IMS S3-7a. SIP 180 Ringing response (INVITE): from UE2 to P-CSCF2

back to TS 24.228

IMS S3 signalling flow - Session Initiation: Origination in CS Network, and Mobile termination in home network - IMS S3-7a. SIP 180 Ringing response (INVITE): from UE2 to P-CSCF2

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