Avistar Subsidiary Announces Key Real-Time Communications Patent

Includes Coverage on Networked Real-Time Text (Instant Messaging) and Video Communications

REDWOOD SHORES, Calif.--(BUSINESS WIRE)--Collaboration Properties, Inc. (CPI), a wholly owned subsidiary of desktop video provider Avistar Communications Corp. (NASDAQ:AVSR), today announced that CPI has been awarded U.S. patent 7,152,093 in the area of real-time communications.

“This patent, our 74th, is yet another validation of our early innovations in collaboration and communications and it, along with its sibling patents and applications, are part of our ongoing program to expand our patent portfolio and the protection it provides for Avistar’s technology”

The patent, which has 57 claims, covers important concepts in networked real-time text and non-text communications. The patent is directed to real-time communications systems, including systems where communications are initiated from a display, such as a "buddy list," and are routed based on users' log-in locations. Service records identifying the users and the log-in locations can be stored on multiple servers. In the past several years real-time text and video Instant Messaging systems have become widely available from a variety of technology providers.

“This is one of a series of patents and applications that are based on the rich technical disclosure in our original 1993 patent filing,” said Dr. Anton F. Rodde, president of CPI. “Because our 1993 patent filing disclosed so many foundational communications concepts, CPI has broad patent protection for many of the concepts used in today’s networked communications environments.”

“This patent, our 74^th, is yet another validation of our early innovations in collaboration and communications and it, along with its sibling patents and applications, are part of our ongoing program to expand our patent portfolio and the protection it provides for Avistar’s technology,” said Gerald J. Burnett, chairman and CEO of Avistar.

CPI makes its intellectual property available to Avistar and potential partners and licensees through an active licensing program.

Inquiries for licensing of CPI’s patent portfolio may be directed to Paul Carmichael, licensing advisor, through arrangement with Stephanie Neutz, Esq., patent legal counsel, at [phone].

About Collaboration Properties and Avistar Communications Corporation

Collaboration Properties, Inc. (CPI), a wholly owned subsidiary of Avistar Communications Corporation, was founded in 1997. CPI develops patents for presence-based interactions, desktop video, recorded and live media at the desktop, multimedia documents, data sharing, and a service-rich video network architecture. It holds a current portfolio of 74 patents for inventions in the primary areas of video and network technology. 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. Current licensees include Sony Corporation, Polycom, Inc., and Emblaze-VCON.

Avistar 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 40 countries.

For more information on CPI patents, visit www.collabprop.com. For information on Avistar and Avistar products, visit www.avistar.com.

Forward Looking Statements

This press release contains forward-looking statements including statements regarding the scope and significance of the real time communications patent and CPI’s ongoing program to expand its patent portfolio and the protection it provides. Such statements are subject to risks and uncertainties that could cause actual results to differ materially, including such factors, among others, as technical limitations, the development of competitive technologies and solutions, changes in domestic and international laws regarding the protection of intellectual property, and the challenges associated with enforcing intellectual property rights in the United States and abroad. These and other risk factors are discussed in Avistar’s Annual Report on Form 10-K and Quarterly Reports on Form 10-Q filed with the Securities and Exchange Commission from time to time. Avistar disclaims any intent or obligation to update these forward-looking statements.

Copyright (c) 2006 Avistar Communications Corporation. All rights reserved. Avistar, AvistarVOS, and Avistar logos are trademarks or registered trademarks of Avistar Communications Corporation. Other company, product or service names may be trademarks or service marks of others.