TANDBERG 880 MXP - Manual (Page 65)

General Use
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3.8.3 Do Not Disturb
To prevent the system from accepting any incoming calls, activate the Do Not Disturb function.
The caller will hear a busy tone when calling the system. The monitor will be black when Do Not
Disturb is active, see figure below. This is useful when using the display for a presentation as
a local PC monitor and you do not wish any incoming calls during the presentation.
End Do Not Disturb by pressing any key on the remote control.