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It depends on how the VOIP was setup. I worked for a telecommunications company for a while and they had equipment in AT&T's Central Offices that basically had POTS on one side and network on the other. Technically they had a VOIP system, but the last mile would be run over AT&T's copper lines. When the customer's power would go out, their phone would still work. BJ On Fri, 2012-08-17 at 11:39 -0400, David McFarlane wrote: > At 8/17/2012 11:26 AM Friday, Troy D Murray wrote: > > * The phones were VoIP, so those would function for 1 hour on > > some backup system before they'd go off-line (I didn't understand > > this and they didn't elaborate). > Just a guess, doesn't VOIP require internet and a working power > supply? By contrast, POTS (analog) supplies power from its own separate grid. > > -- dkm