I need some help. This house had at one time two different phone lines. We now have only one phone line working. I need to find out how to rewire one of the jacks that was hooked up to the other number. The phone company is going to charge us $120 to come out and do this, but they tell me that anyone who knows what they are doing can do this theirself. I need help I cannot afford to pay that much for a stupid phone line.