DU-COMM is the 911 emergency telephone service provided to a number of municipalities within DuPage County. DU-COMM provides fire and police dispatching directly for the City of Wheaton. DU-COMM is located in Glendale Heights. When you call 911, you are actually speaking with a dispatcher from DU-COMM. All fire alarms are directly transmitted to DU-COMM for dispatching the appropriate fire personnel.