[App_rpt-users] 2 nodes under the same IP

I have two separate boxes, one node on port 4570 and the other on 4569. They can both take inbound and outbound calls, however, they can't connect to each other. I don't know if it is the mikrotik router, or the way Mountain BB is configured, but a loopback call can not be made. Is there any solution to fix this without assigning private nodes? 73 Skyler