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ITU-T H.248.78 (04/2015)

网关控制协议：承载层面应用层面网关

ITU-T H.248.78建议书定义的程序包能够将媒体网关（MG）收到的运营商级应用协议（如实时流传输协议（RTSP）或消息会话中继协议（MSRP））信息传送至媒体网关控制器（MGC）。这能使MGC行使对信息的网络地址转换等应用级网关功能，然后将信息前转至MG，以发送至目的地。
03/2013修订加入了有关正确引用“消息会话中继协议”的更新。
04/2015 修订增加了一个新的ITU-T H.248包，用于支持：
a) 位于MG的应用层网关功能和
b) MG消息回传功能
此外，还将标准从“运营商级应用层网络”更新为“运营商级消息回传和应用层网关”。

Citation:	https://handle.itu.int/11.1002/1000/12453
Series title:	H series: Audiovisual and multimedia systems H.200-H.499: Infrastructure of audiovisual services H.240-H.259: Communication procedures
Approval date:	2015-04-29
Provisional name:	H.248.ALG
Approval process:	AAP
Status:	Superseded
Maintenance responsibility:	ITU-T Study Group 21
Further details:	Patent statement(s) Development history

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
4	H.248.78 (11/2015)	In force	here	here	here
3	H.248.78 (04/2015)	Superseded	here	here	here
2	H.248.78 (03/2013)	Superseded	here	here	here
1	H.248.78 (09/2010)	Superseded	here	here	here


ITU-T Supplement	Title	Status	Summary	Table of contents	Download
H Suppl. 6 (04/2006)	Control load quantum for decomposed gateways	In force	here	here	here
H Suppl. 9 (05/2008)	Gateway control protocol: Operation of H.248 with H.225.0, SIP, and ISUP in support of emergency telecommunications service (ETS)/international emergency preference scheme (IEPS)	In force	here	here	here
H Suppl. 11 (02/2009)	Analysis of class-based home network QoS solutions	In force	here	here	here
H Suppl. 12 (11/2013)	Gateway control protocol: Priority traffic treatment by ITU-T H.248 gateways	In force	here	here	here
H Suppl. 13 (10/2015)	Gateway control protocol: Common ITU-T H.248 terminology - Release 2	In force	here	here	here
H Suppl. 14 (10/2015)	Gateway control protocol: SDP codepoints for gateway control - Release 2	In force	here	here	here
H Suppl. 15 (01/2017)	Conversion and coding practices for HDR/WCG Y'CbCr 4:2:0 video with PQ transfer characteristics	In force	here	here	here
H Suppl. 17 (11/2014)	Guide for addressing accessibility in standards	In force	here	here	here
H Suppl. 18 (10/2017)	Signalling, backward compatibility and display adaptation for HDR/WCG video coding	In force	here	here	here
H Suppl. 19 (04/2021)	Usage of video signal type code points	In force	here	here	here
H Suppl. 21 (01/2025)	Film grain synthesis technology for video applications	In force	here	here	here

Title	Approved on	Download
Implementers' Guide for ITU-T H.248 Sub-series	2017-10-27	here

Title	Approved on	Download
Testing of personal audio systems for compliance with ITU-T H.870 (2018)	2024	here
Testing of personal audio systems for compliance with ITU-T H.870 (2018)	2021	here
Telecommunications Accessibility Checklist	2006	here

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ITU-T H.248.78 (04/2015)