Hello & Welcome to Just Answer,
Sorry I didn't see your question earlier and to hear of the issue you are having with your phones.
May I ask:1) The Make & Model Number of the phone system you are working with?
2) What phone service provider (phone company) you have for this phone line?
3) WHEN did this issue first begin (or was noticed)?4) If you have ANY other devices (phones, fax, alarm system, etc.) attached to this same phone line (not part of the main system)?
5) Can you still get INCOMING calls (& TEST this by calling your number from another phone)?
I see it has been a few days and I just wanted to follow up to see if you have any more questions concerning this issue or if the issue was resolved.
I look forward to any further questions or results that you may have.
Thanks, ***** *****