Avistar Systems UK, a wholly owned subsidiary of Avistar Communications Corporation (NASDAQ:AVSR), has helped clients using its desktop video solution maintain productivity and minimize the revenue impact of the tube strike that hit London on September 4th and the morning of September 5th.

Avistar's suite of video collaboration tools allows employees to be anywhere, anytime whilst being face-to-face with clients, partners and other team-members. Avistar's video solution is available on the desktop or laptop, and can be utilised by accessing a corporate network through a VPN connection when offsite. Avistar users are thus in a position to remain productive when out of the office for any reason, whether planned or unplanned.

Doug Cullen, Managing Director EMEA, Avistar said: ?When I realised the strike was on, I requested our London staff stay at home with only unavoidable duties carried out from our offices. As a result of our video technology, we were able to service our clients in Asia and Europe, engage with our partners and otherwise operate normally. Without our solution ? available for as little as £25 per user per month ? I estimate the cost impact to have been around £65 per employee per hour.?

Simon Moss, President of Avistar, said: ?Given today's state of technology, any company is in a position to plan for disruptions to employees' revenue-generating capabilities. The challenge in the UK - compared with the US and Europe - remains overcoming the fibre shortage for high-speed Internet access at home and in non-urban areas. Avistar's variable bandwidth technology addresses this challenge and helps allow businesses realise the promise of Unified Communications, today.?

In the financial services industry, where Avistar has sold over 16,000 seats, unrealized revenues due to business disruptions are measured in the millions of pounds per hour. To minimize these losses, Avistar's video solution is already part of various corporate business continuity programmes that include remote virtual desktop presence and data back-up.

About Avistar Communications Corporation

Avistar Communications Corporation develops, markets and supports a video over-IP 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 San Mateo, California, with offices in New York and London. Avistar's technology is used in more than 40 countries.

Collaboration Properties, Inc. (CPI) is a wholly owned subsidiary of Avistar Communications Corporation. CPI develops patents for presence-based interactions, wireless communications, desktop video, recorded and live media at the desktop, instant messaging, multimedia documents, data sharing and a service-rich video network architecture. It holds a current portfolio of 76 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., Tandberg ASA, Radvision Ltd. and Emblaze-VCON.

For more information, visit www.avistar.com.

Copyright (c) 2007 Avistar Communications Corporation. All rights reserved. Avistar and the Avistar logo are trademarks or registered trademarks of Avistar Communications Corporation. All trademarks, trade names, service marks, and logos referenced herein belong to their respective companies.

Avistar
Axel Kirstetter, +44-0-20-7382-1565
akirstetter@avistar.com