A videoconferencing standard developed by the International Telecommunication Union (ITU) that defines videoconferencing from the desktop over LANs, intranets, and the Internet.
H.323 specifies techniques for compressing and transmitting real-time voice, video, and data between a pair of videoconferencing workstations. It also describes signaling protocols for managing audio and video streams, as well as procedures for breaking data into packets and synchronizing transmissions across communications channels.
See also Real-time Transport Protocol; T.120.