Use Do Not Disturb
(DND) to silence your phone and ignore incoming call notifications when you
need to avoid distractions.
When you enable
DND, your incoming calls forward to another number, such as your voicemail, if
it is set up.
When DND is turned on, Do not disturb is displayed in the top bar of the phone screen.
When you enable DND, by default, it affects all lines on your phone. You can also enable DND on a specific line from the Preferences menu. However, you will always receive intercom and emergency calls, even when DND is turned on.