In order to resolve some performance related issues with using the older MOH conf file format, we update the syntax of the file to the newer format, per the instuctions on the asterisk wiki (http://www.voip-info.org/
We are running version 1.2.12.1 and have installed the asterisk-addons. Here are the before and after configs.
Old musiconhold.conf
; Music on hold class definitions
[classes]
default => mp3:/var/lib/asterisk/mohm
loud => mp3:/var/lib/asterisk/mohm
random => quietmp3:/var/lib/asterisk
New musiconhold.conf
; Music on hold class definitions
[default]
mode=files
directory=/var/lib/asteris
random=yes
[raw]
mode=files
directory=/var/lib/asteris
random=yes
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The reason the volume is different is that the new system plays the volume at the actual volume of the source music file. The old system used a separate program to playback which supported varying the volume level and since it was for background music the default volume was lower than maximum.
The sound format wont make a significant difference to the volume level. Ideally you should create the music in all formats the phone system is likly to support so that it will have to do the minimum abount of converting which takes CPU usage. Therefore :-
wav - for any external telephone interfaces
ulaw/alaw (G711) - for commonly used voip connections
gsm - for low bandwidth voip connection which are using that codec
There are lots of possible codecs but that should cover most of them and any others you happen to use occasionally will be simple to convert from wav on the fly.
Thanks for the info.
A little while ago I received a response from the trouble ticket I opened with Digium and they confirmed that using sox to adjust the volume is what I need to do. Response from Digium: "Currently there is no way to adjust the gains for native music on hold. The only work around is to redo the files with “sox”."
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by: grbladesPosted on 2006-11-10 at 02:25:43ID: 17913087
The only way to reduce the playback volume is to reduce the volume of the audio files during the conversion process. If you use the SOX program you can specify the -v option to reduce the volume. For example :-
sox -v 0.5 file.mp3 file.wav