H.323 Standard

- and overview or tutorial of the basics of the H.323 protocol or h.323 standard used on IP telecommunications networks.

The H.323 standard provides a foundation for audio, video, and data communications across a variety of IP-based telecommunications networks, including the Internet.

The H.323 standard has become widely used with the growth of IP based networks.

The standard enables a variety of multimedia products and applications from multiple vendors to operate satisfactorily together. They are able to interoperate, allowing users to communicate without concern for compatibility.

H.323 background

H.323 is an umbrella recommendation from the International Telecommunications Union, ITU. It provides the standards for multimedia communications over Local Area Networks, LANs, that do not provide a guaranteed Quality of Service, QoS.

Today most telecommunications networks and local area networks operate using packet switching techniques and the vast majority cannot provide a guaranteed quality of service. Technologies used on these networks include TCP/IP and IPX over Ethernet, Fast Ethernet and Token Ring network technologies.

As a result, the H.323 standards are important have gained wide acceptance across the industry and are widely used.

The H.323 specification was approved in 1996 by the ITU Study Group 16. Version 2 was later approved in January 1998. Broadly the standard includes both stand-alone devices and embedded personal computer technology. It also includes point-to-point and multipoint conferences.

H.323 also addresses call control, multimedia management, and bandwidth management as well as interfaces between LANs and other networks.

H.323 is part of a larger series of communications standards that enable video-conferencing across a range of networks. Known as H.32X, this series includes H.320 and H.324, which address ISDN and PSTN communications, respectively.

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