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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 S2-1e. SIP INVITE request (UE1 to UE2): from S-CSCF2 to P-CSCF2
  • S-CSCF#2 remembers (from the registration procedure) UE2 Contact address and the next hop CSCF for UE2.
  • Route: Built from the Path header stored at registration.
  • Via:/Record-Route: S-CSCF2 adds itself.
  • P-Called-Party-ID: Includes the dialled URL with its parameters.