6 SIWF and Supplementary Services

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

Supplementary Services shall not be affected by the concept of the SIWF. The Supplementary Services applicable for data services are defined in GSM 02.04.

NOTE: Supplementary Services may depend on the signalling system between visited MSC, fixed network and SIWFS. This dependence is described in other specifications and it is outside the scope of the present document.

6.1 Number Identification Supplementary Services

The parameters related to the number identification Supplementary Services are passed transparently through SIWFS as received in the signalling from visited MSC or fixed network. This is applicable for CLIP, CLIR, COLP and COLR.

6.2 Call Offering Supplementary Services

In the case the call is a normal MTC and the B-subscriber does not answer, the call may be Call Forwarded on No Reply (CFNRy). This situation requires that the allocated resources are released, when the call is forwarded.

CFU, CFB and CFNRc have no impact.

6.3 Call Waiting (CW)

No impact.

6.4 Closed User Group (CUG)

The parameters related to Closed User Group (CUG) are passed transparently through SIWFS as received in the signalling from visited MSC or fixed network.

6.5 User-to-User Supplementary Services

The parameters related to User-to-User signalling are passed transparently through SIWFS as received in the signalling from visited MSC or fixed network.

6.6 Charging Supplementary Services

No impact. This is applicable for AoCI and AoCC.

6.7 Call Restrictions

No impact. This is applicable for the barring services e. g. BAOC, BOIC, BOIC-exHC, BAIC and BAIC-Roam.

6.8 Support of Private Numbering Plan (SPNP)

No impact.

6.9 Call Completion on Busy Subscriber (CCBS)

The parameters related to CCBS are passed transparently through SIWFS as received in the signalling from visited MSC or fixed networks.