echo-cancel.conf

 # ~/.config/pipewire/pipewire.conf.d/echo-cancel.conf

 context.modules = [

     # Echo cancellation
     {   name = libpipewire-module-echo-cancel
         args = {
             # Monitor mode: Instead of creating a virtual sink into which all
             # applications must play, in PipeWire the echo cancellation module can read
             # the audio that should be cancelled directly from the current fallback
             # audio output
             monitor.mode = true
             # The audio source / microphone wherein the echo should be cancelled is not
             # specified explicitly; the module follows the fallback audio source setting
             source.props = {
                 # Name and description of the virtual source where you get the audio
                 # without echoed speaker output
                 node.name = "source_ec"
                 node.description = "Echo-cancelled source"
             }
             aec.args = {
                 # Settings for the WebRTC echo cancellation engine
                 webrtc.gain_control = true
                 webrtc.extended_filter = false
                 # Other WebRTC echo cancellation settings which may or may not exist
                 # Documentation for the WebRTC echo cancellation library is difficult
                 # to find
                 #webrtc.analog_gain_control = false
                 #webrtc.digital_gain_control = true
                 #webrtc.experimental_agc = true
                 #webrtc.noise_suppression = true
             }
         }
     }
 ]