Landlines only work when there is no power if:
- you use an old school landline phone (not cordless)
- your landline is actually copper going to the house (I've seen fiber to house + conversion to twisted pair by a box with a battery)
- upstream infrastructure either still has (possibly battery) power
replyIf the isp doesn’t go down with the power outage you could probably get a big enough ups to keep the router and voip phone going for at least a couple of hours. Those things don’t use much power
replyI just setup a VOIP line at home and have it plugged into my UPS (along with my cable modem + network devices) to provide call service in the event of a power outage.
replyIn a big black out live we had in Spain the infrastructure all goes down. I was the only with data because i had star link and batteries in the house. Not that I could call anyone in Spain though.
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