Notably, this is only guaranteed by law to work as of 2020 - see Kari's Law: https://www.911.gov/issues/legislation-and-policy/kari-s-law-and-ray-baum-s-act/ ht

Notably, this is only guaranteed by law to work as of 2020 - see Kari's Law: https://www.911.gov/issues/legislation-and-policy/kari-s-law-and-ray-baum-s-act/ https://www.911.gov/issues/legislation-and-policy/kari-s-law... It is, unfortunately, one of those rules that's written in blood. Before that, on some systems you'd have to dial 9 to get outside, and then "911" again, so "9911".