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...nd I need to cancel echo. First I tried to make simple echo cancellation test application to test if my code will work. I make a call with two SIP phones (one with speakerphone). I dumped the RTP streams via wireshark and dumped it to the PCM 16 audio (8000 samples). 160 samples per 20ms and I used 640samples tail. I try this test data on the origin speex test echo cancellation application. The echo was cancelled but the stream was damaged (some of non echo parts was cancelled to) I try this with my own test application again, but that does not work. Then I find out why. When I try to call preproces...