There are three types of PBX systems: on-premises, hosted, and cloud-based. On-premises systems are the traditional, most expensive option. They require a physical server to be installed and maintained on-site.
Receive PBX systems are less expensive and easier to manage, but they require a reliable Internet connection. Cloud-based PBX systems are the most affordable and easiest to manage, but they require a reliable Internet connection and can be subject to outages.
Image Source: Google
What is the difference between two- and four-wire systems?. A two-wire system is a basic telephone system, while a four-wire system is networked and can be connected to additional lines. A two-wire system provides only voice communication, while a four-wire system also facilitates data transmission.
What devices are included in a PBX?. The most important piece of equipment in a PBX is an encoder, which converts analog signals into digital signals for communicating over the Internet or other networks. Other commonly included devices include fax machines, voicemail servers, and voicemail attendants.
What is VoIP used for? VoIP can be used to make phone calls using a computer. It can also be used to make phone calls from a cell phone or other mobile device. VoIP can also be used to send and receive faxes, though not every VoIP service includes this functionality.
You can even search online for more information about Hosted PBX system.