User's Manual

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Set the callback key through the web interface:
Log in the phone page, enter the [Function Key] >> [Side Key] or [Function
Key] >> [Function Key] page, select the function Key, set the type as the function
Key, and set the subtype as the callback, as shown in the figure:
Picture 26 - Set the callback key on the web page
9.8 Mute
You can turn on mute mode during a call and turn off the microphone so that the local
voice is not heard. Normally, mute mode is automatically turned off at the end of a call.
You can also turn on mute on any screen (such as the free screen) and mute the
ringtone automatically when there is an incoming call.
Mute mode can be turned on in all call modes (handles, headphones or hands-free).
9.8.1 Mute the Call
 During the conversation, press the mute button on the phone: the mute button
on the phone will turn on the red light.
Red mute icon is displayed in the call interface, as shown in the figure: