In many cases, even primary carriers still have some level of disaster recovery. You need to ask your ITSP. Century Link, Windstream, AT&T and others all have disaster plans in anticipation of various issues to mitigate the impact, but you still have to ask the ITSP as this is your interface and then check around with others to see how they might handle it.
Of course, not knowing the details of your case, I assume it possible that there was nothing that could be done. However, if your ITSP has a center in NY and another in CA, the feeds from the upstream carrier may not be the same so that one may be down, the other not. Not much different than if the ITSP lost their center in NY and rolled to CA.