4 Introduction

29.2783GPPCAMEL Application Part (CAP) specification for IP Multimedia Subsystems (IMS)Customized Applications for Mobile network Enhanced Logic (CAMEL) Phase 4Release 17TS

The CAP stage 3 specification for IMS re-uses the ASN.1 definitions of CAP version 3 as specified in 3GPP Rel-99 TS 29.078 with modifications for CAMEL/IMS interworking. A new Application Context has been created for IMS for Release 5.

For general specifications including lower layer services (i.e. TC and SCCP procedures) , refer to specifications found in 3GPP TS 29.078 [11].

For IMS, the MRFC plays the role of a gsmSRF. The CAP operations sent between the gsmSCF and the MRFC are sent via the IM-SSF. The IM-SSF shall map the CAP operations intended for the MRFC into a SIP based protocol and sent to the MRFC via the S-CSCF. Standardization of the MRFC interface via S-CSCF is outside the scope of this specification.