IMS S2-7b. SIP 180 Ringing response (INVITE): from P-CSCF2 to S-CSCF2

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IMS S2 signalling flow - Session Initiation: mobile origination and termination in home network - IMS S2-7b. SIP 180 Ringing response (INVITE): from P-CSCF2 to S-CSCF2

Record-Route: P-CSCF2 rewrites the Record-Route header field value to remove the port number and the comp=sigcomp parameter from its own entry.