Hi! I can hear perfectly the other side, but my voice is metallic on the other side. With PJSUA "desktop windows edition" there is no problem with sound my CPU usage is on WinMo under 50% at all the time // config_site.h #define PJ_WIN32_WINCE 1 #include "config_site_sample.h" // PJMEDIA media_cfg.clock_rate = 8000; media_cfg.audio_frame_ptime = 40; media_cfg.ec_tail_len = 200; media_cfg.max_media_ports = 8; media_cfg.thread_cnt = 1; media_cfg.ec_options = PJMEDIA_ECHO_SIMPLE; part of the log: 22:50:21.019 strm0020B154 JB shrinking 1 frame(s), cur size=28 22:50:21.081 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.105 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.153 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.201 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.225 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.273 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.434 strm0020B154 JB shrinking 1 frame(s), cur size=28 22:50:21.466 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.514 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.562 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.585 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.633 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.678 strm0020B154 JB shrinking 1 frame(s), cur size=28 22:50:21.825 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.873 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.922 Master/sound Underflow, buf_cnt=0, will generate 1 frame 22:50:21.945 Master/sound Underflow, buf_cnt=0, will generate 1 frame bye, Attila -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20090707/f20b0342/attachment.html>