Cisco 7821 - Answer a Call; Answer Call Waiting; Mute Your Call

Answer a Call:
Procedure
When your phone rings, press the flashing line button to answer the call.
Answer Call Waiting:
When you are on an active call, you know that a call is waiting when you hear a single beep and
see the line button flash.
Procedure
Step 1
Press the line button.
Step 2
(Optional) If you have more than one call waiting, select an incoming call.
Mute Your Call:
While you are on a call, you can mute the audio, so that you can hear the other person, but
they cannot hear you.
If you have a video phone, when you mute your audio, your camera continues to transmit
video.
Procedure
Step 1
Press Mute .
Step 2
Press Mute again to turn mute off.