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... whether a BOS building radio system is necessary or not. If a building radio system is required, the entire building must be covered. Partial coverage of only some parts of the building is not permitted. Special attention to good radio coverage applies to all escape routes, such as corridors, stairwells, passages, escape tunnels, access points, emergency exits, and approach and assembly areas for emergency services. For operational tactical reasons, different system configurations may be requested by the requesting parties (primarily fire departments).