isdn4k-utils is a collection of various ISDN related utilities. This package contains configuration tools for all ISDN adapters, supported by Linux. Furthermore, several status-monitors are provided as well as some ISDN-based applications. Namely ipppd, a PPP daemon for synchronous PPP over ISDN; vbox, an answering-machine and (for use with AVM-B1 only) capifax, a faxmachine.