H324
The ITU-T recommendation H.324 describes the multimedia communication ofaudio and video data with low bit rates over analogtelephone networks.
In addition, the H.324 recommendation includes further standards for video codecs with low data rates that operate over V.34 with telephone cables, but also over ATM, ISDN and over mobile networks.
The recommendation serves as a system specification for a videophone. Compatibility with H.320, network code translation, multipoint support, and continuous presence are provided. H.324 works with audio codecs according to G.723 and video codecs according to H.263. H.324M advances the inclusion of video technologies in the 3rd generation of mobile devices. The corresponding protocol is called 3G-H.324M.