Samsung OfficeServ DS-5012L - Background Music (BGM) Volume

Navigation Menus DS/ITP-5012L Phone User Guide
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2. Press the [▼Volume▲] buttons to set
the volume level, and press the [Enter]
button.
Background Music (BGM) Volume
There are 16 volume levels you can set for BGM volume when BGM is
set on your phone.
1. Press the [Menu] button and use the direction buttons to select
Æ [6. BGM]
Then, press the [Enter] button.
2. Press the [▼Volume▲] buttons to set
the volume, and press the [Enter]
button.