exhibits," of the Registrant's Registration Statement on Form S-8 (File No.
  333-49410) dated November 7, 2000.

**Incorporated by reference to exhibit 10.3 filed in response to Item 8,
  "Exhibits," of the Registrant's Registration Statement on Form S-8 (File No.
  333-50519) dated April 20, 1998.