Cathode Ray Dude - CRD | PBX Phones - Without a PBX? @CathodeRayDude | Uploaded November 2019 | Updated October 2024, 1 week ago.
These phones promise PBX-style features: intercom, paging, conferencing - without a PBX. How is that possible? A clever way to improve very old technology by applying even older technology!

More info on my research into these can be found here: gekk.info/articles/ksuless.html

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