LG A7110 - Manual (Page 38)

36
In-Call Menu
Rejecting an Incoming Call
You can reject an incoming call without answering by simply pressing the
E key.
During a call, you can reject an incoming call by pressing the
E key.
Muting the Microphone
You can mute the microphone during a call by pressing the [Options] 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.