IMS S2-10b. SIP 200 OK response (INVITE): from P-CSCF2 to S-CSCF2

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IMS S2 signalling flow - Session Initiation: mobile origination and termination in home network - IMS S2-10b. SIP 200 OK response (INVITE): from P-CSCF2 to S-CSCF2

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