A fax demodulator is a device that can be used to intercept fax signals, either over a phone line or a radiofax signal.
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.
The term “fax demodulator” can be used for any type of fax demodulator, from interception of analog signals to the digital and ip based signals that occur over a T.38 fax connection.
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.
In general, as fax is intended to be transferred over PSTN and telephone communication lines, the use of a fax demodulator is primarily under the umbrella of laws regarding wiretapping in general.
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