The scope of this TS is to provide a specification for interworking between the ISDN Application Service Element (ASE) protocol for supplementary services and the Mobile Application Part (MAP) protocol on MAP D-interface protocol for handling of supplementary services within the digital cellular telecommunications system (Phase 2+). This version of the specification includes the interworking for the Call Completion to Busy Subscriber (CCBS) service between the ISDN CCBS-ASE and MAP.
The MAP protocol for CCBS service is specified in TS 09.02
. The ISDN CCBS-ASE protocol is specified in ETS 300 356 18. The ISDN CCBS-ASE protocol is also commonly referred to as the SSAP protocol in TS 03.93
. This TS clarifies the interworking within the HLR between these protocols for the Call Completion to Busy Subscriber (CCBS) service.