Are you using a phone company voice-messaging service or an answering
machine?
If the rings-to-answer setting for the messaging service is lower than the rings-to-answer setting for the
fax accessory, the messaging service answers the call, and the fax accessory cannot receive faxes. If
the rings-to-answer setting for the fax accessory is lower than that of the messaging service, the fax
accessory answers all calls.