Netherlands. As far as I know the emergency services here are government run, so I guess they bought this for all of them at once.
In The Netherlands there are Veiligheidsregio's ("Safety regions", areas where the emergency services work together) which make changes to OSM to improve the routing for emergency services. For example, Veiligheidsregio Twente is quite active.
So they've built / bought a custom system based on OSM data?