RADVISION LTD
6-K, 2000-04-17
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 April 12, 2000.

2. RadVision Ltd. Press Release dated April 17, 2000.




<PAGE>



                                                                          ITEM 1

<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


               CHINA TELECOM CHOOSES RADVISION'S H.323 TECHNOLOGY
                       TO DEVELOP VOICE OVER IP SOLUTIONS

      FIRST COMMERCIAL IP TELEPHONY SYSTEM TO BE DEVELOPED BY CHINA TELECOM
           WILL USE RADVISION'S AWARD-WINNING H.323 ENABLING SOFTWARE

Mahwah,  NJ, April 12, 2000 -RADVision  (NASDAQ:RVSN),  the leading  provider of
industry-standard   products  and  technology  for  real-time  voice  and  video
communication  over IP, today announced a licensing  agreement under which China
Telecom will license  RADVision's market leading H.323 enabling software for the
development of the first IP telephony system in China.

China Telecom plans to create a VoIP communication solution that will be used by
call center  developers,  ISPs,  and  enterprise  clients.  The network  will be
interoperable across all major platforms.  China Telecom's long-term strategy is
to migrate  China's  TDN  telephony  system to an IP system.  By  replacing  the
backbone  exchange,  China  Telecom will have the first IP  telephony  system in
China to be based on industry-standard IP technology for real-time communication
over packet-based networks.

According  to  Bruce  BaiQing,  Engineering  Director  of the  project  at China
Telecom, "For our project, it was important to use an enabling software that has
been  market  tested  for   interoperability   and  reliability,   and  provides
compatibility  across  the  broadest  cross  section of  multi-vendor  products.
RADVision's technology meets our requirements."

"China Telecom has a vision for the future of communications in China and we are
very pleased they chose to use RADVision's  core technology to make their vision
a reality," said Shykeh Gordon,  VP Worldwide Sales.  "The China Telecom project
is a very important and exciting large scale effort. They will be able to reduce
their time to market by using our proven technology  building blocks,  and their
engineering teams can focus their energies on creating  innovations for the next
generation of carrier-class networks."

RADVision's  H.323  enabling   technology  will  enhance  China  Telecom's  VoIP
Communication  System by providing  flexibility  across  numerous  platforms and
support for a rich set of IP telephony features needed by call center developers
for computer telephony integration (CTI) functionality.


                                     more...

<PAGE>

RADVision's  H.323 core  protocol  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 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.

About China Telecom

China Telecom is the leading  provider of cellular phone services in the Chinese
mainland provinces of Guangdong,  Zhejiang,  and Jiangsu.  The Ministry of Posts
and Telecommunications  (MPT) has recently recognized that China Telecom will be
the only  cellular  telecommunications  services  company  operating in mainland
China and, under the MPT's control, it is listed on securities exchanges in Hong
Kong and outside China.  The MPT,  however,  does not  participate,  directly or
indirectly,  in the  provision  of cellular  telecommunications  services in any
province in which China Telecom currently operates or may operate in the future.

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  products  required  for  the
transmission of real-time voice, video and data over packet networks.  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.



                                       ###

                            All trademarks recognized



<PAGE>



                                                                          ITEM 2

<PAGE>


RADVISION

                                                                         SIEMENS

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

           Andreas Fischer
           Corporate Communications
           Siemens Information and Communication Networks
           Tel: +49 89 722-33988
           [email protected]
           http://www.siemens.com/ic/networks

                 Joint Press Release from Siemens and RADVision
                 ----------------------------------------------

          SIEMENS SIGNS LONG-TERM LICENSING AGREEMENT TO USE RADVISION
                            H.323 ENABLING TECHNOLOGY

  STRATEGIC ALLIANCE INCLUDES SIEMENS PURCHASE OF 1.6 MILLION RADVISION SHARES

Munich,  Germany/Tel  Aviv,  Israel -- April 17, 2000 - Siemens AG and RADVision
LTD (NASDAQ:  RVSN), the 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, today
announced that they have signed a strategic long-term agreement enabling Siemens
Information and Communication  Networks Group (ICN) to utilize RADVision's award
winning H.323 enabling  software for developing  IP-based products and solutions
within the  framework  of IP-based  product  architectures  of Siemens  ICN. The
licensing  agreement includes the H.323 core protocol and add-on modules such as
H.450 for  supplementary  services,  and H.235 for  security,  plus  RADVision's
gatekeeper technology.

Concurrent with RADVision's  recent IPO, Siemens purchased 1.6 million RADVision
shares. The shares were purchased from RADVision and certain shareholders.  Andy
W. Mattes, President of Enterprise Networks, Siemens ICN was recently elected to
RADVision's Board of Directors.

"Siemens and RADVision have enjoyed a fruitful  relationship  in the H.323 arena
for several years now," said Andy W. Mattes, President of Enterprise Networks, a
division of Siemens ICN. "The new agreements with RADVision show the strength of
Siemens commitments toward IP and IP-related partnerships,  both a major element
of HiPath, our recently announced Enterprise Convergence Architecture."

"The  cooperation  with  RADVision is a major point for our  successful  SURPASS
carrier product portfolio" said Dr. Winfried Buttner, President of Siemens ICN's
Wireline  Networks  division.  "H.323  is a key  element  in the  voice  over IP
functionality of SURPASS."



                                     -more-

<PAGE>

According to Ami Amir, RADVision's CEO, "We have always viewed Siemens as a very
important and strategic  partner.  Siemens and RADVision have been collaborating
now more than two years,  and the  investment,  Andy Mattes's board position and
the umbrella  agreement all are extremely  positive  actions that further cement
our relationship."

HiPath  supports an application  portfolio for web-based  integrated  voice-data
solutions  such  as  customer  relationship  management,  multimedia  messaging,
e-business,    collaboration   and   mobile   working.    Siemens   SURPASS   is
Voice-over-IP/ATM technology for the convergence of voice and data networks that
is  tailored to the needs of carriers  and service  providers.  Based on an open
architecture,  it brings to data  networks  the high  quality and  voice-service
versatility of real-time voice networks.  Conversely,  it also makes it possible
to use IP applications in the voice network. The evolutionary concept of Surpass
ensures that the existing  network  infrastructure  can continue to be used to a
great extent.

RADVision's  family of H.323 software products performs all the functions needed
to  establish  and  manage  real-time  voice/video/data  communication  over  IP
networks,  and is part of the  RADVision  V2oIPTM  product  family,  which  also
includes  MGCP  (Media  Gateway   Control   Protocol)   enabling   software  and
standards-based gateways and conferencing bridges.

About Siemens, Information and Communication Networks Group

The Information  and  Communications  business  segment is part of Siemens AG, a
global  powerhouse in electrical  engineering and electronics with more than $75
billion in sales.  Information and  Communications  consists of the three groups
Information and Communication  Networks (51,500  employees,  $10 billion sales),
Information and Communication  Mobile (20,000  employees,  $5 billion sales) and
Siemens Business Services (34,000 employees, $5,5 billion sales).

Information  and  Communication  Networks is an integral part of Information and
Communications.  As  Solution  Provider of voice,  data  networks  and  services
Information and Communication  Networks has a comprehensive  product portfolio -
producing and supplying  complete systems,  enterprise  products,  switching and
transmission  equipment - and many years of  consulting  experience in planning,
setting up, and operating networks.

Further     information     can    be    found    on    the     Internet     at:
http://www.siemens.com/ic/networks/
- -----------------------------------


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  products  required  for  the
transmission of real-time voice, video and data over packet networks.  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.

                                     more...

<PAGE>


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 17, 2000






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