I cant make it work please have a look. [root at example pjsua]# ./main --id sip:2000 at 78.23.84.212 --registrar sip:78.23.84.212 --realm 78.23.84.212 --username 2000 --password secret 21:18:47.181 os_core_unix.c pjlib 1.6-trunk for POSIX initialized 21:18:47.183 sip_endpoint.c Creating endpoint instance... 21:18:47.183 pjlib select() I/O Queue created (0x9bc51c0) 21:18:47.183 sip_endpoint.c Module "mod-msg-print" registered 21:18:47.184 sip_transport. Transport manager created. 21:18:47.184 sip_endpoint.c Module "mod-pjsua-log" registered 21:18:47.184 sip_endpoint.c Module "mod-tsx-layer" registered 21:18:47.184 sip_endpoint.c Module "mod-stateful-util" registered 21:18:47.184 sip_endpoint.c Module "mod-ua" registered 21:18:47.184 sip_endpoint.c Module "mod-100rel" registered 21:18:47.184 sip_endpoint.c Module "mod-pjsua" registered Segmentation fault (core dumped) [root at example pjsua]# Thank you Regards