do you check port forwarding

[voipinit]

You would normally setup port forwarding in your router, if your ATA was behind your router. Since your router is behind your ATA, port forwarding does not apply to you. Your internet connection (cable, DSL) is plugged from the cable or dsl modem into the WAN port of the ATA - right?

[5122004650]

that is correct

[Russell]

that is correct

What kind of broadband connection do you have? Does your modem also function as a router - I suspect not since you mention a separate router but it never hurts to ask. If it does function as a router you may still need to port forward in your "modem-router".