Thank Russell for your fast reply, I use Baresip. As you can check in the following link, Baresip uses the EC module of Pulseaudio https://github.com/alfredh/baresip/wiki/Using-PulseAudio:-module-echo-cancel Do you know any other good VoIP client for linux with a low CPU consumption and Echo Canceller inside ? And what do you think about the error i get ? Thank you very much in advance ________________________________ De: pulseaudio-discuss <pulseaudio-discuss-bounces at lists.freedesktop.org> en nombre de Dferop Aero <Dferop_Aero at hotmail.es> Enviado: lunes, 11 de junio de 2018 16:43 Para: pulseaudio-discuss at lists.freedesktop.org Asunto: [pulseaudio-discuss] Error using with Echo Cancellation Module with VoIP Hello, I have always the same error when i use the Echo Cancellation Module. I get the same error all the time: May 31 09:30:54 localhost pulseaudio[753]: [alsa-source-CDC PCM Codec-0] module-echo-cancel.c: Playback after capture (-87178), drop sink 1414 May 31 09:30:55 localhost pulseaudio[753]: [alsa-source-CDC PCM Codec-0] module-echo-cancel.c: Playback after capture (-87698), drop sink 1422 May 31 09:30:56 localhost pulseaudio[753]: [alsa-source-CDC PCM Codec-0] module-echo-cancel.c: Playback after capture (-87148), drop sink 1414 May 31 09:30:57 localhost pulseaudio[753]: [alsa-source-CDC PCM Codec-0] module-echo-cancel.c: Playback after capture (-87279), drop sink 1416 It doesn't matter if i change the configuration parameters, i always get the same error. I thouhgt it was a problem of CPU (A20 dual core 950MHz, performance) so i have one isolated core running only Pulseaudio. In this case, the CPU consumption is only 20%, so now i don't think it is a problem of CPU As I said, It doesn't matter if i change the configuration parameters, i always get the same error... "drop sink 14xx" (more or less) I use tsched=0 in default.pa, if i set tsched=1 the error increases For the rest of parameters, same error. I have checked it with webrtc, adrian and speex. Besides I have set different values for the buffer (size and mseconds) in daemon.conf Because of this error, it seems that the audio is not fluid, the audio is choppy I hope you can help me, Thank you very much in advance, Paul -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20180611/62578f52/attachment-0001.html>