Walkie Talkie "10 Codes" 10-1 = Receiving poorly. 10-2 = Receiving well. 10-3 = Stop transmitting. 10-4 = Message received. 10-5 = Relay message to ___ 10-6 = Busy, please stand by. 10-7 = Out of service, leaving the air. 10-8 = In service, subject to call. More items...