LevelOne VOI-7011 - Manual (Page 29)

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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
PSTN-Out Vol. Set the PSTN volume for you to hear
Handset Gain Set the volume send out to the other side’s
handset
Speaker Gain Set the volume send out to the other side’s
speaker
PSTN-In Gain Set the volume send out to the other side’s
handset.
Note
PSTN function is only available on VOI-7011