One of the biggest problems with this story is Karen phoning back and asking him to stop the fax.

Sorry, but faxes don’t work like this.

A fax takes in the entire transmission over the phone line, ends the call, and then - IF it has been set up to do so, instead of just storing the fax - it prints it out.

Which means that Karen had every ability to tell her fax to stop the print job herself. A fax is not like a printer, where the sender has the ability to tell the printer to pause or cancel the job. Once the fax starts printing, that original communication - the phone call with the fax transmission - has long since ended.

And if this fax machine can retrieve faxes from a fax server elsewhere on the network or on the Internet, that communications disconnect is even more severe.

Which makes me very suspicious of the entire story.