3 Definitions and abbreviations

23.2783GPPCustomised Applications for Mobile network Enhanced Logic (CAMEL) Phase 4IM CN InterworkingRelease 17Stage 2TS

3.1 Definitions

Home Subscriber Server (HSS): Functional entity containing the subscription related information to support the network entities actually handling calls/sessions. For subscribers requiring CAMEL support, the HSS includes some functionality that was present in the HLR in previous 3GPP releases for storing the information relevant to the current subscription regarding CAMEL Subscription Information for IMS. The HSS sends IM CAMEL Subscription Information data to the IM‑SSF and CSE using a MAP interface.

IP Multimedia Service Switching Function (IM‑SSF): CAMEL functional entity that provides the interworking between SIP session control and the CAMEL state models. The IM‑SSF also provides the CAMEL interface to HSS for downloading the subscriber’s CAMEL Subscription Information data for IMS.

IP Multimedia Basic Call State Model (IM‑BCSM): IM‑BCSM provides a high-level model of CSCF activities required to establish and maintain communication paths for users. As such, it identifies a set of basic call activities in a CSCF and shows how these activities are joined together to process a basic call.

IP Multimedia CAMEL Subscription Information (IM‑CSI): IM‑CSI identifies the subscriber as having IP Multimedia CAMEL services.

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

Originating IP Multimedia Basic Call State Model (O‑IM‑BCSM): originating half of the IM‑BCSM. The O‑IM‑BCSM corresponds to that portion of the IM‑BCSM associated with the originating party.

Originating IP Multimedia CAMEL Subscription Information (O‑IM‑CSI): O‑IM‑CSI identifies the subscriber as having originating IP Multimedia CAMEL services.

Terminating IP Multimedia Basic Call State Model (T‑IM‑BCSM): terminating half of the IM‑BCSM. The T‑IM‑BCSM corresponds to that portion of the IM‑BCSM associated with the terminating party.

Terminating IP Multimedia CAMEL Subscription Information (T‑IM‑CSI): T‑IM‑CSI identifies the subscriber as having terminating IP Multimedia CAMEL services.

3.2 Abbreviations

Abbreviations used in the present document are listed in 3GPP TR 21.905 [1].

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

BCSM Basic Call State Model

CAMEL Customized Applications for Mobile network Enhanced Logic

CAP CAMEL Application Part

CSCF Call State Control Function

DP Detection Point

D‑IM‑CSI Dialled Service IP Multimedia CAMEL Subscription Information

EDP Event Detection Point

FTN Forwarded To Number

GPRS General Packet Radio Service

gsmSCF GSM Service Control Function

gsmSRF GSM Specialised Resource Function

gsmSSF GSM Service Switching Function

HPLMN Home PLMN

HSS Home Subscriber Server

IE Information Element

IF Information Flow

IP Internet Protocol

ISC IM‑CN Service Control

I‑CSCF Interrogating CSCF

IM IP Multimedia

IM‑BCSM IP Multimedia Basic Call State Model

IMCN IP Multimedia Core Network

imcnSSF IM CN Service Switching Function

IM‑CSI IP Multimedia CAMEL Subscription Information

IM‑SSF IP Multimedia Service Switching Function

IPLMN Interrogating PLMN

MGCF Media Gateway Control Function

MO Mobile Originating

MT Mobile Terminating

NNI Network Node Interface

O‑IM‑BCSM Originating IP Multimedia Basic Call State Model

O‑IM‑CSI Originating IP Multimedia CAMEL Subscription Information

PIC Point In Call

PLMN Public Land Mobile Network

P‑CSCF Proxy CSCF

SIP Session Initiation Protocol

S‑CSCF Serving CSCF

SSME Service Switching Function Management Entity

T‑IM‑BCSM Terminating IP Multimedia Basic Call State Model

VT‑IM‑CSI Terminating IP Multimedia CAMEL Subscription Information

TDP Trigger Detection Point

UNI User Network Interface

VPLMN Visited PLMN