WebRTC echo canceller!!!

[Puyol]

Hi all, 
I used PulseAudio with Gstreamer to make echo cancellation in my project.
The PulseAudio server use 3 echo canceller; WebRTC, SPEEX et ADrian. 
When i use pactl load-module module-echo-cancel aec_method=WebRTC it return 
Failure: Failed to initialize module. 
Did any one know the WebRTC AEC in PulseAudio work with which algorithm, and
what components uses, because SPEEX and Adrian AEC are are detailed, but
unfortunately WebRTC is not!! 
Thanks all



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