RADVISION introduced a new H.323 Protocol Toolkit for use in developing products supporting both IPv4 and IPv6 protocols. H.323 uses H.245 as the call control protocol. This functionality, which is similar to the use of SDP in SIP-based communication, enables communicating devices to establish multimedia channels based on common capabilities. What differentiates H.245 from SDP is its support of multi-party session operation for voice, video, and data collaboration between multiple end points. These include support of a high ranked terminal (called Chair Control) that can control others and also the sharing of voice, video, and data channels between multiple parties during a conference.
The new RADVISION H.323 Protocol Toolkit v4.2 features version 10 of the H.245, which was ratified on July 2003. The new version adds support for the useful dual-video feature, enabling endpoints to switch dynamically during a session between camera and another resource such as Power Point presentation or a video clip. It also adds protection against Denial of Service (DOS) attacks.
http://www.radvision.com
