note 
•You can change the audio tone level during a call, intercom, room monitor or DirectLink.
•The Audio Tones feature can not be used while using speaker phone.
Audio Tones
The audio tone features provide three different tone levels. If you have difficulty
hearing a caller, press select/ 
/audio tone. The default setting, Natural Tone, is recommended for hearing aid users.
Mute Microphone
You can temporarily mute the microphone so that the caller cannot hear you.
1)Press menu/clear during talk mode (while the phone is in use) to mute the microphone.
2)Press 
/vol/∧ or 
/vol/∨ to move the pointer to Mute and then select/
/audio tone.
Mute On and ߦ appear in the display. To cancel muting, repeat above step again when Mute is set to on, Mute Off appears.
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