RADVISION LTD
6-K, 2000-06-05
COMPUTER COMMUNICATIONS EQUIPMENT
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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 June 2000



                                 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


================================================================================






<PAGE>




                                 RADVISION LTD.





6-K Items

1.   RADVision  Ltd.  Press  Release  dated June 1, 2000 re Enea OSE Systems and
     RADVision  First-to-Market with Industry Standard H.323 ported into OSE(TM)
     Realtime Operating System.

2.   RADVision  Ltd.  Press  Release  dated June 1, 2000 re RADVision  Showcases
     Carrier-Class  Solutions  for  Next-Generation  Communication  Networks  At
     SuperComm 2000 in Atlanta.

3.   RADVision  Ltd.  Press Release  dated June 2, 2000 re RADVision  Teams with
     congruency,  Inc. to Deliver Premium IP Telephony Services for the Emerging
     CASP Market.

4.   RADVision  Ltd. Press Release dated June 5, 2000 re RADVision and Vsys Join
     Forces   to   Deliver   Carrier-Grade   Solution   for  VoIP   Conferencing
     Applications.

5.   RADVision  Ltd.  Press Release  dated June 5, 2000 re RADVision  Introduces
     Unique Multipoint  Processing  Platform for Distributed  V2oIP(TM) Bridging
     Applications.






<PAGE>


                                                                          ITEM 1

<PAGE>



For Immediate Release


Contacts:

Danielle Schwartz          Nicolas Boillot           Karen Gurwitz
Enea OSE Systems, Inc.     Hart-Boillot, L.L.C.      Dir. Corp. Comm.
Tel:  214-346-9339, x 25   Tel: 781-893-0053, x 11   RADVision, Inc.
Fax:  214-346-9344         Fax: 781-893-0049         Tel: 201.529.4300, x305
[email protected]          [email protected]   [email protected]

David Seligman
CFO
RADVision, Ltd.
Tel: 972.3.645.5446
[email protected]



               Enea OSE Systems and RADVision First-to-Market with
      Industry Standard H.323 ported into OSE(TM) Realtime Operating System

Dallas,  TX/Mahwah,  NJ, June 1st,  2000 - Enea OSE Systems and  RADVision  Inc.
(NASDAQ:RVSN), the leading provider of award-winning, industry-standard products
and  technology  for  real-time  voice and video  communication  over IP,  today
announced  that  RADVision's  H.323  enabling  software  has been  ported to the
OSE(TM) realtime operating system (RTOS).  RADVision's H.323 technology combined
with the OSE RTOS provides a high-performance solution that addresses the design
requirements for a broad class of products  including IP telephones,  PSTN to IP
Network  gateways,   MCUs  for  bridging  calls  and  a  variety  of  gatekeeper
technologies.

RADVision's  core  enabling  software,  optimized  for  demanding  carrier-grade
applications and embedded systems, was ported into OSE's TCP/IP stack, developed
specifically  for  embedded  applications.  The  TCP/IP  stack,  part of the OSE
Internet  Protocols,  was built with a priority  placed on high  performance and
reduced code size. The OSE TCP/IP stack has proven a 10x  performance  advantage
over conventional STREAMS-based stacks.

"Given  that  both  Enea's  OSE  RTOS  and  RADVision's   H.323  technology  are
best-of-class products, it is only natural that we combine our forces to greatly
enhance the product offerings for our customers in the communications  markets,"
said George Kloak, vice-president of sales, RADVision, Inc.

"OSE  was  built   specifically   to  satisfy   challenges   in   communications
applications," said Bill McCombie,  manager of third-party  relations,  Enea OSE
Systems.   "The  OSE  TCP/IP  stack  was  also   conceived  for   communications
requirements. Along with RADVision's H.323 Software, developers can reduce their
time to market by focusing on building their IP Voice or IP Video applications -
not on developing protocol stacks and operating systems."


                                     (more)

<PAGE>


RADVision's  H.323 enabling software includes a package of modules that performs
all the functions needed to establish real-time  voice/video/data  communication
over IP networks,  and is part of the RADVision V2oIP toolkit family of enabling
technology for real-time voice and video  communication over IP technology.  The
toolkit uses a  building-block  approach,  allowing  OEMs/developers  to rapidly
bring to market  interoperable  standards  compliant  products  and services for
next-generation converged networks.

The  OSE  RTOS  offers  support  for  high-availability   systems,  as  well  as
comprehensive   memory  management   capabilities   tailored  to  the  needs  of
next-generation wired and wireless communications applications. The OSE Internet
Protocols  (INET)  support  complex  systems and include  One-Copy  standard BSD
sockets, as well as support for network applications including Telnet, FTP, DHCP
and DNS. Other protocols in the OSE portfolio are OSPF, RIP and SNMPv3.

About Enea OSE Systems

Enea OSE Systems is the technological  leader for realtime operating systems and
development  tools  for  building   distributed  and   fault-tolerant   realtime
applications. A subsidiary of Enea Data (SAXESS: ENEA), Enea OSE Systems employs
over 140  persons.  The company  focuses  primarily on  development  in telecom,
datacom, wireless and safety-critical  industries. For more information,  please
visit http://www.enea.com.

About RADVision

RADVision is a leading provider of products and technology that enable real-time
voice,  video  and data  communications  over  packet  networks,  including  the
Internet and other  networks based on the Internet  protocol or IP.  RADVision's
products and  technology are used by  RADVision's  customers to develop  systems
that enable  enterprises  and service  providers to use next  generation  packet
networks for real-time IP communications.  RADVision is actively involved in the
development of the industry  standards that are driving the emergence and growth
of the  use of  packet  networks  for  real-time  communications,  and  was  the
first-to-market  with  enabling  technology  and the  products  required for the
transmission  of  real-time  voice,  video and data over packet  networks.  As a
result,  RADVision  is well  positioned  to lead the market  with  products  and
technology that enable  enterprises and service providers to migrate their voice
and video communications from traditional  telephone networks to next generation
packet networks.  The company's products and technology include  standards-based
gateways,  conferencing  bridges,  gatekeepers and software  toolkits.  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.

                                      -30-

OSE is a trademark of Enea OSE Systems.
All other  company  names and  trademarks  are the  exclusive  property of their
rightful owners.



<PAGE>

                                                                          ITEM 2

<PAGE>

For Immediate Release

Contacts:

Karen Gurwitz               David Seligman                Paul Murray
Dir. Corp. Communications   CFO                           Public Relations
RADVision, Inc.             RADVision, Ltd.               Porter Novelli
Tel: 201.529.4300, x305     Tel:+ 972.3.645.5446          Tel: +33 4 76 84 49 69
[email protected]      [email protected]    [email protected]
www.radvision.com           www.radvision.com

Amy O'Bryan                         Robby Berman
Corporate Communications            Director, Marketing
Vsys                                congruency, Inc.
Tel:  719.785.5400                  Tel: 201.712.5590 x 117
[email protected]                        [email protected]
www.vsys.com                        www.congruency.com


                 RADVision Showcases Carrier-Class Solutions for
       Next-Generation Communication Networks At SuperComm 2000 in Atlanta

    BRAIN TEASING IP CHALLENGE FEATURES PRODUCTS AND SERVICES FROM RADVISION
        AND RADVISION PARTNERS - HP, VSYS AND CONGRUENCY AT BOOTH #1821

Mahwah, New Jersey,  June 1, 2000 -- RADVision Inc.  (NASDAQ:RVSN),  the leading
provider  of  award-winning,   industry-standard  products  and  technology  for
real-time voice and video  communication  over IP, together with its partners --
HP, Vsys and  congruency,  invites show  attendees to  participate  in the brain
teasing IP  Challenge  and learn about a range of carrier  class  solutions  for
next-generation IP communication networks at booth #1821 at SuperComm,  June 6 -
9 in Atlanta,  GA.  Challenge takers will have the opportunity to win big prizes
by  participating  in the IP Challenge,  a live  interactive  game show designed
around a variety of HOT market and technology  trends driving the convergence of
voice,  video  and data  over IP.  No one  leaves  the  Challenge  empty-handed.

Attendees  will be able to see  demonstrations  of RADVision's  newest  products
including the  innovative MP  (Multipoint  Processor)  platform for  distributed
voice  and  video  over IP  conferencing  solutions,  plus the  enhancements  to
RADVision's  complete V2oIP product family of gateways,  MCUs, and  gatekeepers.
Visitors  to the  RADVision  booth  will also be able to find out more about the
company's multi-protocol enabling software for IP communications including MGCP,
H.323 and SIP.

Products  and  services  from  RADVision's  partners  will be featured in the IP
challenge as well.

IP CHALLENGE  PARTNERS AND THEIR SOLUTIONS

Hewlett-Packard's  OpenCall is the communication  industry's most  comprehensive
line  of  mission-critical,  carrier-grade  platforms  for the  development  and
deployment  of  next-generation  services  over global voice and data  networks.
OpenCall  enables the  communication  industry to harness the convergence of the
Internet and telephony worlds. HP's OpenCall MultiService Controller platform is
built around RADVision's core gatekeeper technology.

                                     more...
<PAGE>

Vsys is a leading provider of software,  expertise,  and hosting center services
around which  next-generation  services and revenue streams are built.  The Vsys
Softswitch  enables voice, data and video to travel on interconnected and hybrid
networks,  from the  Internet  to the public  switched  telephone  network.  The
Softswitch enables a powerful new class of next-generation services for carriers
and application  developers alike.  Vsys' softswitch and RADVision's MP platform
are integrated into distributed conference solution.

congruency,  Inc. is a Communications  Application  Service Provider (CASP) that
has developed a next-generation  Voice over IP network that enables the delivery
of traditional and advanced  communications  application services over broadband
data networks. The congruency Communications Network enables carriers to provide
IP Centrex  telephone  capabilities,  directed visual content and enhanced voice
applications  to Internet  appliances.  The  congruency  Communications  Network
allows CLECs,  ISPs, and Building  tenant carriers to enhance their products and
services  beyond  commodity  transport.   congruency's   i.Picasso  touch-screen
business phone is embedded with RADVision's H.323 technology.

About RADVision

RADVision is a leading provider of products and technology that enable real-time
voice,  video  and data  communications  over  packet  networks,  including  the
Internet and other  networks based on the Internet  protocol or IP.  RADVision's
products and technology are used by RADVision  customers to develop systems that
enable  enterprises and service providers to use next generation packet networks
for  real-time  IP  communications.   RADVision  is  actively  involved  in  the
development of the industry  standards that are driving the emergence and growth
of the  use of  packet  networks  for  real-time  communications,  and  was  the
first-to-market  with  enabling  technology  and the  products  required for the
transmission  of  real-time  voice,  video and data over packet  networks.  As a
result,  RADVision  is well  positioned  to lead the market  with  products  and
technology that enable  enterprises and service providers to migrate their voice
and video communications from traditional  telephone networks to next generation
packet networks.  The company's products and technology include  standards-based
gateways,  conferencing  bridges,  gatekeepers and software  toolkits.  For more
information, please visit our website at: www.radvision.com.

About HP

Hewlett-Packard  Company -- a leading  global  provider of computing and imaging
solutions  and  services  -- is focused on making  technology  and its  benefits
accessible to individuals  and  businesses  through  simple  appliances,  useful
e-services and an Internet infrastructure that's always on.

Excluding Agilent Technologies,  HP has 86,000 employees worldwide and had total
revenue from  continuing  operations  of $42.4  billion in its 1999 fiscal year.
Information  about HP and its  products  can be found on the  World  Wide Web at
http://www.hp.com.

About Vsys

Founded in 1993 and  headquartered  in  Colorado  Springs,  Colorado,  Vsys is a
leading  provider of software,  expertise,  and hosting center  services  around
which next-generation services and revenue streams will be built. Vsys was among
the first in the  industry to develop a network  software  switch  platform,  or
softswitch.  The Vsys  softswitch  permits  voice,  data and  video to travel on
interconnected  and hybrid  networks,  from the internet to the public  switched
telephone   network.   The   softswitch   enables  a   powerful   new  class  of
next-generation   services  for  carriers  and  application   developers  alike.
Investors include RockMountain Ventures, of Colorado Springs,  Colorado.  Please
visit our website for further information: www.vsys.com.

                                     more...
<PAGE>

About congruency, Inc.

congruency,  Inc. is a Communications  Application  Service Provider (CASP) that
has developed a next generation  Voice over IP network  enabling the delivery of
traditional and advanced Voice over IP (VoIP) application services via broadband
data networks.  The congruency  Communication  Network offers premium  telephone
capabilities,  such as IP  Centrex,  directed  visual  content  and  enhanced IP
applications to highly competitive communication carriers, including competitive
local exchange carriers (CLECs),  Internet service providers (ISPs) and building
local exchange carriers (BLECs),  who are compelled to enhance their product and
services  beyond  commodity  transport.  congruency's  investors  include Vertex
Israel, ABS GE Capital Giza Fund, Nomura/Jafco Investments,  Matav Cable Systems
Media, Ltd., RSL Capital Corp., Pioneer Management and private investors.  Based
in  Rochelle  Park,  New  Jersey,   congruency   has   development   offices  in
Petach-Tikva, Israel.

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


<PAGE>

                                                                          ITEM 3

<PAGE>

For Immediate Release

Contact:

Karen Gurwitz              David Seligman              Robby Berman
Dir. Corp. Communications  CFO                         Director, Marketing
RADVision, Inc.            RADVision, Ltd.             congruency, Inc.
Tel: 201.529.4300, x305    Tel: 972.3.645.5446         Tel:Tel: 201.712.5590x117
[email protected]     [email protected]  [email protected]
www.radvision.com          www.radvision.com           www.congruency.com


           RADVision Teams with congruency, Inc. to Deliver Premium IP
                Telephony Services for the Emerging CASP Market

     PARTNERSHIP TO ENHANCE IP SERVICE OPTIONS FOR TELCOM SERVICE PROVIDERS

Mahwah,  NJ - June 2nd,  2000 -  RADVision,  Inc.,  (NASDAQ:RVSN),  the  leading
provider  of  award-winning,   industry-standard  products  and  technology  for
real-time voice and video communication over IP, and congruency, Inc., a leading
Communications  Application  Service  Provider  (CASP),  and provider of premium
telecommunications  services, today announced a long-term licensing agreement by
which congruency will integrate RADVision's market-leading H.323 technology into
its network and services for delivery over congruency's  i.Picasso  touch-screen
IP business phone.

"We  are  delighted  to  partner  with  congruency,"  said  RADVision   Business
Development  Director  Jacob  Hefer.  "We look  forward to playing a key role in
their  efforts to provide  premium IP services  to  competitive  local  exchange
carriers (CLECs),  Internet service providers (ISPs) and building local exchange
carriers (BLECs)."

congruency  delivers   next-generation  IP  Centrex  solutions  via  its  hosted
broadband  network,  enabling  the  carrier  class  market to offer  premium  IP
services to small and midsize businesses. Through this agreement, RADVision will
provide  core  technology  to  support  the  congruency  Communications  Network
infrastructure,   including  sophisticated  quality  controls  and  enhanced  IP
capabilities.

"By using RADVision's  technology,  we save critical  time-to-market and provide
our customer-base with a competitive edge in offering converged QoS voice, video
and data to their  customers,"  said congruency CEO Ralph Hayon,  founder of the
Communications  ASP model. "We selected  RADVision  because their building block
software technology is unparalleled in the industry for reliable,  carrier-class
quality and performance."

RADVision's  H.323 core  enabling  technology  enables the creation of real-time
voice and video  H.323  calls  over IP  networks.  The  H.323  protocol  toolkit
consists of H.225 that includes RAS,  RTP/RTCP,  Q.931 Call Signaling and H.245.
RADVision also offers  optional  modules for 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...


<PAGE>

In conjunction  with Hewlett Packard and Vsys,  RADVision and congruency will be
hosting "The IP Challenge", a live interactive game show, in the RADVision Booth
#1821, at SuperComm2000 in Atlanta, GA from June 6th to June 8th, 2000.

About RADVision

RADVision is a leading provider of products and technology that enable real-time
voice,  video  and data  communications  over  packet  networks,  including  the
Internet and other  networks based on the Internet  protocol or IP.  RADVision's
products and technology are used by RADVision  customers to develop systems that
enable  enterprises and service providers to use next generation packet networks
for  real-time  IP  communications.   RADVision  is  actively  involved  in  the
development of the industry  standards that are driving the emergence and growth
of the  use of  packet  networks  for  real-time  communications,  and  was  the
first-to-market  with  enabling  technology  and the  products  required for the
transmission  of  real-time  voice,  video and data over packet  networks.  As a
result,  RADVision  is well  positioned  to lead the market  with  products  and
technology that enable  enterprises and service providers to migrate their voice
and video communications from traditional  telephone networks to next generation
packet networks.  The company's products and technology include  standards-based
gateways,  conferencing  bridges,  gatekeepers and software  toolkits.  For more
information, please visit our website at: "http://www.radvision.com"


About congruency, Inc.

congruency,  Inc. is a Communications  Application  Service Provider (CASP) that
has developed a next generation  Voice over IP network  enabling the delivery of
traditional and advanced Voice over IP (VoIP) application services via broadband
data networks.  The congruency  Communication  Network offers premium  telephone
capabilities,  such as IP  Centrex,  directed  visual  content  and  enhanced IP
applications to highly competitive communication carriers, including competitive
local exchange carriers (CLECs),  Internet service providers (ISPs) and building
local exchange carriers (BLECs),  who are compelled to enhance their product and
services  beyond  commodity  transport.  congruency's  investors  include Vertex
Israel, ABS GE Capital Giza Fund, Nomura/Jafco Investments,  Matav Cable Systems
Media, Ltd., RSL Capital Corp., Pioneer Management and private investors.  Based
in  Rochelle  Park,  New  Jersey,   congruency   has   development   offices  in
Petach-Tikva, Israel.


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



<PAGE>

                                                                          ITEM 4
<PAGE>

For Immediate Release

Contact:

Karen Gurwitz               David Seligman              Amy O'Bryan
Dir. Corporate              CFO                         Corporate Communications
  Communications
RADVision, Inc.             RADVision, Ltd.             Vsys
Tel: 201.529.4300, x305     Tel: 972.3.645.5446         Tel:  719.785.5400
[email protected]      [email protected]  [email protected]
www.radvision.com           www.radvision.com           www.vsys.com

        RADVision and Vsys Join Forces to Deliver Carrier-Grade Solution
                       for VoIP Conferencing Applications

    HIGHLY RELIABLE, SCALABLE SOLUTION FOR DISTRIBUTED BRIDGING APPLICATIONS
         INTEGRATES MULTIPOINT CONFERENCING AND SOFTSWITCH TECHNOLOGIES

Mahwah, New Jersey,  and Colorado Springs,  Colorado - June 5, 2000 -- RADVision
Inc.  (NASDAQ:RVSN),  the leading provider of  award-winning,  industry-standard
products and technology for real-time voice and video communication over IP, and
Vsys, a leading provider of innovative softswitch solutions for both intelligent
networks (IN) and IP telephony,  today  announced a  carrier-grade  solution for
VoIP  conferencing  applications  that  integrates  RADVision's  new  Multipoint
Processor  (MP)  Conferencing  Platform  with  Vsys'  softswitch  solution.  The
combination  of  RADVision's  market  proven  IP-based  multipoint  conferencing
technology  and Vsys'  softswitch  enables the rapid  creation  of  conferencing
services  such as ACD,  Centrex and Class 5 public  "meet-me"  conferencing  for
next-generation converged networks.

RADVision's MP Platform was designed for  distributed  or decomposed  multipoint
solutions.  It consists of a hardware MP (media  processor)  for handling  media
mixing  plus a set of MP APIs for  supporting  any  third  party MC  (multipoint
controller) application that requires enhanced control of multipoint operations.
Vsys' carrier-grade VoIP conferencing  solutions uses Vsys' softswitch to handle
conference  logic and  signaling  to  maintain  a  centralized  single  point of
control,  while relying on RADVision  technology  to provide the mixing  engine.
RADVision's MP handles the media RTP/RTCP  protocol,  which is common to most IP
multimedia  protocols,  including  SIP,  H.323 and MGCP. The MP can therefore be
plugged into any voice or video over IP system.

"RADVision's  new MP provides us with the missing  component we needed to enable
next-generation   service   providers   to  develop   distributed   conferencing
applications using our softswitch  solution," said Bob Wise, Chief Architect for
Vsys. "The MP plugs perfectly into our  multi-protocol  environment and provides
conferencing capabilities in a hybrid PSTN/VoIP network."

Vsys' softswitch  solution provides a network  intelligence  layer that isolates
new converged services from the complexities of the underlying network. The Vsys
softswitch  manages user sessions and provides  routing  control  through hybrid
networks for both "pure"  IP-based  enhanced  service and services  that require
connectivity to the  traditional  PSTN. Its open systems  softswitch  technology
allows carriers and ASPs to develop and deploy new applications  quickly, key to
capturing subscribers and increasing service revenues.



                                     more...

<PAGE>

"We designed our MP platform for easy  integration  into  third-party  solutions
like Vsys'  softswitch that enables the development of highly efficient and cost
effective distributed conferencing solutions," said Ofer Shapiro, Vice President
of Strategic Accounts for RADVision.  "We believe that Vsys' softswitch solution
will   facilitate  the   introduction  of  a  range  of  exciting  new  enhanced
conferencing applications made possible by their solution."

According to Greg Baltzer, Vsys CEO, "Vsys has a longstanding relationship using
RADVision enabling  technology for real-time IP communication.  They are a clear
market leader with a track record of being first to market with  innovative  new
technologies.  It is only  natural  that we chose to  integrate  RADVision's  MP
platform  into  our  softswitch  solution.  No one  has  more  experience  in IP
conferencing than RADVision."

About RADVision

RADVision is a leading provider of products and technology that enable real-time
voice,  video  and data  communications  over  packet  networks,  including  the
Internet and other  networks based on the Internet  protocol or IP.  RADVision's
products and technology are used by RADVision  customers to develop systems that
enable  enterprises and service providers to use next generation packet networks
for  real-time  IP  communications.   RADVision  is  actively  involved  in  the
development of the industry  standards that are driving the emergence and growth
of the  use of  packet  networks  for  real-time  communications,  and  was  the
first-to-market  with  enabling  technology  and the  products  required for the
transmission  of  real-time  voice,  video and data over packet  networks.  As a
result,  RADVision  is well  positioned  to lead the market  with  products  and
technology that enable  enterprises and service providers to migrate their voice
and video communications from traditional  telephone networks to next generation
packet networks.  The company's products and technology include  standards-based
gateways,  conferencing  bridges,  gatekeepers and software  toolkits.  For more
information, please visit our website at: www.radvision.com.

About Vsys

Founded in 1993 and  headquartered  in  Colorado  Springs,  Colorado,  Vsys is a
leading  provider of software,  expertise,  and hosting center  services  around
which next-generation services and revenue streams will be built. Vsys was among
the first in the  industry to develop a network  software  switch  platform,  or
softswitch.  The Vsys  softswitch  permits  voice,  data and  video to travel on
interconnected  and hybrid  networks,  from the internet to the public  switched
telephone   network.   The   softswitch   enables  a   powerful   new  class  of
next-generation   services  for  carriers  and  application   developers  alike.
Investors include  RockMountain  Ventures,  of Colorado Springs,  Colorado.  For
additional information, please visit our website at: www.vsys.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





<PAGE>

                                                                          ITEM 5

<PAGE>

For Immediate Release

Contact:    Karen Gurwitz                          David Seligman
            Dir. Corporate Communications          CFO
            RADVision, Inc.                        RADVision, Ltd.
            Tel: 201.529.4300, x305                Tel: 972.3.645.5446
            [email protected]                 [email protected]
            http://www.radvision.com               http://www.radvision.com

           RADVision Introduces Unique Multipoint Processing Platform
                 for Distributed V2oIP(TM) Bridging Applications

        INNOVATIVE DECOMPOSED ARCHITECTURE IDEALLY SUITED FOR CUSTOMIZED
             NEXT-GEN CONFERENCING SOLUTIONS FOR CONVERGED NETWORKS

Mahwah, New Jersey,  June 5, 2000 -- RADVision Inc.  (NASDAQ:RVSN),  the leading
provider  of  award-winning,   industry-standard  products  and  technology  for
real-time voice and video  communication over IP, today announced its Multipoint
Processor Platform (MP Platform) for V2oIP multipoint conferencing solutions for
next-generation  converged networks.  The MP platform is a customizable solution
for distributed conferencing applications in multiple protocol environments.  It
is based on RADVision's award- winning  Multipoint  Conferencing Unit (MCU), and
can be integrated with any third-party IP-based PBX or switch.

"We designed the MP platform to meet the  requirements  of OEM partners who want
to maintain  control of their  bridging  application,  while  relying on a third
party to provide the mixing engine," said Dr. Michelle Blank,  Vice President of
Galactic  Marketing for RADVision.  "The MP Platform is another  first-to-market
technology  innovation from RADVision and an ideal solution for easy integration
into third party  solutions.  It allows our  partners to quickly  deploy  highly
efficient  and  cost  effective  distributed  conferencing  solutions  to  their
customers."

The essential functions of the multipoint conferencing system include switching,
signaling  and media  handling.  Traditionally,  these have been  combined  in a
single   entity,   using  a  Centralized   Architecture.   The  very  nature  of
packet-switching  IP networks now enables these functions to be separated into a
Distributed Architecture - an exciting breakthrough resulting in the opportunity
for  vendors  to  provide  customers  with  affordable  multipoint  conferencing
solutions.

The  RADVision  MP Platform  solution is based on the  decomposition  of the key
components of a multipoint conferencing  system--switching fabric, signaling and
media handling--working together in a distributed architecture.  The MP Platform
consists of a hardware Media Processor plus a set of APIs to support third-party
Multipoint  Controller  applications that require enhanced control of multipoint
operations. By functioning as a separate component, the MP can support a variety
of multipoint conferencing system requirements - it can be used both with simple
MCs that perform simple ad-hoc  conferencing,  and with complex MCs that perform
complex call control involving reservations,  supplementary  services,  multiple
signaling protocols, etc.

                                     more...
<PAGE>


About RADVision

RADVision is a leading provider of products and technology that enable real-time
voice;  video  and data  communications  over  packet  networks,  including  the
Internet and other  networks based on the Internet  protocol or IP.  RADVision's
products and technology are used by RADVision  customers to develop systems that
enable  enterprises and service providers to use next generation packet networks
for  real-time  IP  communications.   RADVision  is  actively  involved  in  the
development of the industry  standards that are driving the emergence and growth
of the  use of  packet  networks  for  real-time  communications,  and  was  the
first-to-market  with  enabling  technology  and the  products  required for the
transmission  of  real-time  voice,  video and data over packet  networks.  As a
result,  RADVision  is well  positioned  to lead the market  with  products  and
technology that enable  enterprises and service providers to migrate their voice
and video communications from traditional  telephone networks to next generation
packet networks.  The company's products and technology include  standards-based
gateways,  conferencing  bridges,  gatekeepers and software  toolkits.  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




<PAGE>


                                   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: June 5, 2000






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