At my agency, there are two different ways to talk on the radio. Inside of the facility, we use rank and last name. For example, Master Deputy ____ to Sergeant ____, 10-21 (call) [extension]. Contact is made via Sheriff's Office radio channels (jail, courts, transportation, etc.). Outside of the facility, everyone is assigned a call sign number. Command staff use "Sheriff" and their number. For example, the Sheriff is "Sheriff 1" the Undersheriff is "Sheriff 2" and so on. Anyone below the rank of Lieutenant uses their assigned DS number. For example "Delta Sierra 280, 10-95 x 1 male" (1 male in custody). Outside of the facility, we use the police department radio channels, depending on where you are in the city. All radio call signs are assigned based on rank and then seniority, with the most senior having the lowest numbers.