Quote Originally Posted by 1bird2 View Post
I think you are on to something with the GS 502 device behind the router. Every other Voip provider I have used wanted me to enable specific port forwarding. STUN methods *should* work -- perhaps the other providers know something and why they don't use that method.

-bird
I wish it were that easy, but we've tried that with quite a few users and it doesn't solve it for all unfortunately.