| Code | Meaning |
|---|---|
| Affirmative | Yes or message understood. |
| Negative | No or unable to comply. |
| ETA | Estimated time of arrival. |
| Unit responding | Officers are on their way to the scene. |
| Backup requested | Additional assistance is needed at the scene. |
| All units | Alerting all available officers to a situation. |
| Priority call | An emergency situation requiring immediate response. |