If you don't want your Dartmouth phone to ring, you need to set your profile to "do not disturb" following the steps below:
When you're in "Do Not Disturb" mode, your presence indicator is red circle with a white dash in the middle.
Note: If you have your Dartmouth phone number on multiple devices (e.g .desk phone, computer and/or the cell phone) when you enable/disable "Do not disturb" on one device, it will propagate across all devices for that phone number.
The only thing that will interrupt a phone that is set to Do Not Disturb is an incoming broadcast (e.g. DartAlert).