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ITU-T H.323

Packet-based multimedia communications systems

active, Most Current
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Organization: ITU-T
Publication Date: 1 December 2009
Status: active
Page Count: 320
scope:

This Recommendation covers the technical requirements for multimedia communications systems in those situations where the underlying transport is a Packet-Based Network (PBN) which may not provide a guaranteed Quality of Service (QoS). These packet-based networks may include Local Area Networks, Enterprise Area Networks, Metropolitan Area Networks, Intra-Networks and Inter-Networks (including the Internet). They also include dial up connections or point-to-point connections over the GSTN or ISDN which use an underlying packet-based transport such as PPP. These networks may consist of a single network segment, or they may have complex topologies which incorporate many network segments interconnected by other communications links.

This Recommendation describes the components of an H.323 system. This includes Terminals, Gateways, Gatekeepers, Multipoint Controllers, Multipoint Processors and Multipoint Control Units. Control messages and procedures within this Recommendation define how these components communicate. Detailed descriptions of these components are contained in clause 6.

H.323 terminals provide audio and optionally video and data communications capability in point-to-point or multipoint conferences. Interworking with other H-series terminals, GSTN or ISDN voice terminals, or GSTN or ISDN data terminals is accomplished using Gateways. See Figure 1. Gatekeepers provide admission control and address translation services. Multipoint Controllers, Multipoint Processors and Multipoint Control Units provide support for multipoint conferences.

The scope of H.323 does not include the network interface, the physical network or the transport protocol used on the network. Examples of these networks include but are not limited to:

- Ethernet (IEEE 802.3);

- Fast Ethernet (IEEE 802.3u);

- FDDI;

- Token Ring (IEEE 802.5);

- ATM.

Document History

March 1, 2013
Packet-based multimedia communications systems Amendment 1: Use of Facility message to enable call transfer
A description is not available for this item.
ITU-T H.323
December 1, 2009
Packet-based multimedia communications systems
This Recommendation covers the technical requirements for multimedia communications systems in those situations where the underlying transport is a Packet-Based Network (PBN) which may not provide a...
June 1, 2006
Packet-based multimedia communications systems
This Recommendation covers the technical requirements for multimedia communications systems in those situations where the underlying transport is a Packet-Based Network (PBN) which may not provide a...
January 1, 2005
Packet-based multimedia communications systems Amendment 2: New Annex M4 – Tunnelling of narrowband signalling syntax (NSS) for H.323
A description is not available for this item.
January 1, 2005
Packet-based multimedia communications systems Amendment 1: Revised Annex D – Real-time facsimile over H.323 systems: Transport of facsimile signals using RTP
A description is not available for this item.
July 1, 2003
Packet-based multimedia communications systems SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Infrastructure of audiovisual services – Systems and terminal equipment for audiovisual services
A description is not available for this item.
January 1, 2003
Packet-based multimedia communications systems SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Infrastructure of audiovisual services – Systems and terminal equipment for audiovisual services Annex P: Transfer of modem signals over H.323
A description is not available for this item.
July 1, 2001
Packet Based Multimedia Communications Systems Annex M3: Tunneling of DSS1 Through H.323 Series H: Audiovisual and Multimedia Systems Infrastructure of Audiovisual Services - Systems and Terminal Equipment for Audiovisual Services
A description is not available for this item.
July 1, 2001
Packet-Based Multimedia Communications Systems Annex R: Robustness Methods for H.323 Entities Series H: Audiovisual and Multimedia Systems Infrastructure of Audiovisual Services - Systems and Terminal Equipment for Audiovisual Services
A description is not available for this item.
July 1, 2001
Packet-Based Multimedia Communications Systems Annex Q: Far-End Camera Control and H.281/H.224 Series H: Audiovisual and Multimedia Systems Infrastructure of Audiovisual Services - Systems and Terminal Equipment for Audiovisual Services
A description is not available for this item.
November 1, 2000
Packet-Based Multimedia Communications Systems Series H: Audiovisual and Multimedia Systems - Infrastructure of Audiovisual Services - Systems and Terminal Equipment for Audiovisual Services
A description is not available for this item.
February 1, 2000
Packet-Based Multimedia Communications Systems Annex G: Text Conversation and Text SET - Series H: Audiovisual and Multimedia Systems Infrastructure of Audiovisual Services - Systems and Terminal Equipment for Audiovisual Services
A description is not available for this item.
September 1, 1999
Packet-Based Multimedia Communications Systems - Series H: Audiovisual and Multimedia Systems - Infrastructure of Audiovisual Services - Systems and Terminal Equipment for Audiovisual Services
A description is not available for this item.
May 1, 1999
Packet Based Multimedia Communications Systems - Annex F: Simple Endpoint Types - Series H: Audiovisual and Multimedia Systems - Infrastructure of Audiovisual Services - Systems and Terminal Equipment for Audiovisual Services
A description is not available for this item.
May 1, 1999
Packet-Based Multimedia Communications Systems - Annex E: Framework and Wire-Protocol for Multiplexed Call Signalling Transport - Series H: Audiovisual and Multimedia Systems - Infrastructure of Audiovisual Services - Systems and Terminal Equipment for Audiovisual Services
A description is not available for this item.
September 1, 1998
Packet-Based Multimedia Communications Systems - Annex D: Real-time Facsimile Over H.323 Systems - Series H: Audiovisual and Multimedia Systems - Infrastructure of Audiovisual Services - Systems and Terminal Equipment for Audiovisual Services
A description is not available for this item.
November 1, 1996
Visual Telephone Systems and Equipment for Local Area Networks Which Provide a Non-Guaranteed Quality of Service - Series H: Audiovisual and Multimedia Systems Infrastructure of Audiovisual Services - Systems and Terminal Equipment for Audiovisual Services
A description is not available for this item.

References

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