To deactivate DND on the handset:
1. Check to the handset to see if it is on DND( this will be displayed differently depending on the make/model of handset)
1a.Snom: will display DND active on the display
1b. Yealink: will have a DND displayed on the upper part of the screen
1c. Polycom: DND on the side of the screen
2. Deactivate DND
2a. Snom: press the mute button will the handset is idle.
2b. Yealink: press the menu button, then features, then scroll down to DND and then disable DND
2c. Polycom: press the DND button.
To deactivate DND through the server:
1. Dial the *79 feature code from your handset.
1a. Snom: dial *79 followed by the tick button.
1b. Yealink: dial *79 followed by the ok button.
1c. Polycom: dial *79 followed by the dial button.