Control protocol for multimedia communication |
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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.Products claiming compliance with Version 12 of H.245 shall comply with all of the mandatory requirements of this Recommendation. Version 12 products can be identified by H.245 TerminalCapabilitySet messages containing a protocolIdentifier value of {itu-t (0) recommendation (0) h (8) 245 version (0) 12}.Relative to H.245 Version 11 (2005-01), this version includes:
• An entry for G.722.1 Extension to Table VIII.1.
• Relating to draft new ITU-T Rec. H.235.8, removed the comment "used only by Master" describing the use of EncryptionSync in OpenLogicalChannel, and added the semantics "It may also be used by the slave to provide the encryption key and the synchronization point for a media channel sourced by the slave" to the semantics of EncryptionSync in OpenLogicalChannel.
• Added a new Annex R with the generic capability description for the GSM Adaptive Multi-Rate Narrow Band (AMR-NB) and Adaptive Multi-Rate Wide Band (AMR-WB) codecs.
• Added a new Annex S with generic capability description for the Internet Low Bit Rate Codec (iLBC).
• D.156 with agreement documented in TD-153r1 (WP 2): Optional use of RFC 3984 packetization in H.241. Addition of two new OIDs to Table VIII.1.
• Support of Unicode characters in H.32x systems.
• Clarification of the usage of the "logical" parameter in generic capabilities.
• Addition of GenericInformation to the TCS*, OLC*, end session and user input messages.
• Addition of a genericInformation field to UserInputCapability.
• Changed all references to H.235 Annex G to H.235.7.
• Added a reference to H.235.8.
• Modified the reference to H.235 to H.235.0. |
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Citation: |
https://handle.itu.int/11.1002/1000/8568 |
Series title: |
H series: Audiovisual and multimedia systems H.200-H.499: Infrastructure of audiovisual services H.240-H.259: Communication procedures |
Approval date: |
2005-10-07 |
Approval process: | AAP |
Status: |
Superseded |
Maintenance responsibility: |
ITU-T Study Group 21 |
Further details: |
Patent statement(s)
Development history
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ITU-T Supplement
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Title
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Status
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Summary
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Table of contents
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Download
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H Suppl. 6 (04/2006)
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Control load quantum for decomposed gateways
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In force
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here
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here
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here
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H Suppl. 9 (05/2008)
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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)
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In force
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here
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here
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here
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H Suppl. 11 (02/2009)
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Analysis of class-based home network QoS solutions
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In force
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here
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here
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here
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H Suppl. 12 (11/2013)
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Gateway control protocol: Priority traffic treatment by ITU-T H.248 gateways
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In force
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here
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here
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here
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H Suppl. 13 (10/2015)
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Gateway control protocol: Common ITU-T H.248 terminology - Release 2
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In force
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here
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here
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here
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H Suppl. 14 (10/2015)
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Gateway control protocol: SDP codepoints for gateway control - Release 2
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In force
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here
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here
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here
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H Suppl. 15 (01/2017)
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Conversion and coding practices for HDR/WCG Y'CbCr 4:2:0 video with PQ transfer characteristics
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In force
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here
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here
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here
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H Suppl. 17 (11/2014)
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Guide for addressing accessibility in standards
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In force
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here
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here
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here
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H Suppl. 18 (10/2017)
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Signalling, backward compatibility and display adaptation for HDR/WCG video coding
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In force
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here
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here
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here
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H Suppl. 19 (04/2021)
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Usage of video signal type code points
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In force
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here
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here
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here
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H.245 (2005-10)
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Index of all ASN.1 assignments defined in this Recommendation.
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Click
here
to download all the modules of this Recommendation (zipped archive)
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Click here to download all the modules needed to compile this Recommendation (zipped archive)
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Title |
Approved on |
Download |
Testing of personal audio systems for compliance with ITU-T H.870 (2018)
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2024
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Testing of personal audio systems for compliance with ITU-T H.870 (2018)
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2021
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here
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Telecommunications Accessibility Checklist
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2006
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here
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