IMS S2-7d. SIP 180 Ringing response (INVITE): from I-CSCF2 to S-CSCF1

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IMS S2 signalling flow - Session Initiation: mobile origination and termination in home network - IMS S2-7d. SIP 180 Ringing response (INVITE): from I-CSCF2 to S-CSCF1

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