Are you using a phone company voice
messaging service?
This is a voice messaging service used to replace telephone answering
devices. If the messaging service’s rings-to-answer setting is lower than
the product’s rings-to-answer setting, the messaging service answers
the call and the product is not able to receive faxes. If the product’s
rings-to-answer setting is lower than that of the messaging service, the
product will answer all calls and no call will ever be routed to the
messaging service. The only voice messaging solution that can be
successfully used with the product is a stand-alone telephone answering
machine.