Which IP PBX to choose for an office with 50 subscribers?

Question

Telephony

It is required to purchase IP handsets for workplaces and combine them with internal numbers, as well as the ability to connect the provider's trunk via the Internet to provide communication with the outside world.

Cloud PBXs are not interested. What equipment is needed to organize such a network and how to choose the right PBX so as not to overpay for the bells and whistles that are unlikely to be used in telephony for employee communication?

Answer 1

Take a server, not necessarily powerful (4 cores and 8 gigs of RAM for the eyes) and forward to Asterisk.