4 General

29.3643GPPIP Multimedia Subsystem (IMS) Application Server (AS) service data descriptions for AS interoperabilityRelease 17TS

MMTEL/IMS CAMEL Services are supported by Application Servers that may store the Service Data attached to each user in the HSS via the Sh Interface. This data is referred to as transparent data and is understood syntactically but not semantically by the HSS.

Different ASs providing MMTEL/IMS CAMEL services for a given user may be required. Therefore several ASs should access, utilise and update the Service Data for the user stored in the HSS. The ASs should interoperate and share the Service Data attached to this user.

To aid the interoperability between ASs, this specification defines:

– the structure and the coding of the Service Data transferred over the Sh interface between the HSS and the ASs for MMTEL/IMS CAMEL services,

– the use of the Sh procedures to ensure the sharing and synchronization of these Service Data between ASs,

– additional transfer mechanism such as base64 encoding.

Two optional formats are defined for the structure and the coding of the MMTEL Service Data:

– A XML format supporting the Service Data for the complete MMTEL Services.

– A binary format supporting the Service Data for the subset of MMTEL Services corresponding to the PSTN/ISDN and CS supplementary services.

An XML format is defined for the structure and the coding of the IMS CAMEL Subscription Data.