IMS S1-10b. SIP 200 OK response (INVITE): from P-CSCF2 to S-CSCF2

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IMS S1 signalling flow - Session Initiation: Mobile origination and termination roaming, with different network operators - IMS S1-10b. SIP 200 OK response (INVITE): from P-CSCF2 to S-CSCF2

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