The Do Not Disturb (DND) button present on all IP Phones allows users to avoid calls ringing on your phone when you are busy. Traditionally it stops the phone ringing and gives the caller a busy tone.
Now in v14 SP1, the DND button toggles your status to Do Not Disturb, which users can customize according to their preference and colleagues can see their status in the presence screen. Previously, it would just set your status to DND, without changing your status, which meant that callers will receive a busy tone, but other colleagues will not be informed of your new status and any rules configured for that status in 3CX would not be triggered.
The new behavior makes the DND button much more useful and makes it much easier to change your status in 3CX. With this new function your deskphone communicates with the 3CX softphone and will react according to your 3CXPhone settings.
Previously when the DND button was chosen on the deskphone, the phone would send a busy tone to the caller.Once SP1 is installed and the phones are reprovisioned, when the DND button is pressed on the deskphone the user’s status will automatically change to Do Not Disturb status; giving the user many more forwarding rule options and publishes this presence update to all colleagues. Pressing the DND button again will change the status to Available.
By default, callers will go to voicemail once you press the DND button.