Echo cancellation on speaker phone

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I'm using pjsua for a SIP phone project, where laptops will act as 
speaker phones. I'm using pjproject 1.8.10, and I even if echo 
cancellation is enabled (as far as I know), the echo is annoying.

I'm not using the speex codex, so I guess the suppression is non optimal 
at the moment.  Is there any recent progress/improvements that can 
improve the quality of the acoustic suppression?

Jarle
-- 
Jarle Aase                      email: jgaa at jgaa.com
Author of Free Software.        http://www.jgaa.com

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