This subclause describes the functional architecture needed to support Supplementary Service (SS) Notifications. Figure 8.1 shows the functional entities involved in sending SS Notifications. The architecture is applicable to the third phase of CAMEL or higher.

HLR: MSC: VLR: gsmSCF:

This subclause describes the different interfaces applicable to SS Notifications. It specifies on a high level the functions specific to SS Notifications.

This subclause defines the contents of the Supplementary Service Invocation Notification CAMEL Subscription Information (SS-CSI).

The gsmSCF address list indicates a list of gsmSCF addresses to which Notification on Change of Subscriber Data is to be sent. This list is common to all CSI.

At the invocation of any of the services ECT, CD and MPTY the VLR checks whether the criteria for sending a notification are fulfilled, i.e. whether the subscriber is provisioned with the SS-CSI and the particular invoked supplementary service is marked in the SS-CSI. If this is the case a notification is sent to the gsmSCF given by the gsmSCF address contained in the SS-CSI. The processing of the particular SS invocation is not suspended. If the notification criteria are not fulfilled the processing of the particular supplementary service continues unchanged and no notification is sent. The sending of the notification is independent of call related CAMEL processing, i.e. processing indicated by O/D/T/VT-CSI. On invocation of ECT, the VLR shall include the SS-CSI in the Invoke ECT response message (see Process MAF027 in TS 23.091) to the MSC if applicable for ECT. On invocation of MPTY, the VLR shall include the SS-CSI in the Process MPTY message (see Process MPTY_MAF026 in TS 23.084) to the MSC if applicable for MPTY. On invocation of CD, the VLR shall include the SS-CSI in the Send Info For Incoming Call ack information flow to the MSC if applicable to CD (see TS 23.072). When a subscriber activates a CCBS request, the HLR checks whether the criteria for sending a notification are fulfilled, i.e. whether

• The subscriber is provisioned with an active SS-CSI, and
• CCBS is marked in the SS-CSI.

If the criteria are fulfilled, a notification is immediately sent to the gsmSCF given by the gsmSCF address contained in the SS-CSI and the processing of the CCBS request continues. Whenever the state of the CCBS request changes (see TS 23.093), an additional notification is immediately sent to the gsmSCF and the processing of the CCBS request continues. If the criteria are not fulfilled, the processing of the CCBS request continues unchanged and no notifications are sent. At the invocation of the CCBS supplementary service, the HLR checks whether the criteria for sending a notification are fulfilled, i.e. whether the subscriber is provisioned with the SS-CSI and the particular invoked supplementary service is marked in the SS-CSI. If this is the case, a notification is sent to the gsmSCF given by the gsmSCF address contained in the SS-CSI. The processing of the SS invocation is not suspended. If the notification criteria are not fulfilled the processing of the particular supplementary service continues unchanged and no notification are sent.