Re: phones
Could be a number of problems. Can you take just one phone around and it works on all jacks except one using the same satin cord? If so it might be the receptacle in the jack, or a loose connection inside the jack or at a splice.
Lift the reciever at the bad jack and listen to the dial tone, see if it sounds weak.
Another thing is the phone could be polarity sensitive. Lift the reciever, listen for dial tone, then push a button and listen for the touch tone. If you do not hear it, try reversing the red and green wires in the jack and see what happens.