TWX: There are all sorts of other issues with IP telephony, so this is fairly low on my list. I'm much more worried about power outages taking down telecom closets and the switches needed to run the phones, so suddenly in a power outage one cannot call emergency services. a POTS line or an internal phone system that works like a POTS line where the entire building's phone system runs off of a single battery bank or generator reduces the number of points of failure and increases overall reliability. Copper ethernet is limited to 300' lengths, so one has to have telecom closets for local distribution, while regular telephones can go thousands of feet over copper, allowing all cables to run back to one central location in a building or campus.
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