Quote from: McKnight on June 02, 2017, 10:14:34 AM
I live in an old house that has two lines, so I want to make sure I disconnect the correct thing.
How old is "old"? If the house was built in the 1970s or after, it likely uses multi-conductor telephone wiring that conforms to a standard. Each line is a two-wire pair. One wire is a solid color, and the other wire is white, with stripes of that same color. Line 1 is blue/blue-white, and Line 2 is orange/orange-white, etc. If the house was built before then, it may use the very old standard -- a four-conductor cable with red, yellow, green and black wires. See the attached diagram.
You MUST disconnect the incoming telephone company wires from the point of entry into your building, known as the "demarcation" point or "demarc block". There should be a metal or plastic box somewhere, where this connection is made.
After you do that, then the method you use to connect the OBi to the house wiring depends on whether or not both of the two incoming telco lines are dead/disconnected, or if you still want to have working telco service on one of those lines, and use the OBi for the other line. What is your plan?