SIEMENS AKTIENGESELLSCHAFT
SC 13D, 2000-03-27
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                  SCHEDULE 13D
                                  (RULE 13D-1)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)




                                 RADVISION LTD.
                                (Name of Issuer)


                                 ORDINARY SHARES
                         (Title of Class of Securities)

                                   M81869 10 5
                                 (CUSIP Number)

                                 ANDREAS MATTES
                           SIEMENS AKTIENGESELLSCHAFT
                   INFORMATION & COMMUNICATION NETWORKS GROUP
                        HOFMANNSTRASSE 51, D-81359 MUNICH
                           FEDERAL REPUBLIC OF GERMANY
                               011 49 89 722 33980

                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)


                                    COPY TO:

                              KEVIN M. ROYER, ESQ.
                               SIEMENS CORPORATION
                               153 E. 53RD STREET
                            NEW YORK, NEW YORK 10022
                                 (212) 258-4000

                                 MARCH 17, 2000
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule  because of Rule  13d-1(e),  13d-1(f) or 13d-1(g),  check the following
box. |_|


                         (Continued on following pages)

                              (Page 1 of 10 Pages)

NOTE:  Schedules  filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to whom copies are to be sent.




                                       1
<PAGE>


<TABLE>
<CAPTION>
     <S>                                                 <C>                                 <C>
     CUSIP No. M81869 10 5                               13D                                 Page 2 of 10
</TABLE>

<TABLE>
<CAPTION>
<S>          <C>            <C>   <C>                                                                       <C>
    1.       NAME OF REPORTING PERSONS
             I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON (ENTITIES ONLY)
             Siemens Aktiengesellschaft

    2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                                                            (a)|_|
                                                                                                            (b)|_|

    3.       SEC USE ONLY


    4.       SOURCE OF FUNDS
             WC

    5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e)
                                                                                                               |_|

    6.       CITIZENSHIP OR PLACE OF ORGANIZATION

             Federal Republic of Germany

                            7.    SOLE VOTING POWER
       NUMBER OF
         SHARES                   1,625,228
      BENEFICIALLY
        OWNED BY
          EACH
       REPORTING
      PERSON WITH
                            8.    SHARED VOTING POWER

                                  0




                            9.    SOLE DISPOSITIVE POWER
                                  1,625,228

                           10.    SHARED DISPOSITIVE POWER
                                  0


    11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
             1,625,228

    12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
                                                                                                               |_|

    13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                        9.0%

    14.      TYPE OF REPORTING PERSON
              CO

</TABLE>
                                       2
<PAGE>

ITEM 1.           SECURITY AND ISSUER

         The class of equity  securities to which this Statement on Schedule 13D
relates  is the  Ordinary  Shares,  par value NIS 0.1 per share  (the  "Ordinary
Shares"),  of RADVision Ltd. (the "Issuer"),  a corporation  organized under the
laws of  Israel,  with  its  principal  executive  offices  located  at 24 Raoul
Wallenberg St., Tel Aviv 69719, Israel.

ITEM 2.           IDENTITY AND BACKGROUND

         This  statement  is  being  filed  by  Siemens  Aktiengesellschaft,   a
corporation  organized  under  the  laws  of the  Federal  Republic  of  Germany
("Siemens A.G.").

         Siemens A.G. has its principal office at  Wittelsbacherplatz 2, D-80333
Munich,  Federal Republic of Germany.  Siemens A.G.'s principal  business is the
design,  development,  manufacture and marketing of a wide variety of electrical
and electronics systems.

         The directors  and executive  officers of Siemens A.G. are set forth on
Schedules I, attached hereto.  Schedules I sets forth the following  information
with respect to each such person:

          i.   name;

         ii.   business address (or residence address where
               indicated);

        iii.   present principal  occupation or  employment
               and the name, principal business and address
               of any corporation or  other organization in
               which such employment is conducted; and

         iv.   citizenship.

         During the last five years,  neither Siemens A.G., nor any person named
in Schedule I attached  hereto has been (a)  convicted in a criminal  proceeding
(excluding traffic violations or similar misdemeanors) or (b) a party to a civil
proceeding of a judicial or administrative body of competent jurisdiction and as
a result of such  proceeding  was or is subject to a  judgment,  decree or final
order  enjoining  future  violations of, or prohibiting or mandating  activities
subject  to,  federal or state  securities  laws or finding any  violation  with
respect to such laws.


ITEM 3.           SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

         The aggregate  amount of  funds used  by Siemens A.G.  to purchase  the
shares of Ordinary Shares as described in Item 4 hereof was $27,628,876. Siemens
A.G. used funds from its working capital to make the purchase.


ITEM 4.           PURPOSE OF TRANSACTION


                                       3
<PAGE>

         On February 22,  2000,  the Issuer,  Siemens A.G. and certain  existing
shareholders  of the Issuer (the  "Selling  Shareholders")  entered into a Share
Purchase  Agreement (the "Purchase  Agreement"),  pursuant to which Siemens A.G.
agreed to  purchase  (i) 365,767  Ordinary  Shares and (ii)  1,259,461  Ordinary
Shares   (collectively,   the   "Shares")   from  the  Issuer  and  the  Selling
Shareholders, respectively, at a per share purchase price equal to the lesser of
(i) the offering  price per Ordinary  Share to be sold  pursuant to the Issuer's
initial public offering (the "IPO"),  which was effective on March 14, 2000 (the
"Effective  Date"),  and which  offering price was $17.00 per Ordinary Share and
(ii) $17.00 per Ordinary Share.

         Siemens  A.G.  purchased  the  Shares  for the  purpose  of  making  an
investment in the Issuer and not with the present intention of acquiring control
of the  Issuer's  business.  Although  upon  purchase  of the shares of Ordinary
Shares  Siemens  A.G.  obtained  the right to appoint one person to the Issuer's
Board of Directors,  such right will not result in Siemens A.G.  controlling the
Board or the Issuer's business.

         Pursuant to the Purchase Agreement, Siemens A.G. also agreed that prior
to the date which is 270 days after the Effective Date (the "Lockup  Date"),  it
will not,  directly  or  indirectly,  transfer  (other  than  certain  permitted
transfers  to a member of the  Siemens  group) or offer to  transfer  any of the
Shares,  and agreed to enter into an undertaking to that effect addressed to the
underwriters  of the IPO.  Siemens A.G. also agreed that in connection  with any
underwritten  public offering by the Issuer of its equity securities pursuant to
an effective  registration statement filed under the Securities Act, it will not
transfer  or offer to  transfer  any of the  Shares  without  the prior  written
consent  of the Issuer  and its  underwriters.  Such  restriction  (the  "Market
Stand-Off")  shall be in  effect  for such  period  of time  from and  after the
effective  date of the final  prospectus for the offering as may be requested by
the Issuer or such underwriters;  provided, however,  that such Market Stand-Off
shall not exceed 270 days from the closing of the  transactions  contemplated by
the Purchase  Agreement  (the  "Closing"),  which closing  occurred on March 17,
2000.

         Siemens A.G. from time to time may review its  investment in the Issuer
on the basis of various  factors,  including  the Issuer's  business,  financial
condition,  results of operations and prospects,  general  economic and industry
conditions,  the  securities  markets  in  general  and those  for the  Issuer's
securities in particular,  as well as other  developments  and other  investment
opportunities.  Based upon such review,  Siemens A.G.  will take such actions in
the future as Siemens A.G. may deem  appropriate  in light of the  circumstances
existing from time to time. If Siemens A.G. believes that further  investment in
the Issuer is  attractive,  whether  because of the market price of the Issuer's
securities  or  otherwise,  it may acquire  shares of  Ordinary  Shares or other
securities  of the Issuer  either in the open market or in privately  negotiated
transactions  (subject to any applicable  restrictions in the Purchase Agreement
on  Purchaser's   ability  to  purchase   additional   shares  of  the  Issuer's
securities).  Pursuant to the Purchase Agreement,  Siemens A.G. declared that it
will not make a hostile takeover of the Issuer.

         Similarly,  depending  on market and other  factors,  Siemens  A.G. may
determine to dispose of some or all of the shares of Ordinary  Shares  currently
owned by Siemens A.G. or  otherwise  acquired by Siemens A.G. in the open market
or in privately negotiated  transactions (subject to any applicable restrictions
in the  Purchase  Agreement on  Purchaser's  ability to dispose of shares of the
Issuer's securities).


                                       4
<PAGE>

         Except as set forth in this  Item 4 and in Item 6 below,  Siemens  A.G.
has not  formulated  any plans or proposals  which relate to or would result in:
(a) the acquisition by any person of additional  securities of the Issuer or the
disposition  of  securities  of  the  Issuer,  (b)  an  extraordinary  corporate
transaction  involving  the  Issuer  or any of its  subsidiaries,  (c) a sale or
transfer  of a  material  amount  of  the  assets  of the  Issuer  or any of its
subsidiaries,  (d) any change in the present Board of Directors or management of
the Issuer,  (e) any material change in the Issuer's  capitalization or dividend
policy,  (f) any other  material  change in the  Issuer's  business or corporate
structure,   (g)  any  change  in  the  Issuer's  charter  or  bylaws  or  other
instrument's  corresponding  thereto  or  other  action  which  may  impede  the
acquisition  of control of the Issuer by any person,  (h) causing a class of the
Issuer's  securities  to be  deregistered  or  delisted,  (i) a class of  equity
securities of the Issuer  becoming  eligible for  termination of registration or
(j) any action similar to any of those enumerated above.

ITEM 5.           INTEREST IN SECURITIES OF THE ISSUER

                  Siemens A.G. purchased 365,767 shares  newly-issued  shares of
Ordinary Shares from the Issuer and 1,259,461 shares of Ordinary Shares from the
Selling  Shareholders  on March 17,  2000,  for an aggregate  purchase  price of
$27,628,876.  The  Issuer  has  indicated  that as of March 17,  2000 there were
approximately  18,028,596 shares of Ordinary Shares  outstanding,  including the
1,625,228 shares issued to Siemens A.G. Based on that information,  Siemens A.G.
owns approximately 9.0% of the issued and outstanding shares of Ordinary Shares.
Except as described  herein,  neither Siemens A.G. nor any other person referred
to in  Schedule I attached  hereto has  acquired  or  disposed  of any shares of
Ordinary Shares during the past sixty days.

                  Except as otherwise provided in the Voting Agreement,  Siemens
A.G.  has the sole  right to vote or direct  the vote and  dispose or direct the
disposition of all of the Shares.  No other person is known to have the right to
receive or the power to direct the receipt of dividends  from,  or proceeds from
the sale of, any of the Shares.

ITEM 6.           CONTRACTS,  ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
                  RESPECT TO SECURITIES OF THE ISSUER.

         As described in Item 4, Siemens A.G. has purchased  1,625,228 shares of
Ordinary Shares pursuant to the Purchase Agreement.

         The Purchase  Agreement  also provides  that upon the Closing,  Siemens
A.G.  shall be entitled to nominate  one  director on its behalf to the Issuer's
Board of Directors  pursuant to the Voting Agreement entered into by the parties
to the Purchase Agreement (the "Voting Agreement").  Under the Voting Agreement,
Siemens A.G. and the Seller  Shareholders  agreed to vote the Ordinary Shares of
the  Issuer  owned  by  each  of  them  in  favor  of  the   nomination  of  one
representative  of Siemens A.G. to the Board of Directors of the Issuer,  and as
many other representatives of such Seller Shareholders shall indicate (but in no
event less then the number of  representatives  as they had immediately prior to
the IPO). Siemens and the Selling Shareholders also agreed to cause the existing
Board,  and future  Boards,  to nominate for election  such persons in any proxy
statement  and  written  ballot  sent  to the  shareholders  of the  Company  in
connection  with such election or meeting.  The parties to the Voting  Agreement
also  agreed  that in the event that all  Directors,  except  for one  Director,
decide in good faith and

                                       5
<PAGE>

believing  it to be in the best  interests  of the Company and can  substantiate
their decision by reasonable proof that the continuing  presence of any Director
appointed  by a party  pursuant  to Voting  Agreement  may damage  the  business
prospects of the Company, then (i) the right of such Party to appoint a Director
under this  Agreement  shall  immediately  terminate and such Board Member shall
immediately resign from the Board, (ii) the other parties shall be released from
any obligation to vote their Ordinary  Shares in favor of such party's  nominee,
and such party shall be released from its  obligations to vote as well and (iii)
the parties shall take all actions  necessary,  including,  without  limitation,
convening a meeting of shareholders, to effect the removal of such Director from
the Board.

         Pursuant to an Assignment  of  Registration  Rights dated  February 22,
2000  between  Siemens A.G.  and the Selling  Shareholders,  each of the Selling
Shareholders  assigned  to Siemens  A.G.  any and all of its rights to cause the
Issuer to register the shares sold to Siemens  A.G. by such Selling  Shareholder
for trading on any securities  exchange at which the Issuer's shares are trading
and Siemens A.G.  accepted such  assignment and agreed to be bound by all of the
terms and  conditions to which such  shareholder  was bound with respect to such
rights.

         The  description  of certain terms of the Purchase  Agreement set forth
under Item 5 is incorporated in this Item 6 by reference.

         The foregoing description is a summary of certain terms of the Purchase
Agreement and is qualified in its entirety by reference to such document,  which
is attached as Exhibit 1.

ITEM 7.           MATERIAL TO BE FILED AS EXHIBITS.

                  EXHIBIT 1 Share Purchase Agreement dated February 22,
                  2000 between the Issuer, Siemens A.G. and the Selling
                  Shareholders.

                  EXHIBIT 2  Voting Agreement dated March 17, 2000 between
                  the Siemens A.G. and the Selling Shareholders.

                  EXHIBIT 3  Assignment Of Registration Rights dated
                  February 22, 2000 between the Siemens A.G. and the
                  Selling Shareholders.


                                       6
<PAGE>

SIGNATURE


                  After reasonable  inquiry and to the best of our knowledge and
belief,  we certify that the  information  set forth in this  Statement is true,
complete and correct.


March 27, 2000                          SIEMENS AKTIENGESELLSCHAFT



                                        By:  /s/ Andreas Mattes
                                             --------------------
                                        Name:  Andreas Mattes
                                        Title: President, Siemens AG ICN EN


                                       7
<PAGE>

                                   SCHEDULE I


                  The name and  position of each of the  executive  officers and
members of the Managing  Board of Directors of Siemens A.G. are set forth below.
Each of these persons is a Member of the Managing  Board of Directors of Siemens
AG and each of these persons is a citizen of the Federal Republic of Germany.




<TABLE>
<CAPTION>
NAME                                  POSITION  WITH SIEMENS A.G. AND  PRINCIPAL       BUSINESS ADDRESS
                                      OCCUPATION
<S>                                   <C>                                              <C>
Dr. Heinrich von Pierer               President and CEO,                               Wittelsbacherplatz 2
                                      Head of Corporate Planning and Development       D-80333 Munich
                                      Department                                       Federal Republic of
                                                                                       Germany

Dr. Volker Jung                       Special Responsibilities:                        Wittelsbacherplatz 2
                                      Components, Information and                      D-80333 Munich
                                      Communications  Business Segments,               Federal Republic of
                                      Regions Africa, Middle East, C.I.S.              Germany

Mr. Roland Koch                       Head of Information and Communication            Hofmannstrasse 51
                                      Networks Group                                   D-81359 Munich
                                                                                       Federal Republic of
                                                                                       Germany

Dr. Edward G. Krubasik                Special Responsibilities:                        Werner-von-Siemens-Strasse
                                      Industry  and Transportation Business            50
                                      Segments                                         D-91052 Erlangen
                                                                                       Federal Republic of
                                                                                       Germany

Mr. Heinz Joachim Neuburger           Chief Financial Officer                          Wittelsbacherplatz 2
                                      Head of Corporate Finance Department,            D-80333 Munich
                                      Special Responsibilities:                        Federal Republic of
                                      Financial Services                               Germany

Prof. Peter Pribilla                  Head of Corporate Human Resources                Wittelsbacherplatz 2
                                      Department,                                      D-80333 Munich
                                      Special Responsibilities: Region the             Federal Republic of
                                      Americas                                         Germany

</TABLE>

                                       8
<PAGE>

<TABLE>
<CAPTION>
NAME                                  POSITION WITH SIEMENS A.G. AND PRINCIPAL         BUSINESS ADDRESS
                                      OCCUPATION
<S>                                   <C>                                              <C>
Mr. Jurgen Radomski                   Special Responsibilities:                        Werner-von-Siemens-Strasse
                                      Health Care and Lightning Business               50
                                      Segments,                                        D-91052 Erlangen
                                      Region Europe                                    Federal Republic of
                                                                                       Germany

Dr. Claus Weyrich                     Head of Corporate Technology Department          Otto-Hahn-Ring 6
                                                                                       D-81739 Munich
                                                                                       Federal Republic of
                                                                                       Germany

Dr. Gunther Wilhelm                   Special Responsibilities:                        Werner-von-Siemens-Strasse
                                      Energy Business Segments,                        50
                                      Regions Asia, Australia                          D-91052 Erlangen
                                                                                       Federal Republic of
                                                                                       Germany

Dr. Klaus Wucherer                    Head of Automation and Drives Group              Gleiwitzerstrasse 555
                                                                                       D-90475 Nuremberg
                                                                                       Federal Republic of
                                                                                       Germany

</TABLE>

                                       9

<PAGE>

                                  EXHIBIT INDEX



EXHIBIT                                                                 DOC. NO.

Exhibit 1  Share Purchase Agreement dated February 22, 2000 between      EX-99.1
              the Issuer,  Siemens A.G. and the Selling Shareholders.

Exhibit 2  Voting Agreement dated March 17, 2000 between the Siemens     EX-99.2
              A.G. and the Selling Shareholders.

Exhibit 3  Assignment Of Registration Rights dated February 22, 2000     EX-99.3
              between the Siemens A.G. and the Selling Shareholders.


                                       10


                            SHARE PURCHASE AGREEMENT

THIS SHARE PURCHASE AGREEMENT (the "AGREEMENT") is made and entered into on this
22nd-day of February 2000.

BY AND BETWEEN:

(1)    The persons whose names and  addresses are set out in the first column of
       EXHIBIT 1 (the "SELLING SHAREHOLDERS"); and

(2)    SIEMENS Aktiengesellschaft of Hofmannstrasse 51, D-81359, Munich, Germany
       (the "PURCHASER"); and

(3)    RADVision Ltd. of Raoul Wallenberg  Street,  Tel Aviv 69719,  Israel (the
       "COMPANY" and collectively with the Selling Shareholders, the "SELLERS").

WHEREAS:

         The Company has filed a registration statement with the U.S. Securities
         and Exchange  Commission for the purpose of an initial public  offering
         (the "IPO") of its  ordinary  shares,  par value NIS 0.1 per share (the
         "ORDINARY SHARES"); and

II.      The  Purchaser  desires to purchase an aggregate of 1,625,228  Ordinary
         Shares (the  "SHARES") from the Selling  Shareholders  and the Company,
         subject to and in accordance  with the terms and  conditions  set forth
         herein; and

III.     The Selling  Shareholders  desire to sell to the Purchaser 1,259,461 of
         the Shares (the "SELLING SHAREHOLDERS' SHARES") and the Company desires
         to  sell  to the  Purchaser  365,767  of  the  Shares  (the  "COMPANY'S
         SHARES"),  in each case subject to the terms and  conditions  set forth
         herein.

NOW, THEREFORE, THE PARTIES HEREBY AGREE AS FOLLOWS:

1.  PREAMBLE AND DEFINITIONS

    1.1. The  preamble to this Agreement and the exhibits and schedules attached
         hereto form an integral part of this Agreement.

    1.2. In  this Agreement and in the exhibits and schedules hereto, unless the
         context otherwise requires, the following terms shall bear the meanings
         set forth opposite them:

<PAGE>

             "Closing"                     The consummation of the  transactions
                                           contemplated  by  this  Agreement  as
                                           provided in Section 3.


             "Registration Statement"      The Company's  Registration Statement
                                           on  Form F-1  (File  No. 333-  ),  as
                                           amended,  initially  filed  with  the
                                           U.S.   Securities     and    Exchange
                                           Commission   on   February  __,  2000
                                           attached hereto as SCHEDULE 1.1.

2.  SALE AND PURCHASE OF SHARES

    2.1. Subject to the terms and conditions of this Agreement, (i) the Selling
         Shareholders  agree to sell to the Purchaser, and the Purchaser agrees,
         upon the basis of the representations and warranties  contained herein,
         to purchase from the Selling  Shareholders, the  Selling  Shareholders'
         Shares  free and clear of any pledges, encumbrances, attachments or any
         other  third  party  rights  of  any  nature  whatsoever;  and (ii) the
         Company  agrees  to sell to the  Purchaser,  and the Purchaser  agrees,
         upon the basis of  the representations and warranties contained herein,
         to purchase from the Company,  the Company's  Shares free and clear  of
         any pledges, encumbrances, attachments or any other third  party rights
         of any nature whatsoever;  all of the Shares having all of  the rights,
         preferences,  privileges  and  restrictions  set  forth in  the form of
         amended Articles of Association of the Company  (the "New Articles") to
         be adopted  immediately  prior to  the  closing  of the IPO;  provided,
         that,  notwithstanding  anything  herein  to the contrary,  the Sellers
         shall not be obligated to sell the Shares  to the Purchaser  unless the
         Purchaser  purchases all 1,625,228  Shares  and the Purchaser shall not
         be  obligated  to buy the Shares from the  Sellers  unless  the Sellers
         sell all  1,625,228  Shares.  The  Purchase  and sale of the  Shares is
         intended to be a private  placement and not a public  offering  or part
         of a public offering.

    2.2. Each  of the Selling  Shareholders  hereby waives,  with respect to the
         Shares  to  be sold to the  Purchaser  hereunder,  any  right  of first
         refusal,  pre-emption  or  any other right which may be conferred on it
         by the  Articles of  Association  of  the Company in effect on the date
         hereof, by any agreement relating to the Ordinary Shares or otherwise.

    2.3. To  the extent that any of the Selling  Shareholders  holds Shares as a
         trustee  for  others,  it  shall  be the  responsibility  of each  such
         Selling  Shareholder  to procure  all releases  and/or waivers from all
         persons for whom such Selling  Shareholder  holds such Shares in trust.
         The Selling  Shareholders will deliver at the  Closing evidence of such
         release or waiver in a form reasonably satisfactory to the Purchaser.

3.  CLOSING

    3.1. The  purchase  and  sale of the Shares  shall be held at the  Company's
         offices on  Raoul Wallenberg  Street,  Tel Aviv, on the business day of
         the  closing  of  the IPO at 15:00  (local  time) or,  if  later,  upon
         satisfaction  or waiver by the parties hereto of each of the conditions
         set  forth  in  Section  4 (such  date,  the  "Closing  Date").  At the
         Closing,  the  following  transactions  shall occur, which transactions
         shall be deemed  to take place simultaneously and none of them shall be
         completed  or deemed to be completed until all shall have occurred:

                                       2
<PAGE>

              3.1.1  Each of the Selling  Shareholders shall execute and deliver
                     to the Company a share  transfer deed, in the form required
                     to  effect  the  transfer  of the  number  of  the  Selling
                     Shareholders'  Shares  set  forth  opposite  their  name on
                     Exhibit 2.1 hereto.

              3.1.2  Each  of the  Selling  Shareholders  shall  deliver  to the
                     Company  its old share  certificate  or  certify in writing
                     that he lost such share  certificate  or the Company  shall
                     declare that a share  certificate  was never issued to such
                     Selling Shareholder.

              3.1.3  The Company shall deliver to the  Purchaser,  to be held in
                     escrow  by the  Escrow  Agent as  defined  below  until all
                     Closing conditions have been fulfilled, a certified copy of
                     a  resolution  of the  Board of  Directors  of the  Company
                     issuing  and  allotting   the   Company's   Shares  to  the
                     Purchaser,  together with a duly  completed  notice of such
                     issuance to the Israel  Registrar  of Companies in form and
                     substance  acceptable for immediate  filing with the Israel
                     Registrar of Companies.
              3.1.4  The Company shall register the Purchaser in its register of
                     shareholders  as the owner of the Shares and shall have the
                     American  stock  transfer  agent  issue to the  Purchaser a
                     validly executed share certificate  representing the Shares
                     within three (3) business days of the Closing.

              3.1.5  The Company  shall delive  to the Purchaser, to be held in
                     escrow by the  Escrow  Agent as  defined  below  until  all
                     Closing  conditions  have been  fulfilled,  a duly executed
                     certificate  of  confirmation  from  the  Secretary  of the
                     Company  certifying  that  the  Purchaser  has  been  duly
                     registered in the registry of shareholders  of  the Company
                     as the owner of the Shares.

              3.1.6  Each  of  the  Selling  Shareholders,  the  Company and the
                     Purchaser  shall  deliver  to the  other  Parties a written
                     confirmation  attesting that  all of  the  representations,
                     warranties and  undertakings provided  by it this Agreement
                     are true,  correct and effective  on and as of  the Closing
                     Date.

              3.1.7  In  consideration  for  the  Shares,  the  Purchaser  shall
                     deposit  with the Escrow Agent (as defined  hereunder)  for
                     the benefit of the Sellers the  Purchase  Price (as defined
                     hereunder)  less any tax which is  required  to be withheld
                     pursuant to law, to be  transferred  to the Escrow  Agent's
                     bank  account  [details  of which  shall be provided to the
                     Purchaser in writing at least 5 business  days prior to the
                     Closing  Date],  in readily  available  liquid funds,  such
                     funds shall be credited to such account immediately by bank
                     transfer executed at the Closing.

                     For purposes of this Agreement,  the "PURCHASE PRICE" shall
                     equal the number of the  Shares  (transferred  and  issued)
                     multiplied  by the Per Share  Purchase  Price  (as  defined
                     hereinafter).  The "PER SHARE  PURCHASE  PRICE" shall equal
                     the per share price of the Company's  Ordinary Shares to be
                     offered  to the  public  in the  IPO  prior  to any  public
                     trading,   excluding   any   underwriting   discounts   and
                     commissions, provided that in no event shall the Per Share
                     Purchase Price exceed U.S.$17.00.


                                       3
<PAGE>

    3.2.  The Sellers hereby  irrevocably  appoint  Advocate  Israel  Kantor  as
          trustee (the "ESCROW AGENT") to receive the Purchase  Price due by the
          Purchaser to the Sellers  hereunder.  The Escrow Agent shall  transfer
          the  Purchase  Price to RAD Data  Communications  Ltd.  (the  "Payment
          Agent") once all of the Closing  conditions have been  fulfilled.  The
          Sellers confirm and acknowledge that payments made by the Purchaser or
          the Escrow Agent to the Payment Agent and  acknowledged as received by
          the Payment Agent shall constitute good and sufficient receipt of such
          payments as if the payments  were made  directly to the  Sellers.  The
          Purchaser  and  Escrow  Agent  shall  have no  responsibility  for the
          allocation  by the Payment  Agent among the Sellers of any sum paid by
          the Purchaser or the Escrow Agent to the Payment Agent.

    3.3.  For the  avoidance  of doubt  and  without  derogating  from any other
          documents and  agreements  which may exist between the parties,  it is
          hereby  clarified  that the  Purchase  Price to be paid at the Closing
          shall  be full  and  complete  consideration  for the  Shares  and the
          Sellers, or any of them, shall not be entitled to any other payment of
          any nature whatsoever with respect to the Shares.

4.  CLOSING CONDITIONS

    4.1.  The  obligation  of the  Purchaser to purchase the Shares,  and of the
          Sellers to sell the  Shares,  at the  Closing  shall be subject to the
          satisfaction  or waiver of the  following  conditions  precedent on or
          prior to the Closing Date:

          4.1.1.   The Voting Agreement among the Purchaser  and  certain of the
               Selling  Shareholders,  in the form  attached  hereto as  Exhibit
               4.1.1 (the  "Voting  Agreement"),  shall have been  executed  and
               delivered by all the parties thereto.

          4.1.2.   The Umbrella License Agreement  between the  Company  and the
               Purchaser  in the form  attached  hereto as  Exhibit  4.1.2  (the
               "License  Agreement"),  shall have been executed and delivered by
               all the parties thereto.

          4.1.3.   The execution and the  delivery of  this  Agreement  and  the
               consummation of the transactions  contemplated  hereby shall have
               been approved by the following  regulatory  authorities:  (i) the
               Investment  Center of the Israeli  Ministry of Industry and Trade
               and (ii) the Office of the Chief  Scientist  of the  Ministry  of
               Industry and Trade.

          4.1.4.   The closing of the IPO of the Company's Ordinary Shares shall
               have occurred.

          4.1.5.   All documents to be delivered by the  Company and the Selling
               Shareholders pursuant to Section 3 above shall be delivered.

          4.1.6.   The New Articles shall have been duly adopted.


                                       4

<PAGE>

5.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY The Company hereby  represents
    and warrants to the Purchaser as follows:

    5.1.  ORGANIZATION  AND GOOD  STANDING.  The Company is a  corporation  duly
          organized, validly existing and in good standing under the laws of the
          State of Israel and has all requisite corporate power and authority to
          carry on its business as now conducted.

    5.2.  AUTHORIZATION. All corporate action on the part of the Company and its
          officers,  directors and shareholders necessary for the authorization,
          execution  and  delivery of this  Agreement,  the  performance  of the
          obligations of the Company hereunder and the  authorization,  issuance
          and delivery of the  Company's  Shares has been taken or will be taken
          prior to the Closing.  Except as set forth in Section 4.1.3 hereof, no
          consent, approval, order, license, permit, action by, or authorization
          of or  designation,  declaration,  or  filing  with  any  governmental
          authority,  domestic or foreign,  is required in  connection  with the
          valid  execution,  delivery and  performance  of this Agreement or the
          offer, sale and/or issuance of the Shares.

    5.3.  BINDING  EFFECT.  This  Agreement  constitutes  a  valid  and  binding
          agreement  of  the  Company,   enforceable   against  the  Company  in
          accordance with its terms.

    5.4.  NO  CONFLICTS.  The  execution  and  delivery of this  Agreement,  the
          consummation  of  the   transactions   contemplated   hereby  and  the
          compliance  with the terms and  provisions  hereof  will not  conflict
          with,  result in a breach or  violation  of, or  constitute  a default
          under  (i)  the  Company's  Memorandum  of  Association,  and  the New
          Articles; (ii) any contract,  agreement,  lease, license or commitment
          to which the Company is a party or to which it is  subject;  (iii) any
          judgment,  order,  injunction,  decree  or  ruling  of  any  court  or
          governmental  authority,  domestic or foreign, to which the Company is
          subject; and/or (iv) applicable law.

    5.5.  COMPANY'S  SHARES.  The  Company's  Shares,   when  issued,  sold  and
          delivered in  accordance  with the terms hereof for the  consideration
          expressed,   will  be  duly  and  validly   issued,   fully  paid  and
          nonassessable.  Furthermore,  the Company's Shares, when issued, shall
          be free and clear of any  pledges,  encumbrances,  attachments  or any
          other third party rights of any nature whatsoever.

    5.6.  EXEMPTION FROM REGISTRATION.  Assuming the accuracy of the Purchaser's
          representations  set forth in Section 7 hereof,  the  offer,  sale and
          issuance of the Company's  Shares to the Purchaser on the Closing Date
          as  contemplated  by this  Agreement are exempt from the  registration
          requirements   of  the   Securities  Act  of  1933,  as  amended  (the
          "SECURITIES ACT").

    5.7.  DISCLOSURE.  On the Closing Date, the Registration Statement: (i) does
          not include any untrue  statement of a material fact or omits to state
          any material fact  required to be stated  therein or necessary to make
          the statements therein, in light of the circumstances under which they
          were made, not misleading.

    5.8.  ACCOUNTANTS  AND  FINANCIAL  STATEMENTS.  The   accountants  who  have
          certified or shall certify the financial  statements  filed or  to  be
          filed with the  Securities and  Exchange Commission  as  part  of  the
          Registration Statement are independent  accountants as are required by
          the Securities Act. The consolidated  financial statements  (including
          all related notes and  schedules) of the


                                       5
<PAGE>

          Company and its subsidiaries contained in the  Registration  Statement
          are complete and correct and fairly present the financial position and
          results of  operations  of the  Company  and its  subsidiaries  at the
          respective  dates and for the respective  periods to which they apply.
          Such  financial  statements  have been  prepared  in  accordance  with
          generally  accepted  principles  of  accounting  consistently  applied
          throughout the periods involved.

    5.9.  TAX REPORTS AND LIABILITY.  The  Company has  timely complied with all
          requirements pertaining to the filing of  tax returns  and tax reports
          and supplied the tax authorities with all required  documentation  and
          information.  The  Company  has duly and timely paid in full all taxes
          shown as due on such  returns and  reports,  except for such  untimely
          payment that would not have a material  adverse effect on the Company,
          or to the  extent  such  taxes  are  accrued  but  not  yet  due,  has
          adequately  reserved for the timely  payment of any and all such taxes
          when due.  The  Company is unaware  of any  unpaid  tax  liability  or
          potential  tax  liability of the Company  pertaining  to any period or
          event prior to the date of the execution of this Agreement.

6.   REPRESENTATIONS  AND  WARRANTIES  OF THE SELLING  SHAREHOLDERS  Each of the
     Selling  Shareholders  hereby  represents  and warrants to the Purchaser as
     follows:

     6.1. ORGANIZATION AND GOOD STANDING. Such Seller is a corporation,  limited
          partnership  or  limited  liability  company,   as  applicable,   duly
          organized, validly existing and in good standing under the laws of its
          jurisdiction of organization.

     6.2. AUTHORIZATION.  All corporate  action on the part of such Seller,  and
          its   officers,   directors   and   shareholders   necessary  for  the
          authorization,   execution  and  delivery  of  this   Agreement,   the
          performance  of all  obligations  of such  Seller  hereunder,  and the
          transfer and delivery of such  Selling  Shareholders'  Shares has been
          taken or will be taken prior to the Closing.

     6.3. BINDING  EFFECT.  This  Agreement  constitutes  a  valid  and  binding
          agreement  of  such  Selling  Shareholder,  enforceable  against  such
          Selling Shareholder in accordance with its terms.

     6.4. NO  CONFLICTS.  The  execution  and  delivery of this  Agreement,  the
          consummation  of  the   transactions   contemplated   hereby  and  the
          compliance  with the terms and  provisions  hereof  will not  conflict
          with,  result in a breach or  violation  of, or  constitute  a default
          under (i) such Selling Shareholders' organizational documents; or (ii)
          any  contract or  agreement  to which such  Selling  Shareholder  is a
          party,  except in the case of clause (ii) for such  conflict,  breach,
          violation or default which would not have a material adverse effect on
          such Selling Shareholders' business, financial condition or results of
          operations.

     6.5. REGISTRATION STATEMENT.  Such Selling Shareholder is familiar with the
          Registration  Statement  and has no knowledge  of any  material  fact,
          condition or information not disclosed in the  Registration  Statement
          which has materially  adversely  affected or may materially  adversely
          affect the business of the Company or any of its subsidiaries; and the
          sale  of the  Selling  Shareholders'  Shares  owned  by  such  Selling
          Shareholder  pursuant  hereto  is  not  prompted  by  any  information
          concerning  the  Company or any of its  subsidiaries  which is not set
          forth in the Registration Statement.


                                       6

<PAGE>

     6.6. TITLE.  Such  Seller is the record  owner of the number of the Selling
          Shareholders'  Shares  set  forth  opposite  the name of such  Selling
          Shareholder on Exhibit 2.1 hereto and has good and marketable title to
          such Shares, free and clear of any pledges, encumbrances,  attachments
          or any other third party right of any nature  whatsoever  with respect
          to such Shares.


7.   REPRESENTATIONS  AND  WARRANTIES  OF THE  PURCHASER  The  Purchaser  hereby
     represents and warrants to each of the Sellers as follows:

     7.1. ORGANIZATION  AND GOOD STANDING.  The Purchaser is a corporation  duly
          organized,  validly  existing and in good  standing  under the laws of
          Germany.

     7.2. AUTHORIZATION.  All corporate action on the part of the Purchaser, and
          its officers, directors and shareholders necessary for the purchase of
          the Shares  pursuant  to this  Agreement  and the  performance  of its
          obligations  hereunder  has been  taken or will be taken  prior to the
          Closing.

     7.3. BINDING  EFFECT.  This  Agreement  constitutes  a  valid  and  binding
          agreement  of the  Purchaser,  enforceable  against the  Purchaser  in
          accordance with its terms.

     7.4. NO  CONFLICTS.  The  execution  and  delivery of this  Agreement,  the
          consummation  of  the   transactions   contemplated   hereby  and  the
          compliance  with the terms and  provisions  hereof  will not  conflict
          with,  result in a breach or  violation  of, or  constitute  a default
          under  (i) the  Purchaser's  organizational  documents;  and  (ii) any
          contract or  agreement  to which the  Purchaser is a party,  except in
          the case of  clause  (ii)  for such  conflict,  breach,  violation  or
          default  which  would  not  have  a  material  adverse  effect  on the
          Purchaser's business, financial condition or results of operations.

     7.5. PURCHASE  ENTIRELY  FOR OWN  ACCOUNT.  The Shares will be acquired for
          investment for the Purchaser's own account, not as a nominee or agent,
          and not with a view to the  immediate  resale or  distribution  of any
          part thereof,  and the Purchaser has no present  intention of selling,
          granting any participation in, or otherwise distributing the Shares.

     7.6. AVAILABLE  INFORMATION.  The  Purchaser  has  received  the  following
          information:  the Registration Statement, audited financial statements
          for the year ending  December  31, 1999  included in the  Registration
          Statement  and the  Business  Plan for Year 2000  prior to making  its
          decision to purchase the Shares.

     7.7. INVESTMENT EXPERIENCE.  The Purchaser is experienced in evaluating and
          investing in securities  of companies in the software and  information
          technology  industry.  and  acknowledges  that it is able to fend  for
          itself,  can bear the economic  risk of the  investment in the Shares,
          and has such  knowledge  and  experience  in  financial  and  business
          matters that it is capable of  evaluating  the merits and risks of the
          investment in the Shares.  The Purchaser has not been organized solely
          for the purpose of acquiring the Shares.

     7.8. ACCREDITED INVESTOR.  The Purchaser is  an  "accredited investor,"  as
          that  term is  defined in  Rule 501  of Regulation D of the Securities
          Act.

                                       7
<PAGE>

     7.9. PURCHASER  NOT A U.S.  PERSON.  The  Purchaser is not a "U.S.  Person"
          within the meaning of Rule 902(k) of  Regulation  S of the  Securities
          Act.

     7.10. PURCHASE MADE IN AN "OFFSHORE  TRANSACTION" WITH "NO DIRECTED SELLING
          EFFORTS  WITHIN THE UNITED  STATES." The Purchaser was not  physically
          present in the United States when the Purchaser was offered the Shares
          and the offer was not  accompanied  by any form of  advertising in the
          United States or other  "directed  selling  efforts" within the United
          States  within  the  meaning  of Rule  902(c) of  Regulation  S of the
          Securities Act.

     7.11. BROKERAGE COMMISSIONS.  No  broker's  commissions  were,  or  will be
          required  to  be,  paid  by  the  Purchaser  in connection  with  this
          transaction.

8.   REGISTRATION RIGHTS AND STAMP DUTY

     8.1      The  Selling  Shareholders  shall  assign  to  the  Purchaser  the
              registration  rights  attached  to the Shares  sold by them.  Said
              assignment shall be effectuated at the Closing.

     8.2      The Company shall pay the stamp duty  due on the  issuance  of the
              Company's Shares.

9.   COVENANTS OF THE PURCHASER

     9.1. LOCK UP.  Prior to the date which is 270 days after the closing of the
          IPO  (the  "LOCKUP  DATE"),  the  Purchaser  shall  not,  directly  or
          indirectly,  Transfer (as  defined below)  or offer to Transfer any of
          the Shares, and the Purchaser shall sign an undertaking  addressed  to
          the underwriters  in the form set forth in Exhibit 8.1 to such effect.
          In order to enforce the transfer  restrictions  set forth in the prior
          sentence,  the  Company  may impose  stop-transfer  instructions  with
          respect  to the  Shares  until  the  Lockup  Date.  As  used  in  this
          Agreement,   the  term  "TRANSFER"  shall  mean  any  sale,  transfer,
          assignment,  hypothecation,  encumbrance or other disposition, whether
          voluntary or involuntary,  of any of the Shares, except for a transfer
          to a member of the Siemens Group provided that the transferre shall be
          bound by all  obligations  under this  Agreement,  including,  but not
          limited to Exhibit 8.1. In the case of a  hypothecation,  the Transfer
          shall be deemed to occur both at the time of the initial pledge and at
          any pledgee's sale or a sale by any secured creditor or a retention by
          the  secured  creditor  of the  pledged  Shares in complete or partial
          satisfaction of the indebtedness for which the Shares are security.

     9.2. MARKET STAND-OFF.  In addition to the transfer  restrictions set forth
          in Section 8.1 (which shall in no way be limited by the following), in
          connection with any underwritten public offering by the Company of its
          equity  securities  pursuant to an  effective  registration  statement
          filed under the  Securities  Act, the Purchaser  shall not Transfer or
          offer to Transfer any of the Shares without the prior written  consent
          of the Company and its  underwriters.  Such  restriction  (the "Market
          Stand-Off")  shall be in effect for such period of time from and after
          the effective date of the final  prospectus for the offering as may be
          requested by the Company or such underwriters; provided, however, that
          such Market  Stand-Off shall not exceed 270 days from the Closing.  In
          order  to  enforce  the  Market  Stand-Off,  the  Company  may  impose
          stop-transfer instructions with respect to the Shares until the end of
          the applicable stand-off period.

     9.3. The Purchaser hereby declares that it will not make a hostile takeover
          of the Company.

                                       8

<PAGE>

     9.4. LEGAL  OBLIGATIONS.  Immediately  after  the  Closing,  the  Purchaser
          undertakes to file all the necessary documents and reports required to
          be filed by the Purchaser by any relevant authority, in Israel, the US
          or elsewhere,  and to abide by all the appropriate rules,  regulations
          and laws  applying  to a foriegn  equity  holder,  including,  without
          limitation,  undertaking  towards  the  Office of Chief  Scientist  to
          comply  with the  Research  and  Development  Law and timely  filing a
          Schedule 13D  reporting  the  acquisition  of  securities  of a public
          company with the US Securities and Exchange Commission.

     9.5. RIGHT TO A DIRECTOR  AND  VOTING  AGREEMENT.  Upon  the  Closing,  the
          Purchaser shall be entitled to nominate one  director on his behalf to
          the Company's Board of Directors by  way  of a voting  agreement.  The
          Board of Directors meetings, and the minutes thereof, shall  be in the
          English  language.  Directors  of the Company and of its  subsidiaries
          shall be entitled  to attend  meetings  of the Board of  Directors  by
          means  of a  conference  call,  videoconference  or  similar  means of
          telecommunication  which ensure that all  participating  directors are
          able to hear each other simultaneously.  The Purchaser and the Sellers
          listed on  Schedule 7 hereto  agree to enter into an  agreement  under
          which the foregoing  rights of the Purchaser  shall be included and to
          vote the Ordinary Shares of the Company owned by each of them in favor
          of the nomination of one  representative of the Purchaser to the Board
          of Directors of the Company, and as many other representatives of such
          Sellers  shall  indicate  (but in no event  less  then the  number  of
          representatives  as they have  immediately  prior to the IPO), as more
          fully set forth in the  Voting  Agreement  attached  hereto.(including
          certain instances whereby the board members may exclude a member).

10.  DEFAULTING  SELLING  SHAREHOLDER.  If,  on  the  Closing  Date, any Selling
     Shareholder  defaults in  the performance  of its  obligations  under  this
     Agreement,  any   of  the  remaining  non-defaulting  Selling  Shareholders
     shall have the  option to  sell  the  Selling  Shareholders'  Shares  which
     the  defaulting Selling  Shareholders  agreed but  failed to  sell on  such
     Closing Date in  the respective  proportions which  the  number of  Selling
     Shareholders'  Shares  set  forth  opposite   the  name  of   each  Selling
     Shareholder   in  Exhibit  2.1  hereto   who  elects  to   sell  additional
     Ordinary  Shares as a result of such default  bears  to  the  total  number
     of  Selling  Shareholders'  Shares  set  forth  opposite  the  names of all
     the   Selling   Shareholders  on  Exhibit  1  hereto   who  elect  to  sell
     additional Ordinary Shares as  a result of such  default.  If  none (or  an
     insufficient  number) of  the  non-defaulting  Selling  Shareholders  elect
     to  sell the  Shares  which  the  defaulting  Selling  Shareholders  agreed
     but failed  to  sell  on  the Closing  Date, this Agreement shall terminate
     without   liability   on   the   part   of   any   non-defaulting   Selling
     Shareholders,  the   Company  or   the  Purchaser.  Nothing   herein  shall
     derogate from the rights  of  the  Purchaser,  in law  or  equity,  against
     such a defaulting Selling Shareholder.

11.  NOTICES

     11.1. Any notice, declaration or other communication required or authorized
          to be given by any party under this Agreement to any other party shall
          be in writing and shall be  personally  delivered or sent by facsimile
          transmission (with a copy by registered mail in either case) addressed
          to the other party at the address  stated below or such other  address
          as shall be specified by the party  concerned by notice in  accordance
          with the  provisions  of this  Section.  Any notice shall be deemed to
          have been received on the next following business day.

     11.2. Addresses for the purposes of this Section are as follows:


                                        9

<PAGE>

         Company:          Yael Langer, Adv.
                           RADVision Ltd.
                           Raoul Wallenberg Street
                           Tel-Aviv 69719, Israel
                           Fax: (3) 6498248

         Sellers:          As appearing in the first column of Exhibit 1

         with a copy to:   Yael Langer, Adv.
                           RADVision Ltd. Legal Department
                           24 Raoul Wallenberg Street
                           Tel-Aviv 69719, Israel
                           Fax: (3) 6498248

         Siemens:          Hofmannstrasse 51
                           D-81359 Munich
                           Germany
                           Attention: Mr. Guenther Barth
                           Fax: (89) 7222 3365

         With a copy to:   Israel Kantor, Adv. and/or Royi Nachimzon, Adv.
                           Kantor, Elhanani, Tal & Co.
                           74-76 Rothschild Blvd.
                           Tel-Aviv 65785, Israel
                           Fax: (3) 5662960

         Payment Agent:    RAD Data Communications Ltd.
                           24 Raoul Wallenberg Street
                           Tel Aviv 69719
                           Attention: Eitan Abramovitch
                           Fax: (3) 648 7350

         ESCROW AGENT:     Israel Kantor, Adv.
                           Kantor, Elhanani, Tal & Co.
                           74-76 Rothschild Blvd.
                           Tel-Aviv 65785, Israel
                           Fax: (3) 5662960

12.  GENERAL

       12.1  This Agreement shall (except for  any  obligation  fully  performed
       prior to or at the Closing  Date)  continue  in  full  force  and  effect
       (except for provisions which, in accordance with their express terms, are
       limited in time or otherwise,  insofar as they are so limited)  after the
       Closing Date notwithstanding that the Closing shall have occurred.

                                       10
<PAGE>

       12.2 All of the parties to this Agreement  will after,  as well as before
       and upon,  the  Closing  Date do all acts and things and sign and execute
       all  documents  and deeds  required for the purpose of  implementing  the
       terms of this Agreement.

       12.3  None  of the  rights  or  obligations  under  or  pursuant  to this
       Agreement  may be assigned or  transferred  to any other person or entity
       without the written  consent of all the  parties  hereto  except that the
       Sellers and the Purchaser  may so transfer or assign to their  respective
       affiliates or between  themselves,  provided that: (i) the assignee shall
       be an affiliate of the relevant party at the time it exercises any of its
       rights or obligations hereunder; (ii) the assignor shall inform the other
       parties  hereto of such  assignment  at least 5 business days prior to it
       being effected;  (iii) the assignee shall agree in writing to be bound by
       all of the terms  hereof;  (iv) the assignor  shall remain liable for any
       and all of its obligations under this Agreement.

       12.4 This  Agreement  contains  the whole  agreement  between the parties
       relating  to  the  transactions   provided  for  in  this  Agreement  and
       supersedes  all  previous  agreements,  if any,  between  such parties in
       respect  of such  matters  and  each  of the  parties  to this  Agreement
       acknowledges  that in  agreeing to enter into this  Agreement  it has not
       relied on any representations or warranties except for those contained in
       this Agreement.

       12.5 No failure  or delay by any party  hereto in  exercising  any claim,
       remedy, right, power or privilege under this Agreement shall operate as a
       waiver  nor shall any single or partial  exercise  of any claim,  remedy,
       right,  power or  privilege  preclude  any  further  exercise  thereof or
       exercise of any other claim, right, power or privilege.

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

       12.7 Except as expressly  provided herein,  this Agreement may be amended
       or terminated,  and any of the terms hereof waived, only by a document in
       writing  specifically  referring  to this  Agreement  and executed by the
       parties  hereto  or,  in the  case  of a  waiver,  by the  party  waiving
       compliance.  The  failure  of any  party  hereto  at any time or times to
       require  performance of any  provisions  hereof shall in no manner affect
       this right at a later time.  No waiver by any party hereto of a breach of
       any term contained in this Agreement, in any one or more instance,  shall
       be deemed or  construed  as a further  or  continuing  waiver of any such
       breach or a waiver of any breach of any other form.

       12.8 All  Ordinary  Share  numbers in this  Agreement  give effect to the
       stock  split and  distribution  of bonus  shares  which  will take  place
       immediately prior to the closing of the IPO.

       12.9  The  timing  and  text of any  public  announcement  regarding  the
       existence of this  Agreement or the terms hereof shall be agreed  between
       the parties hereto,  such agreement not to be  unreasonably  withheld and
       shall also be approved by the Lead Underwriters of the IPO.

       12.10 This Agreement shall not be construed as granting any rights to any
       third  party.  In this  Agreement,  third  party shall mean any person or
       entity that is not a party to this Agreement.

13.    GOVERNING LAW AND SERVICE OF PROCESS


                                       11
<PAGE>

       13.1 This  Agreement is subject to and shall be interpreted in accordance
       with the laws of the State of Israel.

       13.2 For the purposes of any claim under this Agreement, the addresses of
       the Selling  Shareholders for the purposes of service of process shall be
       their  addresses  as set forth in the first  column of Exhibit 1, or such
       other  address as any Selling  Shareholder  shall notify the Purchaser in
       writing.

14.    ARBITRATION

       14.1 All disputes arising out of or in connection with this Agreement and
       other agreements resulting herefrom, including any question regarding its
       existence,  validity or  termination,  shall be finally settled under the
       Rules of  Arbitration  of the  International  Chamber of Commerce,  Paris
       France,  by three arbitrators in accordance with the said rules. The seat
       of arbitration  shall be Tel Aviv,  Israel.  The procedural law of Israel
       shall apply where the rules are  silent.  The  language to be used in the
       arbitration proceeding shall be English

       14.2  The  parties   undertake  to  abide  by  and  fully  implement  the
       arbitration award rendered,  and this Section 14 shall be deemed to be an
       arbitration agreement in accordance with the Arbitration Law-1968.

       14.3 Each of the  parties  or, if there  are more than one  plaintiff  or
       defendant, each of Yehuda Zisapel and Zohar Zisapel together on behalf of
       the  Sellers  and  the  Purchaser   shall  nominate  one  arbitrator  for
       confirmation  by the  competent  authority  under  the  applicable  rules
       ("APPOINTING  AUTHORITY") within thirty (30) days. Both arbitrators shall
       agree on the  third  arbitrator  within  30 days.  In the  event  that an
       arbitrator  is to be appointed  by more than one party,  and they fail to
       agree upon the  identity of such  arbitrator  within the  aforesaid  time
       period,  any  other  party  to the  arbitration  may  request  that  such
       arbitrator  be  appointed  by the  Appointing  Authority.  Should the two
       arbitrators fail, within the above time-limit,  to reach agreement on the
       third arbitrator, he shall be appointed by the Appointing Authority.

15.  TERMINATION  At any time prior to the Closing Date,  the Company shall have
the right,  in its sole  reasonable  discretion,  to terminate this Agreement AB
INITIO without any liability or adverse affect or without it being  considered a
breach of this Agreement,  if the Company can  substantiate by reasonable  proof
that the  applicable  governmental  authorities  may  prevent the IPO from going
forward or  substantially  delay the IPO process as a result of the transactions
contemplated by this Agreement.  If the closing of the IPO does not occur within
sixty days of the effective date of this  Agreement,  the Purchaser shall have a
right,  in its sole and  absolute  discretion,  to terminate  this  Agreement AB
INITIO  without any  penalty,  liability  or adverse  affect,  and without  such
termination being considered a breach of this Agreement.


                                       12
<PAGE>

                  IN WITNESS WHEREOF,  the parties have caused this Agreement to
be signed by its duly  authorized  representatives  as of the date  first  above
written.

SIEMENS Aktiengesellschaft


By:  _______________________________
Name:
Title:


RADVision Ltd.

By:  _______________________________
Name:
Title:



                THE REST OF THIS PAGE IS LEFT INTENTONALLY BLANK



                                       13
<PAGE>

<TABLE>
<CAPTION>
NAME AND ADDRESS OF SELLING SHAREHOLDER                                 SIGNATURE
<S>                                                      <C>

Yehuda Zisapel                                           By:  _____________________________
23 Kisufim Street                                        Name: ____________________________
Tel Aviv, Israel                                         Title: ___________________________


Zohar Zisapel                                            By:  _____________________________
54 Pinchas Street                                        Name: ____________________________
Tel Aviv, Israel                                         Title: ___________________________


Michael & Klil Properties (93) Ltd.                      By:  _____________________________
12 Hanechoshet Street                                    Name: ____________________________
Tel Aviv 69710 Israel                                    Title: ___________________________


Lomsha Ltd.                                              By:  _____________________________
12 Hanechoshet Street                                    Name: ____________________________
Tel Aviv 69710 Israel                                    Title: ___________________________


Amos Amir                                                By:  _____________________________
9 Eliahu Hacham Street                                   Name: ____________________________
Tel Aviv, Israel                                         Title: ___________________________


Plonit Achzakot Ltd.                                     By:  _____________________________
9 Eliahu Hacham Street                                   Name: ____________________________
Tel Aviv, Israel                                         Title: ___________________________

</TABLE>

                                       14
<PAGE>

<TABLE>
<CAPTION>
<S>                                                      <C>

Nichsei Almonit Ltd.                                     By:  _____________________________
12 Hanechoshet Street                                    Name: ____________________________
Tel Aviv 69710 Israel                                    Title: ___________________________


RAD Data Communications Ltd.                             By:  _____________________________
12 Hanechoshet Street                                    Name: ____________________________
Tel Aviv 69710 Israel                                    Title: ___________________________


Efraim Wachtel                                           By:  _____________________________
20 Hagefen Street                                        Name: ____________________________
Raanana, Israel                                          Title: ___________________________


Daniella Ilan                                            By:  _____________________________
12 Eliahu Hakim Street                                   Name: ____________________________
Tel Aviv, Israel                                         Title: ___________________________


Yoram Holtz                                              By:  _____________________________
18 Hakotzer Street                                       Name: ____________________________
Ramat Hasharon, Israel                                   Title: ___________________________


Dario Zipris                                             By:  _____________________________
9/5 Ussiskin Street                                      Name: ____________________________
Ramat Hasharon, Israel                                   Title: ___________________________


Ilan Seidner                                             By:  _____________________________
3A Kushani Street                                        Name: ____________________________
Ramat Aviv                                               Title: ___________________________


Arie Oren                                                By:  _____________________________
8 Tana Street                                            Name: ____________________________
Rosh Haayin, Israel                                      Title: ___________________________


Aaron Strossberg                                         By:  _____________________________
16 Brodetsky Street                                      Name: ____________________________
Rishon Lezion, Israel                                    Title: ___________________________


Eitan Abramovitch                                        By:  _____________________________
27 Hahatzav Street                                       Name: ____________________________
Mevasseret Zion, Israel                                  Title: ___________________________


Eli Luz                                                  By:  _____________________________

</TABLE>

                                       15
<PAGE>

<TABLE>
<CAPTION>
<S>                                                      <C>

c/o Trust Company of Maritime Bank of Israel Ltd.        Name: ____________________________
35 Ahad Ha'am Street                                     Title: ___________________________
Tel Aviv, Israel


Lerosh Investments Ltd.                                  By:  _____________________________
c/o Trust Company of Maritime Bank of Israel Ltd.        Name: ____________________________
35 Ahad Ha'am Street                                     Title: ___________________________
Tel Aviv, Israel


Trust Company of Maritime Bank of Israel Ltd.            By:  _____________________________
35 Ahad Ha'am Street                                     Name: ____________________________
Tel Aviv, Israel                                         Title: ___________________________


ECI Telecom Ltd.                                         By:  _____________________________
30 Hasivim Street                                        Name: ____________________________
Petach Tikva, Israel                                     Title: ___________________________


Factory Systemes SA                                      By:  _____________________________
22,  Rue  Vladimir  Jankelevitch  Emerainville,   77437  Name: ____________________________
Marne La Vallee Cedex 2, France                          Title: ___________________________


Clal Venture Capital LP                                  By:  _____________________________
Atidim Technology Park, Bldg. 4                          Name: ____________________________
Tel Aviv, Israel                                         Title: ___________________________


Robert Freeman                                           By:  _____________________________
407 Robbins Road                                         Name: ____________________________
Neptune, New Jersey                                      Title: ___________________________


Shrem Pudim Kelner Trust Company Ltd.                    By:  _____________________________
21 Haarbaah Street                                       Name: ____________________________
Tel Aviv, Israel                                         Title: ___________________________


Evergreen Canada Israel Management Ltd.                  By:  _____________________________
c/o Evergreen Israel                                     Name: ____________________________
96 Rothschild Blvd.                                      Title: ___________________________
Tel Aviv, Israel


IJT Technologies Ltd.                                    By:  _____________________________
c/o Evergreen Israel                                     Name: ____________________________
96 Rothschild Blvd.                                      Title: ___________________________
Tel Aviv, Israel

</TABLE>
                                       16

<PAGE>

<TABLE>
<CAPTION>
<S>                                                      <C>

Periscope I Fund LP, an Israeli partnership              By:  _____________________________
c/o Evergreen Israel                                     Name: ____________________________
96 Rothschild Blvd.                                      Title: ___________________________
Tel Aviv, Israel


Periscope I Fund LP, a Delaware partnership              By:  _____________________________
c/o Evergreen Israel                                     Name: ____________________________
96 Rothschild Blvd.                                      Title: ___________________________
Tel Aviv, Israel

</TABLE>

                                       17

                                VOTING AGREEMENT

         THIS VOTING AGREEMENT (the "Agreement") made and entered into as of the
___ day of March,  2000 by and  between  (1) the  persons  listed in  Schedule I
hereto (the "Existing  Shareholders");  and (2) Siemens  Aktiengesellschaft (the
"New  Shareholder",  and together with the Existing  Shareholders,  collectively
referred to herein as the "Parties").

         WHEREAS, the Existing Shareholders,  RADVision Ltd. (the "Company") and
the New Shareholder have entered into a Share Purchase  Agreement dated February
22, 2000 (the "Share  Purchase  Agreement"),  under which the New Shareholder is
acquiring  ordinary  shares of the  Company,  par  value NIS 0.1 per share  (the
"Ordinary Shares") from the Existing Shareholders and the Company; and

         WHEREAS,  pursuant to the terms of the Share  Purchase  Agreement,  the
Parties have agreed to enter into an agreement with respect to the voting of the
Ordinary Shares held by each of the Parties.

         NOW, THEREFORE, the Parties agree as follows:

1. INTERPRETATION

   1.1. The recitals to this Agreement constitute an integral part hereof.

   1.2. In this Agreement, all  capitalized terms  which are not  defined herein
        shall  have the meaning  ascribed to  such terms  in the  Share Purchase
        Agreement.

2. TERM

        Subject to  Section 4 hereof,  the initial term of this Agreement  shall
be for three years from the Closing Date, and thereafter  shall be automatically
extended for two successive  additional one year periods,  unless  terminated by
any of the Parties upon written notice to the other Parties given at least sixty
(60) days prior to the expiration date of the then current term.

3. AGREEMENT TO VOTE FOR DIRECTORS

3.1  Each of the  Parties  hereby  agrees  to vote,  either  in person or by its
     nominee or proxy,  all  Ordinary  Shares  beneficially  owned,  directly or
     indirectly,  by such Party on the date hereof or hereafter  acquired,  at a
     regular or special  meeting of the  Company's  shareholders  (or by written
     consent) at which the directors  ("Directors")  of the  Company's  board of
     directors (the "Board") are to be elected, in favor of a slate of Directors
     consisting  of: (i) one nominee of the New  Shareholder  to the Board,  and
     (ii) as many other  representatives  that such Selling  Shareholders  shall
     unanimously



<PAGE>

     indicate  (but  in  no  event  less   than  the   number  and  identity  of
     representatives as they have immediately prior to the IPO).

     The Parties further agree  to cause the existing Board,  and future Boards,
     to nominate for  election  such persons in any proxy  statement and written
     ballot  sent to the  shareholders  of the Company in  connection  with such
     election or meeting.

3.2  At least  three days in advance of each  regular or special  meeting of the
     Company's  shareholders  at which  the  Directors  of the  Board  are to be
     elected,  the Parties  entitled to select nominees to the Board will notify
     the other  Parties of the identity of the  nominee(s)  to be elected to the
     Board in accordance with Section 3.1 above.

3.3  Upon the Closing,  the nominee of the New Shareholder shall be appointed as
     a Director  to the Board in  accordance  with  Article 88 of the  Company's
     Articles  of  Association,  or by the  convention  of a regular  or special
     meeting.

4. TERMINATION OF DIRECTORSHIP

In the event that all Directors,  except for one Director,  decide in good faith
and believing it to be in the best interests of the Company and can substantiate
their decision by reasonable proof that the continuing  presence of any Director
appointed by a Party pursuant to Section 3 hereof as a Director of the Board may
damage the business  prospects of the Company,  then (i) the right of such Party
to appoint a Director under this Agreement shall immediately  terminate and such
Board Member shall  immediately  resign from the Board,  (ii) the other  Parties
shall be released from any obligation to vote their Ordinary  Shares in favor of
such Party's  nominee,  and such Party shall be released from its obligations to
vote as well and (iii) the Parties shall take all actions necessary,  including,
without limitation,  convening a meeting of shareholders,  to effect the removal
of such Director from the Board.

5. TRANSFER AND PLEDGE OF ORDINARY SHARES

        5.1  Ordinary  Shares of  a Party to this  Agreement  transferred  to an
Affiliate or to another Party to this  Agreement  shall  continue to be bound by
this Agreement.

        For purposes  of this Agreement,  an "Affiliate" shall mean a 'relative'
(as such term is defined in the Companies Law-1999) and/or any entity in which a
Party hereto, or a 'relative' of a Party hereto, holds an equity interest.

        5.2  Any  pledge,  mortgage,  hypothecation,  encumbrance  and the  like
(collectively  referred as the  "Pledge")  of the  Ordinary  Shares owned by the
Parties  hereto shall be subject to: (i) the inclusion of the provisions of this
Agreement  in the  Pledge  documents;  and (ii) the  written  commitment  of the
Pledgee to be bound by, and  comply  with,  the  provisions  of this  Agreement,
including  the  commitment  of the  Pledgee  to bind any  transferees  to such a
commitment should it exercise the Pledge.


                                         2
<PAGE>

6. REMEDIES

        The  Parties  acknowledge  that  time  is  of  the  essence  under  this
Agreement for the performance of the acts  contemplated  hereunder and that this
Agreement,   and  each  provision  contained  herein,  is  subject  to  specific
performance by any court of competent jurisdiction.

7. NOTICES

        All  notices or other  communications  required or  permitted  hereunder
shall be in writing  (except as otherwise  provided  herein) and shall be deemed
duly given when received by delivery in person, by facsimile,  telex or telegram
or by an overnight  courier  service  addressed to the address of the respective
Party set forth opposite the name of such Party on Schedule I hereto.

8. SUCCESSORS

        The terms  and conditions of this  Agreement  shall inure to the benefit
and be binding upon the  respective  successors of the Parties.  Nothing in this
Agreement,  express or implied,  is intended to confer upon any party other than
the Parties or their respective  successors and assigns,  any rights,  remedies,
obligations,  or  liabilities  under or by reason of this  Agreement,  except as
expressly provided in this Agreement.

9. GOVERNING LAW AND ARBITRATION

        9.1 This Agreement is subject to and  shall be interpreted in accordance
with, the laws of the State of Israel.

        9.2 Without  derogating from that stated in section 6 above, the Parties
hereto  agree that the  Arbitration  provision of the Share  Purchase  Agreement
shall be binding upon them with respect to this Agreement and any and all issues
and disputes arising hereunder.


                                         3
<PAGE>


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


<TABLE>
<CAPTION>
     <S>                                                    <C>

     Siemens Aktiengesellschaft                             Amos Amir

     By:_______________________                             __________________________
     Name:
     Title:

     Yehuda Zisapel                                         Zohar Zisapel

     _________________________                              __________________________

     Plonit Achzakot Ltd.                                   Nichsei Almonit Ltd.

     By:_______________________                             By:_______________________
     Name:                                                  Name:
     Title:                                                 Title:

     Michael and Klil Holdings (93) Ltd.                    Evergreen Canada Israel Management Ltd.

     By:_______________________                             By:_______________________
     Name:                                                  Name:
     Title:                                                 Title:

     Lomsha Ltd.                                            Periscope I Fund, Israeli Partnership

     By:_______________________                             By:_______________________
     Name:                                                  Name:
     Title:                                                 Title:

     RAD Data Communications Ltd.                           Periscope I Fund, LP

     By:_______________________                             By:_______________________
     Name:                                                  Name:
     Title:                                                 Title:

     Clal Venture Capital Fund LP                           IJT Technologies Ltd.

     By:_______________________                             By:_______________________
     Name:                                                  Name:
     Title:                                                 Title:

</TABLE>

                                         4
<PAGE>

                                   SCHEDULE I
<TABLE>
<CAPTION>
                      PARTY                                                ADDRESS
     <S>                                                     <C>

     Yehuda Zisapel                                          Atidim Technllogical Park, Building No. 4,
                                                             Tel-Aviv


     Zohar Zisapel                                           12, Hanechoshet Street, Tel-Aviv



     Michael and Klil Holdings (93) Ltd.                     12, Hanechoshet Street, Tel-Aviv



     Lomsha Ltd.                                             12, Hanechoshet Street, Tel-Aviv



     RAD Data Communications Ltd.                            12, Hanechoshet Street, Tel-Aviv



     Amos Amir                                               Eliahu Hakim 9/3,  Tel-Aviv



     Plonit Achzakot Ltd.                                    Eliahu Hakim 9/3,  Tel-Aviv



     Nichsei Almonit Ltd.                                    Eliahu Hakim 9/3,  Tel-Aviv



     Clal Venture Capital Fund LP                            Atidim Technllogical Park, Building No. 4,
                                                             Tel-Aviv


     Evergreen Canada Israel Management Ltd.                 96 Rothschild Blvd.
                                                             Tel-Aviv  65224


     Periscope I Fund, Israeli Partnership                   96 Rothschild Blvd.
                                                             Tel-Aviv  65224


     Periscope I Fund, LP                                    96 Rothschild Blvd.
                                                             Tel-Aviv  65224


     IJT Technologies Ltd.                                   96 Rothschild Blvd.
                                                             Tel-Aviv  65224
</TABLE>



                                        5

                         ASSIGNMENT OF REGISTRATION RIGHTS


Each of the  undersigned  (collectively  the  "Transferors")  hereby  assigns to
SIEMENS AKTIENGESELLSCHAFT (the "Transferee") any and all of its rights to cause
RADVision  Ltd. (the  "COMPANY") to register the Shares (as such term is defined
hereunder) for trading on any securities  exchange at which the Company's shares
are trading (the "Registration Rights") as described in Annex A that is attached
hereto,   and  the  Transferee   hereby  accepts  the  said  assignment  of  the
Registration Rights and agrees to be bound by all of the terms and conditions to
which such  Transferor  was bound at the time of the execution of this deed with
respect to the Registration Rights of the Shares.

For purposes of this deed, the following term shall bear the meaning ascribed to
it, as follows:

"SHARES" -             The  Company's  ordinary  shares  par  value  NIS 0.1 per
                       share,  sold by each of the Transferors to the Transferee
                       pursuant to a Share  Purchase  Agreement  dated  February
                       22nd,  2000, a copy of which is attached  hereto as ANNEX
                       B.



This deed shall be effective as of March 17th, 2000.



       [SIGNATURES ATTACHED HERETO]                   __________________________
       Transferors                                    Transferee
                                                      By: ______________________
                                                      Title: ___________________



                             CONFIRMATION OF COMPANY

RADVision   Ltd.   hereby   confirms   that  it  has  received   notice  of  the
above-described assignment and that said assignment is binding upon it.


_____________________________
RADVision Ltd.
By: _________________________
Title: ______________________


<PAGE>


SIGNATURES OF TRANSFERORS:

[TO BE COMPLETED]


<PAGE>


                                     ANNEX A


                             THE REGISTRATION RIGHTS


1.     The registration  rights of 971,432 ordinary shares par value NIS 0.1 per
       share shall be pursuant to the terms and conditions of the share purchase
       agreements,  dated April 18th,  19th,  26th and 27th 1995, by and between
       the  Company  and,  INTER  ALIA,  the  Transferors  or  any of  them  (as
       applicable).

2.     The  registration  rights of 35,970 ordinary shares par value NIS 0.1 per
       share shall be pursuant to the terms and  conditions of a share  purchase
       agreement,  dated September  12th,  1996, by and between the Company and,
       INTER ALIA, the Transferors or any of them (as applicable).

3.     The registration  rights of 223,535 ordinary shares par value NIS 0.1 per
       share shall be pursuant to the terms and  conditions of a share  purchase
       agreement,  dated May 12th,  1998, by and between the Company and,  INTER
       ALIA, the Transferors or any of them (as applicable).





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