Version: 0.8.1 (using KDE 4.2.1) OS: Linux Installed from: Ubuntu Packages Currently there is no KDE app that handles *.sff fax-files comming from capisuite. So, i think okular si the place to wish such a feature. The only apps to handle *.sff are: sffview - ugly and bad rendering sfftobmp - commandline tool to convert Ralph.
Structured Fax File Format Description: http://delphi.pjh2.de/articles/graphic/sff_format.php
Structured Fax Files are now very outdated, so I am closing this request. While it could be done, it is likely not worth the effort. Please reopen if this support is still wanted today.