 Generally, calls for service relate to the fields of the police, fire department and emergency medical services.As it pertains to police work, when the call for service is broadcast over the radio, it is assigned to an officer who patrols the specific sector or beat within which the call for service originates.Once assigned, the officer must respond and issue some type of finality back to the dispatcher indicating the action taken in order to essentially 'finish' that particular call and prepare the patrol shift for the next call.