Hello Howard & Welcome to Just Answer,
Sorry to hear of any issue you are having with your fax/phones.
To help you with this issue, may I ask:
1) The Make & Model Number of the FAX system you are working with?
2) The FULL model number of the phone system you are working with? (it looks like you may have missed a digit or two).
3) What phone service provider (phone company) you have for this phone line?