scope:

[ITU-T H.248.55] provides a generic package (as base package) for pull mode support. Such a capability is, for instance, required for bearer/media path-coupled QoS control protocols, like the resource reservation protocol (RSVP) according to [IETF RFC 2205]

This extension package describes the RSVP-specific procedures and enables the ITU-T H.248 entities to support an RSVP mechanism, which includes the initiation/termination of RSVP messages. This package provides a means of resource reservation, by which the MGC and the MG are able to set up the bearer path with the desired QoS.

[IETF RFC 2205] defines several RSVP message types. In addition to the two fundamental types: (Path and Resv), there are also teardown messages (PathTear and ResvTear), error messages (PathErr and ResvErr) and a confirm message (ResvConf). This Recommendation introduces a generic method for the MGC and the MG to deal with these above messages to support RSVP.

The ITU-T H.248 media gateway acts as an RSVP-aware policy enforcement point (PEP) when processing RSVP messages. The ITU-T H.248 MGC acts as an RSVP-aware policy decision point (PDP), it is the MGC that determines when to send the RSVP messages. On reception of incoming RSVP messages, the MG reports the related events to the MGC for its resource policy decision.

As such, the packages in this Recommendation allow the support of the functionality outlined by the application/RSVP interface (clause 3.11.1 of [IETF RFC 2205]).