Greetings. I have an existing "old" PBX that I would like connect via PRI to a PSTN gateway that in turn is connected to my 3CX PBX. I can figure out how to allow my 3CX SIP extensions to dial the "old" PBX via an outbound rule, but I can't figure out how to make the 3CX box receive the inbound call from my "old" PBX and route it out to my ITSP. Ideally I would simply have the 3CX box receive all digits from old PBX via the PSTN gateway and forward them out through my VOIP provider but I can't figure out how to do it. Any advice would be greatly appreciated.