[Scan-DC] DC Fire/EMS--How are Talkgroups Used?

[David Schoenberger]

I have another question about DC Fire/EMS, specifically about how the
EMS side uses talkgroups.  As I understand it, all dispatches (both
Fire and EMS) go out on TG 1616.  If it's a routine Fire-only
incident, TG 1632 is used.  If it's an EMS-only incident, the medics
seem to switch to TG 1904, 1920, or 1936.

How is it determined which TG the medic uses?  I thought at one time I
saw something about East/West, but I'm not sure if that was accurate.

Thanks,
Dave