All 9-1-1 centers have "7-digit emergency numbers" that alarm companies, OnStar, etc. call to report emergencies and incidents. These are the numbers that you want for a 9-1-1 outage. Depending upon where you live, you might have one, two, or three 9-1-1 centers that dispatch your area. For example, where I live, the local 9-1-1 center dispatches police only, a "regional" center dispatches fire and EMS. Generally these numbers are published in the local phone directory (remember those?), and sometimes on agency web sites. If in doubt, call the local agency on their business line and ask.