(scripts were executed with system() so e.g. IFS and PATH could be used to
work around any attempt of security...).
Now check that it is not installed setuid root (unless the user insists,
details in manpage), and recommend to put user in group `dialout' or similar
and also make the isdn devices group `dialout'; the scripts can then use
isdnctrl to stop/start stuff.
Paul Slootman