/etc/isdn/isdnlog.users is in isdnlog 1:3.25+dfsg1-3.3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Generated by isdnlog 2.3.1 on Tue Apr 02 01:02:38 1996
#
###############################################################################
# File: /etc/isdn/isdnlog.users
# The empty section "world" means, that everybody from everywhere can connect
# to your isdnlog. Everybody gets all rights. Be careful with this section!
[world]
|