Hi, I made several test with pjsua (on iphone) and clock-rate, stereo options. PJMEDIA_RESAMPLE_IMP == PJMEDIA_RESAMPLE_NONE PJMEDIA_RESAMPLE_IMP == PJMEDIA_RESAMPLE_LIBRESAMPLE --stereo | def | undef --clock-rate | 8000 | ko (2) | ok (1) 16000 | ok (1) | ok (1) 22050 | ok (1) | ok (1) 44100 | ok (1) | ok (1) (1) but mediaserverd uses cpu at 80-95% (2) there are no sound that comes micro, mediaserverd uses cpu at 10%, but crash/reboot when you quit pjsua (start, quit => crash) PJMEDIA_RESAMPLE_IMP == PJMEDIA_RESAMPLE_SPEEX impossible to compile because resample_speex.c is never include in Makefile PJMEDIA_RESAMPLE_IMP == PJMEDIA_RESAMPLE_LIBSAMPLERATE impossible to compile because libresamplerate doesn't exist in third party directory. Why do you keep PJMEDIA_RESAMPLE_SPEEX and PJMEDIA_RESAMPLE_LIBSAMPLERATE ? I'd like to use clock-rate=8000 and stereo, which test I can do to understand why there is no sound and there is crash ? I use the last svn version. Samuel