I work at the emergency line in Catalonia. It works the same (more or less) for every country in the EU, and at my work I notice that many people are not completely aware of how the line works, so if you've got any questions I'll try to answer them.
A couple fun facts: more than half the phone calls do not result in warning any agency (meaning health services, police or firefighters). From those, roughly 70% are from phones that call "on its own" (quick dial number, or *******
Lots of kids joking around. Sometimes fun, sometimes they make you think that they are stopping real emergencies from coming through. Some jokes are really good though.
PS: ignore URL, it's just for the thumbnail.
TL;DR: ask questions about the 112 or whatever the emergency number is in your country.