That Notifier voice-evac system reminds me of the ones they have recently been installing in some schools in my city that were renovated since 2008, but only one has the classic speaker/strobes (and Spectra Advance remote strobes), in the middle school my parents went to. The other two (soon probably four) schools use the SpectrAlert Advance speaker/strobes.
The panel was probably one of those Notifier ONYX NFS-3030 voice-evacuation systems, which these schools use (or will use for one of them).
Those wiffle-ball smokes on the 2098-9637 bases reminds me EXACTLY of how the smoke detectors at the Community Bank in my city (except it has 2903+2901-9833 horn/lights as the alarms) and I saw one just like that at the Brockton Day Nursery (TrueAlert horn/strobes). I am sure these two places I saw them also used the 2098-9636s like the one pictured (and the one I have).
Looks like it’s probably a Simplex 4002 system, judging by the types of signals and pulls used, but they may have since replaced it with a 4005 or something. That one detector above a drop ceiling obviously appears that the ceiling was replaced at one point; I’ve seen a few install jobs of heat sensors sticking out like that for the mentioned reason.