With the gradual replacement of copper lines with broadband Internet, Internet Protocol (IP) PBXs are the most common systems used in enterprises. Although it is still possible to purchase analog systems, it is certainly not desirable as they are not expandable or upgradeable. They require adapters in order to work with VoIP or other digital hardware.
An IP PBX delivers voice calls over the Internet, otherwise known as VoIP. A premise-based IP PBX is a VoIP-based phone system that is housed within the office, also typically in a telecom closet. (It looks like a server with a bunch of wires.) Instead of physically connecting to the PBX with copper wiring, phones connect to the PBX over an office’s Local Area Network (LAN), often leveraging the same Internet connectivity that your office computers do.
Because they leverage the Internet, IP PBXs are capable of high definition audio and many other sophisticated PBX features, such as call queuing, flexible business hour rules, and application integration, interchanging with other unified communications and CRM platforms.