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A private branch exchange (PBX) is a telephone exchange for a business. A PBX system connects incoming telephone lines to a set of extensions inside a business. Basically, it is a phone system with extensions and auto attendant.

VOIP PBX or IP is a PBX system that can handle calls on an IP network. It supports outbound connection to a SIP trunk or regular trunk; it also supports IP extensions. Most VOIP services provide regular telephone numbers to allow calls from landline or cell phones. The person who calls these numbers usually cannot tell the difference whether the call is make to a VOIP service or traditional PSTN service.

POE stands for Power over Ethernet and allows POE enabled phones to be powered through your network if the network is POE capable.