IMS S1-11b. SIP ACK request (UE1 to UE2): from P-CSCF1 to S-CSCF1

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IMS S1 signalling flow - Session Initiation: Mobile origination and termination roaming, with different network operators - IMS S1-11b. SIP ACK request (UE1 to UE2): from P-CSCF1 to S-CSCF1

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