IMS S5-2a. SIP 486 Busy Here response: from UE2 to P-CSCF2, followed by ACK

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IMS S5 signalling flow - Session Initiation: Mobile origination and termination in home network, but terminating UE roaming and busy - IMS S5-2a. SIP 486 Busy Here response: from UE2 to P-CSCF2, followed by ACK

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