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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ----------------------



                                   F O R M 6-K

                      Pursuant to Section 13a-16 or 15d-16
                     of the Securities Exchange Act of 1934


                           For the month of April 2001



                                 RADVISION LTD.
                              (Name of Registrant)




                 24 Raoul Wallenberg St., Tel Aviv 69719 Israel
                     (Address of Principal Executive Office)


     Indicate  by check mark  whether the  registrant  files or will file annual
reports under cover of Form 20-F or Form 40-F.

                        Form 20-F X        Form 40-F __


     Indicate by check mark whether the registrant by furnishing the information
contained  in this  Form is  also  thereby  furnishing  the  information  to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

                        Yes __             No  X


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                                 RADVISION LTD.





6-K Items

     1.   RADVision Ltd. Press Release dated April 5, 2001 re RADVision  Reports
          Preliminary First Quarter Results.






                                                                          ITEM 1



  Corporate Contacts:                           Investor Contacts:
  David Seligman                                Jody Burfening/Sanjay Hurry
  Chief Financial Officer                       Lippert/Heilshorn & Associates
  RADVISION, Ltd.                               Tel: 212.838.3777
  Tel: 972.3.645.5446                           jbs@lhai.com
  cfo@radvision.com

  Sandra Fathi
  Dir. Corporate Communications
  RADVISION, Inc.
  Tel: 201.529.4300 x301
  Mobile: 201.406.6150
  sfathi@radvision.com


               RADVISION REPORTS PRELIMINARY FIRST QUARTER RESULTS

        - Company Revises Guidance for the Second Quarter and Comments on
                            Outlook for Fiscal 2001 -

     Tel Aviv,  Israel,  April 5, 2001 -- RADVISION  Ltd.  (NASDAQ:  RVSN),  the
leading provider of award-winning, industry-standard products and technology for
real-time  voice and video  communication  over IP  (V2oIP(TM)),  today reported
preliminary  results  for the  first  quarter  of 2001.  Revenues  for the first
quarter are expected to be in the range of $14.8 to $14.9 million, compared with
revenues of $7.8 million in the first quarter of 2000. Net income is expected to
be between $1.8 and $1.9 million, or $0.08 to $0.09 per share, compared to a net
loss of $0.5 million,  or $0.04 per share,  in the first quarter of 2000.  These
anticipated  first quarter  results for 2001 compare to prior  guidance of $15.3
million in revenues and net income of $1.9 million, or $0.09 per share.

     Commenting  on the  expected  results  for the  quarter,  Ami  Amir,  chief
executive  officer of RADVISION,  said, "We are seeing a slow down in enterprise
spending  in the  United  States,  leading  to  lower  orders  from  some of our
customers for our networking  products  compared to what we expected at the time
of our fourth quarter conference call. At the same time, we expect revenues from
enabling technologies to be on plan for the quarter."

     Citing a less  predictable  business  environment  and ongoing  softness in
enterprise spending in the United States, Mr. Amir said that the Company expects
to report revenues







for the second  quarter in the range of $11.5 to $12.5  million and  earnings in
the range of $0.01 and $0.02 per share. According to Mr. Amir, "The current lack
of visibility  makes it extremely  difficult for us to put forward  guidance for
the second  half of the year with a high  degree of  confidence.  Minimally,  we
expect  revenues  for fiscal 2001 to be no less than the $46 million we reported
in fiscal 2000."

     "We are aligning our cost  structure  with our lower  revenue  expectations
with  a view  toward  maintaining  positive  earnings  in  fiscal  2001.  We are
concentrating  our resources on sales driven  activities and on establishing new
channel  partners  outside of the United States and  strengthening  our existing
channel  partnerships.  We have reduced overall  spending and have implemented a
10% reduction in our workforce  effective April 2nd. We are focusing our efforts
on improving our performance by doing more with less and without sacrificing our
long-term goals."

     Concluded Mr. Amir,  "With cash and cash  equivalents  of $97 million as of
December 31, 2000 and  virtually no debt,  we believe that we have the financial
stability to weather this  slowdown and maintain our market  leadership  and the
technological  advantage that we have relative to our  competitors.  We have the
resources to leverage our current  reputation as the recognized experts in V2oIP
and build for the future through continued  investment in new product and market
development."


First  Quarter  2001  Earnings  Conference  Call and Webcast - April 18, 2001 at
9:00a.m. EST

RADVISION  management  will host a  conference  call and  webcast to discuss the
company's first quarter results and discuss its detailed guidance for the second
quarter and  estimated  results for the  remainder of fiscal 2001 on  Wednesday,
April 18th at 9:00 a.m. EST.  Those wishing to join should call (888)  730-9143,
international  callers dial (712)  257-3640,  at  approximately  8:50 a.m.  EST.
Members of the  investment  community  are also  invited to visit the  "Investor
Relations" area of the company's  website,  www.radvision.com,  to listen to the
conference  call  via live  Webcast.  A replay  of the  call  will be  available
starting on April 18th at 11:00 a.m. EST and continuing  until April 25 at






11:00 p.m. EST. To access the replay, please call (888) 277-9374,  international
callers dial (402) 998-0936.

ABOUT RADVISION

RADVISION is a leading  provider of products and technology for real-time voice,
video, and data communications over packet networks;  this includes the Internet
and other Internet Protocol (IP) based networks.  Recognized  universally as the
experts in real-time  Voice and Video over IP  (V(2)oIP),  RADVISION  offers the
broadest and most complete set of enabling  technology  and  networking  systems
needed to enable  enterprises  and service  providers to migrate their voice and
video  communications  from  traditional  telephone  networks  to new  converged
networks. Today, hundreds of thousands of end-users around the world communicate
over  next-generation  networks,  using IP-centric  products and solutions built
around RADVISION products and technology.  RADVISION 's multi-protocol  software
toolkits  for  IP  communications   include:   SIP,  MEGACO,  MGCP,  and  H.323;
RADVISION's V(2)oIP networking products include: gateways, conferencing bridges,
and gatekeeper applications. For more information,  please visit our website at:
www.radvision.com.

This press release contains forward-looking statements that are subject to risks
and uncertainties.  Factors that could cause actual results to differ materially
from these  forward-looking  statements include, but are not limited to, general
business conditions in the industry,  changes in demand for products, the timing
and amount or  cancellation of orders and other risks detailed from time to time
in RADVision's  filings with the Securities and Exchange  Commission,  including
RADVision's Form F-1 registration statement.

All trademarks recognized


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                                   SIGNATURES




     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, thereunto duly authorized.



                                                  RADVISION LTD.
                                                 ----------------
                                                   (Registrant)



                                                   By   /s/David Seligman
                                                        -----------------

                                                       David Seligman
                                                       Chief Financial Officer


Dated: April 5, 2001