H.323
H.323 is an ITU standard for multimedia communications over best-effort LANs.
Part of larger set of standards (H.32X) for videoconferencing over data networks.
H.323 includes both stand-alone devices and embedded personal computer technology as well as point-to-point and multipoint conferences.
H.323 addresses call control, multimedia management, and bandwidth management as well as interfaces between LANs and other networks.