IMS S3-7d. SIP 180 Ringing response (INVITE): from I-CSCF1 to MGCF1

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IMS S3 signalling flow - Session Initiation: Origination in CS Network, and Mobile termination in home network - IMS S3-7d. SIP 180 Ringing response (INVITE): from I-CSCF1 to MGCF1

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