hi,all, please help me! I use pjproject-0.8.0, when i set audio_frame_ptime = 20,aec = 1, then PaRecorderCallback and PaPlayerCallback function run exactly, but aec can't work well, do not cancell echo . when i set audio_frame_ptime = 10,aec = 1, then aec can work well . but the PaRecorderCallback and PaPlayerCallback function do not work well, portaudio callback the PaRecorderCallback times far more callback PaPlayerCallback times, example In 500ms time, callback PaPlayerCallback 500 times, but callback PaRecorderCallback 600 times, it result the aec continue reset. i find underflow in the PaPlayerCallback. pls help me! thanks! --------------------------------- ???????????? -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080417/c1dd8dd5/attachment.html