New Release Includes the ProLab IMS Testing Solution, Part of the IMS Expressâ?¢ — the Complete IMS Developer Suite

TEL AVIV (September 11, 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 the release of Version 5.0 of its ProLab Testing Suite, a comprehensive testing solution for voice and video over IP, IMS and 3G networks.

A pioneer in the area of media quality testing & analysis, RADVISION’s ProLab Testing Suite is a leading force in the industry. The suite is deployed throughout the world at major device manufacturers, network equipment providers, testing labs and service providers. RADVISION’s ProLab Testing Suite allows vendors and service providers to perform the rigorous testing and validation needed to ensure high quality, dependable product deployment. Based on RADVISION’s award-winning protocol toolkits, know-how and technological expertise in IMS, multipoint video over IP, and across the board interoperability, this powerful testing tool complies with the industry’s most recent standards.

This most recent version of the ProLab Testing Suite comes complete with an IMS testing solution with both IMS Terminals and IMS Servers. These include terminal emulation for High Definition generation and an IMS Server for simulating IMS Core Networks.

“The ProLab Testing Suite provides a complete testing solution for emerging IMS and IMS SIP products,” said Eli Cohen, Product Manager with RADVISION’s Technology Business Unit. “ProLab also performs media and protocol analysis, including packet distribution, packet loss, bandwidth, errors, and more.”

The media analysis and quality tools support analysis of RTP traffic and standard-based voice and video quality. This includes support for analysis of expected call flow, including call details and full automation to minimize testing time and deliver faster time-to-market.

With the ProLab Testing Suite, automated full regression testing can be conducted for components prior to release. Entire network systems can be emulated and tested prior to deployment, and end user service problems can be evaluated. Advanced tests and analysis, includes analyzing packet or frame loss, delay, and jitter checking. In addition, the ProLab Testing Suite simulates different network topologies.

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.

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