If you are referring to TG 7088- this is the channel used by the dispatcher to activate the station alerting (Zetron system) speakers and lights. Then you will hear the alert tones and dispatcher put out the call.
Supposedly, the alert tone & voice dispatch is always simulcast on Fire-1, however I have found this is not always true. If you can put up with the data bursts (ducks quacking) being sent from dispatch to the stations and the response from the station back to dispatch, you won't miss a call.