LG 4015 - Manual (Page 37)

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In-Call Menu
If Call Waiting is on, you can put the first call on hold and answer the
second, by pressing
. You can end the current call and answer the
waiting call by pressing the left soft key [Options] and then selecting
Active call in the End call submenu.
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 right soft key
and selecting Reject call.
Muting the Microphone
You can mute the microphone during a call by pressing the right soft key
Mute or going to the [Options] then selecting Mute. The handset can be
unmuted by selecting by pressing the right soft key [Unmute] or choosing
Unmute in the [Options].