Quote Originally Posted by sr98user View Post
If you are forwarding ports (80% of UDP ports), I would think there is a good chance that you might have some problems.

But looking at the information below

http://www.anandtech.com/show/3626/a...-exploration/4

It looks like it uses an IPSEC tunnel (over UDP port 4500). The port numbers are below 5004. So, you might not have a problem.
Thanks for the URL! All my VOIPo port forwarding is above 5004, so this looks okay.