DND stands for Do Not Disturb. DND is a status in which all available lines are marked as “busy”. This forces your voicemail to answer all incoming calls. If your provider offers different voicemail greetings for busy and unanswered calls, DND will play the busy greeting. Nextiva also provides an option to have your phone remind you when a call comes in. Your phone will chirp (a single tone), when a call comes in. This will help you turn off DND when you’re ready to take calls again.