Speex dev - Jul 2006 - Echo Cancellation for silent echo signal

Hi Jean-Marc,
    I am developing a voice chat for win32 using speex,when I do echo
cancellation, after 2 seconds adaptation,the echo canceller work very well,but
after process silent(zero) echo signal(when enabled VAD,DTX),it work very bad,I
have to reset it, it seems adapt faster then do not rest it, so I always here
echo produce by my fisrt two second speech,how can I solve this problem? Thank
you very much. I am sorry for send this mail again.
 
                   Best regards

            Yong Chen
            admin@seeyoucn.com