If your hardware is plugged into a UPS (including the VOIP adapter) I believe you can still make the 911 calls even in a power outage. The only problem being the possibility of your broadband connection going down due to the power outage. If this happens then yes, you'll need either a land line w/o a phone needing elctricity or a cell phone (depending of course how wide spread teh power outage is of course..) Still, depending where you live even a land line will not always work, for instance I live in Vermont and we have areas where trees fall due to winds or ice build up and take the lines out completely. Unfortunately (or fortunately depending on your view/values) there is not enough of a population to bury the wires. So anyway you go, IP, land line, cell, ther ewill always be a possibility of not being able to contact 911. I would think that having your VOIP hardware and your cable modem (most likely your phone also)on a UPS would give you decent 911 "uptime". If your REALLY worried I guess you could invest in a decent shortwave radio though:)
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If your hardware is plugged into a UPS (including the VOIP adapter) I believe you can still make the 911 calls even in a power outage. The only problem being the possibility of your broadband connection going down due to the power outage. If this happens then yes, you'll need either a land line w/o a phone needing elctricity or a cell phone (depending of course how wide spread teh power outage is of course..) Still, depending where you live even a land line will not always work, for instance I live in Vermont and we have areas where trees fall due to winds or ice build up and take the lines out completely. Unfortunately (or fortunately depending on your view/values) there is not enough of a population to bury the wires. So anyway you go, IP, land line, cell, ther ewill always be a possibility of not being able to contact 911. I would think that having your VOIP hardware and your cable modem (most likely your phone also)on a UPS would give you decent 911 "uptime". If your REALLY worried I guess you could invest in a decent shortwave radio though :)