LG KE820 User Manual page 194

A tone sounds in the earpiece, and the display will show that a second call is waiting.
This feature, known as Call Waiting, is only available if your network supports it. For
details of how to activate and deactivate it see Call Waiting (Menu 9.6.4, see p. 1 13)
If Call Waiting is on, you can put the first call on hold and answer the second, by
pressing .
Rejecting an Incoming Call
You can reject an incoming call without answering by simply pressing the key.
During a call, you can reject an incoming call by pressing the key.
Muting the Microphone
You can mute the microphone during a call by pressing the [Options] key then
selecting [Mute]. The handset can be unmuted by pressing the [Unmute]. When the
handset is muted, the caller cannot hear you, but you can still hear them.
DTMF tones while calling
To switch on DTMF tones while calling (e.g. to use the phone with an automatic
switchboard) press the key [Options] followed by Send DTMF – DTMF on. Select
DTMF off to disable DTMF tones. DTMF tones are normally on.
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