North Bay dispatches all of NE Ontario (major centres are North Bay, Sudbury, Sault Ste Marie & Timmins). There are towers located throughout the area (see Bell FleetNet Zone 3 for tower locations and frequencies). Dispatch is connected to the system using T1 lines and the towers are connected using a combination of T1 lines and microwave hops. You're hearing the dispatcher from North Bay transmitting off the tower you're scanning. In theory, you could dispatch from anywhere in the world. You will only hear a transmission if there is a mobile unit (cruiser) affiliated to the tower you're scanning and with its radio on the talkgroup you are monitoring.