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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 May 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 May 21, 2001 re Samsung  Electronics
     Integrates  RADVISION's  H.323 Enabling  Technology  into New Voice Over IP
     Products.

2.   RADVision  Ltd.  Press  Release  dated  May  23,  2001 re  RADVISION  Hosts
     Worldwide  Technology  Seminars:  Tools and Solutions  for  Next-Generation
     Networks.




                                                                          ITEM 1



Contact:

David Seligman               Sandra Fathi
CFO                          Dir. Corporate Communications
RADVISION                    RADVISION
Tel: +972.3.645.5446         Tel: 201.529.4300 x 301
cfo@radvision.com            sfathi@radvision.com


Jody Burfening/Sanjay Hurry
Investor Relations
Lippert/Heilshorn & Associates
Tel: 212.838.3777
jbs@lhai.com


    Samsung Electronics Integrates RADVISION's H.323 Enabling Technology into
                           New Voice Over IP Products
          RADVISION'S LEADING H.323 TECHNOLOGY ENHANCES BROAD RANGE OF
               SAMSUNG ELECTRONICS' CORPORATE LEVEL APPLICATIONS

Tel Aviv, Israel, May 21, 2001 --RADVISION  (NASDAQ:RVSN),  the leading provider
of award-winning,  industry-standard products and technology for real-time voice
and video over IP  (V2oIPTM),  today  announced  that Samsung  Electronics,  the
leading manufacturer of applications solutions,  will be integrating RADVISION's
H.323 Protocol Toolkit into its major corporate level H.323-based products.

This is an extension of Samsung  Electronics'  existing  umbrella  agreement for
their VoIP corporate  products with  RADVISION.  The  integration of RADVISION's
V2oIP software will allow Samsung  Electronics to provide carriers,  enterprises
and developers with  breakthrough  technology and  high-quality,  cost-effective
products and applications quickly and effectively.

"Samsung is  dedicated to  developing  the worlds best  products  and  services,
reinforcing our leading position in digital  applications,"  said Vice President
Wonsang  Cho of Samsung  Electronics.  "We choose  RADVISION  as our  technology
partner  because  they  uphold a  superior  product  standard  and have the same
dedication to service excellence."

"As the leading  industry  providers  of V2oIPTM  technology,  RADVISION is very
enthusiastic  about  expanding  our  relationship  with Samsung  Electronics  to
deliver a new range of world-class,  next generation products. Our collaboration
reinforces both companies  commitment to delivering high  performance and highly
interoperable IP-based solutions," says Gadi Tamari, CEO of RADVISION.

About H.323 Toolkit

RADVISION's  H.323 Protocol  Toolkit enables the creation of real-time voice and
video H.323 calls over IP networks. The H.323 Protocol Toolkit consists of H.225
RAS,  RTP/RTCP and Q.931 Call Signaling.  RADVISION also offers optional modules
for Annex G for Gatekeeper-to-Gatekeeper  Communication, H.235 Security features
as well as H.450 Supplemental  Services for a more robust solution.  Designed to
be platform  independent,  the RADVISION H.323 protocol toolkit is available for
numerous  operating systems  including various UNIX versions,  real-time OSs for
embedded systems, as well as Windows, including Windows NT and Win CE.

                                    --more--






About Samsung Electronics

Samsung  Electronics Co., Ltd., with 1999 sales revenue of US$22.8 billion, is a
world leader in the electronics industry. The Korea based company has operations
in over 50 countries with 54,000  employees  worldwide.  The company consists of
three main business  units:  Digital  Media,  Semiconductors  and  Information &
Communications  Businesses.  For more  information,  please  visit our  website,
http://samsungelectronics.com.

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  (V2oIP),  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 V2oIP 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.


                                       ###

V2oIP,  and OnLAN are  trademarks  and viaIP is a service mark of RADVISION Ltd.
All  other  trade  names  and  trademarks  appearing  herein  are owned by their
respective holders.






                                                                          ITEM 2



Contact:

David Seligman                Sandra Fathi
Chief Financial Officer       Dir. Corporate Communications
RADVISION                     RADVISION
Tel: +972.3.645.5446          Tel: 201.529.4300 x 301
cfo@radvision.com             sfathi@radvision.com


Jody Burfening/Sanjay Hurry
Investor Relations
Lippert/Heilshorn & Associates
Tel: 212.838.3777
jbs@lhai.com


     RADVISION Hosts Worldwide Technology Seminars: Tools and Solutions for
                            Next-Generation Networks
 RADVISION'S FREE TECHNOLOGY SEMINARS WILL BE HELD IN THE UNITED STATES, EUROPE
                  AND ASIA BEGINNING IN JUNE THROUGH SEPTEMBER

MAHWAH, N.J., May 23, 2001 -- RADVISION (NASDAQ:  RVSN), the leading provider of
award-winning, industry-standard products and technology for real-time voice and
video over IP (V2oIPTM), today announced its worldwide technology seminar series
Tools and Solutions for Next-Generation Networks. The free seminars are designed
for  executives  and  engineers   involved  in  the  development  of  IP-centric
communication products or applications.

The RADVISION seminar series aims to clarify the V2oIP landscape, help companies
make the right decision about developing unique IP products or services, present
the  tools  and  solutions  available  for that  task and to help  identify  the
benefits and challenges behind product development strategies.

"As a provider of the key  underlying  IP  protocols  and  developer  of our own
network infrastructure products,  RADVISION is uniquely positioned at the center
of the IP  communications  revolution,"  said Dr.  Michelle  Blank,  senior vice
president of galactic  marketing for RADVISION.  "These seminars are designed to
share our  expertise  with  developers  of  innovative  voice and video  over IP
products and applications for next-generation networks."

RADVISION's  Tools and Solutions for  Next-Generation  Networks seminars will be
held in the following cities:

*    London, England Hilton Heathrow Hotel, June 4, 2001
*    Paris,  France  Sofitel  La Defense  Hotel,  June 5, 2001
*    Munich, Germany  Airport  Municon  Conference  Center,  June 6, 2001
*    Boston,  United States Boston Parker Plaza Hotel, June 26, 2001
*    San Francisco, United States Park Hyatt Hotel, June 28, 2001

Additional seminars in Asia will be held in the following cities in the summer
and fall:

*    Taipei, Taiwan
*    Beijing, China
*    Seoul, Korea
*    Tokyo, Japan

More information on the RADVISION seminar series and registration forms can be
found at www.radvision.com. Participation is free, however space is limited.

                                    --more--






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  (V2oIP),  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 V2oIP 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.


                                       ###

V2oIP,  and OnLAN are  trademarks  and viaIP is a service mark of RADVISION Ltd.
All  other  trade  names  and  trademarks  appearing  herein  are owned by their
respective holders.










                                   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: May 25, 2001