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TS 24.228 – §7.2.3 – §7.3.5 – §7.4.5   List   Prev   None
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IMS S5 signalling flow - Session Initiation: Mobile origination and termination in home network, but terminating UE roaming and busy - IMS S5-1d. SIP INVITE request (UE1 to UE2): from I-CSCF2 to S-CSCF2
  • The I-CSCF 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.