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It’s not the ISP’s responsibility to ensure the customers’ have adequate HA designs for their own systems.

No, but if you are providing voice and telephony services that connect to the public switching network, as CenturyLink does, you absolutely have certain reliability requirements for 911 calls being relayed to local answering points.

I await the results of all the inquiries into this to find out what took place here.

Edit: Oh and "But $ISP doesn't offer traditional phone service, they sell VoIP", is as of 2005 no longer a valid excuse for non-compliance: https://www.fcc.gov/document/commission-requires-interconnec...

This isn't an issue with servicing their direct clients to E911 services, it's cell phone access from various carriers that went out. It's still a bad thing, but not quite the same as what it looks like you're assuming.

No assumptions being made here, just stating matters of fact as to what requirements CTL has for transmitting 911 service, the E911 edit was implied to be supplemental.

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