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IMS S3 signalling flow - Session Initiation: Origination in CS Network, and Mobile termination in home network - IMS S3-7b. SIP 180 Ringing response (INVITE): from P-CSCF2 to S-CSCF2
  • Record-Route: the P-CSCF rewrites the Record-Route header field value to remove the port number and the comp=sigcomp parameter from its own entry.