This error usually happens when there are no MOH sound files uploaded or when default 'silence' file is not deleted.
- Login to the system administration
- Navigate to 'System: Music On Hold'
- Delete 'Default sound' file if one exists
- Upload new MOH file if there are no files uploaded yet and assign the file to 'default' MOH class
- Restart the system by clicking on the 'Restart' button
Now each call placed on hold will play all of the sound files located under the 'default' MOH class
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