This Recommendation describes the means by which audio, video, data, and control are associated, coded, and packetized for transport between H.323 equipment on a packet-based network. This includes the use of an H.323 gateway, which inturn may be connected to H.320, H.324, or H.310/H.321 terminals on N-ISDN, GSTN, or B-ISDN respectively. The equipment descriptions and procedures are described in ITU-T Rec. H.323 while this Recommendation covers protocols and message formats. Communication via an H.323 gateway to an H.322 gateway for guaranteed Quality of Service (QoS) LANs and thusto H.322 endpoints is also possible.
ITU-T H.225.0-2009 history
2009ITU-T H.225.0-2009 Call signalling protocols and media stream packetization for packet-based multimedia communication systems (Study Group 16)
2007ITU-T H.225.0 AMD 1-2007 Call signalling protocols and media stream packetization for packet-based multimedia communication systems Amendment 1: Updating connected party information after third party pause and re-routing and procedures related to echo control Study Group 16
2006ITU-T H.225.0-2006 Call signalling protocols and media stream packetization for packet-based multimedia communication systems