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ITU-T Study Group 16 (Study Period 2005-2008) |
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Question 2/16 - Real-Time Audio, Video, and Data Communication over Packet-Switched Networks |
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(Continuation of Questions D/16 and 2/16, and part of Question 3/16)
- Motivation
ITU-T Recommendation H.323 is the most widely used communication protocol supporting audio, video, and data
collaboration over packet-based networks. Its utility includes the Internet, private global networks, corporate
LANs, and corporate WANs. While it may operate over a variety of transports, H.323 is almost exclusively used
only on IP networks. This has not limited the use of H.323. In fact, H.323 is successfully used for communication
between users over wired and wireless links, including satellite and microwave links.
This work is ongoing and is currently focused on robustness, interworking with SS7 and other networks, communication
over error prone connections (e.g., wireless), integration with other IP-based communication systems (including presence,
instant messaging, etc.), quality of service, and NAT and firewall traversal. There is a continued focus on maturing
the protocol, adding functional capability where vendors and service providers identify a need for specific enhancements
to the base protocol or extension thereto.
- Study Items
This Question will cover ongoing work in H.323, H.225.0, H.450.x, H.332, H.460.x, H.341, H.245 and H.246. Other items to be covered include the following, but are not limited to:
- An important objective of the Question during this study period is to try to align the work with the stated and ongoing work within the NGN Project. H.323 is viewed as an important component of the services architecture defined therein. Some changes or additions to H.323 may be necessary to meet that objective and to make H.323 an "NGN-aware" multimedia system platform. This study will also cover new ways of integrating audio, video and data in a much more flexible way;
- Work on accessibility issues got underway during the last study period. Accessibility will remain a focus for H.323 during this study period;
- Consideration of the use of H.323 within the context of broadcast systems;
- During the last study period, we completed work on Annex R of H.323, which provides a good basis for robustness within H.323 networks. We expect to have a continued focus on robustness issues;
- As part of the work related to NGN, it may be necessary to extend H.323 or even to adopt a new kind of terminal that meets the specific requirements of the NGN Project. During the previous study period, a concept was considered wherein new terminals might exist. The concept would allow a certain amount of intelligence to exist on the end-user device, but migrate all of the service functionality to the service provider core. This allows the service provider to introduce new services without the complexity of migrating or updating equipment at the customer premises.
- Standardizing the means for interworking between H.323 systems and other systems, including the legacy telephone network, through additions to Recommendation H.246 and other Recommendations as necessary. A particular focus will be H.323 – SIP interworking.
- Tasks
Tasks include, but are not limited to:
- Produce amendments to and/or new revisions of H.323, H.225.0, H.245, H.246, H.341, H.450-series, and H.460-series (2004-2007).
- Produce additional extensions to the H.323 protocol through the addition of H.450-series and H.460-series recommendations (2004-2007).
- Enhance H.323 systems to align it with the NGN Project (2004+).
- Complete work on Annex N (QoS) (2005).
- Define the requirements (2005) and the procedures (2006) for interworking between H.323 and SIP
An up-to-date status of work under this Question is contained in the
SG 16 Work Programme.
- Relationships
Recommendations:
- Q.931, G.700-series audio codecs, H.260-series video codecs, X.680
Questions:
- 23(E), 24(F), 25(G), 26(H), 29(K), 1, 3, 4, 5, 6, 9, 11, 14/16
Study Groups:
Other bodies:
- IETF, ATM Forum, IMTC, ETSI TISPAN, TIA;
- ISO/IEC JTC1/SC29/WG11.
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