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Ti+  for  TS 24.228§7.2.2§7.3.2§7.4.2
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IMS S1 signalling flow - Session Initiation: Mobile origination and termination roaming, with different network operators - IMS S1-1d. SIP INVITE request (UE1 to UE2): from I-CSCF2 to S-CSCF2
  • NOTE: I-CSCF2 does not add itself to the Record-Route header, as it has no need to remain in the signalling path once the session is established.
  • S-CSCF#2 validates the service profile of this subscriber and evaluates the initial filter criterias.