A busy signal also may be received when all PBX trunk circuits are in use or internal switch network resources are not available. The PBX station user cannot control the availability of the called ...

PBX private networking has evolved dramatically during the past 25 years. The earliest PBX networking arrangements consisted of two switch nodes linked by a dedicated, private line facility, such as ...

A PBX is made up of hardware and software that connects to communication devices such as telephone adapters, hubs, switches, routers, and telephone sets. Modern PBXs have several management ...