Audio Settings for Devices in ICX-AlphaCom mode mode - version 6 and older

From Zenitel Wiki

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  • This article describes the Audio Settings for Zenitel IP devices in ICX-AlphaCom mode, running firmware version 6 or older.
  • For version 7 and later, see Audio Settings (Devices)


To configure audio settings select Advanced ICX-Alphacom > Audio from the menu

Audio Settings page

Note icon The menus and parameters displayed may vary depending on the station type (e.g. Compact, Industrial or Ex).

Item Description Range Default
Volume Override Level This setting determines the volume to be used in the station when receving audio and the Volume Override feature is activated, see Volume Override for more details. 0-8 7
Microphone Sensitivity/Line Input Level If used as a local PA panel, a setting in the 1 to 3 range will reduce the chance of acoustic feedback (howling) 0-7 4
Digital/Analog Mic Switch Switch from Digital to Analog Microphone based on settings    
Always Digital The digital mic is always active   Yes
Always Analog The analog mic is always active   No
Analog I/O Pin When I/O Pin is triggered, Analog Mic is used, when not Digital Mic is used   No
Analog I/O Pin Call End Analog Mic is switched On (Digital Off) by first I/O Pin trigger in call and used until call end.   No
Digital/Analog Mic Switch Pin Input/Output Pin for Digital/Analog Mic switching. This doesn't affect other I/O pin configured functionality. NOTE: Pin must be configured as Input. I/O 1-6 None
Mute speaker while analog mic Mute speaker while Analog Mic is used.   Disabled
Voice Engine Mode Use "HD-Audio" only on devices that handle high quality music streaming/playback, typically IP loudspeakers and Turbine kits used as PA interface.    
Voice Regular audio quality   Yes
HD-Audio Play audio in PCM L16/48kHz format   No
Volume Control Ch1 [Turbine Compact only] Audio Channel 1 Offset Gain (default routed to Amplifier/Speaker) -62..+24 dB 0
Volume Control Ch2 [in standard Turbine ch2 is same signal as ch1] Audio Channel 2 Offset Gain. (default routed to Line Out Amplifier) -62..+24 dB 0
Note icon This volume settings must be used with caution as incorrect settings may severely degrade the performance of the echo-cancelling algorithm.

PTT with internal route Enable this option to use DAK1 as M-key   Disabled
Force loudspeaker ringing Enabling this option will route the ringing sound out on the speaker, even if handset or headset is used   Disabled
Hardware AGC      
Disabled Hardware AGC not in use   Yes
Quiet Area Enables hardware AGC with parameters adjusted for use in quiet areas   No
Noisy Area Enables hardware AGC with parameters adjusted for use in noisy areas   No
Manual Control Enables hardware AGC where parameters can be customized   No
Hardware DRC Enables Dynamic Range Compression   Disabled
Automatic Gain Control (AGC) If speech level and environmental noise are very unstable it may be turned on   Disabled
AGC Speed selects different attack/release times. Lesser values means faster attack and slower release time 0-3 0
AGC Volume Range corresponds to -20 - 0 dBm 0-7 0
Audio Out Source Select which audio source to send to the loudspeaker output    
Voice Audio Play audio from VoIP signal   Yes
LineIn Idle Play audio from the Line In input when the station is in idle. During a call, play audio from the VoIP signal   No
LineIn Idle+GPIO-6 If input 6 is activated while the station is in idle, play audio from the Line In input. Else play audio from the VoIP signal   No
Audio Input Source Select which audio source to use as input source    
Normal Microphone Select this option when using an electetret microphone as audio source   Yes
Line In Select this option when using an external audio source with line level   No
Line Out Source Line out can play audio either from the VoIP signal or directly from the microphone input    
Audio Ch2 Play audio from the VoIP signal   Yes
Microphone before AEC The analog and digital microphone signal is sent to Line Out. The speaker signal is picked up by the microphone through the air, and also sent to the Line Out. There is no signal processing   No
Microphone after AEC Station is in Open Mode: The microphone signal is sent to Line Out. The speaker signal is picked up by the microphone through the air, and also sent to the Line Out. Echo canceling is not working, but Noise reduction works. Audio from mic should be heard all the time on Line Out, audio from other party should be heard only when PTT is pressed by other party.
Station is in Full Duplex Mode: The microphone signal is sent to Line Out.
Add number of "Mixer Channels Select the number of mixer channels when the station is used for audio mixing in the ICX-Alphacom MultiConference feature. Each mixer channel will register to the ICX-AlphaCom server with its own directory number 0-6 0
Automatic Volume Control (AVC) Check this box to automatically adjust the volume according to the background noise level   Enabled
AVC Debug Check the box to show adjusted total gain with offset adjust in parentheses on OLED display (for TCIS-4/TCIS-5/TCIS-6). Total gain is referenced to 0 dB as “standard maximum gain” (level 7), and volume override levels (level not supporting open-duplex voice) as positive gain values.   Disabled
AVC Advanced Check to open for more advanced AVC settings   Disabled
AVC Lower Threshold Threshold level for AVC start working -92 - 0dBm -45
AVC Upper Threshold Threshold level for AVC stop working -92 - 0dBm 0
AVC Attack Rate How fast gain is raised when ambient noise level is increasing 0 - 100 (0.1 - 10 dB/sec) 2
AVC Decay Rate How fast gain is reduced when ambient noise level is falling 0 - 100 (0.1 - 10 dB/sec) 10
AVC Hysteresis Required mic-signal change level before new gain adjusted. This is applied when change in gain directions 1 - 10dB 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 1 - 10dB 1
Far-End Audio Squelch Enable Audio Squelch on Far-End Signal (suppress audio on low signal levels)   Disabled
Squelch threshold Signal level below this theshold will be suppressed to silence -92 - 0dBm -60
Squelch Activate Delay Delay time with signal below threshold level before squelch is activated. Squelch is turned off again on first audio frame with level above threshold. This will implement a simple hysteresis hindering too rapid on/off with a signal changing around threshold 0 - 10,000ms 100