Within the Zoom phone system, there are many options for routing incoming calls. These range from:
You can set a single number to ring on another line without needing to request assistance from IT staff. See https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0069180#h_01F47RXN8EGCEY1XGXN5WDSKQT.
You will need to work with an ITC staff person to set up a shared line group, auto receptionist or call queue. Request a consultation for this at https://services.dartmouth.edu/TDClient/1806/Portal/Requests/ServiceDet?ID=30465.