General Comments
                                       
   Note: Some commands are multiline and lines will be broken by '..'
   Most commands are followed by \r\nOK or \r\n\r\nOK and these will be
   excluded from the table but denoted by '...'
   
   The minimum command set should be:
+FCLASS   to get into class2
+FCR      to indicate you can receive
          Hmmm: has anyone done a class2 send
                only fax?
+FLID     to set your local station ID
          NOTE: some fax/modems implement this
                command but do not really
                support the CSID since they do
                not have the NVRAM chip to store
                it into.  What you will see is
                when people call you then won't
                see a CSID being identified
+FDCC     to set the DCE capabilities
+FDIS     to set the session parameters
+FDT      to start sending a page's data
          NOTE: most vendors do not seem to
                implement the AT+FDT=x,y,z...
                command so it is impossible to
                change the T.30 parameters
                during the fax job except by
                using AT+FDIS
+FET=0    to end a page's data
+FET=2    to end the fax
+FDR      to start receiving a page's data

   The following commands are only supported by Everex and Multi-Tech:
   +FBADLIN=, +FBADMUL=, +FCQ=, +FDT=, +FLNFC=, +FVRFC=, +FWDFC= These
   commands can make for some very powerfull software since you can
   support larger pages and have the fax/modem shrink it if necessary.
   
   +FBOR seems to have vendors who implement only orders 0 and 1 and some
   that implement all 3
   
   +FDCC=?/+FDIS=? seem to have various implementations in terms of
   capabilities: Everyone does normal/fine resolution. Anyone who has
   14400 fax does the bit rate but alot of vendors are not going for the
   14400. Most vendors are doing page widths for 1728, 2048, and 2432. A
   few do 1216 and Multi-Tech does all 5 widths. Everyone does the 3 page
   lengths. Everyone does the 1-D modified Huffman and 2-D modified Read
   compression. A few do 2-D uncompressed mode. NO ONE seems to do the
   2-D modified modified Read compression. NO ONE does Error correction
   mode NO ONE does Binary file transfer Everyone implements the 8 scan
   line times
   
   +FDCC? seems to be handle OK except by EXAR who decide not too dislay
   the first number and instead start the line with a comma.
   
   +FET=? doesn't seem to be implemented by anyone except Multi-Tech. You
   can't tell which codes are valid so ?all? are assumed? or ?none?
   
   +FLID is well supported by all vendors
  NOTE: most eveyone supports characters 32-127
        Everex supports 32,33,35-126
        ROCKWELL RC9624AC supports 32,33,35-96
          123-126
  NOTE: watch out for handling of "s around the
        +FLID string.
  NOTE: watch out for concatenating strings
  NOTE: some vendors implement the +FLID in
        non-volative RAM and some fax/modem
        models may not have the NVRAM chip and
        the +FLID will not be stored/transmitted
        correctly.

   +FLNFC is implemented by Everex and Multi-Tech and supports the
   conversion of 1D where there is a length mismatch
   
   +FLPL is implemented by Everex, Frecom, Multi-Tech, ROCKWELL 2496
   models and all SIERRA models.
   
   +FMDL is well supported by all vendors
   
   +FMFR is well supported by all vendors
   
   +FMINSP seems to be implemented in Everex, Frecom, Multi-Tech,
   ROCKWELL 2496 models, and all SIERRA models.
   
   +FPHCTO seems to be supported by Everex, Frecom, Multi-Tech, all
   ROCKWELL models, and all SIERRA models.
   
   +FPTS seems to be supported by Everex, Frecom, Multi-Tech, all
   ROCKWELL models, and all SIERRA models.
   
   +FRBC is not implemented by anyone!
   
   +FREL is advertised as supported by Everex, Frecom, Multi-Tech,
   ROCKWELL 2496 models, and all SIERRA models. But I have not been able
   to verify the correct operation of the byte alignment.
   
   +FREV seems to be implemented in most firmware with various formats.
   The most informative are the "version,date,chipset" type which give
   all the necessary information to work detect firmware version and
   chipset version to work around any problems.
   
   +FSPL seems to be implemented by Everex, Frecom, Multi-Tech, ROCKWELL
   2496 models and all SIERRA models.
   
   +FTBC seems to be implemented in older ROCKWELL 2496 models and all
   SIERRA models.
   
   +FVRFC doesn't seem to be implemented by anyone except Everex and
   Multi-tech who both do 1D vertical resolution conversions. No one does
   2D vertical resolution conversions.
   
   +FWDFC doesn't seem to be implemented by anyone except Everex (who
   only abort a connection on mismatch) and Multi-tech (who actually do
   width conversions).
     _________________________________________________________________
   
   
    Sam Leffler. Last updated $Date: 1994/10/19
    23:53:53 $.