PBX(A private telephone network in an organization. Individual telephone numbers or extension numbers are supported, and calls are automatically routed to them. Users can call each other using extensions. They can also place calls to outside numbers); Nebenstellenanlage(A private telephone network in an organization. Individual telephone numbers or extension numbers are supported, and calls are automatically routed to them. Users can call each other using extensions. They can also place calls to outside numbers); Festnetztelefonanlage(A private telephone network in an organization. Individual telephone numbers or extension numbers are supported, and calls are automatically routed to them. Users can call each other using extensions. They can also place calls to outside numbers)
