The basic technology is not changing. It's still a tone that gets delivered, but now to a fax server instead of a fax machine. I would have thought that the resolution would have improved over the years but it's remained a low resolution service.
However, there is one thing that the old fax machines excel in; document security. Faxing from one machine to another machine is almost totally secure. It goes through the phone lines and nothing is left on a computer, server or e-mail account. The document is on paper with no electronic trail. Here's an interesting article that answers the question; Are faxes secure?
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