With This Release, RADVISION Further Strengthens Its Position as a Leader in the Emerging Market for IMS Developer Solutions

TEL AVIV (August 07, 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 and general availability of the SIP Developer Suite version 5.0. The SIP Developer Suite is a highly versatile development tool for building all types of IMS or non-IMS SIP applications, ranging from high-end infrastructure SIP systems to compact embedded devices. The SIP Developer Suite provides high performance, feature-rich functionality with high flexibility, customizability and extensibility.

The SIP Developer Suite includes a rich set of toolkits, add-ons, and packages designed to meet every SIP development challenge, all of which support the latest 3GPP and TISPAN IMS SIP standards. These include signaling compression, security agreement, IMS registration and more, SIMPLE OMA standard compliant Presence and Instant Messaging capabilities, XML support, and latest STUN standard NAT Traversal capabilities.

“With the release of the SIP Developer Suite, RADVISION opens the door to the next stage in the evolution of converged, next generation IMS networks,” said Sagi Subocki, Product Manager with RADVISION’s Technology Business Unit. “The SIP Developer Suite, including IMS, STUN NAT Traversal, and Presence and IM capabilities, offers many new opportunities for IMS mobile and fixed terminal vendors.”

The SIP Developer Suite is part of the RADVISION IMS Express (TM), the most comprehensive solution for developers of next-generation IMS network elements, which includes the RADVISION SIP Server Platform, DIAMETER, MEGACO and RTP Toolkits and the ProLab(TM) IMS Testing & Analysis solution.
Coded in ANSI C and cross-platform compatible, the SIP Developer Suite is available for all common operating systems. It features an open, object-oriented architecture, which makes it programmer-friendly and highly flexible. It provides multiple API layers and is inherently designed to offer both extensive functionality and complete flexibility.

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