it is easy, go to the electrical breaker panel, (basement or garage), the bell incoming wire will also be landed in the same location
there for, if you think the wire you found in basement is a bell wire. the other end of the wire should be easily found in the electrical breaker panel as well, after locking at the panel,if you see the same wire there. just follow 2 out the 8 colour coded wire to see which is hook to the bell jountion terminal, then these two wires are the pair hooked up for your home phone, good luck,
there for, if you think the wire you found in basement is a bell wire. the other end of the wire should be easily found in the electrical breaker panel as well, after locking at the panel,if you see the same wire there. just follow 2 out the 8 colour coded wire to see which is hook to the bell jountion terminal, then these two wires are the pair hooked up for your home phone, good luck,