I have some Forest Service information on the system from the late 80's and it wasn't called "Dispatch Net" in that info. It was called the "South Zone Dispatcher's Network" at that time. "Dispatch Net" would be an abbreviation and is probably used in some frequency guides. The name is important to differentiate it from the "North Zone" system. The Zones are now called "Geographical Area Coordination Centers" and in California as commonly known as "South Ops" and "North Ops" by agency personnel.