Very close to my understanding.... the last digit relates to the job types
Last number identifier and Crew type
No number Emergency
1 Emergency
2 Emergency
3 Emergency
4 Emergency
5 Student Paramedic crew (one senior paramedic student, one junior student)
6 Second Medical Transport Service crew from a station (one paramedic, one ATS officer)
7 Medical Transport Service (one paramedic, one ATS officer)
8 Ambulance Transport Service (Shift starting on the hour)
9 Ambulance Transport Service (Shift starting on the half hour)
40 Sporting standbys / Level 4 volunteer crews that cannot transport patients
88 Volunteer on call crew
( Thanks to Mattb's website
)