Fax Servers for Linux/AIX


 
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Old 02-23-2008
Fax Servers for Linux/AIX

At the company where I work, use a product called VSI-FAX. It works nicely, but the maintenance has proven to be very poor grade. So, I'm interested in any experiences using other fax servers that run on Linux or AIX and what issues/gotchas were run into and overcome and how.

I'm considering Hylafax because it seems to have a commandline option similar to vfx in VSI-FAX.

Any help available on this would be greatly appreciated.
 
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Fax Formats(1)						      General Commands Manual						    Fax Formats(1)

       This page, part of the Netpbmuser'sguide(1) , describes FAX formats in relation to Netpbm facilities.

       The  ITU  (formerly CCITT) publishes standards for operation of fax machines (the idea is to provide a way to be sure that a fax machine is
       able to receive a fax sent by another).	These standards incidentally specify graphics file formats -- a protocol for representing a visual
       image in sequences of bits.

       The  two  relevant  standards  are  called Group 3 (G3) and Group 4 (G4) (Groups 1 and 2 are analog standards no longer in use).  Virtually
       every fax machine in existence conforms at least generally to at least one of these standards.

       The standard for Group 3 fax is defined in ITU Recommendation T.4.  In the U.S., that is implemented by EIA standards EIA-465 and  EIA-466.
       These  standards  cover more than the file format as well, including how to transmit bits over a telephone line and procedures for handling
       document transmissions.

       G3 faxes are 204 dots per inch (dpi) horizontally and 98 dpi (196 dpi optionally, in fine-detail mode) vertically.

       The standards specify three file formats (also called coding methods and compression schemes -- remember the standard doesn't mention  com-
       puter files; it talks about the format of a stream of bits travelling over a telephone line):

       MH     This compresses in one dimension: it compresses individual raster lines but makes no attempt to compress redundancy between lines.

	      One  dimensional compression is traditionally the best a fax machine could handle because G3 neither assumes error free transmission
	      not retransmits when errors occur, and receiving fax machines traditionally could not afford to buffer much of a page.  It's  impor-
	      tant that when there is an error in a raster line, its impact not spread to many lines after it.

	      All Group 3 and Group 4 fax machines must be able to send and receive MH.

	      MH  is  sometimes  called  'G3,' but that is a poor name because while the Group 3 standard does specify MH, it has always specified
	      other formats too.

	      MH is sometimes called 'T4' based on the name of the document that specifies it, ITU T.4.  But this is a poor name because T.4  also
	      specifies MR.

       MR     This compresses in two dimensions, horizontally and vertically.

	      MR  has  always been part of the Group 3 standard, but is optional (a Group 3 fax machine may or may not be able to send and receive
	      it).

       MMR    This is a more advanced format than the others.  It is even more two-dimensional than MR.  It is optional in the Group  3  standard,
	      and  didn't  even  exist	in  earlier  versions of it.  It was developed specifically for the Group 4 standard, but then added to an
	      extended Group 3 standard as well.

	      MMR is sometimes called Group 4, but that is a poor name because of the fact that it is also part of the current Group 3 standard.

	      MMR is sometimes called 'T6' based on the name of the document
	       that specifies it, ITU T.6.

       g3topbm converts the MH format to PBM.  pbmtog3 converts PBM to MH.

       There is no Netpbm program to convert to or from other fax formats.

TIFF
The TIFF format is flexible enough to allow lots of different coding methods, within it. There are TIFF subformats for MH, MR, and MMR, among others. These are particularly useful when you receive a fax as a TIFF file. tifftopnm recognizes and can convert from any of these. pamtotiff can convert to any of these; you use command options to choose which. netpbm documentation 03 December 2008 Fax Formats(1)