“I currently live in an 80-year-old house. The phone wiring has been updated, but the routing of the wiring is a jumble of three different incoming lines routed to different sections of the house.This didn’t matter to me when I moved in because we don’t have a landline phone. In newer houses, this won’t be a problem because all phone wiring should terminate at a central location.
Most home phone wiring is made up of two pairs of wires: red/green and yellow/black. In most cases, the primary line you’ll want to connect to route your VoIP service throughout the house is the red/green pair. If the house was wired using category 5 cabling, green might be replaced with white-with-blue-stripe wires and red with blue-with-white-stripes. The yellow and black wiring pair will not be needed.”
Read the full story at JakeLudington.com