Hi, I am not sure if there are native build-in solutions - you need to check with your distribution vendor. Anyway, there are few third-party solutions out there. If you are in to building an AEC from open source projects then you might want to try [url=http://www.speex.org/]Speex[/url]. Alternatively you can buy a commercial solution like SoliCall's [url=http://www.solicall.com/products.html]Acoustic Echo Cancellation[/url].