With the COMpact ISDN module, you can flexibly expand the COMpact 3000 analog, COMpact 3000 ISDN and COMpact 3000 VoIP with an ISDN exchange port or an internal ISDN port, which can even be used alternatively in the connection types S0 (4-wire) or UP0 (2-wire).

In conjunction with the alternative operating system Askozia®PBX, the COMpact ISDN module in the COMpact 3000 VoIP is also supported in all of the above-mentioned operating modes.