ITU-T Recommendations

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 14 of H.245 shall comply with all of the mandatory requirements of this Recommendation. Version 14 products can be identified by H.245 TerminalCapabilitySet messages containing a protocolIdentifier value of {itu-t (0) recommendation (0) h (8) 245 version (0) 14}.Relative to H.245 Version 13 (2006-05), this version includes:
• as in Erratum 1 (10/2006), in Table VIII.1, correct GenericH235securityCapability capability identifiers by adding a missing space;
• as in Erratum 2 (11/2007), correct Figure X.3 by changing terminal A label from master to slave and terminal B label from slave to master;
• as in the H.323 System Implementors' Guide, assigned correct (unique) Object Identifiers to 'ITU-R BS.1196' and 'RFC3389 comfort-noise' capabilities;
• added entry to Table VIII.1 to indicate the generic capability defined in H.241 for "Set Submode Capability" as described in C-339;
• added element mcuNumber to the ASN.1 syntax for TerminalYouAreSeeingInSubPictureNumber as described in C-399;
• added ASN.1 changes as described in C-319 and C-321; and
• added OIDs related to H.324 from TD 478/WP2 (07/2007).