Normal phone wiring has two pairs. If you're keeping your regular line, or have DSL on it, the yellow and black wires are the pair to use for a secondary line throughout the house.

Hi all My first post here. I would like to use ethernet rather than wifi in our house and was looking into using the preinstalled phone jacks in various rooms around the house as a possible way to ...

There are phone cables running into the box (older homes may have "2 wire" or "4 wire" while newer homes have category 5, aka cat 5), which you can access.

The wiring must meet applicable National Electrical Code standards. The landlord is responsible for the cost of any repairs required to bring the jack and the wiring up to standard.

Very useful new post on Engadget entitled How-To: Wiring VoIP to your phone jacks.In this piece, Engadget's Will O'Brien describes and illustrates the process.

My house has a bunch of telephone jacks (around 8?) and they are all home-run directly to the telco box outside the house. I'd like to place my voip adapter in the basement and use it to power all ...