RADVISION’s Chairman Purchases 247,038 Additional RADVISION Shares

TEL AVIV, Israel, September 5, 2005 -RADVISION (Nasdaq: RVSN) today announced that during the week of August 21, 2005, Zohar Zisapel, RADVISION’s Chairman of the Board, purchased 247,038 shares of the Company in the open market. The total amount invested by Mr. Zisapel in the open market was approximately $2.94 million.

About RADVISION

RADVISION LTD. (Nasdaq: RVSN) is the industry’s leading provider of high quality, scalable and easy-to-use products and technologies for videoconferencing, video telephony, and the development of converged voice, video and data over IP and 3G networks.  For more information please visit our website at www.radvision.com.