RE: River Song's Post TU Telephone Network (PBX)
Just catching up here. Just acquired a Raspberry and some books so starting reading up now.
WiFi repeaters can be powered by a very small solar panel setup, like most things most of them at 5V where it counts. I would guess that a complete set up, including repeaters could be spread over a reasonable area plus if managed by more than on Raspberry they could handle video and be encrypted between the raspberries removing the hub from being a way of tapping all calls.
Skean Dhude
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It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is the most adaptable to change. - Charles Darwin
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