Hi all. I coded my app by imitating symbian_ua. Register was ok.During I were talking with someone by my app,and then suddenly WIFI couldn't be used,the pjsip crashed. I debuged the pjsip. after the connection was lost , my sip called pj_symbianos_set_connection_status(PJ_FALSE) and pjsua_destroy().the app crashed when calling pjsua_destroy(). At View Debug window(carbide c++)View Disassembly window, the below is shown: Thread [Thread id: 1164] (Suspended: Signal 'Exception 0' received. Description: A data abort exception has occurred..) 6 tsx_destroy() F:\Symbian\Carbide\workspace\pjproject-1.7\pjsip\src\pjsip\sip_transaction.c:1038 0x792e9130 5 tsx_set_state() F:\Symbian\Carbide\workspace\pjproject-1.7\pjsip\src\pjsip\sip_transaction.c:1171 0x792e9518 4 tsx_on_state_terminated() F:\Symbian\Carbide\workspace\pjproject-1.7\pjsip\src\pjsip\sip_transaction.c:3149 0x792ecd7c 3 tsx_timer_callback() F:\Symbian\Carbide\workspace\pjproject-1.7\pjsip\src\pjsip\sip_transaction.c:1076 0x792e927e 2 CPjTimerEntry::RunL() F:\Symbian\Carbide\workspace\pjproject-1.7\pjlib\src\pj\timer_symbian.cpp:254 0x793700aa 1 Unknown (0x80295108)() 0x80295108 Can anyone help me with this? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20101105/8de44378/attachment.html>