RADVISION and Ingate Systems Partner to Provide Multipoint Conferencing for Microsoft Unified Communications Platform Across External Networks

Market Wire, September, 2006

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.

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RADVISION Contacts: Corporate Contact: Tsipi Kagan Chief Financial Officer Tel: 201-689-6340 Email Contact Media Relations: Kristin Conforti Dukas Public Relations Tel: 516-320-6839 Email Contact Investor Relations: June Filingeri Comm-Partners LLC Tel: 203-972-0186 Email Contact Ingate Contact: Hillary Call Ingate Systems Tel: 917-414-9262 Email Contact