IMS S4-7d. SIP 180 Ringing response (INVITE): from P-CSCF1 to UE1

back to TS 24.228

IMS S4 signalling flow - Session Initiation: Mobile origination in home network, Termination in CS network - IMS S4-7d. SIP 180 Ringing response (INVITE): from P-CSCF1 to UE1

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