I have internal extensions from 100 to 199 and SIP trunk to an external telephony system. I would like to identify outbound calls from each internal extensions to the external system with its own callerID. I have tried to set up SIP field "From:User Part" to values "OriginatorCallerID" or "CallerNum" in VoIP Providers-> Trunk-> Outbound Parameters. But "Port Identification" field from trunk's settings is always used in SIP header for outbound calls, and internal numbers are screened by this one number. Is it possible to configure 3CX to send internal extension number as a callerID for calls to the external system?