6 Functions of the serving MSC

23.0723GPPCall Deflection (CD) supplementary serviceRelease 17Stage 2TS

The functions of the serving MSC are specified in TS 23.018. The procedures specific to the CD supplementary service are specified in this clause.

6.1 Procedure Handling_CD_MSC

This procedure is called when a CD request is received from the MS.

6.2 Procedure CD_Reject

This procedure is called if the CD request was treated unsuccessful in the VLR.

6.3 Procedure CD_Failure

This procedure is called if the CD request was treated unsuccessful in the serving MSC.

6.4 Procedure CD_UUS_Interaction

This procedure is called if the CD request was treated unsuccessful in the serving MSC due to the interaction with the UUS supplementary service.

6.5 Procedure CD_Success

This procedure is called if the CD request was treated successful in the serving MSC.

6.6 Procedure CD_Notify_SS_Invocation

This procedure is called by the procedures CD_OR_Clear and CD_Success to send notification of the CD invocation to the gsmSCF if required.

The output signal SS Invocation Notify is sent if the SS-CSI was received in the SIFIC ack. The SS-CSI will only be included in the SIFIC ack if there is a requirement to notify the gsmSCF that CD has been invoked.

Figure 6.1: Procedure Handling_CD_MSC

Figure 6.2: Procedure CD_Reject

Figure 6.3: Procedure CD_Failure

Figure 6.4: Procedure CD_UUS_Interaction

Figure 6.5: Procedure CD_Success

Figure 6.6 Procedure CD_Notify_SS_Invocation