IMS S2-7f. SIP 180 Ringing response (INVITE): from P-CSCF1 to UE1

back to TS 24.228

IMS S2 signalling flow - Session Initiation: mobile origination and termination in home network - IMS S2-7f. SIP 180 Ringing response (INVITE): from P-CSCF1 to UE1

Record-Route: P-CSCF1 rewrites the Record-Route header to add the comp=sigcomp parameter to its own SIP URI and its port number negotiated during the security agreement.