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H.323

H.323 is an umbrella recommendation from the ITU-T, that defines the protocols to provide audiovisual communication sessions on any packet networks. It is currently implemented by various Internet real time applications as NetMeeting, Voxilla (for Linux). It is a part of the H.32X series of protocols which also address communications over ISDN and PSTN. A challenger to H.323 is SIP a standard from IETF. Both protocols are used in InternetTelephony or IPTelephony[?]

H.323 references many other ITU-T protocols like;

  • H.323 to describe the system, the call model and call signaling procedures.
  • H.225[?] protocol is used to describe the media (audio and video), the stream packetization, media stream synchronization and control message formats.
  • the H.245[?] describes the messages and procedures used for opening and closing logical channels for audio, video and data, capability exchange, control and indications.



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