There could be DC voltage on the ringer circuit. When a phone line is not in use there should be 0 Volts on the ringer circuit. Sometimes a device connected to your line can "leak" voltage on to the ringer circuit, and some phones will see this as a continuous ring signal.
1. Check all of the telephone cables and any power cables - are they securely plugged in?
2. Remove every device connected to your phone line except the phone that was ringing continuously.
3. If the ringing stops, put the devices back one at a time and see which one causes the problem.
4. If the ringing does not stop, the fault is either in the telephone or your master socket.
5. If you have another phone that is known to be working, try it out to see if it has the continuous ringing.
6. If the problem no longer occurs, there could be a problem the telephone equipment, and you should contact the telephone's manufacturer for support.
7. If the test phone has the continuous ringing, call your telephone provider and tell them that there may be a short circuit in your phone line.
8. If the problem happens only with your cordless phone, and not a corded phone, then it could be interference from a device such as a wireless broadband router or microwave or the cordless handset batteries may not be charging properly.
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