=Daemon config file=
Edit /etc/pulse/daemon.conf
# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see .
## Configuration file for the PulseAudio daemon. See pulse-daemon.conf(5) for
## more information. Default values are commented out. Use either ; or # for
## commenting.
daemonize = yes
; fail = yes
allow-module-loading = no
allow-exit = no
use-pid-file = yes
system-instance = yes
; local-server-type = user
enable-shm = no
enable-memfd = no
; shm-size-bytes = 0 # setting this 0 will use the system-default, usually 64 MiB
; lock-memory = no
; cpu-limit = no
high-priority = yes
nice-level = -11
realtime-scheduling = no
; realtime-priority = 5
; exit-idle-time = 20
; scache-idle-time = 20
; dl-search-path = (depends on architecture)
; load-default-script-file = yes
; default-script-file = /etc/pulse/default.pa
; log-target = auto
; log-level = notice
; log-meta = no
; log-time = no
; log-backtrace = 0
resample-method = speex-float-0
; avoid-resampling = true
; enable-remixing = yes
; remixing-use-all-sink-channels = yes
; enable-lfe-remixing = no
; lfe-crossover-freq = 0
flat-volumes = no
; rlimit-fsize = -1
; rlimit-data = -1
; rlimit-stack = -1
; rlimit-core = -1
; rlimit-as = -1
; rlimit-rss = -1
; rlimit-nproc = -1
; rlimit-nofile = 256
; rlimit-memlock = -1
; rlimit-locks = -1
; rlimit-sigpending = -1
; rlimit-msgqueue = -1
; rlimit-nice = 31
; rlimit-rtprio = 9
; rlimit-rttime = 200000
default-sample-format = s16le
default-sample-rate = 48000
alternate-sample-rate = 48000
default-sample-channels = 1
; default-channel-map = front-left,front-right
default-fragments = 4
default-fragment-size-msec = 5
; enable-deferred-volume = yes
; deferred-volume-safety-margin-usec = 8000
; deferred-volume-extra-delay-usec = 0
=System Mode Config=
Edit /etc/pulse/system.pa
#!/usr/bin/pulseaudio -nF
#
# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see .
# This startup script is used only if PulseAudio is started in system
# mode.
### Automatically load driver modules depending on the hardware available
.ifexists module-udev-detect.so
load-module module-udev-detect tsched=0
.else
### Use the static hardware detection module (for systems that lack udev/hal support)
load-module module-detect
.endif
### Load several protocols
.ifexists module-esound-protocol-unix.so
load-module module-esound-protocol-unix
.endif
load-module module-native-protocol-unix
### Automatically restore the volume of streams and devices
load-module module-stream-restore
load-module module-device-restore
### Automatically restore the default sink/source when changed by the user
### during runtime
### NOTE: This should be loaded as early as possible so that subsequent modules
### that look up the default sink/source get the right value
load-module module-default-device-restore
### Automatically move streams to the default sink if the sink they are
### connected to dies, similar for sources
load-module module-rescue-streams
### Make sure we always have a sink around, even if it is a null sink.
load-module module-always-sink
### Automatically suspend sinks/sources that become idle for too long
load-module module-suspend-on-idle
### Enable positioned event sounds
load-module module-position-event-sounds
load-module module-echo-cancel use_master_format=1 aec_method=webrtc aec_args="analog_gain_control=0 digital_gain_control=1" source_name=echoCancel_source sink_name=echoCancel_sink
set-default-source echoCancel_source
set-default-sink echoCancel_sink
=Run & Test=
Login as root
Start PulseAudio at system mode
pulseaudio --system
Single Test
gst-launch-1.0 pulsesrc stream-properties="s,filter.want=echo-cancel" ! pulsesink stream-properties="s,filter.want=echo-cancel"
Two panels Test
gst-launch-1.0 pulsesrc stream-properties="s,filter.want=echo-cancel" ! audio/x-raw,rate=48000 ! opusenc bitrate=64000 ! rtpopuspay ! udpsink host=192.168.101.102 port=6004 sync=0 &
gst-launch-1.0 udpsrc port=6004 caps="application/x-rtp" ! rtpopusdepay ! opusdec ! pulsesink stream-properties="s,filter.want=echo-cancel" sync=0 &
gst-launch-1.0 pulsesrc stream-properties="s,filter.want=echo-cancel" ! audio/x-raw,rate=48000 ! opusenc bitrate=64000 ! rtpopuspay ! udpsink host=192.168.101.101 port=6004 sync=0 &
gst-launch-1.0 udpsrc port=6004 caps="application/x-rtp" ! rtpopusdepay ! opusdec ! pulsesink stream-properties="s,filter.want=echo-cancel" sync=0 &