You can enable the Do Not Disturb (DND) mode to send all incoming calls directly to voicemail on the phone speakers and prevent the phone from ringing. The received calls are still logged into your Recent Calls list. If you have shared lines, DND will only disable the ringing. You’ll still see a visual call notification and be able to answer the call. Follow the steps below to enable the DND mode with the Polycom desk phone: Press the Home button to enter the home view. Select DND. By default, DND applies to all lines on your phone. If you want to enable/disable the DND mode only for a specific line, use the up and down arrow keys to select the correct line and press DND.