This file is indexed.

/usr/share/isdn/default/isdnlog.DEVICE is in isdnlog 1:3.25+dfsg1-3.7ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# This is a very short summary with the important options.
# for a longer descriptions of all options : please read isdnlog(8)

# REMOVE the next line once configuration is complete #########################
# Warning! not configured yet!
# REMOVE the above line once configuration is complete ########################

[options]

#log=1 		# log d-channel messages. value may be 0-15 (bit coded flags)
daemon=yes	# "yes"/"no": (dont) start isdnlog as daemon. Set yes for Debian
stdout=0x3f7	# log to stdout and file, and set log level
 # if you remove "outfile" option, also remove "stdout" option!
outfile=+/var/log/isdn/isdnlog	# logfile to log to ('+' is append mode)
console=/dev/null	# where to send stdout text; e.g. /dev/tty12
#monitor=yes	# enable support for imon and imontty (monitor progs)
syslog=0x1bf7	# log to syslog with log level X
#thruput=60	# if you log thruput : one message every X seconds
#time=2		# 1=get time from isdn one, 2=everytime
#hangup=5:3	# enable chargehup with 5 / 3 seconds security gap
#start=yes	# enable program start on events
ciInterval=59   # show the cost etc. every 60s

# If you have the Deutsche Telekom cityweekend thing,
# enable the cityweekend option in isdn.conf.