RADVISION Names Adi Sfadia as New Chief Financial Officer

Tel Aviv, June 11, 2008 – 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, announced today that Adi Sfadia will succeed Tsipi Kagan as Chief Financial Officer effective July 30. Mr. Sfadia had served as Vice President of Finance for RADVISION until he joined Alvarion Ltd., a WiMAX and wireless broadband solutions provider, in that post in January 2008. Ms. Kagan’s plan to leave RADVISION was announced on May 1.

Mr. Sfadia, 38, joined RADVISION in 2004 as corporate controller. Prior to joining RADVISION, Mr. Sfadia served in several senior financial positions in Israeli companies, where he gained wide financial and managerial experience. Mr. Sfadia spent five years in public accounting with Ernst & Young Israel. Mr. Sfadia holds a BA in Business Administration and an MBA, magna cum laude from The College of Management in Tel Aviv and Rishon Letzion and he is a Certified Public Accountant.

Boaz Raviv, Chief Executive Officer, commented: “We are very pleased that Adi Sfadia will return to RADVISION as our Chief Financial Officer. His experience with us will ensure a seamless transition and his strong background in finance makes him well suited to lead our finance group. We welcome him to our management team and look forward to his contribution in building RADVISION’s future.”

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.