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Automatic Volume Control AVC

From Zenitel Wiki

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Most Zenitel IP devices supports Automatic Volume Control (AVC). The AVC feature automatically adjusts the volume of the audio signal to compensate for ambient noise in an effort to make the audio signal better heard and understood above the noise. When enabled the loudspeaker volume is adjusted according to the ambient noise level. The AVC will perform better if the "Speaker Volume" is set to a fairly low level, as this will give the AVC a more dynamic range for adjustments. Note that the AVC adjustment is disabled while the speaker is playing audio. Adjustments are made in silent periods (min. 100 ms silence required).

Enabling the AVC feature

How to enable the AVC feature depends on the mode of operation.

IC-Edge mode

Log in to the Edge Controller, and navigate to Edge Controller > System Configuration > Call and Audio, and enable "AVC":

Enabling AVC in an Edge system



SIP mode

Log in to the Zenitel IP device, and navigate to SIP Configuration > Audio, and enable "Automatic Volume Control (AVC)":

Enabling AVC on a device in SIP mode



ICX-AlphaCom mode

Log in to the Zenitel IP device, and navigate to Advanced ICX-AlphaCom > Audio, and enable "Automatic Volume Control (AVC)":

Enabling AVC on a device in ICX-AlphaCom mode



AVC - Advanced configuration

To access the "AVC Advanced" configuration you first need to enable Advanced Configuration Mode for SIP or Edge. (Not required in ICX-AlphaCom mode).

Go to Audio settings, and enable AVC Advanced:

"AVC Advanced" settings



  • Automatic Volume Control (AVC): Check the box to enable automatic volume control. Volume is adjusted according to the ambient noise level. The AVC will perform better if the loudspeaker volume is set to a fairly low level, as this will give the AVC a more dynamic range for adjustments. Note that the AVC adjustment is disabled while the speaker is playing audio. Adjustments are made in silent periods (min. 100 ms silence required).
  • AVC Debug: Check the box to show current volume level on OLED display (applicable to TCIS-4, TCIx-5 and TCIx-6 stations)
  • AVC Advanced: Check to open for more advanced AVC settings
    • AVC Lower Threshold: Threshold level for AVC start working. Valid range: [-92..0] dBm0. Default is "-45".
    • AVC Upper Threshold: Threshold level for AVC stop working. Valid range: [-92..0] dBm0. Default is "0".
    • AVC Attack Rate: How fast gain is raised when ambient noise level is increasing. Valid range: [0..100] 1/10th db/sec ([0.1..10] dB/sec). Default is "2" (= 0.2 dB/sec). If you want the volume to change more quickly, change to a higher value. E.g. at a value 20 the change will be 2dB/sec.
    • AVC Decay Rate: How fast gain is reduced when ambient noise level is falling. Valid range: [0..100] 1/10th db/sec ([0.1..10] dB/sec). Default is "10" which means the volume will be reduced by 1dB/sec when ambient noise is not present.
    • AVC Hysteresis: Required mic-signal change level before new gain adjusted. This is applied when change in gain directions. Valid range: [1..10] db. Default is "3".
    • AVC Lockout Time: Time for successive frames after AVC lock, due to far-end avtive or optional high near-end signal, before commencing AVC adjustments. A negative sign locks AVC if signal above upper threshold. Valid range: [1..10] db. Default is "1".