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Abstract
Faxing with Linux using ISDN cards is possible using the active card B1 from AVM
(which uses a embedded cpu and some dsp logic for this task) or the passive ISDN card Fritz!, also from
AVM (in this case the driver software does the faxing using the PC main processor).
For both cards a standardized programming interface - the CAPI - is available. CAPI is a wide spread, operating system
independent standard for accessing ISDN cards. Full specs are available for free from the
CAPI organisation. It has been used successfully for years in MS Windows.
The CAPI interface expects and delivers faxes in the "Structured Fax File" (SFF) format.
Converting SFF files
SffToBmp is a converter tool, written in C++, to transform SFF files to BMP, JPEG or multipage TIFF format. In addition
generation of PBM files (Portable Bitmap) is also possible which can be transformed into nearly any other
graphics format using the PBMPLUS tools that are included in almost every Linux distribution nowadays.
It is a console tool - so, all windows users out there, please note: No GUI, run it in a "dos box" or
use it for mass conversion with MS Scripting Host.
Changelog
NEW in version 3.1:
- Changed message output from stderr to stdout except errors
- Added -quiet switch
- SffToBmp now allows up to 2048 bytes garbage at the beginning of the file before throwing the towel
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