Revolabs Fusion Microphone System — Tandberg C20 - Manual (Page 4)

Configuring the Tandberg C20 Video Codec
4. Select AUDIO
5. Select INPUT
6. Select AUDIO VOLUME and set to 70
* NOTE: Audio Volume is OUTPUT level only, not
INPUT LEVEL.
NOTE: You must use your Fusion remote control to control the room volume
for both the audio and video conference calls. Adjusting the volume in the
video codec will cause echo.