RADVISION's Click to Meet for Microsoft Live Meeting Enhances Hosted Web Conferencing; End Users To Enjoy Added Real Time Multiparty Video & Audio Functionality

Business Wire, March 6, 2006

FAIR LAWN, N.J. -- RADVISION (Nasdaq: RVSN), a leading provider of multimedia conferencing and communications platforms, today announced that its enterprise collaboration software--Click to Meet(TM) for Microsoft Office Live Meeting, will be deployed by Allstream, the Enterprise Solutions division of Manitoba Telecom Services Inc. and a leading Canadian communication solutions provider. The deployment will provide Allstream's customers with enhanced multiparty audio and video capabilities, as part of its hosted Allstream Collaboration Suite solution.

Click to Meet for Microsoft Office is a scalable communications system that adds integrated multi-participant PC-based video and audio functionality to Live Meeting and Microsoft Office Live Communications Server 2005. The pairing of Click to Meet with Live Meeting provides subscribers a richer audio, visual and data collaboration experience.

"We are continuously looking at ways to enhance our Allstream Collaboration Suite (ACS) solution," said Angela Hlavka, Vice President, Strategic Solution Development for Professional Services, Allstream. "RADVISION's Click to Meet solution is an important enhancement in terms of providing our ACS customers greater functionality, quality and reliability - all in a hosted or non-hosted environment. In addition, we can now offer greater ease-of-use for multi-party audio and video conferencing needs with just one click on your desktop, seamless integration with Microsoft's collaboration and communications applications, and increased scalability that allows customers to access up to 90 simultaneous videofeeds with unlimited participants."

"This enhancement is an example of our focus on key growth service segments, such as unified communications, to deliver innovative and differentiated IP-based solutions in the marketplace," said Hlavka.

"Click to Meet for Microsoft Office seamlessly integrates advanced visual conferencing functionality with Live Meeting, creating a much richer experience for conference participants," said Bob Romano, Vice President of Enterprise Marketing for RADVISION's Networking Business Unit, "This solution is perfectly suited for use in large scale deployments, because of its scalability, ease of use, and low cost of ownership."

"Allstream's creative use of Microsoft's unified communications platform and RADVISION's Click to Meet solution provides great value and flexibility for our joint customers, who might otherwise not be able to collaborate face to face," said Marc Sanders, Senior Product Manager in the Unified Communications Group at Microsoft.

Click to Meet for Microsoft Office's flexibility and scalability allows service providers to offer customers a variety of models: hosted service, managed service, customer premise service, or a monthly fee for service.

About Allstream

Allstream is a leading communication solutions provider with a world-class portfolio of Connectivity, Managed Services and Professional Services. Focused on the business market, Allstream collaborates with customers to create tailored solutions that meet their unique needs and help them compete more effectively. Allstream is a division of Manitoba Telecom Services Inc. (MTS), with a team of dedicated employees focused on delivering outstanding value to its customers. MTS has an extensive broadband fibre-optic network spanning more than 24,300 kilometres, and provides international connections through strategic partnerships and interconnection agreements with other international service providers. MTS's shares are listed on the Toronto Stock Exchange (trading symbol: MBT). For more information, please visit: www.mts.ca and www.allstream.com.

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.

This press release contains forward-looking statements that are subject to risks and uncertainties. Factors that could cause actual results to differ materially from these forward-looking statements include, but are not limited to, general business conditions in the industry, changes in demand for products, the timing and amount or cancellation of orders and other risks detailed from time to time in RADVISION's filings with the Securities Exchange Commission, including RADVISION's Form 20-F Annual Report. These documents contain and identify other important factors that could cause actual results to differ materially from those contained in our projections or forward-looking statements. Stockholders and other readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date on which they are made. We undertake no obligation to update publicly or revise any forward-looking statement.