TIA TIA-873.004

The present document defines a call control protocol for use inthe IP Multimedia (IM) Core Network (CN) subsystem based on theSession Initiation Protocol (SIP), and the associated SessionDescription Protocol (SDP).

The present document is applicable to:

– the interface between the User Equipment (UE) and the CallSession Control Function (CSCF);

– the interface between the CSCF and any other CSCF;

– the interface between the CSCF and an Application Server(AS);

– the interface between the CSCF and the Media Gateway ControlFunction (MGCF);

– the interface between the S-CSCF and the Media ResourceFunction Controller (MRFC)

– the interface between the CSCF and the Breakout GatewayControl Function (BGCF);

– the interface between the BGCF and the MGCF; – the interfacebetween the BGCF and any other BGCF; and

– the interface between the CSCF and an external Multimedia IPnetwork.

Where possible the present document specifies the requirementsfor this protocol by reference to specifications produced by theIETF within the scope of SIP and SDP. Where this is not possible,extensions to SIP and SDP are defined within the present document.The document has therefore been structured in order to allow bothforms of specification.

NOTE 1: This document assumes the existence of the Go interfacebetween the ICN Bearer Control Point and the P-CSCF. However, sincethe Go interface is not supported in the MMD Revision 0, theprocedures that are dependent on the Go interface are notmandatory. This also pertains to the Service Based Local Policy(SBLP) which is also not supported in the MMD Revision 0.

NOTE 2: The present document covers only the usage of SIP andSDP to communicate with the entities of the IM CN subsystem. It isperfectly possible, and not precluded, to use only the capabilitiesof the IP Connectivity Network to allow a terminal containing a SIPUA to communicate with SIP servers outside the IM CN subsystem, andtherefore utilise the services provided by those SIP servers. Suchusage is outside the scope of the present document.

Edition:

03

Published:

12/01/2003

Number of Pages:

266

File Size:

1 file , 1.4 MB