3CX is a proprietary software-based IP PBX that works with Windows, Linux, and macOS. It is a software-based PBX that turns a computer into a fully functional PBX system. 3CX can be used to connect to other 3CX systems, SIP trunks, and PSTN lines. It can also be used to set up call queues, auto attendants, and other advanced call handling features.
3CX is a popular choice for businesses of all sizes because it is affordable, easy to use, and feature-rich. 3CX is also a very stable and reliable system, making it a good choice for businesses that rely on their phone system for critical communications.