103
Medical emergencies (ambulance).
101
Fire and rescue services.
102
Police emergency number.
“Situation under control”
The situation is resolved or stabilized.
“All units”
Alerting all available units to a situation.
“10-4”
Message received and understood (influenced by international radio codes).
“Urgent”
The situation requires immediate attention.
“ETA”
Estimated time of arrival.
“Backup”
Request for additional police units.
“Negative”
No or disagreement.