NAME

       dahdi_monitor - checks the Rx/Tx levels of a DAHDI channels

SYNOPSIS

       dahdi_monitor  num  [-v[v]]  dahdi_monitor  num  [-o]  [<-f|-F>  FILE] dahdi_monitor num [[<-r|-R> FILE]]
       [[<-t|-T> FILE]]

DESCRIPTION

       dahdi_monitor monitors a Dahdi channel. It can record the output to a file, play it to  the  speaker,  or
       visualize the audio levels on the terminal.

       Recorded  audio  files  are  by  default  raw  signed  linear PCM. If the file name ends with ".wav", the
       recorded file will be a WAV file.

       The visual display shows the current audio level at both the Rx  (audio  Received  by  Asterisk)  and  Tx
       (audio Transmitted by Asterisk)

       To exit the program, press Ctrl-C.

OPTIONS

       The first (mandatory) parameter is the number of the channel to monitor.

       -m
              Multiple  channels.  Don't  multiplex  both  Rx  and  Tx  in a single channel.  Normally there's a
              different option that you need that implies it.

       -o
              Plays the output to OSS (/dev/dsp). Requires -m not to be used.

       -v
              Display Visual audio levels. With two v-s, Verbose mode is enabled, that shows the  actual  levels
              as numbers. Note that this requires a terminal wider than 80 columns to be properly displayed.

              Implies -m.

       -f FILE
              Record the content of the channel (Tx + Rx) to a file.

       -F FILE
              Record the content of the channel (Tx + Rx) before the echo canceler to a file.

       -r FILE
              Record the content of the Rx channel to a file.

              Implies -m.

       -R FILE
              Record the content of the R channel before the echo canceler to a file.

              Implies -m.

       -s FILE
              Record the content of the Tx and Rx of the channel to a file.

       -S FILE
              Records a stereo of both Tx and Rx of the channel before the echo canceler to a file.

       -t FILE
              Record the content of the Tx channel to a file.

              Implies -m.

       -T FILE
              Record the content of the Tx channel before the echo canceler to a file.

              Implies -m.

EXAMPLES

       Visualize audio levels on DAHDI channel 2:

         dahdi_monitor 2 -v

       Record channel 3 to a file:

         dahdi_monitor 3 -f output.raw

       This  will create a raw PCM file (signed-linear, 8kHz, mono, 16 bits per sample). Both the Tx and Rx will
       be multiplexed in a single channel.  It can be converted to a WAV file using e.g.:

         sox -s -c1 -2 -r8000 output.raw output.wav

       Record Tx and Rx of channel 5 to separate files. This time directly to WAV files:

         dahdi_monitor 5 -r output_rx.wav -t output_tx.wav

       Record channel 8 to a stereo file (Tx and Rx on its two channels):

         dahdi_monitor 8 -s output.raw

       Converting it to a WAV file:

         sox -s -c2 -2 -r8000 output.raw output.wav

SEE ALSO

       dahdi_tool(8), dahdi_cfg(8).

AUTHOR

       This manual page was written by Santiago Ruano Rincón <santiago@unicauca.edu.co> for  the  Debian  system
       (but may be used by others).  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.

                                                   9 Sep 2011                                   DAHDI_MONITOR(8)