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Ti+  for  TS 24.228§7.2.3§7.3.6§7.4.4
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IMS S4 signalling flow - Session Initiation: Mobile origination in home network, Termination in CS network - IMS S4-1b. SIP INVITE request (UE1 to UE2): from P-CSCF1 to S-CSCF1
  • S-CSCF#1 validates the service profile of this subscriber and evaluates the initial filter criterias. For this example, assume no Application Server involvement.
  • S-CSCF#1 performs an analysis of the destination address, and determines the destination is on the PSTN. S-CSCF forwards the INVITE request to the BGCF in the local network.