23.0723GPPCall Deflection (CD) supplementary serviceRelease 17Stage 2TS
8.1 Line Identification services
If the serving MSC receives an Answer message from the destination C network after the successful invocation of the call deflection supplementary service, the process MAF039 of TS 23.081 shall be performed. Refer to Process ICH_MSC of TS 23.018 for further details.
8.2 Call Forwarding services
8.3 Call Waiting
The MS may send a CD Request message for an incoming waiting call. Refer to procedure Process_Call_Waiting_MSC of TS 23.018 for further details.
8.4 Call Hold
8.5 Multi Party (MPTY)
8.6 Closed User Group
The serving VLR shall perform the forwarding CUG authorisation as defined in TS 23.085 while processing a call deflection request. Refer to Process ICH_VLR of TS 23.018 for details.
8.7 Advice of Charge (AoC)
8.8 Call Barring Services
If a call deflection request is processed, the serving VLR shall check whether the requested deflected-to number contradicts active and operative outgoing barring programs. Refer to Procedure CD_Authorization (figure 6.6) for details.
8.9 Explicit call transfer (ECT)
If in the originating network ECT is invoked (one call answered, the other alerting), the serving MSC shall map a redirection number parameter received in the ECT notification into the calling identity parameter of the outgoing IAM message. Refer to TS 23.091 (Interaction of Call Forwarding on mobile subscriber busy due to UDUB and explicit call transfer) for details.
8.10 Completion of Calls to Busy Subscriber (CCBS)
If a call is deflected to a NDUB destination, the serving MSC shall set the diagnostic to "CCBS not possible" when it releases the call towards the calling network. Refer to Process ICH_MSC of TS 23.018 for further details.
The serving MSC shall remove the CCBS call Indicator from the IAM message when deflecting a call.