IMS S4-7b. SIP 180 Ringing response (INVITE): from BGCF1 to S-CSCF1

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IMS S4 signalling flow - Session Initiation: Mobile origination in home network, Termination in CS network - IMS S4-7b. SIP 180 Ringing response (INVITE): from BGCF1 to S-CSCF1

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