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Ti+  for  TS 24.228§7.2.3§7.3.5§7.4.3
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IMS S2 signalling flow - Session Initiation: mobile origination and termination in home network - IMS S2-1d. SIP INVITE request (UE1 to UE2): from I-CSCF2 to S-CSCF2
  • 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.