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ITU-T H.245 (01/2005)

Control protocol for multimedia communication

This Recommendation specifies syntax and semantics of terminal information messages as well as procedures to use them for in-band negotiation at the start of or during communication. The messages cover receiving and transmitting capabilities as well as mode preference from the receiving end, logical channel signalling, and Control & Indication. Acknowledged signalling procedures are specified to ensure reliable audiovisual and data communication.Relative to Version 10 (2003-07) of H.245, this version includes:
• support for RFC 3389 - RTP Payload for Comfort Noise;
• support for bit rates in multiple payload stream;
• L16 Capability Definition;
• resolution of H.245 Open Logical Channel Conflicts;
• definition of a minimum audio packet rate;
• ITU-T Rec. H.235 Annex G "Usage of the MIKEY key management protocol for the secure real time transport protocol (SRTP) within H.235";
• compact H.245 Capabilities Expressions;
• generic capability for Nx64K Circuit Relay over IP;
• update of Resolution of H.245 Open Logical Channel Conflicts;
• call reset procedure in ITU-T Rec. H.324.Products claiming compliance with Version 11 of H.245 shall comply with all of the mandatory requirements of this Recommendation. Version 11 products can be identified by H.245 TerminalCapabilitySet messages containing a protocolIdentifier value of {itu-t (0) recommendation (0) h (8) 245 version (0) 11}.

Citation:	https://handle.itu.int/11.1002/1000/7442
Series title:	H series: Audiovisual and multimedia systems H.200-H.499: Infrastructure of audiovisual services H.240-H.259: Communication procedures
Approval date:	2005-01-08
Approval process:	AAP
Status:	Superseded
Maintenance responsibility:	ITU-T Study Group 16
Further details:	Patent statement(s) Development history [3 related work items in progress]

Ed.	ITU-T Recommendation	Status	Summary	Table of Contents	Download
17.1	H.245 v17 (2022) Cor. 1 (12/2022)	In force	here	here	here
17	H.245 v17 (03/2022)	In force	here	here	here
16	H.245 v16 (05/2011)	Superseded	here	here	here
15	H.245 v15 (12/2009)	Superseded	here	here	here
14	H.245 (06/2008)	Superseded	here	here	here
13	H.245 (05/2006)	Superseded	here	here	here
13.0	H.245 (2006) Err. 1 (10/2006)	Superseded	-	-	here
13.0	H.245 (2006) Err. 2 (11/2007)	Superseded	-	-	here
12	H.245 (10/2005)	Superseded	here	here	here
11	H.245 (01/2005)	Superseded	here	here	here
10	H.245 (07/2003)	Superseded	here	here	here
9	H.245 (02/2003)	Superseded	here	-	here
8	H.245 (07/2001)	Superseded	here	here	here
7	H.245 (11/2000)	Superseded	here	here	here
6	H.245 (02/2000)	Superseded	here	here	here
5	H.245 (05/1999)	Superseded	here	here	here
4	H.245 (09/1998)	Superseded	-	-	here
3	H.245 (02/1998)	Superseded	-	-	here
2	H.245 (07/1997)	Superseded	-	here	here
1	H.245 (03/1996)	Superseded	-	-	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.245 (2005-01)

Index of all ASN.1 assignments defined in this Recommendation.

Click here to download all the modules of this Recommendation (zipped archive)

Click here to download all the modules needed to compile this Recommendation (zipped archive)

Language	Title	OID	Obs.	Last update
ASN.1	MULTIMEDIA-SYSTEM-CONTROL	-

Title	Approved on	Download
Testing of personal audio systems for compliance with ITU-T H.870 (2018)	2024
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 Recommendations

ITU-T H.245 (01/2005)