For the CP930 replacement please refer to the user guides for the Yealink CP935W.
You can use the Do Not Disturb mode to reject incoming calls automatically. Calls you receive while DND is enabled will be logged as missed calls.
To activate or deactivate DND do one of the following:
- Navigate to Menu>Features>DND.
The screen displays the incoming lines currently assigned to the phone.
Tap OK.
Select Enabled from the Status field to activate DND or select Disabled to deactivate it.
Select Save. - When the phone is idle press the DND soft key.
The status bar displays 
.