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Ti+  for  TS 24.228§7.2.4§7.3.5§7.4.3
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IMS S3 signalling flow - Session Initiation: Origination in CS Network, and Mobile termination in home network - IMS S3-1c. SIP INVITE request (UE1 to UE2): from S-CSCF2 to P-CSCF2