I met this crash twice recently. The app crashed when the tcp transport met some error while sending 180 response for INVITE request.This is the crash log :
2014-03-20 11:50:39.637 XXX[16447:7a03] 11:50:39.637 tsx0x1788c464 .....State changed from Proceeding to Proceeding, event=TX_MSG
2014-03-20 11:50:39.639 XXX[16447:7a03] 11:50:39.639 dlg0x1793c064 ......Transaction tsx0x1788c464 state changed to Proceeding
2014-03-20 11:50:39.667 XXX[16447:7a03] 11:50:39.667 tsx0x1788c464 State changed from Proceeding to Terminated, event=TRANSPORT_ERROR
2014-03-20 11:50:39.675 XXX[16447:7a03] 11:50:39.675 dlg0x1793c064 Transaction tsx0x1788c464 state changed to Terminated
2014-03-20 11:50:39.687 XXX[16447:7a03] 11:50:39.687 pjsua_media.c ..Call 2: deinitializing media..
Assertion failed: (!dd->uas_state->retransmit_timer.id), function pjsip_100rel_end_session, file ../src/pjsip-ua/sip_100rel.c, line 388.
(lldb) bt
* thread #9: tid = 0x13d530, 0x3a0691f0 libsystem_kernel.dylib`__pthread_kill + 8, stop reason = signal SIGABRT
frame #0: 0x3a0691f0 libsystem_kernel.dylib`__pthread_kill + 8
frame #1: 0x3a0d3796 libsystem_pthread.dylib`pthread_kill + 58
frame #2: 0x3a019fdc libsystem_c.dylib`abort + 76
frame #3: 0x39ff9cae libsystem_c.dylib`__assert_rtn + 182
* frame #4: 0x0034b282 WHua`pjsip_100rel_end_session(inv=<unavailable>) + 90 at sip_100rel.c:388
frame #5: 0x00344026 WHua`inv_set_state(inv=0x170ed614, state=<unavailable>, e=<unavailable>) + 294 at sip_inv.c:282
frame #6: 0x00346ef6 WHua`inv_on_state_early(inv=0x170ed614, e=0x054eae98) + 258 at sip_inv.c:3945
frame #7: 0x003468e8 WHua`mod_inv_on_tsx_state(tsx=0x1788c464, e=0x054eae98) + 64 at sip_inv.c:640
frame #8: 0x0033d60a WHua`pjsip_dlg_on_tsx_state(dlg=0x1793c064, tsx=0x1788c464, e=0x054eae98) + 90 at sip_dialog.c:2023
frame #9: 0x0033a9a8 WHua`tsx_timer_callback(theap=<unavailable>, entry=<unavailable>) + 180 at sip_transaction.c:1126
frame #10: 0x002f9b54 WHua`pj_timer_heap_poll(ht=0x170b229c, next_delay=0x054eaf5c) + 156 at timer.c:638
frame #11: 0x0032fa70 WHua`pjsip_endpt_handle_events2(endpt=0x170b2064, max_timeout=0x054eaf84, p_count=0x054eaf8c) + 68 at sip_endpoint.c:712
frame #12: 0x00356a2c WHua`worker_thread [inlined] pjsua_handle_events(msec_timeout=0) + 24 at pjsua_core.c:1759
frame #13: 0x00356a14 WHua`worker_thread(arg=<unavailable>) + 40 at pjsua_core.c:681
frame #14: 0x002f1d72 WHua`thread_main(param=0x0520de40) + 86 at os_core_unix.c:523
frame #15: 0x3a0d2918 libsystem_pthread.dylib`_pthread_body + 140
frame #16: 0x3a0d288a libsystem_pthread.dylib`_pthread_start + 102
frame #17: 0x3a0d0aa4 libsystem_pthread.dylib`thread_start + 8
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