Install sfftobmp by entering the following commands in the terminal:
sudo apt update sudo apt install sfftobmp
Description:
SFF (Structured Fax File) Converter
Tool to convert "Structured Fax Files" into Windows bitmaps (BMP), Portable Bitmaps (PBM), JPEG Pictures (JPG) and single or multi-page TIFF Images. . SFF means 'Structured Fax File', intended by the CAPI interface to be used to save incoming faxes. Within GNU/Linux it's e.g. the AVM-B1 card which creates such files.
Homepage: http://sfftools.sourceforge.net/
Version: 3.1.3-5build5
Section: universe/graphics