IMS S3-11c. SIP ACK request (UE1 to UE2): from P-CSCF2 to UE2

back to TS 24.228

IMS S3 signalling flow - Session Initiation: Origination in CS Network, and Mobile termination in home network - IMS S3-11c. SIP ACK request (UE1 to UE2): from P-CSCF2 to UE2

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