Hello & Welcome,
I'm Greg and will do my best to assist you today.
Sorry I didn't see your question earlier and to hear of any issue you are having with your phones.
To help you with this issue, may I ask:
1) The FULL 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 you first notice (or were told) that this was happening?