LevelOne VOI-7100 - Manual (Page 25)

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Volume
Raise or lower the sound level by using the Volume Control. For example, if it is
difficult to hear the other party's voice;
raise the Handset Volume, or If the other party has difficulty hearing you; raise
the Handset Gain level.
Handset Vol. Set the volume to hear from the handset
Speaker Vol. Set the volume to hear from the Speaker
Ringer Vol. Set the volume of ringer
Handset Gain
Set the volume send out to the other side‟s
handset
Speaker Gain S
et the volume send out to the other side‟s
speaker