Hello & Welcome to Just Answer,
I'm Greg and will do my best to assist you today.
Sorry to hear of any issue you are having with your phones.
To help you with this issue, may I ask:
1) What is the AGE of this system?
2) WHEN did this issue first begin?
3) Do you have at least one cordless handset that DOES ring, so we can COMPARE it with the ones that are not working?
Please REPLY using the box below.