EXHIBIT 4.2
                      GODIGITAL TELECOMMUNICATIONS, INC.

                          THIRD AMENDED AND RESTATED
                         SHAREHOLDER RIGHTS AGREEMENT



     This Third Amended and Restated Shareholder Rights Agreement (the "Rights
Agreement"), dated as of July 30, 1999, is entered into by and among GoDigital
Telecommunications, Inc., a California corporation (the "Company"), the
purchasers of Series A Preferred Stock and Series B Preferred Stock of the
Company pursuant to that certain Series A Preferred Stock and Series B Preferred
Stock Purchase Agreement dated as of April 2, 1996 (the "Series A and B
Agreement") among the Company and such purchasers (the "Series A and B
Purchasers"), the purchasers of Series C Preferred Stock of the Company pursuant
to that certain Series C Preferred Stock Purchase Agreement dated as of August
5, 1997 (the "Series C Agreement") among the Company and such purchasers (the
"Series C Purchasers"), the purchasers of Series D Preferred Stock of the
Company pursuant to that certain Series D Preferred Stock Purchase Agreement
dated as of September 22, 1998 (the "Series D Agreement") among the Company and
such purchasers (the "Series D Purchasers") and the purchasers of Series E
Preferred Stock of the Company pursuant to that certain Series E Preferred Stock
Purchase Agreement of even date herewith (the "Series E Agreement") among the
Company and such purchasers (the "Series E Purchasers") (the Series A and B
Purchasers, the Series C Purchasers, the Series D Purchasers and the Series E
Purchasers being collectively referred to herein as the "Purchasers").

                                  R E C I T A L S
                                  ---------------

     NOW THEREFORE, in consideration of the mutual promises and covenants
hereinafter set forth, the parties hereto agree as follows:

     A.  Pursuant to the Series A and B Agreement, the Series A and B Purchasers
have purchased 2,678,500 shares of Series A Preferred Stock of the Company (the
"Series A Preferred"), and 1,339,250 shares of Series B Preferred Stock of the
Company (the "Series B Preferred"); pursuant to the Series C Agreement, the
Series C Purchasers have purchased 1,992,476 shares of Series C Preferred Stock
of the Company (the "Series C Preferred"); pursuant to the Series D Agreement,
the Series D Purchasers purchased 440,717 shares of Series D Preferred Stock of
the Company (the "Series D Preferred"); and pursuant to the Series E Agreement,
the Company shall sell to the Series E Purchasers up to 680,000 shares of Series
E Preferred Stock of the Company (the "Series E Preferred") (the Series A
Preferred, Series B Preferred, Series C Preferred, Series D Preferred and Series
E Preferred are hereinafter collectively referred to as the "Preferred Stock").
In connection with the Series D Agreement, the Series A and B Purchasers, the
Series C Purchasers, the Series D Purchasers and the Company entered into a
Second Amended and Restated Shareholder Rights Agreement dated September 22,
1998 (the "Prior Rights Agreement") setting forth their agreement and
understandings with respect to certain rights and privileges accompanying the
shares of the Series A Preferred, Series B Preferred,  Series C Preferred and
Series D Preferred.


     B.  Concurrently herewith, the Series E Purchasers and the Company are
entering into the Series E Agreement, pursuant to which the Purchasers are
purchasing from the Company the Series E Preferred.

     C.  The obligations of each of the Series E Purchasers to purchase their
respective amounts of Series E Preferred Stock is conditioned upon, among other
things, the execution and delivery of this Rights Agreement by each of the
Purchasers and the Company.

     D.  The Series A and B Purchasers, the Series C Purchasers, the Series D
Purchasers and the Company desire to amend and restate the Prior Rights
Agreement and to accept the rights created pursuant hereto in lieu of the rights
granted to them under the Prior Rights Agreement including, without limitation a
termination of the Right of First Refusal (as that term is defined in the Prior
Rights Agreement) contained in the Prior Rights Agreement.

     NOW THEREFORE, in consideration of the mutual promises and covenants
hereinafter set forth, the parties to the Prior Rights Agreement agree that the
Prior Rights Agreement shall be superseded and replaced in its entirety by this
Rights Agreement and that the Right of First Refusal contained in the Prior
Rights Agreement is hereby terminated and of no further force or effect, and the
parties hereto agree as follows:

     1.  Certain Definitions.  As used in this Rights Agreement, the following
         -------------------
terms shall have the following respective meanings:

          "Commission" shall mean the Securities and Exchange Commission or any
other federal agency at the time administering the Securities Act.

          "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, and the rules and regulations promulgated thereunder.

          "Holder" or "Holders" shall mean any holder, or an assignee under
Section 3.11 hereof, of outstanding Registrable Securities.

          "Initiating Holders" shall mean any Holders who in the aggregate are
Holders of two-thirds (2/3) or more of the Registrable Securities.

          The terms "register," "registered" and "registration" shall refer to a
registration effected by preparing and filing a registration statement in
compliance with the Securities Act and the declaration or ordering of the
effectiveness of such registration statement.

          "Registrable Securities" shall mean shares of common stock of the
Company ("Common Stock") (i) issued or issuable pursuant to the conversion of
the Series A Preferred, Series B Preferred, Series C Preferred, Series D
Preferred or Series E Preferred (the "Conversion Shares") and (ii) issued in


respect of securities issued pursuant to the conversion of the Series A
Preferred, Series B Preferred, Series C Preferred, Series D Preferred or Series
E Preferred upon any stock split, stock dividend, recapitalization,
substitution, or similar event; provided, however, that Registrable Securities
                                --------  -------
shall not include any (a) shares of Common Stock which may be sold pursuant to
an effective registration statement, (b) shares of Common Stock which have
previously been sold to the public, or (c) securities which would otherwise be
Registrable Securities held by a Holder who is then permitted to sell all of
such securities within any three (3) month period following the Company's
initial public offering pursuant to Rule 144.

          "Registration Expenses" shall mean all expenses (excluding
underwriting discounts and selling commissions) incurred in connection with a
registration under Sections 3.1, 3.2 or 3.4 hereof, including, without
limitation, all registration and filing fees, printing expenses, fees and
disbursements of counsel for the Company, blue sky fees and expenses, and the
expense of any special audits incident to or required by any such registration,
and the reasonable fees and expenses of one counsel for the selling shareholders
(but excluding the compensation of regular employees of the Company, which shall
be paid in any event by the Company).

          "Restricted Securities" shall mean the securities of the Company
required to bear or bearing the legend set forth in Section 2.1 hereof.

          "Rule 144" shall mean Rule 144 as promulgated by the Commission under
the Securities Act.

          "Securities Act" shall mean the Securities Act of 1933, as amended,
and the rules and regulations promulgated thereunder.

          "Selling Expenses" shall include all underwriting discounts and
selling commissions applicable to the sale of Registrable Securities.

     2.  Restrictions on Transferability.  The Restricted Securities shall not
         -------------------------------
be transferred except upon the conditions specified in this Rights Agreement,
which conditions are intended to insure compliance with the provisions of the
Securities Act or, in the case of Section 3.12 hereof, to assist in an orderly
distribution.  Each holder of Restricted Securities will cause any proposed
transferee of Restricted Securities held by that holder to agree to take and
hold those securities subject to the provisions and upon the conditions
specified in this Rights Agreement.

          2.1  Restrictive Legend.  Each certificate representing (i) the Series
               ------------------
A Preferred, Series B Preferred, Series C Preferred, Series D Preferred and
Series E Preferred, and (ii) shares of the Company's Common Stock issued upon
conversion of the Series A Preferred, Series B Preferred, Series C Preferred,
Series D Preferred or Series E Preferred, and (iii) any other securities issued
in respect of the Series A Preferred, Series B Preferred, Series C Preferred,
Series D Preferred or Series E Preferred or the Common Stock issued upon
conversion of the Series A Preferred, Series B Preferred, Series C Preferred,
Series D Preferred or Series E Preferred, upon any stock split, stock dividend,
recapitalization,

                                       3


merger, consolidation or similar event, shall (unless otherwise permitted or
unless the securities evidenced by such certificate shall have been registered
under the Securities Act) be stamped or otherwise imprinted with a legend
substantially in the following form (in addition to any legend required under
applicable state securities laws):

          THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE BEEN ACQUIRED FOR
          INVESTMENT AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
          1933, AS AMENDED, (THE "ACT") OR ANY STATE SECURITIES LAWS.  SUCH
          SHARES MAY NOT BE SOLD OR OFFERED FOR SALE IN THE ABSENCE OF SUCH
          REGISTRATION OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY AND
          ITS COUNSEL THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE ACT.
          COPIES OF THE AGREEMENTS COVERING THE PURCHASE OF THESE SHARES AND
          RESTRICTING THEIR TRANSFER MAY BE OBTAINED AT NO COST BY WRITTEN
          REQUEST MADE BY THE HOLDER OF RECORD OF THIS CERTIFICATE TO THE
          SECRETARY OF THE CORPORATION AT THE PRINCIPAL EXECUTIVE OFFICE OF THE
          CORPORATION.

          Upon request of a holder of such a certificate, the Company shall
remove the foregoing legend from the certificate or issue to such holder a new
certificate therefor free of any transfer legend, if, with such request, the
Company shall have received either the opinion or the "no-action" letter
referred to in Section 2.2 to the effect that any transfer by such holder of the
securities evidenced by such certificate will not violate the Securities Act and
applicable state securities laws, unless any such transfer legend may be removed
pursuant to Rule 144(k), in which case no such opinion or "no-action" letter
shall be required, and provided that the Company shall not be obligated to
remove any such legends prior to the date of the initial public offering of the
Company's Common Stock under the Securities Act.

          2.2  Notice of Proposed Transfers.  The holder of each certificate
               ----------------------------
representing Restricted Securities by acceptance thereof agrees to comply in all
respects with the provisions of this Section 2.2.  Prior to any proposed
transfer of any Restricted Securities (other than under circumstances described
in Sections 3.1, 3.2 and 3.4 hereof), the holder thereof shall give written
notice to the Company of such holder's intention to effect such transfer.  Each
such notice shall describe the manner and circumstances of the proposed transfer
in sufficient detail, and shall be accompanied (except in transactions in
compliance with Rule 144(k) promulgated under the Securities Act or for a
transfer to a holder's spouse, ancestors, descendants or a trust for any of
their benefit, or in transactions involving the distribution without
consideration of Restricted Securities by a holder to any of its partners or
retired partners or to the estate of any of its partners or retired partners) by
either (i) a written opinion of legal counsel to the holder who shall be
reasonably satisfactory to the Company, addressed to the Company and reasonably
satisfactory in form and substance to the Company's counsel, to the effect that
the proposed transfer of the Restricted Securities may be effected without
registration under the Securities Act or (ii) a "no-action" letter from the
Commission to the effect that the distribution of such securities without
registration will not result in a recommendation by the staff of the Commission
that action be taken with respect thereto, whereupon the holder of such
Restricted Securities shall be entitled to transfer

                                       4


such Restricted Securities in accordance with the terms of the notice delivered
by such holder to the Company. Each certificate evidencing the Restricted
Securities transferred as above provided shall bear the restrictive legend set
forth in Section 2.1 above, except that such certificate shall not bear such
restrictive legend after the date of the Company's initial public offering under
the Securities Act if the opinion of counsel or "no-action" letter referred to
above expressly indicates that such legend is not required in order to establish
compliance with the Act or if such legend is no longer required pursuant to Rule
144(k).

     3.  Registration Rights.
         -------------------

          3.1  Demand Registration.
               -------------------

            (a) Request for Registration.  If the Company shall receive from
                ------------------------
Initiating Holders a written request that the Company effect any registration
with respect to at least fifty percent (50%) of the Registrable Securities
(provided that such number of Registrable Securities would result in an
aggregate offering of at least $7,500,000), the Company will:

                    (i) promptly given written notice of the proposed
          registration to all other Holders; and

                    (ii) as soon as practicable, use its diligent best efforts
          to effect such registration (including, without limitation, the
          execution of an undertaking to file post effective amendments,
          appropriate qualification under applicable blue sky or other state
          securities laws and appropriate compliance with applicable regulations
          issued under the Securities Act) as may be so requested and as would
          permit or facilitate the sale and distribution of all or such portion
          of such Registrable Securities as are specified in such request,
          together with all or such portion of the Registrable Securities of any
          Holder or Holders joining in such request as are specified in a
          written request delivered to the Company within fifteen (15) days
          after receipt of such written notice from the Company.

          Subject to the limitations of Section 3.13, the Company shall file a
registration statement covering the Registrable Securities so requested to be
registered as soon as practicable, after receipt of the request or requests of
the Initiating Holders.

          The registration statement filed pursuant to the request of the
Initiating Holders, may, subject to the provisions of Sections 3.1(b) and 3.2
below, include other securities of the Company which are held by officers or
directors of the Company or which are held by persons who, by virtue of
agreements with the Company, are entitled to include their securities in any
such registration, but the Company shall have no right to include any of its
securities in any such registration except as provided in Sections 3.1(b) and
3.2 below.

          (b) Underwriting.  If the Initiating Holders intend to distribute the
              ------------
Registrable Securities covered by their request by means of an underwriting,
they shall so advise the Company as a

                                       5


part of their request made pursuant to Section 3.1, and the Company shall
include such information in the written notice referred to in Section 3.1(a)(i)
above. The right of any Holder to registration pursuant to Section 3.1 shall be
conditioned upon such Holder's participation in such underwriting and the
inclusion of such Holder's Registrable Securities in the underwriting (unless
otherwise mutually agreed by a majority in interest of the Initiating Holders
and such Holder with respect to such participation and inclusion) to the extent
provided herein. A Holder may elect to include in such underwriting all or a
part of the Registrable Securities he holds.

          If officers or directors of the Company shall request inclusion of
securities of the Company other than Registrable Securities in any registration
pursuant to Section 3, or if holders of securities of the Company who are
entitled by contract with the Company to have securities included in such a
registration (such officers, directors, and other shareholders being
collectively referred to as the "Other Shareholders") request such inclusion,
the Initiating Holders shall, on behalf of all Holders, offer to include the
securities of such Other Shareholders in the underwriting and may condition such
offer on their acceptance of the further applicable provisions of this Rights
Agreement.  All Holders proposing to distribute their securities through such
underwriting shall (together with the Company and Other Shareholders proposing
to distribute their securities through such underwriting) enter into an
underwriting agreement in customary form with the representative of the
underwriter or underwriters (the "Underwriter") selected for such underwriting
by sixty-one percent (61%) of the Initiating Holders and reasonably acceptable
to the Company.  Notwithstanding any other provision of this Section 3.1, if the
Underwriter, in its sole discretion, determines that marketing factors require a
limitation on the number of shares to be underwritten, the Underwriter may
(subject to the allocation priority set forth below) limit the number of
Registrable Securities to be included in the registration and underwriting to
not less than fifty percent (50%) of the securities which Holders have requested
be included therein.  The Company shall so advise all holders of securities
requesting registration, and the number of shares of securities that are
entitled to be included in the registration and underwriting shall be allocated
in the following priority: first, among all Holders of Registrable Securities
(pro rata among such Holders on the basis of all Registrable Securities then
held by such Holders); second, the Company shall be able to include any
securities which it desires to sell for its own account; and third, among all
Other Shareholders in proportion, as nearly as practicable, to the respective
amounts of securities which they had requested to be included in such
registration at the time of filing the registration statement.  If any Holder or
Other Shareholder disapproves of the terms of any such underwriting, such holder
may elect to withdraw therefrom by written notice to the Company and the
Underwriter.  Any Registrable Securities excluded or withdrawn from such
underwriting shall be withdrawn from such registration.

     3.2  Company Registration.
          --------------------

          (a) If the Company shall determine to register any of its securities
either for its own account or for the account of a security holder or holders
exercising their respective demand registration rights, other than a
registration relating solely to employee benefit plans or a registration
relating solely to a Commission Rule 145 transaction or a registration on any
registration form which does not permit secondary sales or does not include
substantially the same information as would be

                                       6


required to be included in a registration statement covering the sale of
Registrable Securities, the Company will:

                    (i) promptly give to each Holder written notice thereof
          (which, to the extent then known and applicable, shall include a list
          of the jurisdictions in which the Company intends to attempt to
          qualify such securities under the applicable blue sky or other state
          securities laws); and

                    (ii) include in such registration (and any related
          qualification under blue sky laws or other compliance), and in any
          underwriting involved therein, all of the Registrable Securities
          specified in a written request or requests made by any Holder within
          fifteen (15) days after receipt of the written notice from the Company
          described in clause (i) above, except as set forth in Section 3.2(b)
          below.  Such written request may specify all or a part of a Holder's
          Registrable Securities.

            (b) Underwriting.  If the registration of which the Company gives
                ------------
notice is for a registered public offering involving an underwriting, the
Company shall so advise the Holders as a part of the written notice given
pursuant to Section 3.2(a)(i).  In such event the right of any Holder to
registration pursuant to Section 3.2 shall be conditioned upon such Holder's
participation in such underwriting and the inclusion of such Holder's
Registrable Securities in the underwriting to the extent provided herein.  All
Holders proposing to distribute their securities through such underwriting shall
(together with the Company and the Other Shareholders distributing their
securities through such underwriting) enter into an underwriting agreement in
customary form with the Underwriter selected for underwriting by the Company.
Notwithstanding any other provision of this Section 3.2, if the Underwriter
determines that marketing factors require a limitation on the number of shares
to be underwritten, and (a) if such registration is the first registered
offering of the Company's securities to the public, the Underwriter may exclude
from such registration and underwriting some (subject to the allocation priority
set forth below) or all of the Registrable Securities and other securities held
by the Holders and the Other Shareholders which would otherwise be underwritten
pursuant hereto, and (b) if such registration is other than the first registered
offering of the sale of the Company's securities to the public, the Underwriter
may (subject to the allocation priority set forth below) limit the number of
securities of the Holders and the Other Shareholders  to be included in the
secondary portion of the registration and underwriting to not less than twenty
percent (20%) of the Registrable Securities which Holders have requested be
included therein.  The Company shall so advise all such Holders and Other
Shareholders requesting registration, and the number of shares of securities
that are entitled to be included in the registration and underwriting shall be
allocated among all such Holders and Other Shareholders as set forth in Section
3.1  If any Holder or Other Shareholder disapproves of the terms of any such
underwriting, he may elect to withdraw therefrom by written notice to the
Company and the Underwriter.  Any Registrable Securities, or other securities
excluded or withdrawn from such underwriting shall be withdrawn from such
registration.

          3.3  Expenses of Registration.  All Registration Expenses incurred in
               ------------------------
connection with any registration, qualification or compliance pursuant to this
Rights Agreement shall be borne by the Company, and all Selling Expenses shall
be borne by the holders of the securities to be registered pro rata

                                       7


on the basis of the number of their shares so registered; provided, however,
that the Company shall not be required to pay any Registration Expenses if, as a
result of the withdrawal of a request for registration by Initiating Holders,
the registration statement does not become effective. If the Company is not
required to pay any Registration Expenses, then the Holders and Other
Shareholders requesting registration shall bear such Registration Expenses pro
rata on the basis of the number of their shares so included in the registration
request, and such registration shall not be considered a registration for
purposes of Section 3.13(b).

          3.4  Registration on Form S-3.  The Company shall use its best efforts
               ------------------------
to qualify for registration on Form S-3, and to that end, the Company shall use
its best efforts to comply with the reporting requirements of the Exchange Act
within six (6) months following the effective date of the first registration of
any securities of the Company for a registered public offering.  After the
Company has qualified for the use of Form S-3, holders of at least thirty
percent (30%) of the outstanding Registrable Securities shall have the right to
request one registration on Form S-3 in each 12-month period (such requests
shall be in writing and shall state the number of shares of Registrable
Securities to be disposed of and the intended method of disposition of such
shares by each such holder), subject only to the following limitations:

          (a) The Company shall not be obligated to cause a registration on Form
S-3 to become effective prior to one hundred and eighty (180) days following the
effective date of a Company-initiated registration (other than a registration
effected solely to qualify an employee benefit plan or to effect a business
combination pursuant to Rule 145), and provided that the Company shall use its
best efforts to achieve such effectiveness promptly following such one hundred
and eighty (180) day period;

          (b) The Company shall not be obligated to cause a registration on Form
S-3 to become effective prior to expiration of one hundred and eighty (180) days
following the effective date of the most recent registration pursuant to a
request by a holder of Registrable Securities under this Rights Agreement or
pursuant to a request by a holder of registration rights under any other
agreement of the Company granting Form S-3 registration rights; provided,
however, that the Company shall use its best efforts to achieve such
effectiveness promptly following such one hundred and eighty (180) day period;

          (c) The Company shall not be required to effect a registration
pursuant to this Section 3.4 unless the Holder or Holders requesting
registration propose to dispose of shares of Registrable Securities having an
aggregate offering price (before deduction of underwriting discounts and
expenses of sale) of at least $1,000,000; and

          (d) The Company shall not be required to maintain and keep any such
registration on Form S-3 effective for a period exceeding ninety (90) days from
the effective date thereof.  The Company shall give notice to all Holders and
all holders of registration rights under any other agreement of the Company
granting Form S-3 or similar registration rights of the receipt of a request for
registration pursuant to this Section 3.4 and shall provide a reasonable
opportunity for all such other

                                       8


holders to participate in the registration. Subject to the foregoing, the
Company will use its best efforts to effect promptly the registration of all
shares of Registrable Securities on Form S-3 to the extent requested by such
holder or holders of Registrable Securities for purposes of disposition. The
Company, non-requesting Holders and Other Shareholders shall have the right to
participate in such registration as provided in Section 3.1 except that in the
event the Underwriter determines that market factors require a limitation on the
number of shares to be underwritten, then shares shall be excluded from such
registration and underwriting pursuant to the allocation method (and subject to
any limitations) described in Section 3.1.

       3.5  Registration Procedures.  In the case of each registration
            -----------------------
effected by the Company pursuant to this Rights Agreement, the Company will keep
each Holder advised in writing as to the initiation of such registration and as
to the completion thereof.  At its expense, the Company will:

          (a) Keep such registration effective for a period of ninety (90) days
or until the Holder or Holders have completed the distribution described in the
registration statement relating thereto, whichever first occurs; and

          (b) Furnish such number of prospectuses and other documents incident
thereto as a Holder from time to time may reasonably request; and

          (c) In connection with any underwritten offering pursuant to a
registration statement filed pursuant to Section 3.1 hereof, the Company will
enter into any underwriting agreement reasonably necessary to effect the offer
and sale of Common Stock, provided such underwriting agreement contains
customary underwriting provisions, and provided further that if the underwriter
so requests the underwriting agreement will contain customary indemnification
and contribution provisions, and provided further that the Underwriter is
reasonably acceptable to the Company.

       3.6  Indemnification.
            ---------------

          (a) To the extent permitted by law, the Company will indemnify each
Holder, and each person controlling such Holder within the meaning of Section 15
of the Securities Act, with respect to which registration, qualification or
compliance has been effected pursuant to this Rights Agreement, against all
expenses, claims, losses, damages and liabilities (or actions in respect
thereof) to which they may become subject under the Securities Act, or the
Exchange Act and other state securities laws, including any of the foregoing
incurred in settlement of any litigation, commenced or threatened, arising out
of or based on any untrue statement (or alleged untrue statement) of a material
fact contained in any registration statement or prospectus, or any amendment or
supplement thereto, incident to any such registration, or any such document,
offering circular or other document incident to such qualification or
compliance, or based on any omission (or alleged omission) to state therein a
material fact required to be stated therein or necessary to make the statements
therein, in light of the circumstances in which they were made, not misleading,
or any violation by the Company of any rule or regulation promulgated under the
Securities Act, the Exchange Act or state securities laws applicable to the
Company and relating to action or inaction required of the Company in connection
with any such registration,

                                       9


qualification or compliance, and will reimburse each such Holder, and each
person controlling such Holder for any legal and any other expenses reasonably
incurred, within three months after a request for reimbursement has been
received by the Company, in connection with investigating, preparing or
defending any such claim, loss, damage, liability or action, provided that the
Company will not be liable in any such case to the extent that any such claim,
loss, damage, liability or expense arises out of or is based on any untrue
statement or omission or alleged untrue statement or omission, made in reliance
upon and in conformity with written information furnished to the Company by an
instrument duly executed by such Holder and stated to be specifically for use
therein, provided, further, that the indemnity agreement contained in this
Section 3.6(a) shall not apply to amounts paid in settlement of any such loss,
claim, damage, liability, or action if such settlement is effected without the
consent of the Company.

          (b) To the extent permitted by law, each Holder will, if Registrable
Securities held by such Holder are included in the securities as to which such
registration, qualification or compliance is being effected, indemnify the
Company, each of its directors and officers and its legal counsel and
independent accountants, each underwriter, if any, of the Company's securities
covered by such a registration statement, each person who controls the Company
or such other person within the meaning of Section 15 of the Securities Act, and
each other such Holder including shares of his Registrable Securities against
all claims, losses, damages and liabilities (or actions in respect thereof) to
which any of the foregoing persons may become subject under the Securities Act,
the Exchange Act and other state securities laws arising out of or based on any
untrue statement (or alleged untrue statement) of a material fact contained in
any such registration statement or prospectus, and any amendment or supplement
thereto, incident to any such registration, or any such document, offering
circular or other document incident to such qualification or compliance, or any
omission (or alleged omission) to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, and
will reimburse the Company, such Holders, such directors, officers, legal
counsel, independent accountants, underwriters or control persons for any legal
or any other expenses reasonably incurred, within three months after a request
for reimbursement has been received by the indemnifying Holder, in connection
with investigating, preparing or defending any such claim, loss, damage,
liability or action, in each case to the extent, but only to the extent, that
such untrue statement (or alleged untrue statement) or omission (or alleged
omission) is made in such registration statement, prospectus, offering circular
or other document in reliance upon and in conformity with written information
furnished to the Company by an instrument duly executed by such Holder and
stated to be specifically for use therein, provided, however, that the indemnity
agreement contained in this Section 3.6(b) shall not apply to amounts paid in
settlement of any such loss, claim, damage, liability or action if such
settlement is effected without the consent of the Holders of sixty-one percent
(61%) in interest, which consent shall not be unreasonably withheld and provided
further that each Holder's liability for indemnification hereunder shall be
limited to the amount of any proceeds received by such Holder from the sale of
securities described in the first sentence of this Section 3.6(b).

          (c) Each party entitled to indemnification under this Section 3.6 (the
"Indemnified Party") shall give notice to the party required to provide
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
has actual knowledge of any claim as to which indemnity may be sought and shall
permit the Indemnifying Party to assume the defense of any such claim or any

                                       10


litigation resulting therefrom, provided that counsel for the Indemnifying
Party, who shall conduct the defense of such claim or litigation, shall be
approved by the Indemnified Party (whose approval shall not be unreasonably
withheld), and the Indemnified Party may participate in such defense at such
party's expense, including any legal fees incurred, and provided further that
the failure of any Indemnified Party to give notice as provided herein shall not
relieve the Indemnifying Party of its obligations under this Rights Agreement,
except to the extent, but only to the extent, that the Indemnifying Party's
ability to defend against such claim or litigation is impaired as a result of
such failure to give notice.  No Indemnifying Party, in the defense of any such
claim or litigation, shall, except with the consent of each Indemnified Party,
consent to entry of any judgment or enter into any settlement which does not
include as an unconditional term thereof the giving by the claimant or plaintiff
to such Indemnified Party of a release from all liability in respect to such
claim or litigation.

          (d) If the indemnification provided for in this Section 3.6 is held by
a court of competent jurisdiction to be unavailable to an indemnified party with
respect to any loss, liability, claim, damage, or expense referred to therein,
then the indemnifying party, in lieu of indemnifying such indemnified party
hereunder, shall contribute to the amount paid or payable by such indemnified
party as a result of such loss, liability, claim, damage, or expense in such
proportion as is appropriate to reflect the relative fault of the indemnifying
party on the one hand and of the indemnified party on the other in connection
with the statements or omissions that resulted in such loss, liability, claim,
damage, or expense as well as any other relevant equitable considerations.  The
relative fault of the indemnifying party and of the indemnified party shall be
determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact relates to information supplied by the indemnifying party or by
the indemnified party and the parties' relative intent, knowledge, access to
information, and opportunity to correct or prevent such statement or omission.

          (e) Notwithstanding the foregoing, to the extent that the provisions
on indemnification and contribution contained in the underwriting agreement
entered into in connection with the underwritten public offering are in conflict
with the foregoing provisions, the provisions in the underwriting agreement
shall control.

          (f) The obligations of the Company and Holders under this Section 3.6
shall survive the completion of any offering of Registrable Securities in a
registration statement under Sections 3.1, 3.2 and 3.4 of this Rights Agreement,
and otherwise.

       3.7  Information by Holder.  Each Holder and each Other Shareholder
            ---------------------
holding securities included in any registration shall furnish to the Company
such information regarding such Holder or Other Shareholder as the Company may
reasonably request in writing and as shall be reasonably required in connection
with any registration, qualification or compliance referred to in this Rights
Agreement.

       3.8  Limitations on Registration of Issues of Securities.  Subject to
            ---------------------------------------------------
Section 5.5,  from and after the date of this Rights Agreement, the Company
shall not enter into any agreement with any

                                       11


holder or prospective holder of any securities of the Company giving such holder
or prospective holder the right to require the Company to initiate any
registration of any securities of the Company, provided that this Section 3.8
shall not limit the right of the Company to enter any agreements with any holder
or prospective holder of any securities of the Company giving such holder or
prospective holder the right to require the Company, upon any registration of
any of its securities, to include, among the securities which the Company is
then registering, securities owned by such holder. Any right given by the
Company to any holder or prospective holder of the Company's securities in
connection with the registration of securities shall be conditioned such that it
shall be consistent with the provisions of this Rights Agreement and with the
rights of the Holders provided in this Rights Agreement.

     3.9  Rule 144 Reporting.  With a view to making available the benefits
          ------------------
of certain rules and regulations of the Commission which may permit the sale of
the Restricted Securities to the public without registration, the Company agrees
to:

          (a) Make and keep public information available as those terms are
understood and defined in Rule 144 under the Securities Act, at all times from
and after ninety (90) days following the effective date of the first
registration under the Securities Act filed by the Company for an offering of
its securities to the general public;

          (b) Use its best efforts to file with the Commission in a timely
manner all reports and other documents required of the Company under the
Securities Act and the Exchange Act at any time after it has become subject to
such reporting requirements;

          (c) So long as a Purchaser owns any Restricted Securities, furnish to
the Purchaser forthwith upon request a written statement by the Company as to
its compliance with the reporting requirements of Rule 144 (at any time from and
after ninety (90) days following the effective date of the first registration
statement filed by the Company for an offering of its securities to the general
public), and of the Securities Act and the Exchange Act (at any time after it
has become subject to such reporting requirements), a copy of the most recent
annual or quarterly report of the Company, and such other reports and documents
so filed as a Purchaser may reasonably request in availing itself of any rule or
regulation of the Commission allowing a Purchaser to sell any such securities
without registration.

     3.10  No-Action Letter or Opinion of Counsel.  Notwithstanding
           --------------------------------------
anything in this Rights Agreement to the contrary, if at any time after the date
of the Company's initial public offering of its securities under the Securities
Act the Company shall have obtained from the Commission a "no-action" letter in
which the Commission has indicated that it will take no action if, without
registration under the Securities Act, any Holder disposes of Registrable
Securities covered by any request for registration made under this Rights
Agreement in the manner in which such Holder proposes to dispose of the
Registrable Securities included in such request, or if in the opinion of counsel
for the Company concurred in by counsel for such Holder no registration under
the Securities Act is required in connection with such disposition, the
Registrable Securities included in such request shall not be eligible for
registration under this Rights Agreement; provided, however, with respect to any
Holder who may deemed to be an "affiliate," as that term is defined under Rule
144, if, notwithstanding the opinion of such counsel, the

                                       12


Holder is unable to dispose of all of the Registrable Securities included in his
request in the manner in which such Holder so proposes without registration, the
Registrable Securities included in such request shall be eligible for
registration under this Rights Agreement.

          3.11  Transfer or Assignment of Registration Rights.  The right to
                ---------------------------------------------
cause the Company to register Registrable Securities granted to a Holder by the
Company under Sections 3.1, 3.2 and 3.4 hereof may be transferred or assigned by
Holder to (i) a transferee or assignee of at least 50,000 shares of Series A
Preferred, Series B Preferred, Series C Preferred, Series D Preferred or Series
E Preferred, or of Common Stock issued pursuant to an conversion of the Series A
Preferred, Series B Preferred, Series C Preferred, Series D Preferred or Series
E Preferred, and (ii) to any constituent partner of a Holder, provided in each
instance that (x) the Company is given written notice by the Holder within two
(2) business days of said transfer or assignment of such Registrable Securities,
stating the name and address of said transferee or assignee and identifying the
securities with respect to which such registration rights are being transferred
or assigned; (y) the transferee or assignee of such rights is not deemed by the
Board of Directors of the Company, in its reasonable judgment, to be a
competitor of the Company; and (z) the transferee or assignee of such rights
assumes in writing the obligations of such Holder under this Rights Agreement.

          3.12  "Market Stand-off" Agreement.  Each Purchaser agrees, if
                ----------------------------
requested by the Company and an underwriter of Common Stock (or other
securities) of the Company, not to sell or otherwise transfer or dispose of any
Common Stock (or other securities) of the Company held by Purchaser during a
period of time determined by the Company and its underwriters (not to exceed 180
days) following the effective date of a registration statement of the Company
filed under the Securities Act with respect to the Company's initial public
offering, provided that all executive officers, directors and holders of five
percent or more of the Company's outstanding capital stock (on a common-
equivalent basis) of the Company who then hold Common Stock (or other
securities) of the Company enter into similar agreements.  Such agreement shall
be in writing in a form satisfactory to the Company and such underwriter.  The
Company may impose stop-transfer instructions with respect to the shares (or
securities) subject to the foregoing restriction until the end of said period.

          3.13  Limitations on Registration Obligations.  The Company shall not
                ---------------------------------------
be obligated to effect, or to take any action to effect, any registration
qualification or compliance pursuant to Sections 3.1, 3.2 or 3.4:

               (a) In any particular jurisdiction in which the Company would be
     required to execute a general consent to service of process in effecting
     such registration, qualification or compliance, unless the Company is
     already subject to service in such jurisdiction and except as may be
     required by the Securities Act; or

               (b) With respect to a registration pursuant to Section 3.1, after
     the Company has effected two (2) such registrations pursuant to Section
     3.1; or

                                       13


               (c) At any time (i) prior to the closing of the initial offering
     to the public of the Company's securities pursuant to a firm commitment
     registered underwriting for the account of the Company (other than an
     offering relating either to the sale of securities to employees of the
     Company pursuant to a stock option, stock purchase or similar plan or a
     Commission Rule 145 transaction) (the "Public Offering") or (ii) following
     the fifth anniversary of the Public Offering, or

               (d) Prior to six (6) months following the effective date of any
     other registration statement relating to an underwritten public offering of
     the Company's securities filed under the Securities Act, or

               (e) If the Company shall furnish to Holders following a request
     for registration a certificate signed by the President of the Company
     stating that in the good faith judgment of the Board of Directors of the
     Company, it would be seriously detrimental to the Company and its
     shareholders for such registration statement to be filed on or before the
     time filing would be required and it is therefore essential to defer the
     filing of such registration statement, the Company shall have the right to
     defer such filing for a period of not more than one hundred twenty (120)
     days after receipt of the request of the Initiating Holders (it being
     understood that the Company shall not have any obligation to take any
     action to register Registrable Securities for which the Company receives
     notice pursuant to Sections 3.1(a) or 3.4 during such 120-day period).


     4.  Additional Covenants.
         --------------------

          4.1  Annual and Quarterly Financial Information.  As long as any
               ------------------------------------------
Purchaser is a holder of at least 100,000 shares of Series A Preferred, Series B
Preferred, Series C Preferred, Series D Preferred, Series E Preferred or shares
of Common Stock issued upon conversion of such shares (as adjusted for any
consolidations, combinations, stock distributions, stock dividends, stock
splits, or similar events), the Company will mail or otherwise deliver to each
such person who will agree to maintain such information in confidence with
standard and reasonable exceptions to such confidentiality:

                    (a) As soon as practicable after the end of each fiscal
          year, and in any event within 90 days thereafter, consolidated balance
          sheets of the Company and its subsidiaries, if any, as of the end of
          such fiscal year, and consolidated statements of income and
          consolidated statements of cash flows of the Company and its
          subsidiaries, if any, for such year, prepared in accordance with
          United States generally accepted accounting principles and setting
          forth in each case in comparative form the figures for the previous
          fiscal year, all in reasonable detail and audited by independent
          public accountants of national standing selected by the Company and
          approved by the Board of Directors.

                                       14


                    (b) As soon as available, and in any event within forty-five
          (45) days after each quarterly accounting period, the Company will
          furnish to each Purchaser quarterly financial statements of the
          Company, including a balance sheet, profit and loss statement, cash
          flow analysis and a comparison to budget.

          4.2  Other Financial Information.  As long as any Purchaser is a
               ---------------------------
holder of at least 200,000 shares of Series A Preferred, Series B Preferred,
Series C Preferred, Series D Preferred, Series E Preferred or shares of Common
Stock issued upon conversion of such shares, the Company will mail or otherwise
deliver to each such person, who will agree to maintain such information in
confidence with standard and reasonable exceptions to such confidentiality

                    (a) Within twenty days following the end of each month,
          monthly financial statements including an income statement, statement
          of cash flows and balance sheet for the prior month, such statements
          will include year to date figures and, a comparison of such figures to
          the Company's budget for each item (with any variances delineated).

                    (b) Within thirty (30) days before the end of each fiscal
          year, a budget, including projected income statement, cash flow and
          balance sheet, on a monthly basis, for the next succeeding fiscal
          year, together with a brief qualitative description of the Company's
          business plan for such year.

          4.3  Termination of Additional Covenants.  The Company's obligations
               -----------------------------------
under this Section 4 will terminate immediately prior to the Public Offering.

     5.  Miscellaneous
         -------------

          5.1  Governing Law.  This Rights Agreement and the legal relations
               -------------
between the parties arising hereunder shall be governed by and interpreted in
accordance with the laws of the State of California.  The parties hereto agree
to submit to the jurisdiction of the federal and state courts of the State of
California with respect to the breach or interpretation of this Rights Agreement
or the enforcement of any and all rights, duties, liabilities, obligations,
powers, and other relations between the parties arising under this Rights
Agreement.

          5.2  Fractional Shares.  Anything in this Rights Agreement
               -----------------
notwithstanding, no fractional shares shall be issuable and the number of shares
of Common Stock to be issued shall be rounded down to the nearest whole number.

          5.3  Entire Agreement.  This Rights Agreement constitutes the full and
               ----------------
entire understanding and agreement between the parties regarding the rights
described herein.  Except as otherwise expressly provided herein, the provisions
hereof shall inure to the benefit of, and be binding upon, the successors,
assigns, heirs, executors and administrators of the parties hereto.

                                       15


          5.4  Notices, Etc.  All notices and other communications required or
               -------------
permitted hereunder shall be in writing and shall be sent by facsimile,
overnight courier service, mailed by first-class mail, postage prepaid, or
delivered either by hand or by messenger, addressed (a) if to a Purchaser, as
indicated on the Schedule of Purchasers attached as Exhibit A to the Series A
                                                    ---------
and B Agreement, the Series C Agreement, the Series D Agreement or the Series E
Agreement, or at such other address and facsimile number as Purchaser shall have
furnished to the Company in writing, or (b) if to the Company, at its address
and facsimile number set forth at the end of this Rights Agreement or at such
other address and facsimile number as the Company shall have furnished to the
Purchasers and each such other holder in writing (with a copy to Judith M.
O'Brien, Wilson Sonsini Goodrich & Rosati, 650 Page Mill Road, Palo Alto,
California 94304, facsimile: (650) 493-6811).

          Each such notice or other communication shall for all purposes of this
Rights Agreement be treated as effective or having been given when delivered if
delivered personally or by messenger, or, if sent by mail, at the earlier of its
receipt or 72 hours after the same has been deposited in a regularly maintained
receptacle for the deposit of the United States mail, addressed and mailed as
aforesaid.

          5.5  Any holder of Series E Preferred who purchases those shares from
the Company pursuant to the Series E Agreement may become a party to this Rights
Agreement after the date hereof without the consent of any of the other parties
hereto by executing a counterpart signature page to this Rights Agreement in the
form attached hereto.

          5.6  Amendments and Waivers.  With the written consent of the record
               ----------------------
or beneficial holders of at least two-thirds of the Registrable Securities, the
obligations of the Company and the rights of the parties under this Rights
Agreement may be waived (either generally or in a particular instance, either
retroactively or prospectively, and either for a specified period of time or
indefinitely), and with the same consent the Company, when authorized by
resolution of its Board of Directors, may enter into a supplementary agreement
for the purpose of adding any provisions to or changing in any manner or
eliminating any of the provisions of this Rights Agreement; provided, however,
that no such modification, amendment or waiver shall reduce the aforesaid
majority of Registrable Securities consent requirement without the consent of
two-thirds of the holders of the Registrable Securities.  Upon the effectuation
of each such waiver, consent, agreement of amendment or modification, the
Company shall promptly give written notice thereof to the record holders of the
Registrable Securities who have not previously consented thereto in writing.
This Rights Agreement or any provision hereof may be changed, waived, discharged
or terminated only by a statement in writing signed by the party against which
enforcement of the change, waiver, discharge or termination is sought, except as
provided in subsection 5.5 and to the extent provided in this subsection 5.6.

          5.7  Counterparts.  This Rights Agreement may be executed in any
               ------------
number of counterparts, each of which shall be an original, but all of which
together shall constitute one instrument.


  [Signature Page to Third Amended and Restated Shareholder Rights Agreement]

                                       16


     IN WITNESS WHEREOF, the parties have executed this Rights Agreement as of
the date first above written.


                              COMPANY:

                              GoDigital Telecommunications, Inc.
                              41305 Albrae Street
                              Fremont, CA  94538

                              By:   /s/ FRANCIS I. AKERS
                                 -------------------------------------------
                                    Francis I. Akers, President


                              PURCHASERS:

                              Menlo Ventures VI, L.P.
                              By:   MV Management VI, L.P.
                              Its:  General Partner

                              By:   /s/ DOUG CARLISLE
                                 -------------------------------------------
                                    General Partner


                              Menlo Entrepreneurs Fund VI, L.P.
                              By:   MV Management VI, L.P.
                              Its:  General Partner

                              By:   /s/ DOUG CARLISLE
                                 -------------------------------------------
                                    General Partner


                              Accel V L.P.
                              By:   Accel V Associates L.L.C.
                              Its:  General Partner

                              By:   /s/ A. SEDMIN
                                 -------------------------------------------
                                    Managing Member


                              Accel Internet/Strategic Technology Fund L.P.
                              By:   Accel Internet/Strategic Technology Fund
                                    Associates L.L.C.
                              Its:  General Partner

                              By:   /s/ A. SEDMIN
                                 -------------------------------------------
                                    Managing Member


                              Accel Investors '96 L.P.

                              By:   /s/ A. SEDMIN
                                 -------------------------------------------
                                    General Partner


                              Accel Keiretsu V L.P.
                              By:   Accel Keiretsu V Associates L.L.C.
                              Its:  General Partner

                              By:   /s/ A. SEDMIN
                                 -------------------------------------------
                                    Managing Member


                              Ellmore C. Patterson Partners

                              By:   /s/ E. PATTERSON
                                 -------------------------------------------
                                    General Partner


                              Gregorio Reyes and Vanessa F. Reyes, Trustees
                              of the Gregorio Reyes and Vanessa F. Reyes Trusts
                              U/D/T dtd 4/22/83, as amended

                              By:   /s/ GREG REYES
                                 -------------------------------------------
                              Name:  Greg Reyes
                                    ----------------------------------------
                              Title: Trustee


                              Stanford University

                              By:  /s/ CAROL GILMER
                                 -------------------------------------------

                                    Carol Gilmer
                                    Gift Administrator, Stanford Management Co.
                                    On behalf of the board of Trustees
                                    Leland Stanford Junior University


                              William Plant and Margaret Beth Plant


                              ----------------------------------------------
                              William Plant

                              ----------------------------------------------
                              Beth Plant


                              Tom Miller

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


                              William F. King and Jackie K. King


                              ----------------------------------------------
                              William F. King

                              ----------------------------------------------
                              Jackie K. King


                              Donald E. Pattison and Cathy Pattison


                              ----------------------------------------------
                              Donald E. Pattison

                              ----------------------------------------------
                              Cathy Pattison


                              Robert B. Wagy and Peggy A. Wagy


                              ----------------------------------------------
                              Robert B. Wagy

                              ----------------------------------------------
                              Peggy A. Wagy



                              JAFCO Co., Ltd.


                              By: /s/ HITOSHI IMUTA
                                  ------------------------------------------
                              Name: Hitoshi Imuta, Chairman
                                    JAFCO America Ventures, Inc.
                                    Its Executive Partner


                              JAFCO G-6(A) Investment Enterprise Partnership

                              By: /s/ HITOSHI IMUTA
                                  ------------------------------------------

                              Name: Hitoshi Imuta, Chairman
                                    JAFCO America Ventures, Inc.
                                    Its Executive Partner


                              JAFCO G-6(B) Investment Enterprise Partnership

                              By: /s/ HITOSHI IMUTA
                                  ------------------------------------------

                              Name: Hitoshi Imuta, Chairman
                                    JAFCO America Ventures, Inc.
                                    Its Executive Partner


                              JAFCO J-S3 Investment Enterprise Partnership

                              By: /s/ HITOSHI IMUTA
                                  ------------------------------------------

                              Name: Hitoshi Imuta, Chairman
                                    JAFCO America Ventures, Inc.
                                    Its Executive Partner


                              JAFCO R-3 Investment Enterprise Partnership

                              By: /s/ HITOSHI IMUTA
                                  -----------------------------------------

                              Name: Hitoshi Imuta, Chairman
                                    JAFCO America Ventures, Inc.
                                    Its Executive Partner


                              JAFCO Co., Ltd.

                              By: /s/ HITOSHI IMUTA
                                  ----------------------------------------

                              Name: Hitoshi Imuta, Chairman
                                    JAFCO America Ventures, Inc.
                                    Its Executive Partner


                              U.S. Information Technology No. 2
                              Investment Enterprise Partnership

                              By: /s/ HITOSHI IMUTA
                                  ----------------------------------------

                              Name: Hitoshi Imuta, Chairman
                                    JAFCO America Ventures, Inc.
                                    Attorney-in-fact


                              CJG Trust

                              By: /s/ M.D. GINSBERG
                                  ---------------------------------------

                              Name: M.D. Ginsberg
                                    -------------------------------------

                              Title: Trustee
                                     ------------------------------------


                              Coral Partners IV, Limited Partnership
                              By:  Coral Management Partners IV,
                                   Limited Partnership
                              Its: General Partner

                                    /s/ YUVAL ALMOG
                              By:   --------------------------------------
                              Name: Yuval Almog
                                    --------------------------------------
                              Title:  General Partner
                                      ------------------------------------


                              Linda L. Watchmaker

                              /s/ LINDA L. WATCHMAKER
                              -----------------------------------------


                              Yuval Almog

                              /s/ YUVAL ALMOG
                              -----------------------------------------


                              Mark C. Headrick

                              /s/ MARK C. HEADRICK
                              -----------------------------------------


                              Peter H. McNermey

                              /s/ PETER H. MCNERMEY
                              -----------------------------------------


                              William Baumel

                              /s/ WILLIAM BAUMEL
                              -----------------------------------------


                              Karen Boezi

                              /s/ KAREN M. BOEZI
                              -----------------------------------------


                              RWI Group II, LP

                              By: /s/ DONALD A. LUCAS
                                  -------------------------------------

                              Name: Donald A. Lucas
                                    -----------------------------------

                              Title: General Partner
                                     ----------------------------------


                              Sevin Rosen Fund IV, L.P.

                              By: SRB Associates IV L.P., its general
                                  partner

                              By: /s/ JOHN JAGGERS
                                  -------------------------------------

                              Name: John Jaggers
                                    -----------------------------------

                              Title: General Partner
                                     ----------------------------------


                              Donald L. Lucas, SUCC TTEE, Donald L. Lucas
                              Profit Sharing Trust dtd 1-1-84

                              By: /s/ DONALD L. LUCAS
                                  -------------------------------------

                              Name: Donald L. Lucas
                                    -----------------------------------

                              Title: Successor Trustee
                                     ----------------------------------


  [Signature Page to Third Amended and Restated Shareholder Rights Agreement]

                                       17