RADVISION Confirms Chairman's Purchase of Additional Shares

FAIR LAWN, NJ, September 15, 2005 RADVISION (Nasdaq: RVSN) today confirmed that Zohar Zisapel, RADVISION’s Chairman of the Board, purchased 247,038 shares of the Company in the open market during the week of August 21, 2005. The total amount invested by Mr. Zisapel for these shares was approximately $2.94 million.

Mr. Zisapel commented: “RADVISION continues to remain at the technology forefront in the rapidly emerging market for videoconferencing and data collaboration. The opportunity we see for this Company continues to solidify and expand.  We are fully focused on realizing that opportunity.”

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.