Expansion with two variable ISDN ports (external/internal). When used internally, you can choose between the operating modes S0 (4-wire) or UP0 (2-wire). The internal ISDN ports can connect system phones from the COMfortel family or other ISDN devices.

2 ISDN ports, switchable external (S0) – internal (S0/UP0). Internally selectable as S0 (4-wire) or UP0 port (2-wire), multi-device connection, Euro-ISDN (DSS1). System phone functions in conjunction with COMfortel 1200, 1400, 1600, and 2600.

With the COMpact 2BRI module, the COMpact 5000 and COMpact 5000R are expanded by two switchable ISDN ports. Both ports can be configured as external or internal ISDN ports. In internal mode, you can choose between S0 (4-wire) and UP0 (2-wire). The internal ports can operate ISDN system phones from the COMfortel series and standard ISDN terminal devices.