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Literature

- /usr/src/linux/Documentation/isdn/*
- /usr/src/isdn4k-utils-1.3.97/README and more files
- man pppd, isdnctrl, ...
- Kernel-HOWTO, PPP-HOWTO
- the lots of READMEs of the ISDN4Linux package
- Olaf Kirch: Linux - Wegweiser für Netzwerker; O'Reilly/International Thomson Verlag 1996; ISBN 3-930673-18-5
  (Originally in English: "The Linux Network Administrator's Guide")
- S. Hetze, D. Hohndel, M. Müller, O. Kirch: Linux Anwenderhandbuch; LunetIX Softfair 1995; ISBN 3-929764-04-0 (in German only)

The last named two books you should have!