The Care and Feeding of ISDN4BSD
3.2.4 isdntelctl	3.2 The Userland Components	3.2.6 isdnmonitor

3.2.5 isdndebug

Isdndebug is primarily used for debugging the isdn4bsd kernel parts. It allows to switch on or off classes of debugging kernel messages for the individual D-channel layers. Some statistics information from the protocol stack is also available by using this utility.