10-3 - Answer All units stop transmitting
10-4 - Answer Acknowledged
10-6 - Answer Busy stand-by unless urgent
10-7 - Answer Arrived or out of service
10-8 - Answer Departed or in service
10-9 - Answer Repeat last transmission
10-13 - Answer Unable to reply (relative near by etc)
10-19 - Answer Return to base
10-20 - Answer What is your location?
10-21 - Answer Phone by land line or cellular
10-25 - Answer non-violent psychiatric patient
10-26 - Answer Call cancelled
10-27 - Answer Hostage taking or swat stand by
10-50 - Answer Violent Psychiatric Patient
10-100 - Answer Bomb threat
10-200 - Answer Have Police Attend (often abbreviated to 10-2's)
10-2000 - Answer Send Police IMMEDIATELY