Code 4
The situation is under control.
Code 5
Backup needed – additional units required.
Code 6
Ambulance required on-site.
Code 7
Fire brigade needed on-site.
Code 8
Dangerous situation or presence of hazardous materials.
Code 9
Hostage situation or major crisis.
Code 10
Request for additional intelligence or information.
Code 11
Request for permission to leave the area.
QAP
Stand by for further instructions.
QSL
Message received and understood.