Thanks Grahame. I am a firm believer in not touching your router's port-forwarding or DMZ settings when using VOIP, and letting STUN handle it all for you. The only occasion you should ever manipulate your router's port-forwarding settings are the rare cases when you are hosting a web or email server at your IP address and you need port 80 to get directed to the right machine. That means 99% of people don't need to manipulate those options in their router. These days, even bit-torrent or gnutella clients will manage port-forwarding for you (via UPnP), and with SIP and VOIP using correct STUN and NAT settings in your device will take care of it. Its also simpler with less to troubleshoot in case something goes wrong. My two cents.
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