Joint marketing and development efforts will bring new interactive mobile video telephony client application to market * See live demo at VON Fall 2007 in Boston

TEL AVIV (October 29, 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 today that it has joined forces with Clique Communications, Inc., a leading provider of IP video communication solutions, to jointly develop a new video telephony client application for mobile devices. The mobile video client application, focused on delivering superior video quality and an enhanced user experience, is being developed using RADVISION’s Multimedia Terminal Framework.

By bundling RADVISION’s SCOPIA Interactive Video Platform with the new Mobile Video Telephony (MVT) application, RADVISION is uniquely poised to deliver an end-to-end solution to mobile operators who want to drive revenue-generating interactive video services, such as video communities and conferencing, participation TV, Mobile surveillance and monitoring, video contact centers and more.

“Our partnership with RADVISION is an important component of our mobile strategy,” said John Vitale, Director of Business Development and Strategic Partnerships for Clique Communications. “The new MVT client will be compatible with the nearly endless range of services that can be developed using the SCOPIA Interactive Video Platform. We believe this will usher in a new era of revenue-generating video services on pre-IMS and evolving IMS networks.”

RADVISION’s Multimedia Terminal Framework allows application developers to focus on application development, hardware integration and user interaction rather than complex VoIP standards when developing Customer Premise Equipment (CPE) devices, such as IADs and WiFi Phones. This enables faster time-to-market. The framework is a complete solution, encompassing signaling, call control and media management. The SCOPIA Interactive Video Platform is an IMS-ready, carrier-grade video-enabled media server with flexible APIs for development and deployment of multiple interactive advanced multimedia services in converged networks.

“This joint development effort is a real springboard for full IMS deployment, and complements our existing offerings in the mobile space,” said Tsahi Levent-Levi, Product Manager for RADVISION Technology Business Unit. “RADVISION offers a complete line of technology products to develop IMS clients. Our cooperation with Clique positions us to provide client application level solutions using the jointly developed MVT and addresses the needs of customers like service providers with turn-key application solutions that go beyond our existing product line of enabling technology tools.”

The Mobile Video Telephony client is available now from RADVISION or Clique for customer demonstrations. Customization with carriers and OEM’s of a SIP and H.264 compliant Video Telephony Client is planned for late Q4 2007.

The new Mobile Video Telephony application will be showcased at the RADVISION Booth #537 at VON Fall 2007 in Boston October 29-November 1.

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 www.radvision.com.

About Clique Communications

Located at the core of “Einstein’s Alley”, Princeton, NJ, Clique Communications offer exclusive patented technologies for video and mobile communications. Clique’s highly experienced engineering teams continuously deliver universal multi-media solutions for a variety of viewing mediums – PC, mobile, TV. Network Operators and Service Providers choose Clique’s innovative solutions and services to consistently generate new revenues and differentiate their broadband and digital voice services by offering converged video communications solutions. For more information visit www.cliquevideo.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