Provided by: dahdi_3.1.0-2_amd64 bug


       fxotune - automatically tune DAHDI FXO channels


       fxotune -i [options] - detect mode

       fxotune -d [ options ] - dump mode

       fxotune -s [ options ] - Startup mode


       fxotune is a script that fine-tune parameters of the FXO modules of the card. It has three
       modes of operation:

       Detect mode (-i): it detects and tunes all the available FXO channels.  It writes settings
       to  a configuration file (/etc/fxotune.conf) from which it can be loaded (e.g: at startup)
       using -s .

       Dump mode (-d): Runs detection on a single DAHDI channel,  and  just  dumps  waveforms  to
       fxotune_dump.vals is generated in the current directory.

       Startup mode (-s): fxotune just reads the settings from fxotune.conf into the FXO modules.

       You  are  advised  to  run  fxotune on all FXO ports you have that support it and that are
       connected. Note that the tuning is affected  by  e.g.   the  physical  parameters  of  the
       connection, and thus if it has been radically changed, you may need to re-run fxotune.

       This  program  only  works  for the Digium TDM400P/800P/2400P cards and compatible and the
       Xorcom Astribank devices. Other cards (notably X100P cards and clones)  do  not  have  the
       hardware to support such tuning.

       The  tuning  process needs a clear line to do the tuning.  In order to do that, it runs in
       cycles of the following: sets the line off-hook, dials a dial string (which should set the
       PSTN provider waiting for the next digit), and then starts tuning. It has a limited amount
       of time for tuning before the PSTN gives up and gives a busy tone. So  after  a  while  it
       hangs up and starts a new cycle.

       fxotune  has  two  operation  modes: tune (-i) and set (-s). In the tune mode it generates
       /etc/fxotune.conf, and in the set mode it merely applies the parameters from  fxotune.conf
       to device's ports.


       The  following  options  below  except  -v (verbose) affect only the detection process and
       hence apply only to the detect and dump modes.

       In addition, to maintain compatibility with older versions of fxotune,  if  in  detect  or
       dump  mode  there  is  a  parameter  with  option  before  it,  it is considered to be the
       dialstring parameter (-n).

       -b startdev
              Start tuning from dahdi channel num.  startdev:  skip  all  previous  channels.  By
              default starting from channel 1.

              In dump mode (-d) this is the single channel that will be tested.

       -e stopdev
              Tune only up to dahdi channel num.  stopdev: skip all previous channels. By default
              stopping at channel 252.

              In dump mode (-d) this parameter is ignored.

       -l delay-to-silence
              Time in seconds to wait after dialing the dial-string to get  a  clear  line.   The
              default is 0.  before

       -m silence-good-for
              Time  in seconds which states how long the PSTN will wait after we dialed the dial-
              string until it starts giving a busy tone. You  can  test  this  by  connecting  an
              analog phone to the line and dialing.

              The default is 18 (18 seconds).

       -n dial-string
              Digits to dial to the PSTN in order to get it stop its dialtone and waiting for the
              next digit.

              The default is "4" (sending just the digit 4). It should work in most cases. Again,
              this  can  be  tested  by connecting a phone to the PSTN line and dialing the dial-

       -t detect-type
              This option allows using the older detection method used by fxotune of Zaptel  1.2.
              use -t 1 for that older method. whereas -t 2 (the default) uses the current method.

              This option only applies to detect mode (-i).

              Sets debugging on. The more v-s, the higher debug level.

              Note that: -vv -v  will actually set debug level to 1 instead of 3.

       -w wave-form
              The  default:  -1,  for  multitone waveform. Alternatively: a frequency of a single

              This option only applies to dump mode (-d).


              fxotune -i 9
       if you need to dial 9 for an external line. If you always get a line, you can  simply  use
       any digit.

              Load settings from the last test. Used at startup.


              The  configuration  file  generated  by  fxotune  in  detect  mode  and  from which
              configuration is loaded when -s is used.


       Running fxotune takes approximately a minute per port. If you wish to only run fxotune for
       several ports, you can use the options -b and -e to set a specific range of ports. Another
       useful trick is to actually keep asterisk running, and only "destroy" the  dahdi  channels
       you wish to tune (dahdi destroy channel NNN): other channels will be used by Asterisk, and
       hence skipped. This can be useful if you have many FXO ports that are not connected.

       fxotune writes immediately to /etc/fxotune.conf so if you stop it half-way, you may get  a
       half-configured  system.  If you have already tuned your FXO channels and wish to test-run
       fxotune again, you are advised to backup /etc/fxotune.conf .

       The default for -m is 18 seconds. This assumes that you get a clear line for at  least  18
       seconds. It is advised that you test that timeout earlier by connecting a phone to the FXO
       line, dialing 4 (or whatever dial string you put with -n) and see how much time of silence
       you have.

       If  you  connect  your device to a PSTN provider that is not in the US, there is a similar
       operation you should apply before even getting  to  fxotune:  setting  the  opermode.  The
       opermode sets a number of country-specific parameters. For the Digium analog cards this is
       set through the kernel module parameter 'opermode' . For the Xorcom Astribank this is  set
       through  the  variable  'opermode'  in  /etc/dahdi/xpp.conf  .   For  valid values of this
       parameter, see  /usr/share/asterisk/init_fxo_modes  (FIXME:  this  has  changed  and  will
       change. Tzafrir).


       dahdi_cfg(8), dahdi_tool(8), dahdi_monitor(8), asterisk(8).


       This  manual  page  was  written by Tzafrir Cohen <> Permission is
       granted to copy, distribute and/or modify this document under the terms of the GNU General
       Public License, Version 2 any later version published by the Free Software Foundation.

       On  Debian  systems,  the  complete text of the GNU General Public License can be found in