9.1 Originating network processes

23.0873GPPRelease 17Stage 2TSUser-to-User Signalling (UUS) supplementary service

9.1.1 Procedures in MSC

Figure 9.1.1.1 Procedure UUS_OCH_Check_Setup

This procedure is called when Setup is received from A-subscriber. It sets requested UUS service options into SIFOC message.

Figure 9.1.1.2 Procedure UUS_OCH_Set_Info_In_IAM

Requested UUS service options and possible UUS1 data is copied in IAM. The procedure is controlled by the Complete Call message parameters from the VLR.

Figure 9.1.1.3 Procedure UUS_OCH_Set_Alert_And_Connect_Param

In this procedure UUS related parameters are checked and set into the Alerting/Connect message that is sent to A‑subscriber. If any of the UUS services is requested as required and positive service acknowledgement is not received from the remote end, the check will fail and the call will be cleared.

Figure 9.1.1.1: Procedure UUS_OCH_Check_Setup

Figure 9.1.1.2: Procedure UUS_OCH_Set_Info_In_IAM

Figure 9.1.1.3: Procedure UUS_OCH_Set_Alert_And_Connect_Param

9.1.2 Procedures in VLR

Figure 9.1.2.1 Procedure UUS_OCH_Check_Provision.

This procedure is called in the VLR during subscription checks for an outgoing call. It sets requested UUS service provision information in Complete call message. If any of the UUS services is requested as required and the service is not provided to the subscription, the check will fail and the call will be cleared.

Figure 9.1.2.1: Procedure UUS_OCH_Check_Provision