The Auerswald ETS 4308i ISDN PBX Reverse Engineering Project is a completely Open Source client software kit for the Auerswald ETS 4308i ISDN PBX. It aims to implement tools for using the LCR-feature of the PBX effectively, for changing the PBX's configuration, for reading out the phone call accounting, and for using the ISDN-D-channel-protocol of the PBX as input source or isdnlog.