IMS S3-6b. SIP 200 OK response: from P-CSCF2 to S-CSCF2

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IMS S3 signalling flow - Session Initiation: Origination in CS Network, and Mobile termination in home network - IMS S3-6b. SIP 200 OK response: from P-CSCF2 to S-CSCF2

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