RADVISION Launches New Version of Click to Meet Delivering Major Enhancements to Video Experience and Quality

Click to Meet Enhancements Continue to Extend the Features and Experience of Microsoft’s Unified Communications Solutions

FAIR LAWN, New Jersey, June 26, 2006 – RADVISION LTD (Nasdaq: RVSN), a leading provider of multimedia communications platforms and development tools,  today announced the availability of an enhanced version of its award-winning Click to Meet™ conferencing application.  RADVISION’s Click to Meet will now support Microsoft’s RTVideo advanced video codec, a new suite of high fidelity audio codecs, the addition of media encryption and improvements to bandwidth management and network boundary traversal. 

Click to Meet is a scalable conferencing platform that can add multiparty video and VoIP audio capabilities to Microsoft Office Communicator 2005 and Microsoft Office Live Meeting applications, providing a rich conferencing experience.  It also provides the option to extend the reach of Office Communicator 2005 and Office Live Meeting conferences by providing connection to traditional videoconferencing systems, telephones, cell phones and 3G video phones.

RTVideo is Microsoft’s advanced video codec providing high quality video communications over IP networks.  The RTVideo codec is based on the SMPTE VC-1 Standard (SMPTE 421M) and is the preferred codec used by Communicator 2005 for point to point video calls.  Now through RADVISION’s Click to Meet for Microsoft Office, it can be used for multipoint communications displaying high quality multiparty video inside Communicator 2005.

Additional enhancements to Click to Meet include:

• A new suite of high fidelity audio codecs providing high audio quality even in the case of lost or delayed IP packets.
• Encrypted communications providing complete end-to-end security.
• Improvements in network boundary traversal for secure and transparent communications in complex security environments including proxies supporting IPSec (Internet Protocol Security).
• Advanced bandwidth management which dynamically changes the video and audio codecs to adjust for varying network conditions including packet loss and network latency while maximizing the user experience.

“RADVISION continues to play a significant role in the development of real-time collaboration solutions that enhance Microsoft’s Unified Communications platform,” said Marc Sanders, group product manager in the Unified Communications Group at Microsoft Corp. “Information workers today want a high-quality conferencing experience that includes video, and they want to join on whatever device is available to them or is most appropriate for the specific meeting. RADVISION’s Click to Meet for Microsoft Office provides this by extending the boundaries and functionality of the Microsoft Office system communication solutions.”

“RADVISION has been a long time supporter of Microsoft collaboration solutions and we share a common vision of Unified Communications that will allow information workers to communicate and collaborate more effectively with colleagues, customers and partners,” said Killko Caballero, Senior Vice President of Enterprise Strategy at RADVISION. “Microsoft’s Unified Communications platform coupled with RADVISION’s Click to Meet for Microsoft Office delivers on this vision by connecting islands of communications devices and taking the complexity out of communications.”

RADVISION plans to continue working with Microsoft on enhancements to updated versions of Live Meeting and Communicator 2005 (Microsoft Office Communicator 2007) upon availability.

About RADVISION

RADVISION (Nasdaq: RVSN) is the industry’s leading provider of high quality, scalable and easy-to-use products and technologies for video conferencing, video telephony, and the development of converged voice, video and data over IP and 3G networks. 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 Exchange Commission, including RADVISION’s Form 20-F Annual Report. These documents contain and identify other important factors that could cause actual results to differ materially from those contained in our projections or forward-looking statements. Stockholders and other readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date on which they are made. We undertake no obligation to update publicly or revise any forward-looking statement.