DAHDI_MONITOR(8)DAHDI_MONITOR(8)NAMEdahdi_monitor - checks the Rx/Tx levels of a DAHDI channels
SYNOPSISdahdi_monitor num [-v[v]] dahdi_monitor num [-o] [<-f|-F> FILE]
dahdi_monitor num [[<-r|-R> FILE]] [[<-t|-T> FILE]]
DESCRIPTIONdahdi_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 ter‐
minal.
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 moni‐
tor.
-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 dis‐
played.
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 can‐
celer 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 ALSOdahdi_tool(8), dahdi_cfg(8).
AUTHOR
This manual page was written by Santiago Ruano Rincón <santiago@uni‐
cauca.edu.co> for the Debian system (but may be used by others). Per‐
mission 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)
