What is a fax number? Definition and usage

LAST UPDATE: August 30th, 2018

Definition

A fax number is a phone number that can be used to contact a fax machine. It looks exactly like a regular phone number.

Usage

Fax machines communicate over the phone network to send and receive information. They use audible tones to send and receive information.

Many offices have both a fax number and a phone number. Although fax operates over a phone line, it is a different phone number as fax services can interfere with services such as voicemail.

Sources and more resources

Fax AuthorityHow to get a fax number – Our guide to setting up a fax number.