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: https://gekk.info/articles/ksuless.html Support my channel: https://patreon.com/cathoderaydude https://ko-fi.com/cathoderaydude