Most importantly, this T.120 support means that data handling can occur either in conjunction with H.323 audio and video, or separately. Microsoft and more than 120 other leading companies have announced their intent to support and implement H.323 in their products and services. This broad support establishes H.323 as the standard for audio and video conferencing over the Internet. H.323 conferencing clients, bridges, servers, and gateways support this interoperability. H.323 provides multiple audio and video codecs that format data according to the requirements of various networks, using different bit rates, delays, and quality options.
Users can choose the codecs that best support their computer and network selections.
The addition of T.120 data conferencing support to the H.323 specification means that products developed under H.323 can offer a full range of multimedia functions, with both data and audiovisual conferencing support. Testing identifies whether third-party products interoperate based on the H.323 specifications for the H.245 and Q.931 protocols. Verifying that a third-party product can accept a NetMeeting call using the same default codecs, or that NetMeeting can negotiate a suitable set of codecs. Determining whether the products can open channels and pass data after the call is established. Verifying that all control sequencing runs correctly.