Summary

Recommendation ITU-T H.225.0 covers the technical requirements for narrow-band visual telephone services defined in H.200 and F.720-series Recommendations, in those situations where the transmission path includes one or more packet-based networks, each of which is configured and managed to provide a non-guaranteed Quality of Service (QoS) which is not equivalent to that of N‑ISDN, such that additional protection or recovery mechanisms beyond those mandated by Rec. ITU‑T H.320 need be provided in the terminals. It is noted that Rec. ITU-T H.322 addresses the use of some other LANs which are able to provide the underlying performance not assumed by ITU‑T Recs H.323 and H.225.0.

This Recommendation describes how audio, video, data, and control information on a packet-based network can be managed to provide conversational services in H.323 equipment.

Products claiming compliance with Version 8 of H.225.0 (this version) shall comply with all of the mandatory requirements of this Recommendation. Version 8 products can be identified by H.225.0 messages containing a protocolIdentifier value of {itu-t (0) recommendation (0) h (8) 2250 version (0) 8}.

This revision incorporates the following changes:

1)          Enhancements for language capability exchange.

2)          Modification to the scope regarding use on the Internet.

3)          Clarification that the Facility message may be used to initiate call transfer.