Fax Demodulator – Intercept Fax Signals
The difference between a fax demodulator from a regular fax machine is that the fax demodulator can only be used to observe the fax signal – it does not participate in the fax handshake or two way communication that occurs between fax machines.
Use of Fax Demodulators for Legal Purposes
A fax demodulator (either a software or hardware version) is commonly used to intercept fax signals over PSTN communication lines. An example of this software and how it is used can be found from the company Vocal Technologies.