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Setting your InTeleSync phone extension or phone line to Do Not Disturb will send incoming calls directly to your voicemail (if activated), or tell the caller that you're unavailable.

Most phones will have a hard button for DND. On Yealinks it'll typically be on one of the soft keys along the bottom of the home screen. On Grandstreams it will be the hard Pause button or a soft key along the bottom of the home screen. 

To enable and disable (toggle) DND on your extension by dialing star codes, they are *66*1 to enable and *66*2 to disable.