Hi, list I am using the latest PJSIP(pjproject 0.7.0) on Windows Mobile 6 platform. It seems that there is a big delay (300ms-1sec) when talking from a softphone to another one. Although I tried these three points according to http://www.pjsip.org/trac/ticket/323, it has not improved. 1.change conference.c 2.disable ACE #define PJMEDIA_HAS_SPEEX_AEC 0 #define PJMEDIA_ECHO_SUPPRESS_FACTOR 1 3.change jitter buffer's parameters app_config.media_cfg.jb_max = 80; app_config.media_cfg.jb_init = 40; app_config.media_cfg.jb_min_pre = 20; app_config.media_cfg.jb_max_pre = 80; Test Environment: PDA1(PJSUA)--WLAN(11g)--WLANAP--openser | PDA2(PJSUA)----| PDA spec: CPU PXA270 416MHz Memory 64MB Do you have any idea about the problem? Regards, -- ????????? ???????? ???????? ???? Mail oota.yuuki at genetec.co.jp ?222-0033 ?????????3-23-3 ?????AK??2F ????????? ????????? TEL 045(476)1404(?) FAX 045(476)1416