Yes - but these are for like you said handie talkie urgents.
these are for borough dispatcher urgents:
8.6.1 Types of Urgent Radio Messages
A. Second or greater alarms
B. Calls for additional companies, ambulances, special units, or "10-75"
C. Dispatcher’s orders to units away from quarters to respond to alarms
D. Deployment of units or important messages to units at fire or emergency
operations
E. Report of apparatus breakdown while unit is responding to alarm
F. Transmission of alarms, and broadcast of address of fire
G. Report that unit has stopped to extinguish fire while responding to another alarm
H. Signal 10-70