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Headset Operation on page 84
Headset Caller Volume
While talking via the headset, you can adjust the volume of the caller.
Procedure
1. Use the + plus and – minus keys to adjust the volume.
2. Once you stop adjusting the volume, the display returns to normal after a few seconds.
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Headset Operation on page 84
Automatic Gain Control
When using automatic gain control (AGC), the phone tries to maintain a constant audio level even
if the incoming call changes between loud and quiet.
Procedure
1. Press the
button. On 9621/9641 phones, select Settings.
2. Use the cursor keys to select Options & Settings.
3. Use the cursor keys to select Audio.
4. Use the cursor keys to select Automatic gain control.
5. Use the cursor keys to switch between Handset, Headset, or Speaker.
6. To change the highlighted setting, press Toggle.
7. When completed, press Save.
8. Press Back/Exit to exit the menus.
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Headset Operation on page 84
Default Handsfree Audio Path
By default, when you make a call or answer a call without lifting the handset, the audio is played
through the phone's speaker while you speak via the phone's microphone.
Headset Caller Volume
April 2020 9600 Series Phone User Guide 85
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