I have a RT31P2 that I received from Voipo. My home network is set as such:

Cable Modem -> Router -> Voipo
All other machines on the network are connected to the router

Voipo ATA has the ip address 192.168.1.5. However, when I open a web browser and type in http://192.168.1.5, I cannot access the web interface. Is there a "trick" to show up? If I connect the laptop to the ATA, I can browse fine.. but I would rather like to connect through the router.