ViDeNet: IP Network for Global Voice and Videoconferencing
A Case Study by Radvision; August 2001
Working together, ViDeNet and RADVision have developed a global
video-conferencing network that serves as a model for voice and
video communications. Due in large part to this cooperation, ViDeNet
has emerged as one of the global leaders in network communications
research and deployment, bringing together over 70 universities
and research organizations in the world's largest H.323 network.
RADVision has benefited from the partnership as well, gaining the
opportunity to test its gatekeeper technology in a real-world environment
rather than the usual controlled, laboratory setting.
(H.323 is the name given to a set of communications protocol,
used by programs such as Microsoft NetMeeting to transmit audio
and video information over the Internet. It was developed by the
an international standards body for telecommunications. For more
comprehensive information, try the links at
ViDeNet, an outgrowth of the ViDe consortium's goals of highly
scalable and robust video networks, is based on zones, or administrative
domains.These zones consist of local area networks and single end-user
devices that sit on an H.323 network; these components are then
logically defined to become part of the ViDeNet network.
(The gatekeeper is the brain of the H.323 network. It provides
the following functions: authentication, authorization, network
usage control, system administration and security policy, call control
and routing, basic telephony services, and control of bandwidth
usage to provide and maintain quality of service. For more comprehensive
information, see RADVision's explanation of H.323 gatekeepers.)
By having the chance to field test the gatekeeper technology, RADVision
has been able to more accurately develop products like Gateways
and Multi-Point Conferencing Units. Rather than building designs
tested under carefully monitored and predictable environments, RADVision
has had the opportunity to watch its products at work, making changes
and improvements based on an actual working network. This has also
led to greater feedback for the standards communities from the company.
The case study RADVISION
Technology at the Core of the Largest IP Network for Global Voice
and Videoconferencing: ViDeNet provides more information about
the history of the ViDeNet / RADVision partnership, as well as an
introduction to the technology behind the network.