User's Manual
Avaya B179 SIP Conference Phone Installation and Administration Guide
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Select INTERNAL MIC and press OK to switch between on (shaded box) and o.
To ensure maximum audio quality, do not use the internal microphone and external
microphones connected via the PA box at the same time.
Only the internal microphone is turned o. Any external microphones connected to the
Avaya B179 are still turned on.
Select INTERNAL SPKR and press OK to switch between on (shaded box) and o.
To ensure maximum audio quality, do not use the internal speakers and external speakers
connected via the PA box at the same time.
Adjusting microphone volume from PA
During a call, select > PA > PA MONITOR.
Adjust the microphone volume from the mixer so that the level on the display screen is
around 10–12 when speaking in a normal tone.
Adjusting PA calibration manually
It is possible to calibrate the duplex performance of the conference phone when it is con-
nected to a PA system. The calibration level can be set automatically by the Avaya B179 or
adjusted manually to any value between 0 and 5 (0 being full duplex).
• Increase the calibration if the other party experiences disturbing echo.
• Decrease the calibration if the other party experiences low duplex, i.e. your voice is muted
or clipped when the other party is speaking.
The position of the PA system’s microphones and speakers and the amplier’s settings
may aect full duplex performance.
Select > PA > CALIBRATION.
NB. You must ask the person you are calling to assess the eect of the adjustments you
make.
AUTO is the default setting. The gure shown in brackets is the measured calibration
value.
Select dierent levels and compare the audio quality to achieve your preferred setting.