NO.
Forget that I said anything about Magic Jack.
I have a requirement for THREE lines, so I will continue to move the one telco line I have from one FXO port to the other to test each inbound and outbound route situation I need.
Each FXO port has an individual line DID assigned to it.
Currently:
Port 1 Incoming calls go the the assigned Ring Group. Outbound calls from that Ring Group go to that port and work properly.
Port 2 incoming calls go to the Extension with the FAX machine, but the PBX hangs up before the FAX machine can answer. Outgoing calls from that extension go the the correct port and work properly
Port 3 incoming calls get a busy a busy signal. Outgoing calls get a busy signal.