23.0873GPPRelease 17Stage 2TSUser-to-User Signalling (UUS) supplementary service
9.2.1 Procedures in GMSC
Figure 220.127.116.11 Procedure UUS_GMSC_Check_Forwarding.
This procedure is called when Resume Call Handling message is received from the remote MSC. If the message contains UUS related information, that is copied to the subsequent IAM message.
Figure 18.104.22.168: Procedure UUS_GMSC_Check_Forwarding
9.2.2 Procedures in MSC
Figure 22.214.171.124 Procedure UUS_ICH_Check_Support.
This procedure is called after Alerting/Connect message is received from B-subscriber. It checks whether UUS service is possible and if not whether the call setup can be continued.
Figure 126.96.36.199 Procedure UUS_ICH_Check_Forwarding.
This procedure is called when no reply is received from B-subscriber. It checks whether call forwarding is allowed from UUS service point of view.
Figure 188.8.131.52 Procedure UUS_ICH_Handle_LCF.
This procedure is used to add UUS information to Resume Call Handling message when Optimal Routeing late call forwarding is supported.
Figure 184.108.40.206 Procedure UUS_ICH_Set_Info_In_IAM.
This procedure is used to add UUS specific information to forwarded call IAM message.
Figure 220.127.116.11 Procedure UUS_ICH_UUS1_Implicit_Active.
This procedure is used to set UUS1 implicit service active at the remote MSC when only UUI for service 1 is received.
Figure 18.104.22.168: Procedure UUS_ICH_Check_Support
Figure 22.214.171.124: Procedure UUS_ICH_Check_Forwarding
Figure 126.96.36.199: Procedure UUS_ICH_Handle_LCF
Figure 188.8.131.52: Procedure UUS_ICH_Set_Info_In_IAM
Figure 184.108.40.206: Procedure UUS_ICH_UUS1_Implicit_Active