Do you have broardband. IF so plug phone into socket without your router connected. check the main filter, the one connecting the phones and BB to the socket If not, if you have a bt socket, unscrew the front lower plate, and plug phone into the socket direct. try that. Try a standard phone, not cordless. I allways keep one just in case, As you should, With cordless, power cut, they are useless, Allways keep a normal basic corded phone. If ok with basic, your cordless faulty, If ok plugged in direct, part of socket faulty, if ok with filter out, filter faulty
SD, July 2012