With Dartmouth's phone system, you can use the web portal to change the configuration on your desk phone and/or your software-based phone.
To access the web portal log into dartmouth.zoom.us with your NetID and password.
Click Phone in the left column, then the Settings tab. See https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0069132 for information on what you can change from this tab.