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IMS S5 signalling flow - Session Initiation: Mobile origination and termination in home network, but terminating UE roaming and busy - IMS S5-1f. SIP INVITE request (UE1 to UE2): from P-CSCF2 to UE2
  • Via: The P-CSCF adds the port number negotiated during the security agreement and the comp=sigcomp parameter to its Via header.
  • Record-Route: The P-CSCF adds the port number negotiated during the security agreement and the comp=sigcomp parameter to its own URI.
  • P-Media-Authorization: A P-CSCF generated authorization token. This particular example shows a Policy-Element generated by "pdf1.home1.net" with credentials "31S14621".