With PBX Control you can retrieve information of your PBX and access functions quickly and simply as well at home as underway. Supported systems. COMpact 3000 analog/ISDN/VoIP. COMpact 50x0 VoIP. From firmwareversion 6. 6: COMpact 4000. COMpact 5000 COMpact 5200 COMpact 5500R. COMmander 6000-Serie. Features: Subscriber settings: switch call forwarding.