(gdb) bt full
#0  0xb6f81128 in iax2_destroy (callno=1347) at chan_iax2.c:1309
        _count = 0
        _sched_res = -1
        pvt = (struct chan_iax2_pvt *) 0x0
        owner = (struct ast_channel *) 0x0
        __PRETTY_FUNCTION__ = "iax2_destroy"
#1  0xb6fa7a3a in __iax2_poke_noanswer (data=0x820e478) at chan_iax2.c:8869
        peer = (struct iax2_peer *) 0x820e478
        callno = 1347
        __PRETTY_FUNCTION__ = "__iax2_poke_noanswer"
#2  0xb6fa5d05 in iax2_process_thread (data=0x8219fb8) at chan_iax2.c:8642
        _buffer = {__routine = 0xb6fa5647 <iax2_process_thread_cleanup>, __arg = 0x8219fb8, __canceltype = 135533548, 
  __prev = 0xb6d4c430}
        thread = (struct iax2_thread *) 0x8219fb8
        tv = {tv_sec = -1209002816, tv_usec = 136341648}
        ts = {tv_sec = 0, tv_nsec = -1209008140}
        put_into_idle = 1
        __PRETTY_FUNCTION__ = "iax2_process_thread"
#3  0x08118ad9 in dummy_start (data=0x820ca88) at utils.c:912
        _buffer = {__routine = 0x806a51f <ast_unregister_thread>, __arg = 0xb6d4cbb0, __canceltype = 0, __prev = 0x0}
        ret = (void *) 0x0
        a = {start_routine = 0xb6fa570d <iax2_process_thread>, data = 0x8219fb8, 
  name = 0x8206890 "iax2_process_thread  started at [ 9161] chan_iax2.c start_network_thread()"}
        lock_info = (struct thr_lock_info *) 0x821e570
        mutex_attr = {__mutexkind = 1}
#4  0xb7f83240 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
No symbol table info available.
#5  0xb7e9e49e in clone () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.