[darkpuppet]

I would recommend that if you can, run your router directly from your demarcation point.

You aren't using Rogers home phone, are you? if so, it's still pretty simple, cable --> splitter --> cable modem (or mau) --> router. With the other splitter going to one way amps to your TVs.

Remember that signal strength isn't the only thing that affects the speed of your bandwidth. The base signal carriers that determine the time slices used by your modem are another thing to worry about. These are responsible for allowing your modem to sync up and send transmissions at a given speed over all that shared traffic. Amplifying can add latency to the signals that can fall below optimal ranges and affect your maximum speed. It all depends on how much crap there is between you and the backbone.

So, signal : noise is good, but lower signal latencies is typically better -- and often crucial for UDP protocols like VOIP.

When it comes to cable infrastructure in your household, do as little as you possibly can to only fix what's wrong, since there's always a risk that adding more will only cause trouble.

Your router should be able to handle all of the traffic, but you'll probably want to set up QoS to ensure enough bandwidth is reserved for your VOIP. Get me your router model number and VOIP setup details and I can get you settings...