Quote Originally Posted by christcorp View Post
So, bottom line. Make your router as basic as possible. No firewall turned on. No ALG turned on. No UPnP turned on. Give your Voip Adapter a static IP address of 192.168.1.x or whatever, so it's the SAME IP address ALL the time. Port forward in the router the ports necessary to that IP address. Then, use LOCAL software firewall, virus protection, etc... on each machine to protect them from outside influences.
I agree with holmes4. I don’t see any need to disable SPI unless your router is having firewall issues. Forwarding ports or DMZ is supposed to open up a clear tunnel through the SPI firewall. If you find port forwarding or DMZ is not working correctly with SPI enabled, then I’d be looking for another router to buy…..