[App_rpt-users] changing IAX port

I'm installing a second computer here to drive Yet More RF out of the House of RF here...and since I'm doing so...wondering where on the mother ship do you change the port that IAX is configured for. I think I see where, in the config files, you change it...but, obviously, the head end has to know where the handshake is supposed to go. Am I missing something? Not that that would be out of character (according to my bride...), but...just thought I'd ask. Tnx Bryan WB0YLE