Brad,
I have U-verse Internet service and have a Linksys PAP2T from VOIPo. Although I'm a very light phone user I haven't had any service issues. I have the PAP2T configured in the U-verse residential gateway in DMZplus mode. I chose to use the DMZplus instead of forwarding ports because I didn't want to take the chance that something could be blocked by the firewall. When the PAP2T requests a DHCP IP address, the residential gateway will provide it with its public IP address and any traffic not destined for another system on your network will go to the PAP2T. I have no idea if this bypasses the SIP ALG feature but it seems to work fine for me. If you haven't tried it yet already you may want to give it a shot. Settings -> Firewall -> Applications, Pinholes and DMZ -> Click the LinksysPAP in the Select a computer section -> Click the button for Allow all applications (DMZplus mode) -> Save. After the settings are applied, reboot your VOIPo adapter so it can update its IP address.
Jim
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