Maybe sipek didn't enable echo cancellation by default. Just a guess. You can have a try pjsua, make sure to enable echo canceler at cmd params. It works well when I try my sipua DLL at windows XP/Vista. You may also take a look my customized code when I get a repository to put soure code. regards, Gang 2009/2/12 TanMeng-en <mengentan at hotmail.com>: > Hello, > > I download Sipek, which bases on PJSIP. I found big echo problem, while two > persons talk through microphone and speaker on laptop computer. The noise > makes communication imossible. Could anyone tell me how to resolve this > issue? Thanks. > > ________________________________ > MSN 9.0 ??????????25G????? ????? > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > >