Hi Bob:

I use pfSense 2.0 with an ATA for two separate lines and another that only does outgoing for a third line (so no register)

I do no port forwarding. Only built firewall rules to allow the servers access to the wan address...

The two routers do have some differences. I know on earlier versions of pfSense the static port redirect did not happen on 5060. But would on 5079... I have no problem with redirect and in fact it helps. They have taken the 5060 static port out of the later versions as its easy enough to add if you need it...

With pfSense you can use a Siproxd package which if all the ata's are on on port (say 5060) then it will allow multiple ATA's on the same sip server... I dont think you'd need that as I dont...