I have multiple PBXs sitting behind one WAN address. I use PJSIP and by default it's port is 5060, however, I have multiple clients that need to access their own PBX so here is my plan.
My plan is to have PJSIP listen on different ports for each PBX i.e. PBX-1 listens on port 5070 and PBX-2 listens on port 5071 etc, etc. But RTP traffic still needs to listen on ports 10000-20000.
I know I can't forward individual ports to multiple machines but what about a port range? Is that possible?