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ITU-T Study Group 16 (Study Period 2005-2008) |
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Question 3/16 - Multimedia Gateway Control Architectures and Protocols |
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(Continuation of Question 3/16)
- Motivation
ITU-T Study Group 16 created the H.248.x sub-series, which decomposed the H.323 Gateway function defined in
ITU-T Rec. H.246 into functional subcomponents called Media Gateway Controllers and Media Gateways and specified
the protocols these components use to communicate. This enabled H.323 gateways to be composed of components from
multiple vendors distributed across multiple physical platforms. This work was done in collaboration with the
IETF Megaco Working Group. The H.248 protocol is applicable to many different types of gateways. H.248 can be
used with Media Gateway Controllers terminating a number of call/session control protocols, for example: BICC
(which supports multimedia according to Rec. H.320), ISUP, SIP, H.323 and Q.931. H.248 can be used to control
media gateways terminating: TDM, IP, ATM and AAL2. H.248 has also found application in Mobile 3G networks,
IP-Cablecom networks and to control IP Phones. H.248 is an important element in today's softswitch architectures
and networks.
- Study Items
This Question considers multimedia gateway architecture and the development of multimedia gateway control
protocols for gateways interworking existing networks and new networks as defined by the Next Generation
Network group. Specific study items include the addition of new functionality to the H.248.x sub-series
to enable existing and new network nodes to work as a split Media Gateway Controller and Media Gateway.
Items of study may also include gating functionality such: QoS control and network access control.
Aside from H.300 Series related work, the development of NGN-related H.248.x packages (not core network related)
will be developed in coordination with SG 11. The responsibility for core network related NGN H.248.x packages
lies with SG 11, in coordination with this Question.
- Tasks
Tasks include, but are not limited to:
- H.248.1 V3 (2004/2005).
- New H.248.x sub-series Recommendations for packages for new study items (2004-2007).
- Packages Supplement (2004-2007).
- Maintenance of H.248.x sub-series (2004-2007).
An up-to-date status of work under this Question is contained in the
SG 16 Work Programme.
- Relationships
Recommendations:
- G.799.1
- J.171
- H.221, H.223
- H.323, H.324
- Q.115.0
- Q.1950
Questions:
- ITU-T Q.2/16 on H.323
- ITU-T Q.5/16 on Firewall Traversal and NAT issues
- ITU-T Q.24(F)/16 on QoS Issues
- ITU-T Q.25(G)/16 on Security Issues
- ITU-T Q.15-18/16 on TIGIN Gateways
Study Groups:
- ITU-T SG 9 on Cable Gateways
- ITU-T SG 11 on BICC and Bearer Media Control
- ITU-T SG 13 on the NGN Project
Other Bodies:
- IETF for Internet matters including MEGACO Working Group.
- ETSI 3GPP on gateways (Mc interface) and Media Resource Function.
- ETSI TISPAN on NGN, Access and Residential Gateway, Gatecontrol.
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