The IMTC Event Will Be Held In Tel Aviv on October 8-12 and Will Focus on IMS Client Interoperability and 3G MONA Call Setup Time Reduction Technique

TEL AVIV (September 12, 2007) –

RADVISION (Nasdaq: RVSN), a leading provider of video network infrastructure and developer tools for unified visual communications over IP, 3G, and emerging next-generation IMS networks, today announced it will be hosting the IMTC (International Multimedia Telecommunications Consortium) Face-to-Face Interoperability Event for the second year in a row. This event will bring together the IMS and 3G-324M Activity Groups, who will meet to test the robustness and interoperability of IMS video sharing applications and 3G network issues, such as MONA implementations, H.264 and AMR-WB.

“This is the first time that IMS video share clients will be rigorously tested in a professional forum,” says Tsahi Levent-Levi, Chairman of the IMTC IMS Activity Group and a Product Manager at RADVISION. “We are proud to be spearheading these efforts, which will help operators roll out new and exciting services. We are confident that what we accomplish during the event will contribute a great deal to the industry.”

“The rapid adoption of both MONA (Media Oriented Negotiation Acceleration) and WNSRP (Windowed-Numbered Simple Retransmission Protocol) by both carriers and developers has advanced the 3G video communications industry significantly,” said Oren Libis, Chairman of the IMTC 3G-324M Activity Group and a Project Manager at RADVISION. “RADVISION was first-to-market with this solution for reducing call setup time. MONA and WNRSP have done much to improve the customer experience.” More detailed information on WNRSP, MONA, and call setup time can be found on RADVISION’s website.

The IMTC Face-to-Face Interoperability event will be hosted at RADVISION Tel Aviv headquarters on October 8-12, 2007.

About RADVISION

RADVISION (Nasdaq: RVSN) is the industry’s leading provider of market-proven products and technologies for unified visual communications over IP, 3G and IMS networks. With its complete set of standards-based video networking infrastructure and developer toolkits for voice, video, data and wireless communications, RADVISION is driving the unified communications evolution by combining the power of video, voice, data and wireless – for high definition video conferencing systems, innovative converged mobile services, and highly scalable video-enabled desktop platforms on IP, 3G and emerging next-generation IMS networks. For more information about RADVISION, visit http://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.

Source: RADVISION