Hello, We encounter a problem recently with the AEC abilitiy of pjmedia_snd_port. We found that in some low-end Android smartphone or pad, their hardware AEC ability did not function well. So we have to use the soft AEC canceler came with pjmedia to handle them instead. This works, but we soon find that if the the recorded wav samples had under gone a hardware AEC, the soft AEC would re-introduce some echo and made the audio quality downgrade. My question is : 1) If I can turn off the hardware AEC function from pjsip. The strm_set_cap function of android_jni_dev.c seems not to provide this function. 2) Or, if I can be informed that if the hardware AEC has been used? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20150811/548c5315/attachment.html>