Are You Using A Phone-Line Splitter; Are You Using A Surge-Protection Device; Are You Using A Phone Company Voice-Messaging Service Or An Answering; Machine - HP mfp analog fax Handbuch

Are you using a phone-line splitter?

Parallel or "T" phone-line splitters should not be used with the fax
accessory, because they can degrade the quality of the phone signal.

Are you using a surge-protection device?

A surge-protection device can be used between the wall jack and the fax
accessory to protect the fax accessory against electrical power passed
through the phone lines. These devices can cause some fax
communication problems by degrading the quality of the phone signal. If
you are having problems sending or receiving faxes and are using one of
these devices, connect the fax accessory directly to the phone jack on
the wall to determine whether the problem is with the surge-protection
device.
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 is not able to 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, and no calls are
routed to the messaging service.
Is your fax set up correctly? 31
ENWW