3 Definitions and Abbreviations

03.543GPPDescription for the use of a Shared Inter Working Function (SIWF) in a GSM PLMNStage 2TS

3.1 Definitions

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

Visited MSC: The MSC which is responsible for handling calls involving the mobile. In the description of inter-MSC handover in GSM 03.09 this is the MSC referred to as "MSC-A" (controlling MSC).

K Interface: The interface between the visited MSC and an SIWFS.

3.2 Abbreviations

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

CD Call Direction.

CDo Call Direction at Call Set-up.

CDm Call Direction modify.

DRM Data call Routeing Mechanism

IWF Inter Working Function

IWU Inter Working Unit.

MSC/SIWFS An MSC with an implemented SIWF Server.

SIWF Shared Interworking Function.

SIWFC Shared Inter Working Function Controller. Additional functionality in the visited MSC for the support of SIWFS.

SIWFS SIWF Server. SIWFS is the entity where the used IWU is located.

Other abbreviations used in the present document are listed in GSM 01.04.