From my experience for a lot of these 911 centers they are centered around counties(not all, but a lot). Back when they were first being set up with the interne

From my experience for a lot of these 911 centers they are centered around counties(not all, but a lot). Back when they were first being set up with the internet capacity there were two issues. DSL was the only available service within the area, and the centers couldn’t afford large enough pipes. Talking early 2000s here. So a lot of these centers got pretty large grants from the feds. They then hired one of the companies at the time that were doing these upgrades in bulk around the country when the money was flying because the fcc wanted all of the emergency services to move to narrow band from wide band. These companies came in updated everything to modern and setup the contracts with the DSL providers back in the day(in my rural town I grew up in they just got 80mb cable internet in 2016, prior to that 10mb dsl was the best you could get there) In the west that was Qwest who became Century Link. But government being what it is. A lot of these 911 centers have languished because there is no desire to invest in updating these systems as they are expensive and hve a difficult upgrade process. So a lot of these centers are just paying to bills and trying to scrape by with minimal funding. And so upgrades and redundancy aren’t even considered. Until something like this happens. And the feds might throw some money at the problem. All the centers will get grants to have failover and then will go back into dormancy of just working day to day with no budget.