Hello & Welcome to Just Answer,
Sorry to hear of any issue you are having with your phones.
To help you with this issue, may I ask:1) The Make & Model Number of the phone system you are working with?2) WHEN did this issue first begin?3) What phone service provider (phone company) you have for this phone line?4) If you have ANY other devices (phones, fax, alarm system, etc.) attached to this same phone line (not part of the MAIN system), and if so, are they working properly?
Please let me know if you change your mind - I'm here almost every day to help.
Take Care, Greg A.