Grandstream Networks UCM6510 User Manual page 241

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Note:
In case the users have deleted the system MOH files, there are two ways to recover.
1. Users could download the MOH file from this link:
http://downloads.asterisk.org/pub/telephony/sounds/releases/asterisk-moh-opsound-wav-2.03.tar.gz
After downloading, unzip the pack and upload the music files to the UCM6510.
2. Factory reset could also recover the MOH file on the UCM.
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Firmware Version 1.0.10.39 UCM6510 IP PBX User Manual Page 240 of 339