Do you mean the T1200H? I am not aware of a V1200H, just a V1000H.
You can port forward port 1 of the T1200H to your router (see Advanced Settings in the Gateway web interface)
You can set your PVR etc on the other ports of the Actiontec T1200H
Set your router on other than 192.168.1.xxx and you should be ready to go.