TIA TIA-873.005

All-IP Core Network Multimedia Domain – IP Multimedia Subsystem Cx Interface Signaling Flows and Message Contents

Telecommunications Industry Association , 12/01/2003

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This Specification specifies the interactions between the HSS (Home Subscriber Server) and the CSCF (Call Session Control Functions), referred to as the Cx interface.

This document addresses the signalling flows for the Cx interface.

The IP Multimedia (IM) Subsystem stage 2 is specified in [1] and the protocol for the IP multimedia call control based on SIP and SDP are specified in [8].