It's an optional device that is installed on a multifunction printer (Kyocera Taskalfa 2554ci), and it's a telephonic transmission of scanned-in printed material, including text or images.
My apologies if I am in the wrong forum. Thank you.
Wish I could help, but this is very niche information that the vendor of the machine would be best asked directly. Otherwise the manual that @CapitalOne
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