LG L1150 - Manual (Page 39)

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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 and then selecting Active call
menu of End call.
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 select Reject call.
Muting the Microphone
You can mute the microphone during a call by pressing the [Menu] soft
key then selecting Mute or right soft key [Mute]. The handset can be
unmuted by pressing the Unmute menu or right soft key [Unmute].
When the handset is muted, the caller cannot hear you, but you can still
hear them.