Document:

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                                                                     EXHIBIT 4.4

                               VOTING AGREEMENT

          THIS VOTING AGREEMENT (the "Agreement") is made and entered into as of
October 14, 1999, by and among iBEAM BROADCASTING CORPORATION, a Delaware
corporation (the "Company"), the holders of the Company's Series A Preferred
Stock (the "Series A Stock"), Series B Preferred Stock (the "Series B Stock"),
Series C Preferred Stock ("Series C Stock"), and Series D Preferred Stock (the
"Series D Stock" and together with the Series A, B, and C Stock, the "Preferred
Stock") listed on the Schedule of Investors attached as Schedule A hereto (the
                                                        ----------
"Investors"), and certain holders of Common Stock of the Company (the
"Participating Founders") listed on the Schedule of Participating Founders
attached as Schedule B hereto.  The Company, the Participating Founders and the
            ----------
Investors are individually each referred to herein as a "Party" and are
collectively referred to herein as the "Parties."  The Company's Board of
Directors is referred to herein as the "Board."

                                  WITNESSETH:
                                  ----------

          WHEREAS, certain of the Investors (the "Existing Investors") hold
shares of the Company's Series A Stock, Series B Stock and Series C Stock and/or
shares of Common Stock issued upon conversion thereof;

          WHEREAS, certain Investors (the "New Investors") are parties to the
Series D Preferred Stock Purchase Agreement of even date herewith among the
Company and the New Investors (the "Series D Agreement"), which provides that as
a condition to the closing of the sale of the Series D Stock pursuant thereto,
this Agreement must be executed and delivered by such New Investors, Existing
Investors, the Participating Founders and the Company;

          WHEREAS, the Participating Founders are the beneficial owners of the
number of shares of Common Stock of the Company set forth opposite his/her name
on Schedule B hereto and the Participating Founders and Existing Investors wish
to provide further inducement to the New Investors to purchase shares of Series
D Stock pursuant to the Series D Agreement; and

          WHEREAS, the Company's Restated Certificate of Incorporation provides
that (a) holders of shares of the Company's Series A Stock, voting as a single
class, shall elect one (1) member of the Board (the "Series A Director") and (b)
holders of shares of the Company's Series B Stock, voting together as a single
class, shall elect one (1) member of the Board (the "Series B Director");

          NOW, THEREFORE, in consideration of the mutual promises and covenants
set forth herein, the Company, the Participating Founders and the Investors
hereby agree as follows:

          1.  Agreement to Vote.  Each Investor, as a holder of Preferred Stock,
              -----------------
hereby agrees on behalf of itself and any transferee or assignee of any such
shares of the Preferred Stock, to hold all of the shares of Preferred Stock
registered in its name (and any securities of the Company issued with respect
to, upon conversion of, or in exchange or substitution of the Preferred Stock,
and any other voting securities of the Company subsequently acquired by such
<PAGE>

Investor) (hereinafter collectively referred to as the "Investor Shares")
subject to, and to vote the Investor Shares at a regular or special meeting of
stockholders (or by written consent) in accordance with, the provisions of this
Agreement.  Each Founder, as a holder of Common Stock of the Company, hereby
agrees on behalf of itself and any transferee or assignee of any such shares of
Common Stock, to hold all of such shares of Common Stock and any other
securities of the Company acquired by such Founder in the future (and any
securities of the Company issued with respect to, upon conversion of, or in
exchange or substitution for such securities) (the "Founder Shares") subject to,
and to vote the Founder Shares at a regular or special meeting of stockholders
(or by written consent) in accordance with, the provisions of this Agreement.

          2.   Election of Directors.
               ---------------------

               (a)  In any election of directors of the Company, the Parties
shall each vote at any regular or special meeting of stockholders (or by written
consent) such number of shares of Common Stock and Preferred Stock then owned by
them (or as to which they then have voting power) as may be necessary to elect
one (1) director who shall be the Company's chief executive officer.

               (b)  In any election of directors of the Company, the Parties
holding shares of Series A Stock shall each vote at any regular or special
meeting of stockholders (or by written consent) such number of shares of Series
A Stock then owned by them (or as to which they then have voting power) as may
be necessary to elect one (1) director (the "Series A Director"), nominated by
Crosspoint Venture Partners 1997 ("Crosspoint") so long as Crosspoint owns at
least fifty percent (50%) of the Common Stock issued or issuable upon conversion
of the Series A Stock originally purchased by Crosspoint pursuant to that
certain Series A Preferred Stock Purchase Agreement dated April 16, 1998.

               (c)  In any election of directors of the Company, the Parties
holding shares of Series B Stock shall each vote at any regular or special
meeting of stockholders (or by written consent) such number of shares of Series
B Stock then owned by them (or as to which they then have voting power) as may
be necessary to elect one (1) director (the "Series B Director"), nominated by
Accel Partners and its affiliated funds ("Accel") so long as Accel owns at least
fifty percent (50%) of the Common Stock issued or issuable upon conversion of
the Series B Stock purchased by such Investor pursuant to the Series B Stock
Purchase Agreement dated June 8, 1998.

               (d)  In any election of directors of the Company, the Parties
shall each vote at any regular or special meeting of stockholders (or by written
consent) such number of voting securities of the Company then owned by them (or
as to which they then have voting power) as may be necessary to elect any
additional directors that are approved by a majority of the Board (the "Industry
Directors").

          3.   Removal.  Any director of the Company may be removed from the
               -------
board in the manner allowed by law and the Company's Certificate of
Incorporation and Bylaws, but with respect to a director designated pursuant to
subsections 2(a) through 2(d) above, only upon the vote or written consent of
the majority of the stockholders entitled to designate such director.

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<PAGE>

          4.   Vacancy.  Any vacancy occurring to a director designated pursuant
               -------
to subsections 2(a) through 2(d) above shall only be filled according to the
vote or written consent of the stockholders entitled to designate such director.

          5.   Voting on Certain Transactions.
               ------------------------------

               (a)  Each of Microsoft Corporation, Sony Corporation of America,
Covad Communications Investment Corp. and Covad Communications Group, Inc. ("the
Strategic Investors") shall take such action as may be required so that all
securities of the Company entitled to vote in connection with a Corporate
Transaction (as defined below) beneficially owned by such Investor and/or any of
their controlled affiliates ("Voting Securities") are voted on all Corporate
Transactions in the same manner as voted by a majority of the Board. For
purposes of this Agreement, Corporate Transaction shall mean (i) the acquisition
of the Company by another entity by means of any transaction or series of
related transactions that results in the transfer of fifty percent (50%) or more
of the outstanding voting power of the Company or (ii) the sale of all or
substantially all of the assets of the Company, provided that no transferee of
such voting power or assets is (A) a director, officer or affiliate of the
Company or (B) an associate of such a director, officer or affiliate (with
affiliate and associate having the meaning set forth in Rule 12b-2 under the
Securities Exchange Act of 1934, as amended ("Rule 12b-2"). For purposes of this
Agreement, an entity will be deemed a controlled affiliate of a Strategic
Investor if the Strategic Investor controls such entity within the meaning of
Rule 12b-2.

               (b)  Each Strategic Investor and its controlled affiliates as
holders of shares of Voting Securities, shall be present, in person or by proxy,
at all meeting of stockholders of the Company so that all shares of Voting
Securities beneficially owned by such Strategic Investor and/or its controlled
affiliates may be counted for the purpose of determining the presence of a
quorum at such meetings.

               (c)  Each Investor and its controlled affiliates, as holders of
shares of Voting Securities, shall not exercise any dissenters rights under
applicable law at any time for such Corporate Transactions, if applicable;
provided, however, that if any agreement governing the terms of a Corporate
Transaction requires an Investor to provide an indemnity in connection with the
Investor's transfer or exchange of capital stock in the Company, the terms of
such agreement shall provide that such indemnity shall be provided ratably by
all stockholders of the Company, in proportion to their percentage interest in
the outstanding capital stock of the Company, assuming conversion of all
outstanding Preferred Stock into Common Stock; provided further that the maximum
aggregate dollar amount of the indemnity payable by any Investor shall not
exceed the amount of consideration received by such Investor pursuant to the
terms of the Corporate Transaction.

               (d)  Each Investor and it controlled affiliates, as holders of
shares of Voting Securities, shall refrain from transferring any securities of
the Company, the acquiror, or any other applicable company during any period
prohibited by then applicable pooling of interests accounting treatment rules,
whether before or after the sale of the Company.

               (e)  No Strategic Investor nor any of its controlled affiliates
shall deposit any Voting Securities in a voting trust or subject any Voting
Securities to any

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arrangement or agreement with respect to the voting of such Voting Securities
except for this Agreement.

          6.   Legend on Share Certificates.  Each certificate representing any
               ----------------------------
Shares shall be endorsed by the Company with a legend reading substantially as
follows:

          "The Shares evidenced hereby are subject to a Voting
          Agreement (a copy of which may be obtained upon written
          request from the issuer), and by accepting any interest in
          such shares the person accepting such interest shall be
          deemed to agree to and shall become bound by all the
          provisions of said Voting Agreement."

          7.   Covenants of the Company.  The Company agrees to use its best
               ------------------------
efforts to ensure that the rights granted hereunder are effective and that the
Parties hereto enjoy the benefits thereof.  Such actions include, without
limitation, the use of the Company's best efforts to cause the nomination and
election of the directors as provided above.  The Company will not, by any
voluntary action, avoid or seek to avoid the observance or performance of any of
the terms to be performed hereunder by the Company, but will at all times in
good faith assist in the carrying out of all of the provisions of this Agreement
and in the taking of all such actions as may be necessary, appropriate or
reasonably requested by the holders of a majority of the outstanding voting
securities held by the Parties hereto assuming conversion of all outstanding
securities in order to protect the rights of the Parties hereunder against
impairment.

          8.   No Liability for Election of Recommended Directors.  Neither the
               --------------------------------------------------
Company, the Participating Founders, the Investors, nor any officer, director,
stockholder, partner, employee or agent of such Party, makes any representation
or warranty as to the fitness or competence of the nominee of any Party
hereunder to serve on the Company's Board by virtue of such Party's execution of
this Agreement or by the act of such Party in voting for such nominee pursuant
to this Agreement.

          9.   Grant of Proxy.  Should the provisions of this Agreement be
               --------------
construed to constitute the granting of proxies, such proxies shall be deemed
coupled with an interest and are irrevocable for the term of this Agreement.

          10.  Specific Enforcement.  It is agreed and understood that monetary
               --------------------
damages would not adequately compensate an injured Party for the breach of this
Agreement by any Party, that this Agreement shall be specifically enforceable,
and that any breach or threatened breach of this Agreement shall be the proper
subject of a temporary or permanent injunction or restraining order.  Further,
each Party hereto waives any claim or defense that there is an adequate remedy
at law for such breach or threatened breach.

          11.  Execution by the Company.  The Company, by its execution in the
               ------------------------
space provided below, agrees that it will cause the certificates evidencing the
shares of Common Stock and Preferred Stock to bear the legend required by
Section 6 herein, and it shall supply, free of charge, a copy of this Agreement
to any holder of a certificate evidencing shares of capital stock of the Company
upon written request from such holder to the Company at its principal office.
The parties hereto do hereby agree that the failure to cause the certificates
evidencing the shares

                                       4
<PAGE>

of Common Stock and Preferred Stock to bear the legend required by Section 6
herein and/or failure of the Company to supply, free of charge, a copy of this
Agreement as provided under this Section 6 shall not affect the validity or
enforcement of this Agreement.

          12.  Captions.  The captions, headings and arrangements used in this
               --------
Agreement are for convenience only and do not in any way limit or amplify the
terms and provisions hereof.

          13.  Notices.  Any notice required or permitted by this Agreement
               -------
shall be in writing and shall be sent prepaid registered or certified mail,
return receipt requested, addressed to the other Party at the address shown
below or at such other address for which such Party gives notice hereunder.
Such notice shall be deemed to have been given three (3) days after deposit in
the mail.

          14.  Term.
               ----

               (a)  Except for the provisions of Section 5 hereof, this
Agreement shall terminate and be of no further force or effect upon the earliest
to occur of (i) the consummation of the Company's sale of its Common Stock or
other securities pursuant to a registration statement under the Securities Act
of 1933, as amended, (other than a registration statement relating either to
sale of securities to employees of the Company pursuant to its stock option,
stock purchase or similar plan or a SEC Rule 145 transaction), (ii) the
consummation of the acquisition of the Company by another entity by means of any
transaction or series of related transactions (including, without limitation,
any reorganization, merger or consolidation) that results in the transfer of
fifty percent (50%) or more of the outstanding voting power of the Company or a
sale of all or substantially all of the assets of the Company, (iii) the written
consent of the holders of a majority of the shares held by the Parties hereto,
or (iv) October 12, 2009.

               (b)  The provisions of Section 5 of this Agreement with respect
to each Strategic Investor or Investor shall terminate and be of no further
force or effect upon the later to occur of: (i) the consummation of the sale of
securities pursuant to a bona fide, firmly underwritten public offering of
shares of common stock of the Company registered under the Securities Act of
1933, as amended, or (ii) such Strategic Investor or Investor and its controlled
affiliates in the aggregate own Voting Securities representing less than 5% of
the then outstanding voting power of the Company.

          15.  Manner of Voting.  The voting of shares pursuant to this
               ----------------
Agreement may be effected in person, by proxy, by written consent, or in any
other manner permitted by applicable law.

          16.  Amendments and Waivers.  Any term hereof may be amended and the
               ----------------------
observance of any term hereof may be waived (either generally or in a particular
instance and either retroactively or prospectively) only with the written
consent of the holders of a majority of the then outstanding voting securities
held by the Party or Parties for whose benefit such term has been included in
this Agreement.  Any amendment or waiver so effected shall be binding upon the
Parties hereto.

                                       5
<PAGE>

          17.  Stock Splits, Stock Dividends, etc.  In the event of any issuance
               ----------------------------------
of shares of the Company's voting securities hereafter to any of the Parties
hereto (including, without limitation, in connection with any stock split, stock
dividend, recapitalization, reorganization, or the like), such shares shall
become subject to this Agreement and shall be endorsed with the legend set forth
in Section 5.

          18.  Severability.  Whenever possible, each provision of this
               ------------
Agreement shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement shall be held to be
prohibited by or invalid under applicable law, such provision shall be
ineffective only to the extent of such prohibition or invalidity, without
invalidating the remainder of such provision or the remaining provisions of this
Agreement.

          19.  Binding Effect.  In addition to any restriction on transfer that
               --------------
may be imposed by any other agreement by which any Party hereto may be bound,
this Agreement shall be binding upon the Parties, their respective heirs,
successors and assigns and to such additional individuals or entities that may
become stockholders of the Company and that desire to become Parties hereto;
provided that for any such transfer to be deemed effective, the transferee shall
have executed and delivered an Adoption Agreement substantially in the form
attached hereto as Exhibit A.  Upon the execution and delivery of an Adoption
                   ---------
Agreement by any transferee reasonably acceptable to the Company, such
transferee shall be deemed to be a Party hereto as if such transferee's
signature appeared on the signature pages hereto.  By their execution hereof or
any Adoption Agreement, each of the Parties hereto appoints the Company as its
attorney-in-fact for the purpose of executing any Adoption Agreement which may
be required to be delivered hereunder.

          20.  Governing Law.  This Agreement shall be governed by and construed
               -------------
in accordance with the laws of the State of Delaware, without regard to
conflicts of law principles thereof.

          21.  Entire Agreement.  This Agreement is intended to be the sole
               ----------------
agreement of the Parties as it relates to this subject matter and does hereby
supersede all other agreements of the Parties relating to the subject matter
hereof.

          22.  Counterparts.  This Agreement may be executed in two or more
               ------------
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

          23.  Arbitration.  Any controversy between the Parties hereto
               -----------
involving any claim arising out of or relating to the termination of this
Agreement, will be submitted to and be settled by final and binding arbitration
in Santa Clara, California, in accordance with the then current Commercial
Arbitration Rules of the American Arbitration Association (the "AAA"), and
judgment upon the award rendered by the arbitrators may be entered in any court
having jurisdiction thereof.  Such arbitration shall be conducted by three (3)
arbitrators chosen by the Company, the Investors, and the Participating
Founders, or failing such agreement, an arbitrator experienced in the sale of
similarly-sized companies appointed by the AAA.  There shall be limited
discovery prior to the arbitration hearing as follows: (a) exchange of witness
lists and copies of documentary evidence and documents relating to or arising
out of the issues to be

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<PAGE>

arbitrated, (b) depositions of all party witnesses, and (c) such other
depositions as may be allowed by the arbitrators upon a showing of good cause.
Depositions shall be conducted in accordance with the California Code of Civil
Procedure, the arbitrator(s) shall be required to provide in writing to the
Parties the basis for the award or order of such arbitrator(s), and a court
reporter shall record all hearings, with such record constituting the official
transcript of such proceedings.

                                       7
<PAGE>

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

                              iBEAM BROADCASTING CORPORATION

                              _____________________________________________
                              Peter Desnoes
                              President and Chief Executive Officer

                    Address:  645 Almanor Avenue
                              Suite 100
                              Sunnyvale, CA 94086

                      SIGNATURE PAGE FOR VOTING AGREEMENT

<PAGE>

                              INVESTORS:

                              CROSSPOINT VENTURE PARTNERS 1997

                              _____________________________________________
                              Richard Shapero
                              General Partner

                    Address:  2925 Woodside Road
                              Woodside, CA 94062

                              ACCEL VI L.P.

                              By: Accel VI Associates L.L.C
                                  Its General Partner

                              _____________________________________________
                              Managing Member

                    Address:  428 University Avenue      Accel Partners
                              Palo Alto, CA 94301        One Palmer Square
                              Attn: J. Peter Wagner      Princeton, NJ 08542
                                                         Attn: G. Carter
                                                         Sednaoui

                      SIGNATURE PAGE FOR VOTIN AGREEMENT
<PAGE>

                              ACCEL INTERNET FUND II L.P.

                              By: Accel Internet Fund II Associates L.L.C.
                                  Its General Partner

                    Address:  428 University Avenue      Accel Partners
                              Palo Alto, CA 94301        One Palmer Square
                              Attn: J. Peter Wagner      Princeton, NJ 08542
                                                         Attn: G. Carter
                                                         Sednaoui

                              ACCEL KEIRETSU VI L.P

                              By: Accel Keiretsu VI Associates L.L.C.
                              Its General Partner

                              _____________________________________________
                              Managing Member

                    Address:  428 University Avenue      Accel Partners
                              Palo Alto, CA 94301        One Palmer Square
                              Attn: J. Peter Wagner      Princeton, NJ 08542
                                                         Attn: G. Carter
                                                         Sednaoui

                      SIGNATURE PAGE FOR VOTIN AGREEMENT

<PAGE>

                              ACCEL INVESTORS '98 L.P.

                              By:  Accel Investors '98 Associates L.L.C.
                                   Its General Partner

                              __________________________________________________
                              Managing Member

                    Address:  428 University Avenue         Accel Partners
                              Palo Alto, CA 94301           One Palmer Square
                              Attn: J. Peter Wagner         Princeton, NJ 08542
                                                            Attn: G. Carter
                                                            Sednaoui

                              MEDIA TECHNOLOGY VENTURES, L.P.

                              By:_______________________________________________
                              Title:____________________________________________

                    Address:  1 First Street
                              Los Altos, CA 94022

                              MEDIA TECHNOLOGY VENTURES
                              ENTREPRENEURS FUND, L.P.

                              By:_______________________________________________
                              Title:____________________________________________

                    Address:  1 First Street
                              Los Altos, CA 94022

                      SIGNATURE PAGE FOR VOTING AGREEMENT
<PAGE>

                              ANNABEL J. MONTGOMERY, as Trustee of the ANNABEL
                              MONTGOMERY REVOCABLE TRUST DATED FEBRUARY 7, 1991,
                              and JAMES W. MONTGOMERY, as tenants in common,
                              each as to an undivided one-half interest.

                              __________________________________________________
                              Annabel J. Montgomery, Trustee

                              __________________________________________________
                              James W. Montgomery

                    Address:  100 Wilshire Blvd., Suite 400
                              Santa Monica, CA 90401

                              MONTGOMERY & ASSOCIATES, L.P.

                              By:_______________________________________________
                              Title:____________________________________________

                    Address:  100 Wilshire Blvd., Suite 400
                              Santa Monica, CA 90401

                              CULBARA, INC.

                              By:_______________________________________________
                              Title:____________________________________________

                    Address:  100 Wilshire Blvd., Suite 400
                              Santa Monica, CA  90401

                      SIGNATURE PAGE FOR VOTING AGREEMENT
<PAGE>

                              J.P. MORGAN DIRECT VENTURE CAPITAL
                              INSTITUTIONAL INVESTORS LLC

                              By:_______________________________________________
                              Name:_____________________________________________
                              Title:____________________________________________

                    Address:  522 5/TH/ Avenue.
                              New York, New York 10036

                              J.P. MORGAN DIRECT VENTURE
                              CAPITAL PRIVATE INVESTORS LLC

                              By:_______________________________________________
                              Name:_____________________________________________
                              Title:____________________________________________

                    Address:  522 5/TH/ Avenue.
                              New York, New York 10036

                              INTEL CORPORATION

                              By:_______________________________________________
                              Name:_____________________________________________
                              Title:____________________________________________

                    Address:  2200 Mission College Blvd.
                              Santa Clara, CA 95052-8119

                     SIGNATURE PAGE FOR VOTING AGREEMENT
<PAGE>

                              MICROSOFT CORPORATION

                              By:_______________________________________________
                              Name:_____________________________________________
                              Title:____________________________________________

                    Address:  One Microsoft Way
                              Redmond, WA 98052-6399

                              COVAD COMMUNICATIONS
                              INVESTMENT CORP.

                              By:_______________________________________________
                              Name:_____________________________________________
                              Title:____________________________________________

                              CRESCENDO WORLD FUND LLC

                              By:_______________________________________________
                              Name:_____________________________________________
                              Title:____________________________________________

                              EAGLE VENTURES WF, LLC

                              By:_______________________________________________
                              Name:_____________________________________________
                              Title:____________________________________________

                              LUNN-iBEAM, LLC

                              By:_______________________________________________
                                   LUNN PARTNERS, LLC
                                   Managing Member

                      SIGNATURE PAGE FOR VOTING AGREEMENT
<PAGE>

                              PETER B. DESNOES, IRA A/C
                              774-91015 GUARANTEE & TRUST
                              COMPANY, TTEE

                              __________________________________________________

                              ROBERT C. HAWK

                              __________________________________________________

                    Address:  7585 S. Biscay Street
                              Aurora, CO 80016

                              LEN GROSSI

                              __________________________________________________

                    Address:  5555 Melrose Avenue
                              Hollywood, CA 90038

                              FRED SEEGAL

                              __________________________________________________

                    Address:  31 West 52/nd/ Street
                              27/th/ Floor
                              New York, New York 10019

                      SIGNATURE PAGE FOR VOTING AGREEMENT
<PAGE>

                              WS INVESTMENT COMPANY 99B

                              By:_______________________________________________
                              Name:_____________________________________________
                              Title:____________________________________________

                    Address:  650 Page Mill Road
                              Palo Alto, CA 94304

                              CHRIS DIER

                              __________________________________________________

                              BRUCE D. LAWLER

                              __________________________________________________

                              TOM GILLIS

                              __________________________________________________

                              JEREMY ZULLO

                              __________________________________________________

                              NILS LAHR

                              __________________________________________________

                              DAVID STREHLOW

                              __________________________________________________

                              BOB DAVIS

                              __________________________________________________

                              PHILIP ROSEDALE

                              __________________________________________________

                      SIGNATURE PAGE FOR VOTING AGREEMENT
<PAGE>

                              COMDISCO, INC.

                              By:_______________________________________________
                              Title:____________________________________________

                    Address:  100 Hamilton Ste. 104A   6111 North River Road
                              Palo Alto, CA 94301      Rosemont, IL 60018
                              Attn: Christine Ferra    Attn: Venture Group

                      SIGNATURE PAGE FOR VOTING AGREEMENT
<PAGE>

                              SONY CORPORATION OF AMERICA

                              By:_______________________________________________
                              Name:_____________________________________________
                              Title:____________________________________________

                      SIGNATURE PAGE FOR VOTING AGREEMENT
<PAGE>

                              PARTICIPATING FOUNDERS:

                              WILMOT LIVING TRUST U/D/T dated April 18, 1995

                              __________________________________________________
                              Robert Wilmot, Trustee

                              __________________________________________________
                              Mary J. Wilmot, Trustee

                    Address:  13,333 La Cresta Drive
                              Los Altos, CA 94022

                              __________________________________________________
                              Navin Chaddha

                    Address:  14600 NE 42/nd/ Place, #N-402
                              Bellevue, WA 98007

                      SIGNATURE PAGE FOR VOTING AGREEMENT
<PAGE>

                                  SCHEDULE A

                               LIST OF INVESTORS

     Crosspoint Venture Partners 1997

     Accel VI L.P.

     Accel Internet Fund II L.P.

     Accel Keiretsu VI L.P.

     Accel Investors '98 L.P.

     Media Technology Ventures, L.P.

     Media Technology  Ventures Entrepreneurs Fund, L.P.

     Annabel J. Montgomery
     As Trustee of the Annabel J. Montgomery Revocable Trust
     Dated February 7, 1991 and James W. Montgomery

     Culbara, Inc.

     Montgomery & Associates, L.P.

     J.P. Morgan Direct Venture Capital Institutional Investors, LLC

     J.P. Morgan Direct Venture Capital Private Investors LLC

     Microsoft Corporation

     Covad Communications Investment Corp.

     Crescendo World Fund, LLC

     Eagle Ventures WF, LLC

     Intel Corporation

     Lunn-iBEAM, LLC

     Peter Desnoes, IRA A/C 774-91015 GUARANTEE & TRUST
     COMPANY, TTEE

     Robert C. Hawk

     Len Grossi

                      SIGNATURE PAGE FOR VOTING AGREEMENT
<PAGE>

     Fred Seegal

     WS Investment Company 99B

     Chris L. Dier

     Bruce D. Lawler

     Tom Gillis

     Jeremy Zullo

     Nils Lahr

     David Strehlow

     Philip Rosendale

     Comdisco, Inc.

     Sony Corporation of America

                   SIGNATURE PAGE FOR VOTING AGREEMENT
<PAGE>

                                  SCHEDULE B

                        LIST OF PARTICIPATING FOUNDERS:

WILMOT LIVING TRUST U/D/T dated April 18, 1995
Navin Chaddha
<PAGE>

                                   EXHIBIT A

                              ADOPTION AGREEMENT
                              ------------------

          This Adoption Agreement ("Adoption Agreement") is executed by the
undersigned (the "Transferee") pursuant to the terms of that certain Voting
Agreement dated as of October 13, 1999 (the "Agreement") by and among the
Company and certain of its Stockholders.  Capitalized terms used but not defined
herein shall have the respective meanings ascribed to such terms in the
Agreement.  By the execution of this Adoption Agreement, the Transferee agrees
as follows:

          (a)  Acknowledgment.  Transferee acknowledges that Transferee is
               --------------
acquiring certain shares of the capital stock of the Company (the "Stock"),
subject to the terms and conditions of the Agreement.

          (b)  Agreement.  Transferee (i) agrees that the Stock acquired by
               ---------
Transferee shall be bound by and subject to the terms of the Agreement, and (ii)
hereby adopts the Agreement with the same force and effect as if Transferee were
originally a Party thereto.

          (c)  Notice.  Any notice required or permitted by the Agreement shall
               ------
be given to Transferee at the address listed beside Transferee's signature
below.

          EXECUTED AND DATED this ______ day of _________________, ____.

                                   TRANSFEREE:

                                   By:__________________________________________
                                        Name and Title

                                   Address:_____________________________________
                                   Fax:_________________________________________
Accepted and Agreed:

iBEAM BROADCASTING CORPORATION

By:____________________________
Title:_________________________<PAGE>

                                                                     Exhibit 4.5

                               February 12, 1999

Liberty IB, Inc.
8101 East Prentice Avenue
Suite 500
Englewood, Colorado 80111

          Re: Voting Agreement

Gentlemen:

          This Letter Agreement will confirm our agreement that pursuant to your
purchase of shares of Series C Preferred Stock of iBEAM Broadcasting Corporation
(the Company), Liberty IB, Inc. (Investor) and the Company hereby agree as
follows:

          1.   Investor shall take such action as may be required so that all
securities of the Company entitled to vote in connection with a Corporate
Transaction (as defined below) beneficially owned by Investor, Liberty Media
Corporation and/or any of its controlled affiliates (Voting Securities) are
voted on all Corporate Transactions in the same manner as voted by a majority of
the Board of Directors of the Company. For purposes of this Letter Agreement,
Corporate Transaction shall mean (i) the acquisition of the Company by another
entity by means of any transaction or series of related transactions that
results in the transfer of fifty percent (50%) or more of the outstanding voting
power of the Company or (ii) the sale of all or substantially all of the assets
of the Company, provided that no transferee of such voting power or assets is
(A) a director, officer or affiliate of the Company or (B) an associate of such
a director, officer or affiliate (with affiliate and associate having the
meanings set forth in Rule 12b-2 under the Securities Exchange Act of 1934, as
amended (Rule 12b-2")). For purposes of this Letter Agreement, an entity will be
deemed a controlled affiliate of Investor or Liberty Media Corporation if
Investor or Liberty Media Corporation controls such entity within the meaning of
Rule 12b-2.

               (a) Investor, Liberty Media Corporation and its controlled
affiliates, as holders of shares of Voting Securities, shall be present, in
person or by proxy, at all meetings of stockholders of the Company so that all
shares of Voting Securities beneficially owned by Investor, Liberty Media
Corporation and/or its controlled affiliates may be counted for the purpose of
determining the presence of a quorum at such meetings.
<PAGE>

               (b) Investor, Liberty Media Corporation and its controlled
affiliates, as holders of shares of Voting Securities, shall not exercise any
dissenters rights under applicable law at any time for such Corporate
Transactions, if applicable.

               (c) Investor, Liberty Media Corporation and its controlled
affiliates, as holders of shares of Voting Securities, shall refrain from
transferring any securities of the Company, the acquirer, or any other
applicable company during any period prohibited by then applicable pooling of
interests accounting treatment rules, whether before or after the sale of the
Company.

               (d) None of Investor, Liberty Media Corporation or nor any of its
controlled affiliates shall deposit any Voting Securities in a voting trust or
subject any Voting Securities to any arrangement or agreement with respect to
the voting of such Voting Securities.

          2.   As long as Liberty Media Corporation or Investor, together with
its subsidiaries (defined as entities in which Investor or Liberty Media
Corporation beneficially owns, either directly or indirectly, at least 50% of
the voting securities), in the aggregate own not less than 50% of the shares of
the Series C Preferred Stock that Investor purchased pursuant to the Series C
Stock Purchase Agreement dated as of February 3, 1999 (or an equivalent amount
of Common Stock issued upon conversion thereof), the Company shall invite a
representative of Investor (the Observer) to attend all meetings of its Board of
Directors in a nonvoting observer capacity and, in this respect, shall give such
representative copies of all notices, minutes, consents, and other materials
that it provides to its directors; provided, however, that Investor shall not
make any use whatsoever at any time of such information except to evaluate its
investment in the Company; provided further, that the Observer shall agree to
hold in confidence and trust and to act in a fiduciary manner with respect to
all information so provided; and, provided further, that the Company reserves
the right to withhold any information and to exclude the Observer from any
meeting or portion thereof if access to such information or attendance at such
meeting could (a) adversely affect the attorney-client privilege between the
Company and its counsel; or (b) result in disclosure of confidential or
proprietary information of third parties. In addition, a majority of the
Company's nonemployee directors shall have the right to exclude the Observer
from portions or entire meetings of the Board of Directors or to omit to provide
the Observer with certain information or analysis Which would pose a conflict of
interest for Investor. The Company acknowledges that Investor will likely have,
from time to time, information that may be of interest to the Company
(Information) regarding a wide variety of matters including, by way of example
only, (1) Investor's technologies, plans and services, and plans and strategies
relating thereto, (2) current and future investments Investor has made, may
make, may consider or may become aware of with respect to other companies and
other technologies, products and services, including, without limitation,
technologies, products and services that may be competitive with the Company's,
and (3) developments with respect to the technologies, products and services,
and plans and strategies relating thereto, of other companies, including,
without limitation, companies that may be competitive with the Company. The
Company recognizes that a portion of such Information may be of interest to the
Company. Such Information may or may not be known by the Observer. The Company
agrees that Investor and the Observer shall have no duty to disclose any
Information to the Company or permit the Company to participate in any projects
or investments based on any Information, or to otherwise take advantage of any
opportunity that may be of interest to the Company if it were aware of
<PAGE>

Liberty IB, Inc.
February 12, 1999
Page 3

such Information, and hereby waives, to the extent permitted by law, any claim
based on the corporate opportunity doctrine or otherwise that could limit
Investor's ability to pursue opportunities based on such Information or that
would require Investor or the Investor Observer to disclose any such Information
to the Company or offer any opportunity relating thereto to the Company

          3.   This Letter Agreement constitutes the full and entire
understanding and agreement among the parties with regard to subjects hereof.
Any provision of this Letter Agreement may be amended and the observance thereof
may be waived (either generally or in a particular instance and either
retroactively or prospectively) only with the written consent of the Company and
the Investor.

          4.   Except as otherwise provided herein, the terms and conditions of
this Letter Agreement shall inure to the benefit of and be binding upon the
respective successors and assigns of the parties (including transferees of any
shares of Voting Securities). Nothing in this Letter Agreement, express or
implied, is intended to confer upon any party other than the parties hereto or
their respective successors and assigns any rights, remedies, obligations, or
liabilities under or by reason of this Letter Agreement, except as expressly
provided in this Letter Agreement.

          5.   If one or more provisions of this Letter Agreement are held to be
unenforceable under applicable law, such provision shall be excluded from this
Letter Agreement and the balance of the Letter Agreement shall be interpreted as
if such provision were so excluded and shall be enforceable in accordance with
its terms.

          6.   This Letter Agreement may be executed in two or more
counterparts, each of which shall be. deemed an original, but all of which
together shall constitute one and the same instrument.

          7.   This Letter Agreement shall be governed by and construed under
the laws of the State of California.
<PAGE>

          8.   The agreements set forth in paragraph 1 of this Letter Agreement
shall terminate and be of no further force or effect upon the first to occur of
(a) such time as both of the following conditions shall have been satisfied: (i)
the consummation of the sale of securities pursuant to bona fide, firmly
underwritten public offering of shares of common stock of the Company registered
under the Securities Act of 1933, as amended (the Initial Public Offering); and
(ii) Investor, Liberty Media Corporation and its controlled affiliates in the
aggregate own Voting Securities representing less than 5% of the then
outstanding voting power of the Company and (b) the consummation of a Corporate
Transaction. The agreements set forth in paragraph 2 of this Letter Agreement
shall terminate and be of no further force or effect upon the consummation of
the Initial Public Offering.

          Notwithstanding the provisions set forth in the first sentence of
paragraph 4, the agreements set forth in paragraph 1 and paragraph 2 shall not
be binding upon or inure to the benefit of any transferee (other than Liberty
Media Corporation or a controlled affiliate of Liberty Media Corporation) of
Voting Securities unless such transferee acquires beneficial ownership of Voting
Securities representing 5% or more of the then outstanding voting power of the
Company. For the purposes of the immediately preceding sentence, all shares of
Voting Securities held or acquired by a transferee and by entities or persons
affiliated with a transferee shall be aggregated for the purpose of determining
the applicability of paragraphs 1 and 2 to transferees.

                                 Very truly yours,

                                 iBEAM BROADCASTING CORPORATION

                                 By:  _________________________________
                                 Its: _________________________________

AGREED AND ACCEPTED THIS
12 th DAY OF February, 1999:

LIBERTY IB, INC.

By: /s/ XXX
    ----------------------
Its: Senior Vice President
     ---------------------

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