3 Definitions, symbols and abbreviations

29.3283GPPIP Multimedia (IM) Subsystem Sh interfaceRelease 18Signalling flows and message contentsTS

3.1 Definitions

For the purposes of the present document, the following terms and definitions apply.

IP Multimedia session: IP Multimedia session and IP Multimedia call are treated as equivalent in this specification.

Transparent data: Data that is understood syntactically but not semantically by the HSS. It is data that an AS may store in the HSS to support its service logic. One example is data that an AS stores in the HSS, using it as a repository.

Non-transparent data: Data that is understood both syntactically and semantically by the HSS.

AS (Application Server): a term used to denote either of a SIP Application Server or an OSA Service Capability Server.

3.2 Abbreviations

For the purposes of the present document, the following abbreviations apply:

AS Application Server

C Conditional

CSCF Call Session Control Function

CSG Closed Subscriber Group

DRMP Diameter Routing Message Priority

DSCP Differentiated Services Code Point

GIBA GPRS-IMS-Bundled-Authentication

HSS Home Subscriber Server

IE Information Element

IP Internet Protocol

IM IP Multimedia

IMS IP Multimedia Subsystem

M Mandatory

O Optional

SIP Session Initiation Protocol

SLF Subscription Locator Function

S-CSCF Serving CSCF