APCO 10-9: Repeat
In APCO, Association of Public-Safety Communications Officials 10-codes, 10-9 means "Repeat Message" or "Say Again".
APCO 10-8: In Service
In APCO, Association of Public-Safety Communications Officials 10-codes, 10-8 means "In Service" or "Available for Calls".
APCO 10-7: Out of Service
In APCO, Association of Public-Safety Communications Officials 10-codes, 10-7 means "Out of Service".
APCO 10-6: Busy
In APCO, Association of Public-Safety Communications Officials 10-codes, 10-6 means "Busy" or "Out of Service".
APCO 10-5: Relay Message
In APCO, Association of Public-Safety Communications Officials 10-codes, 10-5 means "Relay Message" or "Relay To".
APCO 10-4: Acknowledged
In APCO, Association of Public-Safety Communications Officials 10-codes, 10-4 means "Acknowledgment" or "Message Received".
APCO 10-3: Stop Transmitting
In APCO, Association of Public-Safety Communications Officials 10-codes, 10-3 typically means "Stop Transmitting" or "Cease Radio Traffic".
APCO 10-2: Signal Good
In APCO, Association of Public-Safety Communications Officials 10-codes, 10-2 typically means "Signal Good" or "Receiving Well".
APCO 10-1: Signal Weak
In APCO, Association of Public-Safety Communications Officials 10-codes, 10-1 typically means "Signal Weak" or "Receiving Poorly".
APCO 10-0: Caution
In APCO, Association of Public-Safety Communications Officials 10-codes, 10-0 typically indicates an "Officer In Trouble" or "Emergency Situation"