Check out this post and see if it applies CLICK HERE
mole:
It's not hard to add a second router. Just keep the subnets separate. If the actiontec is 192.168.1.1, make your second router 192.168.2.1, take a short cable to connect one of the four ports on the actiontec into the wan port on your new router. The post from verizon indicating interference from phones looks useful, although I'm not sure I want to replace all of my cordless phones.