RADVISION LTD
6-K, 2000-04-11
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 April 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


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<PAGE>




                                 RADVISION LTD.





6-K Items


1. RadVision Ltd. Press Release dated March 27, 2000.

2. RadVision Ltd. Press Release dated March 28, 2000.




<PAGE>



                                                                          ITEM 1

<PAGE>

RADVISION

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]


          RADVision, The V2oIPTM Experts, Announces Version 2.6 of its
                      Award-Winning H.323 Protocol Toolkit,
          Optimized For Carrier Grade Applications and Embedded Systems

                  MARKET LEADER OFFERS SMALLEST FOOTPRINT WITH
              COMPREHENSIVE ITU FEATURE SET AND HIGHEST PERFORMANCE


Mahwah,  NJ,  March 27,  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 Version 2.6 of
its award-winning H.323 Protocol toolkit,  optimized for demanding carrier grade
applications and embedded systems.  RADVision's unique architecture and abstract
API  provides  a highly  efficient  implementation  that  addresses  the  design
requirements  for a broad class of products  including chip sets,  hand-held and
desktop  endpoints,   and  high-end  network  infrastructure  devices  including
gateways,   gatekeepers,  next  generation  switches  and  IP  service  creation
platforms.


INNOVATIVE ARCHITECTURE AND ABSTRACT API DELIVERS ADVANCED  FUNCTIONALITY,  HIGH
PERFORMANCE AND COMPACT CODE.

"It takes tremendous  technological innovation and know-how to offer the richest
set of H.323  features in a 450K footprint that also includes an abstract API to
simplify application programming and upgrading. Our abstract API design provides
our customers with both flexiblity and important time to market advantage - it's
a hallmark of all our V2oIP technology." says Ami Amir, RADVision CEO. According
to Amir, "Our engineers are the experts in real-time voice and video  technology
and products.  That's why we are the only vendor to offer H.323  technology that
handles the state machines and inter-protocol  interactions within our stack. No
one can match our combination of rich functionality, speed and compact code."

RADVision's  H.323 Protocol  Stack  includes a package of software  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 with also includes MGCP  toolkits.  Designed to be platform  independent,
version 2.6 of  RADVision's  H.323  protocol  toolkit  will be  available  for a
variety  of  operating  systems  including  pSOS,  VxWorks  (Tornado),   Windows
98/NT/2000, Solaris Sparc, Alpha, and Linux.


                                     -more-

<PAGE>

RADVISION  PERFORMANCE  CHALLENGE  AT VON  SPRING  FOCUSES  ON IMPACT OF NETWORK
CONSIDERATIONS ON ASSESSING H.323 PERFORMANCE

At VON Spring 2000 in San Jose during March 27-30, visitors to RADVision's booth
#405/407 can  participate in the RADVision  Performance  Challenge and learn all
about how to assess H.323  performance in call scenarios of varying  complexity.
RADVision's  Performance  Challenge  handout  includes  guidelines for measuring
H.323 performance and presents  performance results for version 2.6 running on a
750 Mhz IntelTM  Pentium TM III  processor-based  systems.  Performance  results
range  from  1400  call  per  second  for lab  tests  that do not  take  network
considerations  into  account to 100 calls per second  for more  realistic  test
scenarios  which  include  networking  considerations.  Performance  results are
contrasted to real world  performance of 40 calls per second for average central
office switches in circuit-switched networks.

RADVision's  V2oIP family of enabling  technology for real-time  voice and video
communication  over IP  technology  allows  OEMs/developers  to rapidly bring to
market  interoperable   standards  compliant  products  and  services  for  next
generation  converged  networks.  The company's  impressive list of IP telephony
toolkit licensees includes industry giants and innovative startups.  RADVision's
H.323 protocol has been  implemented in IP  communication  products and services
from Cisco, HP, Nortel, Siemens, Mitel, Dialogic, Natural Microsystems, Polycom,
Telogy Networks, White Pine and many others.


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
products and technology are used to develop systems that enable  enterprises and
service  providers  to  migrate  their  voice  and  video   communications  from
traditional telephone networks to next generation packet networks.

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.

                                       ###
                            All trademarks recognized







<PAGE>



                                                                          ITEM 2

<PAGE>

RADVISION




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]


        RADVision Ships MGCP Toolkits and Showcases MGCP Interoperability
                             at VON Spring 2000 with
                        Texas Instruments and AudioCodes

   RADVISION MGCP TOOLKITS SUCCESSFULLY TESTED WITH MORE THAN A DOZEN VENDORS
                          AT PACKETCABLE INTEROP EVENT

Mahwah, New Jersey, March 28, 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 the immediate
availability  of its suite of MGCP (Media Gateway  Control  Protocol)  toolkits,
providing  building blocks for Next Generation  Media Gateways and Media Gateway
Controllers.

NEWEST IP TOOLKITS FROM V2OIP EXPERTS  SHIPS AFTER  SUCCESSFUL  INTEROPERABILITY
TESTING

At the recent  MGCP  interop  event  hosted by  PacketCable,  March 6th
through 10th, in Denver, CO, RADVision successfully tested its client and server
MGCP  toolkits  with  more than a dozen  vendors.  As the  technology  leader in
standards   based  building  blocks  for  real-time  voice  and  video  over  IP
communications,  RADVision  has a  longstanding  reputation  as the champion for
interoperability.  Since 1996,  the company  has been a regular  participant  in
interop  events hosted by industry  consortia  bodies such as the IMTC, and more
recently, at PacketCable and SoftSwitch MGCP interops.

At VON Spring 2000 in San Jose, California,  from March 28 to 30, RADVision will
be demonstrating MGCP interoperability with Texas Instruments,  (NYSE:TXN),  the
world's market leader in digital signal processors (DSP),  analog,  and software
for voice over packet applications, and AudioCodes Ltd. (NASDAQ:AUDC), a leading
provider of enabling  technologies and communication system components for voice
over packet  networks.  The  demonstration  will show  interoperability  between
AudioCode and TI's Media Gateways  software and  RADVision's  simulated IP Phone
and Call Agent using RADVision's MGCP stack.

MGCP  separates  the  signaling,  call  control and media  internetworking  into
distinct, logical entities for gateway decomposition  architectures.  MGCP-based
products  and services  include two  sub-components,  the Media  Gateway and the
Media Gateway  Controller.  The Media Gateway is responsible  for handling media
endpoints,  resources and connections. MGCP is a complementary protocol to H.323
that was  designed  for direct  session  setup and control  between  intelligent
endpoints on an IP network.

                                     -more-

<PAGE>


RADVision's  first  generation  MGCP  toolkits  are  based  on the  latest  MGCP
specification  -- MGCP 1.0,  and support  the  MGCP/NCS  profile  adopted by the
CableLabsTM  consortium.  The IETF (Internet  Engineering  Task Force) and ITU-T
(International  Telecommunications  Union - T)  are   working  closely   on  the
development  of MGCP. The new protocol that is evolving out of this joint effort
is the  H.248/MEGACO.  As a  participant  in this effort,  RADVision was able to
design its MGCP  toolkits in a way that allows for easy  migration to compliance
with the emerging H.248/MEGACO protocol.

The  evolution  of the MGCP,  its  architecture  and  relationship  to H.323 are
discussed in a RADVision MGCP overview,  available at RADVision's  booth #405 at
VON. After March 30th, the overview will be available on the RADVision website.

RADVision's  MGCP  toolkits  are the  newest  addition  to its  family  of V2oIP
developer toolkits for real-time voice and video over IP. All RADVision toolkits
are modular and include extensive APIs, which can be tailored to suit customers'
needs. RADVision's new family of MGCP toolkits includes:


o    MGCP MGC protocol for building MGCP compliant Media Gateway Controllers

o    MGCP MG protocol for building MGCP compliant voice over IP Media Gateways

o    Testing Tools: IP Phone, Call Agent & Monitor

o    Standard set of optional MGCP packages

o    SNMP Agent/Sub  Agent MIBs Interface for Network  Management  with Java GUI
     Configuration Applet

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
products and technology are used to develop systems that enable  enterprises and
service  providers  to  migrate  their  voice  and  video   communications  from
traditional telephone networks to next generation packet networks.

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.


                                       ###

                            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: April 11, 2000






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