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.

The samples below should be sufficient to set up most PBXs in use today.