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IMS S3 signalling flow - Session Initiation: Origination in CS Network, and Mobile termination in home network - IMS S3-2b. SIP 183 Session Progress response: from P-CSCF2 to S-CSCF2
  • Record-Route: the P-CSCF rewrites the Record-Route header field value to remove the port number used for the security association and the comp=sigcomp parameter from its own URI.
  • P-Asserted-Identity: P-CSCF inserts the default SIP URI of the user in the P-Asserted-Identity header field.