Companies Also Agree to Explore Joint Development Efforts

REDWOOD SHORES, CA and RA’ANANA, Israel – April 25, 2006 – Avistar Communications Corp. (NASDAQ: AVSR), a desktop video collaboration platform provider, and its wholly-owned subsidiary, Collaboration Properties, Inc. (CPI), today announced that CPI has entered into an assignment agreement to license CPI’s extensive patent portfolio on a royalty bearing, non-exclusive, worldwide basis to Emblaze-VCON Ltd., a leader in providing IP solutions for Corporate Virtual Meetings and a member of the Emblaze Group (LSE: BLZ).

Under the assignment agreement, CPI granted Emblaze-VCON a royalty-bearing license according to its standard terms and conditions for the field of videoconferencing. The companies are also exploring the opportunity to jointly research and develop new desktop video collaboration solutions. 

“The relationship we’ve established with Emblaze-VCON is part of an overall quickening of interest and adoption currently pushing ever broader use of desktop video applications in the global market,” said Gerald J. Burnett, Chairman and CEO of Avistar. “This licensing agreement provides us a launch pad for working together to build momentum in visual communications – wherever you’re working, whenever you’re working.”

Added Naji Sourani, VP R&D Emblaze-VCON, “This new agreement dovetails with the vision for our overall group offering and brings cutting-edge desktop video capability to our ever-increasing range of solutions, technologies and products geared toward supporting next-generation services.”

About Avistar Communications Corporation

Avistar Communications Corporation develops, markets, and supports a video collaboration platform for the enterprise, all powered by the AvistarVOS™ software. From the desktop, Avistar delivers business-quality video calling, recording, publishing to web and e-mails, video-on-demand, broadcast origination and distribution, and document sharing.  Avistar video-enables business processes by integrating visual communications into the daily workflow and connecting communities of users within and across enterprises. Founded in 1993, Avistar is headquartered in Redwood Shores, California, with sales offices in New York and London. Avistar’s technology is used in more than 35 countries.

Collaboration Properties, Inc. (CPI), a wholly owned subsidiary of Avistar, holds a current portfolio of 70 patents for inventions in the primary areas of video and network technology. CPI pursues patents for presence-based interactions, desktop video, recorded and live media at the desktop, multimedia documents, data sharing, and a rich-service network video architecture to support Avistar’s product suite and customers. CPI offers licenses to its patent portfolio and Avistar’s video-enabling technologies to companies in the video conferencing, rich-media services, public networking, and related industries. 

About Emblaze-VCON

Emblaze-VCON develops and manufactures a variety of conferencing solutions that enable seamless communication and collaboration using all forms of interactive media. The company's award-winning technology ensures the highest audio and video performance for organizations worldwide. Emblaze-VCON 's meeting and collaboration solutions include desktop and group videoconferencing products, audio conferencing products, data conferencing products and management systems. The company markets its products and services through a network of reseller partners, OEMS and value-added resellers around the world. Emblaze-VCON has worldwide headquarters in Israel and regional offices in Munich , Paris, New Jersey and Beijing.

About Emblaze Ltd

Emblaze Ltd is a group of companies sharing a common mission to provide telecom operators with technologies, products and solutions for next generation services: Emblaze Mobile, a new breed in handsets design and manufacturing; Emblaze-VCON, is a leading provider of wireless video communications technologies and conferencing solutions for operators and enterprise markets over IP networks; Orca Interactive (LSE: ORCA), provider of Interactive Television IPTV middleware for Video On Demand (VOD) and broadcast services, aimed at Telecom, cable and xDSL operators; Emblaze SmartContent, developer of highly advanced technology for Content-Push over wireless and IP networks to mobile devices and personal computers; emoze, a free global Push Email service for mobile devices that will push send your Emails and PIM data to you anywhere and to any device and Visual Defence (LSE: VDI), a provider of wireless and IP video solutions for military and homeland security markets.