The IM CN subsystem interworks with the external IP networks through the Mb
This document details the interworking between the IM CN subsystem and external IP networks for IM service support.
It addresses the issues of control plane interworking and, user plane interworking for specific interworking use cases.
describes the IMS-Ix
interface requirements in the form of Use Cases which require H.248 protocol
procedures. Subclause 10.4
then details the additional Information Elements required to perform the specific