Home phone lines short, low resistance
I was trying to phone home and was always getting the engaged tone.
Got home and discovered that the phone line to the house from Verizon was OK. I plugged in a "basic" phone at the house junction box and got a tone.
I disconnected all the phone pairs coming in and tested eash one. All where open circuit except for one which had a resistance of about 129 ohms. This was the one that was causing the line to get the engaged tone. I removed that one and and reconnected the others, and everything worked. I have one line, not sure where it goes to, which is not connnected.
Can someone tell me:
1) What could cause such a low resistance "short" in a line not connect to anything? I removed all phones etc.
2) How can I trace / track the line to the other end of it so that I can investigate further.