Hi pjsips, I got a call fail case. It seems has more chance to reproduce when stun server response slowly. But can not reproduce this every time under same network conditon. 09:20:26.232 pjsua_call.c .Incoming (null) 09:20:26.234 pjsua_media.c ..Call 0: initializing media.. 09:20:26.235 icetp00 ...Creating ICE stream transport with 2 component(s) 09:20:26.235 icetp00 ....Comp 1: srflx candidate starts Binding discovery 09:20:26.494 stuntp0x44026a !.STUN mapped address found/changed: 145.114.190.185:59907 09:20:33.216 icetp00 !....Comp 1: host candidate 192.168.0.4:47293added 09:20:33.217 icetp00 ....Comp 2: srflx candidate starts Binding discovery 09:20:33.228 icetp00 ....Comp 2: host candidate 192.168.0.4:56630added 09:20:33.230 icetp00 ....ICE stream transport created 09:20:33.230 icetp01 ...Creating ICE stream transport with 2 component(s) 09:20:33.231 icetp01 ....Comp 1: srflx candidate starts Binding discovery 09:20:33.234 icetp00 !.Comp 1: Binding discovery complete, srflx address is 145.114.190.185:59907 09:20:33.475 stuntp0x440293 .STUN mapped address found/changed: 145.114.190.185:62147 09:20:33.480 icetp00 .Comp 2: Binding discovery complete, srflx address is 145.114.190.185:62147 09:20:35.581 pjsua_call.c Timed-out trying to acquire PJSUA mutex (possibly system has deadlocked) in med_tp_timer_cb 09:20:35.582 icetp00 .ICE stream transport destroyed 09:20:38.247 icetp01 !....Comp 1: host candidate 192.168.0.4:36844added 09:20:38.247 icetp01 ....Comp 2: srflx candidate starts Binding discovery 09:20:38.259 icetp01 ....Comp 2: host candidate 192.168.0.4:54071added 09:20:38.260 icetp01 ....ICE stream transport created 09:20:38.260 pjsua_media.c ...Media index 0 selected for audio call 0 09:20:38.261 test.c ..Incoming call from <sip:192.168.1.100>!! 09:20:38.261 pjsua_call.c ..Answering call 0: code=200 09:20:38.261 pjsua_call.c ...Pending answering call 0 upon completion of media transport 09:20:38.262 pjsua_call.c Error initializing media channel: Pending operation (PJ_EPENDING) [status=70002] 09:20:38.263 faba_ua.c ......Call 0 state=DISCONNCTD 09:20:38.263 pjsua_media.c ......Call 0: deinitializing media.. 09:20:38.263 pjsua_media.c Call 0: deinitializing media.. 09:20:38.264 stuntp0x4402c2 .STUN mapped address found/changed: 145.114.190.185:62443 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20120905/19849e73/attachment-0001.html>