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Requires the purchase of IP handsets at workstations and combine them with internal numbers, as well as the ability to connect a trunk ISP over the Internet to ensure communication with the outside world.

I am not interested in cloud PBXs. What equipment do I need to organize such a network and how to choose the right PBX, so as not to overpay for gadgets that are unlikely to be used in telephony for employee communication?

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Take a small server, not necessarily powerful (4 cores and 8 gigabytes of RAM) and go to Asterisk.
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