scope:

The present document describes the protocol to be used on the Interconnection Border Control Function (IBCF) - Transition Gateway (TrGW) interface and the CS-IBCF - CS-TrGW interface. The basis for this protocol is the H.248 protocol as specified in ITU-T. The Profile provides MG control function for IMS and CS Border Control. The IMS architecture is described in 3GPP TS 23.228 [2]. The underlying reference model and stage 2 information is described in Annex I of 3GPP TS 23.228 [2] and in 3GPP TS 29.162 [18]. The CS architecture is described in Annex A of 3GPP TS 29.235 [17].

This specification describes the application of H.248 Ix profile for both Ix and CS-Ix interfaces. Required extensions use the H.248 standard extension mechanism. In addition certain aspects of the base protocol H.248 are not needed for this interface and thus excluded by this profile.

NOTE: The Ix profile is applied over both IMS and CS Ix interfaces.

In the following text the terms IBCF and TrGW also include respectively the CS-IBCF and CS-TrGW functionalities.