The Do-Not-Disturb (DND) feature on the device will reject incoming calls (including call waiting).
Enable/Disable phone all lines DND, the methods as the following：
Phone interface: Default standby mode，
1) Press [DND] button to enter the DND setting interface, select line or phone to enable DND.
2) Press [DND] button to enter the DND setting interface and disable DND.
The DND icon will turn red when it is enable and the icon will show in the top right of the screen
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