$FreeBSD$
BEWARE: HIGHLY EXPERIMENTAL!
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This program is used in conjunction with a isdnd.rc entry similar to
regexpr = "ULPPP.*call active" # look for matches in log messages
regprog = i4brunppp # execute program when match is found
this one (see also i4brunppp-isdnd.rc).
i4brunppp _must_ be put into /etc/isdn!
When an active call is detected, isdnd fires off i4brunppp, which attaches
the rbch device used to stdin/stdout and then runs ppp which is given the
"-direct" command and the string "inc_rbchX" (where X is the i4brbch unit
number) as arguments.