Avistar Adds Zultys to Its Growing List of Industry Leading Technology PartnersZultys Licenses the Avistar C3 Media Engine™ – Power

San Mateo, Calif., March 11, 2009 -- Avistar Communications Corp. (Nasdaq: AVSR), a leaderin unified visual communications solutions, announced today that Zultys, Inc., a leading providerof all-in-one unified communication solutions, will integrate Avistar’s C3 Media Engine and makeit available to its customers around the world. Through this agreement, Zultys customers willhave the ability to add best-in-class desktop videoconferencing to their unified communicationssystems. Zultys plans to launch the integrated solution in the fall of 2009.Simon Moss, CEO of Avistar, said, “After a thorough and competitive review, Zultys selectedAvistar. Zultys is recognized for its innovative, open standards IP communications andtelephony products. Avistar C3™ will help Zultys open new revenue streams and provideimportant new videoconferencing features that will strengthen its positioning in its marketsworldwide.”“Videoconferencing provides the ROI our customers are looking for as part of their unifiedcommunications solutions, especially in a down economy, where travel is well scrutinized,” saidSteve Morrison, Vice President, Product Marketing, Zultys. “Avistar C3 augments our line ofVoIP and web conferencing products, empowering our customers to collaborate and takeaggressive action to remain competitive.”Avistar C3 Media EngineBased on the award-winning Avistar C3 Desktop™ solution, the Avistar C3 Media Engineprovides a business class desktop videoconferencing experience to technology partners whorequire a visual communications experience within their applications. Business-classvideoconferencing is recognized as a valuable communications tool that provides corporationsserious cost savings, improved productivity and ROI. According to a recent WainhouseResearch study, one third of those polled see the use of videoconferencing accelerating giventoday’s economy, as it reduces the need and cost for travel plus improves collaboration anddecision-making. At a fraction of the cost of typical videoconferencing solutions, Avistar C3makes videoconferencing easy and approachable for both advanced and novice businessusers.About ZultysZultys, Inc. is showing what's possible for Open Standards IP communications and telephony.Its Open Standards IP technology is the building block for its award-winning IP PBX systems.Zultys develops products that enable companies and organizations in more than 110 countriesand 19 languages to deploy integrated communications systems. For more information visit:www.zultys.com.Avistar and Zultys2About Avistar Communications CorporationAvistar (Nasdaq: AVSR) is a unified visual communications solutions, providing provenbusiness-class technology. Avistar's desktop videoconferencing installations include more than100,000 committed desktop seats worldwide, bringing together business users anytime andanyplace. Companies such as IBM Corp., Sony Corp., LifeSize Communications, Inc. andPolycom Inc. use Avistar technology to power their unified communications solutions. Avistarworks with leading-edge technology partners and resellers including CityIS, Beyondis, Datamartand Fontel in more than 40 countries. For more information, go to www.avistar.com.###Contact:Angela Smith John CunninghamAvistar Zultys, Inc.+1 650-525-3388 +1 408-328-0450 x116asmith@avistar.com john.cunningham@zultys.comMargaret BonillaBirnbach Communications for Avistar+1 603-548-0693mbonilla@birnbachcom.com