Call signs (as of 9/9/21):
On County channels, ambulances add a "9" to the end of their call sign. 7M and Medic call signs presumably remain the same.
Details on unknown units can be found under "Private and Contracted Units" on this spreadsheet:
https://docs.google.com/spreadsheets/d/1zRhLAMAEASAfK6xJz06LZdaTztS-LP_EiTKPbWPYdRw/edit?usp=sharing
7M20 Unknown supervisor
7M40/740 Shift supervisor
7M80 Night shift supervisor?
7M160 Unknown
100 Rehab unit
401 Unknown
730 through 752 Ambulance
753 Critical Care Transport Team
753 through 759 Ambulance
760 Mobile Stroke Unit ("MSU-1" on County channels)
761 through 778 Ambulance
779 Lifted ambulance
780 Rochester Americans-themed ambulance
781 through 799 Ambulance
MCC-5 Mobile command center
Medic 1 ALS flycar
MCU-1 Mass casualty unit