This function is used to prevent the phone from disturbing. Go to
Setting-DND. if open DND, external phone call is unable to call in,
turned off by default.
①
By pressing this icon to enter the DND settings interface.
②Enable/Disable DND function.
③Enable/Disable the IVR(Interactive Voice Response).
④ Select valid time of DND. Users can also setup the accurate Start
and End time or enable the DND whole day.
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