H.324

H.324

Terminal for low bit-rate multimedia communication
Status	In force
Latest version	5.0 April 2009
Organization	ITU-T
Related standards	G.711,G.722,G.723.1,3G-324M
Website	https://www.itu.int/rec/T-REC-H.324

H.324is anITU-Trecommendation forvoice,videoanddatatransmission over regularanalogphonelines. It uses a regular 33,600 bit/smodemfor transmission, theH.263codec for videoencodingandG.723.1for audio.

H.324 standard is formally known asTerminal for low bit-rate multimedia communication.H.324 covers the technical requirements for very low bit-rate multimedia telephone terminals operating over theGeneral Switched Telephone Network(GSTN). H.324 terminals provide real-time video, audio, or data, or any combination, between two multimedia telephone terminals over a GSTN voice band network connection.

H.324 terminals offering audio communication shall support the G.723.1 audio codec. H.324 terminals offering video communication shall support the H.263 andH.261video codecs. G.722.1may be used for wideband audio applications. Annex G of H.324 specification defines usage of ISO/IEC 14496-1 (MPEG-4Systems) generic capabilities in H.324 terminals. H.324/I terminals shall support interoperation with voice telephones usingG.711speech coding, if the connected network supports transmission and reception of G.711. Other modes such asG.722audio may optionally be supported as well.

H.324 was adapted by3GPPto form3G-324M.

It is for example used in theVialta BeamerBM-80 Phone Video Station, the MINX system from Datapoint Corporation, and in several othervideophones.

See also

• H.320
• H.323
• Videoconferencing
• Videotelephony

External links

• ITU-T Recommendation H.324: Terminal for low bit-rate multimedia communication
• 3GPP TS 26.111 - Codec for circuit switched multimedia telephony service; Modifications to H.324