Configuration 3.374Warning volumeSet the volume of the 2N® Helios IP signal tones that announce status changes.Key beep volumeSet the volume of the tone generated whenever a key is pushed.Lock open volumeSet the volume of the unlocking signalling tone.Call tonesSet the volume of the dialling, ringing and busy tones if generated by 2N® Helios IP.RingingSet the volume of the incoming call signalling tone – ringing tone. Incoming callsare signalled when the automatic incoming call receiving function is off, see theMiscellaneous subsection.Microphone SettingsSensitivitySet the microphone sensitivity.AGC (Automatic Gain Control)Set whether the Automatic Gain Control function should be used.Noise reductionSet the mode for noise reduction arising primarily during echo cancellation.VideoThis menu is used to set the video camera. To set the codec properties use theAdvanced Settings –> Video codecs menu, see the Video Codecs subsection.BrightnessSet the intensity of the video camera stream.Colour saturationSet the colour saturation of the video camera stream.Flip horizontallySet whether the picture is to be flipped horizontally.Frame rate decreasingEnable an automatic decreasing of the frame rate under poor light conditions,which improves the video quality to the detriment of the frame rate.Flicker avoidanceHere you can eliminate flicker caused by artificial sources of light such as fluorescentlamps. The flicker frequency depends on the light source power supply frequency.