Before GRN paging came in, all EMA brigades had a staion number and then used the appropriate appliance code, eg 491 = Coro 24P
Then when GRN came in they put zones in to split up brigade areas, so if they put in say Acklands Hill rd, Coromandel Valley it would come up as zone 49## (can't remember your exact number) they then hit enter and it tells them what should be sent in numbers and they hit send and off it goes, they oftem have no idea who you are, just your number. I have sometimes rung in and a new guy has answered, and you say your brigade name and they go "who?" then say your code and they go, "oh, thanks"
The confusion lies where they took the old EMA station numbers and added some numbers onto the end, because they were already there, then with some of these country brigades they just made up random numbers, they mean nothing in regards to station numbers and appliance types. Eg 2919 is just coincidence, before GRN Burnside were 299, then you look at Seaford who are 8334, before GRN they were 831.
See what I mean, if not PM me and I will try to make it clearer,
FWUUUU, I need a beer after that!!!