You have raised a very good point. If you forward the BTH port on the pfsense to the MT router, MT should figure out that the relay server is not required. You should note that when creating the BTH enable, the router auto generates an input chain rule for that port on the router and that is the port that should be port forwarded on the pfsense. Dont see why other ports should be involved… I have posed the question to support, and hopefully will receive a response./…