This document describes the procedure to change the default Music On
Hold (MOH) volume level in Cisco CallManager. During the conversion of dropped
audio files, the Default MOH Volume Level parameter controls the volume level.
The maximum and minimum volume levels are 0 and -48 decibels (dB),
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In order to add an MOH audio source, you need a music file with good
quality. MP3 or Waveform Audio (WAV) are the preferred formats. Other formats
can cause problems, such as distorted music. The Cisco MOH Audio Translator
service converts audio source files into various coder-decoders so that the MOH
feature can use them. Cisco CallManager automatically installs this service
when you install the Cisco IP Voice Media Streaming application.
The MOH Audio Translator service automatically translates audio files
that you place in the input directory. The installation program creates the
directory C:\Cisco\DropMOHAudioSourceFilesHere during installation.
After MOH Audio Translator adds an audio file in the input directory,
this file is converted to five WAV files and an Extensible Markup Language
(XML) file. The files go in the directory
The suffixes for these files are:
For example, if the audio file is atest.wav, the converted files
See Figure 1.
Figure 1 – Converted Wav Files
When the Cisco MOH Audio Translator service converts audio source
files, the Default MOH Volume Level parameter specifies the MOH volume level in
Complete these steps to change this parameter:
Select Start > Programs > Cisco CallManager >
version number > CallManager Administration.
Click Service in the menu bar and select
See Figure 2.
Figure 2 – Selection of Service
Select the server name from the Server drop-down
See arrow A in Figure 3.
Figure 3 – Service Parameters Configuration :
Select Cisco MOH Audio Translator from the Service drop-down
See arrow B in Figure 3.
Click the Advanced button above the General
Locate Default MOH Volume Level under the Clusterwide Parameters
Set the volume level.
The default is -24 dB. The minimum and maximum are -48 and 0 dB
respectively. Changes to this parameter automatically take effect within 60
Changes to this parameter only affect audio files that are processed
after the change occurs.