[ITU-T H.248.55] provides a generic package(as basepackage) for pull mode support. Such a capability is, for instance, required for bearer/mediapath-coupled QoS control protocols, like the resource reservation protocol (RSVP) according to [IETF RFC 2205].
ITU-T H.248.65-2009 Referenced Document
ITU-T H.248.1-2005 Gateway Control Protocol: Version 3 Study Group 16 Audiovisual Services Systems and Multimedia System Infrastructure - Communications Procedures Study Group 16
ITU-T H.248.55-2008 Gateway control protocol: Generic pull mode package Study Group 16
ITU-T H.248.65-2009 history
2009ITU-T H.248.65-2009 Gateway control protocol: Support of the resource reservation protocol Study Group 16