Last nite I heard what I think was 792 going to Victoria which I think is part of the Western U health network in London.
I heard this all on 413.6875.
Back in the day a great deal of info was sent out on the air, you would hear the crew talking to the trauma centre, in my case at the time Sunnybrook or St. Mikes.
You will hear 792 on 413.6875 almost daily in the London area as they pop in and out of Vic and University Hospital. They routinely do patches to the hospital over this frequency as well.
FYI - London Health Sciences Victoria Campus is on Commissioners Road off Wellington towards the south end of London. This is the main trauma centre for our part of South Western Ontario. London Health Sciences University Campus is up at the North end of the City on the edge of the UWO campus. Patients routed to this facility are typically for cardiac or transplant type procedures.