An undeveloped idea to follow, but it could work!
All "groups" (1 brigade at least) included in a 3 Alarm or higher incident, could be given "Advisory", "Alert/Active Standby", "Contained" and "Stop" message for information purposes only. This would make information flow pretty awesome, and would mean brigades would not have to self-monitor incidents.
E.g
IC calls a 3rd alarm, as part of that, SACAD could look at which brigades have gone, and then send a message to all the relevant group info addresses:
MFS: INFO ONLY: Escalating incident at Lenswood. Await further notifications.
MFS: CFSRES: Active Standby for Lenswood incident. Await further notifications.
MFS: INFO ONLY: Lenswood incident contained. Cancel Active Standby.
MFS: STOP MSG: Stop recieved for Lenswood Incident.