1DAHDI_MONITOR(8)                                              DAHDI_MONITOR(8)
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NAME

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

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

14       dahdi_monitor monitors a Dahdi channel. It can record the output  to  a
15       file, play it to the speaker, or visualize the audio levels on the ter‐
16       minal.
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18       Recorded audio files are by default raw signed linear PCM. If the  file
19       name ends with ".wav", the recorded file will be a WAV file.
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21       The  visual display shows the current audio level at both the Rx (audio
22       Received by Asterisk) and Tx (audio Transmitted by Asterisk)
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24       To exit the program, press Ctrl-C.
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OPTIONS

28       The first (mandatory) parameter is the number of the channel  to  moni‐
29       tor.
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31       -m
32              Multiple  channels.  Don't  multiplex both Rx and Tx in a single
33              channel.  Normally there's a different option that you need that
34              implies it.
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36       -o
37              Plays the output to OSS (/dev/dsp). Requires -m not to be used.
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39       -v
40              Display  Visual  audio  levels.  With  two  v-s, Verbose mode is
41              enabled, that shows the actual levels as numbers. Note that this
42              requires  a  terminal  wider than 80 columns to be properly dis‐
43              played.
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45              Implies -m.
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47       -f FILE
48              Record the content of the channel (Tx + Rx) to a file.
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50       -F FILE
51              Record the content of the channel (Tx + Rx) before the echo can‐
52              celer to a file.
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54       -r FILE
55              Record the content of the Rx channel to a file.
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57              Implies -m.
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59       -R FILE
60              Record  the content of the R channel before the echo canceler to
61              a file.
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63              Implies -m.
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65       -s FILE
66              Record the content of the Tx and Rx of the channel to a file.
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68       -S FILE
69              Records a stereo of both Tx and Rx of  the  channel  before  the
70              echo canceler to a file.
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72       -t FILE
73              Record the content of the Tx channel to a file.
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75              Implies -m.
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77       -T FILE
78              Record the content of the Tx channel before the echo canceler to
79              a file.
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81              Implies -m.
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EXAMPLES

85       Visualize audio levels on DAHDI channel 2:
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87         dahdi_monitor 2 -v
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90       Record channel 3 to a file:
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92         dahdi_monitor 3 -f output.raw
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94       This will create a raw PCM file (signed-linear, 8kHz, mono, 16 bits per
95       sample).  Both  the  Tx and Rx will be multiplexed in a single channel.
96       It can be converted to a WAV file using e.g.:
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98         sox -s -c1 -2 -r8000 output.raw output.wav
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101       Record Tx and Rx of channel 5 to separate files. This time directly  to
102       WAV files:
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104         dahdi_monitor 5 -r output_rx.wav -t output_tx.wav
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107       Record channel 8 to a stereo file (Tx and Rx on its two channels):
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109         dahdi_monitor 8 -s output.raw
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111       Converting it to a WAV file:
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113         sox -s -c2 -2 -r8000 output.raw output.wav
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SEE ALSO

119       dahdi_tool(8), dahdi_cfg(8).
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AUTHOR

123       This  manual  page  was written by Santiago Ruano Rincón <santiago@uni‐
124       cauca.edu.co> for the Debian system (but may be used by others).   Per‐
125       mission  is  granted  to  copy,  distribute and/or modify this document
126       under the terms of the GNU General Public License, Version 2 any  later
127       version published by the Free Software Foundation.
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131                                  9 Sep 2011                  DAHDI_MONITOR(8)