Occasionally, a Dartmouth number is blocked by the company that provides phone service to your home or personal cell phone. This happens when someone reports that number as spam, or they see lots of calls in a short period of time to a range of numbers from the same originating number. In order to fix this for your home phone, see the links below where you can report the inaccurate flag to your provider so they can correct it for you.
Verizon: https://voicespamfeedback.com/vsf/
AT&T/Wireless/Call Protect/HIYA: https://hiyahelp.zendesk.com/hc/en-us/articles/115014815387-I-want-to-change-or-remove-the-caller-ID-information-or-Spam-Rating-of-a-number
T-Mobile/FirstOrion/PrivacyStar: https://www.t-mobile.com/callreporting
Xfinity/Comcast: https://xfinityspamfeedback.com/xfinity/