TANDBERG 6000 MXP - Manual (Page 57)

General Use
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3.8.3 Do Not Disturb
To prevent the system from accepting any incoming calls, the function Do Not Disturb has to be
activated. 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.
End Do Not Disturb by pressing any key on the remote control.