I live in a large city and listen to the police scanner sometimes. The back and forth seems very orderly considering there are thousands of police and crimes happening everywhere.
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In most places if someone speaks while the dispatcher is transmitting he or she will hear it in their headset, that way they will know if a unit needs their immediate attention. In the old days it was usually done via a leased phone line from the repeater to wherever the dispatch communication center is. Now a days it’s probably done via microwave backhaul, fiber or other out of band link.
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