This file is indexed.

/etc/asterisk/muted.conf is in asterisk-config 1:13.18.3~dfsg-1ubuntu4.

This file is owned by root:root, with mode 0o640.

The actual contents of the file can be viewed below.

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#
# Sample muted configuration file
#
# Copyright (C) 2004 Digium, Inc.
#
# First you have the host, username, and password
# we use to connect to the asterisk system
#
# What is this? Well, haven't you ever wished you could automatically
# turn down the volume on your stereo, CDPlayer, etc, when a call comes in,
# and then return it to normal when the call ends? Well, this is a possible
# mechanism to make this happen!
# You have to fire up the new utils/muted, which runs as a daemon in the
# background. This daemon connects to asterisk via a manager interface, and
# also reads this config file from /etc/muted.conf. when the channels mentioned
# are activated, it tweaks the sound levels on the sound card(s).
# So, depending on the sound card, you may be able to run all your sound
# generating devices thru your sound card, and use this mechanism to quiet
# them down while you are on the phone. If anyone figures out how to make
# this work with kids, please inform!!
#
host localhost
user user
pass pass
#
# List each channel we're supposed to watch
#
channel DAHDI/1
channel DAHDI/2
channel SIP/mark
#
# Mute level is the percentage of the current volume we should
# lower the music to.
#
mutelevel 20
#
# Smooth fade makes the fadein/fadeout nicer sounding
#
smoothfade