As siblings have commented, 112 and 911 are in the GSM standard. On landlines, only 112 will work in most EU countries (and even that is an EU achievement; e.g. in Switzerland 112 is inconsistent)
A kid these days in most urban parts would tend to say "911 I have an emergency" while roleplaying because we hear it so much in popular culture.
911 has enough mindshare that it'd be silly to use it for anything else. And if you're not going to use it for anything, a redirect seems like a very productive way to park it.
