(gdb) bt full
#0  0xb6fc9128 in iax2_destroy (callno=14750) 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  0xb6fefa3a in __iax2_poke_noanswer (data=0x820cbc0) at chan_iax2.c:8869
        peer = (struct iax2_peer *) 0x820cbc0
        callno = 14750
        __PRETTY_FUNCTION__ = "__iax2_poke_noanswer"
#2  0xb6fedd05 in iax2_process_thread (data=0x8206a50) at chan_iax2.c:8642
        _buffer = {__routine = 0xb6fed647 <iax2_process_thread_cleanup>, __arg = 0x8206a50, __canceltype = 135533548, __prev = 0xb6f74430}
        thread = (struct iax2_thread *) 0x8206a50
        tv = {tv_sec = -1208707904, tv_usec = 136365344}
        ts = {tv_sec = 0, tv_nsec = -1208713228}
        put_into_idle = 1
        __PRETTY_FUNCTION__ = "iax2_process_thread"
#3  0x08118ad9 in dummy_start (data=0x82064a0) at utils.c:912
        _buffer = {__routine = 0x806a51f <ast_unregister_thread>, __arg = 0xb6f74bb0, __canceltype = 0, __prev = 0x0}
        ret = (void *) 0x0
        a = {start_routine = 0xb6fed70d <iax2_process_thread>, data = 0x8206a50, name = 0x820c520 "iax2_process_thread  started at [ 9161] chan_iax2.c start_network_thread()"}
        lock_info = (struct thr_lock_info *) 0x8215798
        mutex_attr = {__mutexkind = 1}
#4  0xb7fcb240 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
No symbol table info available.
#5  0xb7ee649e in clone () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.