Although most of our customers use our termination with smartphones and ATAs, some use it with Private Branch eXchanges (PBXs). PBX telephone systems support incoming calls from the outside copper-wire traditional phone system (PSTN), placing calls between users' phones (also known as extensions) and other phones or the outside PSTN, conferencing other users together, recording voicemails, and a variety of other advanced telecommunications functions. PBX systems are broadly divided into several categories: traditional (also known as legacy); converged (also known as hybrid) or pure IP, aka IP-PBX.
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