D-Link DCS‑6010L User Manual page 38

Section 4: Configuration
Audio in off:
Selecting this checkbox will mute incoming audio.
Audio in gain level:
This setting controls the amount of gain applied to
incoming audio to increase its volume.
Audio out off:
Selecting this checkbox will mute outgoing audio.
Audio out volume level:
This setting controls the amount of gain applied to
outgoing audio to increase its volume.
D-Link DCS-6010L User Manual 38