2 phone cords into 1 wall?

if i run 1 phone cable into the wall from say a voip by just plugging it in a jack it goews to every jack in the house. now say i hooked another live phone cord into another jack then plugged a phone into a third jack, what service is the third phone using? line one, 2, or both?

If you connect two different phone sources (VoIP and POTS) into seperate but interconnected phone jacks in your home, you're likely to cause major screw-ups in your phone line, and neither one will work. If you insist on having VoIP and a plain land-line, you'll need to run two separate sets of phone cables through the house, and mark each jack as to which system they're on. Most phone lines in a house are designed to have two separate phone services on them. If you opened the jack you will either see a set of reg/green and yellow/black wires or a blue/white and orange/white wires. These are designed to work on individual lines. As long as they are set up properly at the Outside Network Interface (ONI) you may run separate phone lines. The color of the wires really depends upon when the wire was installed. Roughly pre-1995 you will mostly see the red-green and yellow black configuration. I hope this helps. Dansinger and J M are both correct.

If you simply plug both voip and POTS (normal phone service) without taking wiring into account you will probably have problems. Most typical normal phones use the red/green (inside) two wires on a standard phone plug. Because of this you will probably connecting your phone system up to two different sources at the same time. Your third phone could simply not work, or it could be calling out of one or the other or both (perhaps at the same time.)