(gdb) bt full
#0  0x003f07a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
No symbol table info available.
#1  0x004317a5 in raise () from /lib/tls/libc.so.6
No symbol table info available.
#2  0x00433209 in abort () from /lib/tls/libc.so.6
No symbol table info available.
#3  0x00465a1a in __libc_message () from /lib/tls/libc.so.6
No symbol table info available.
#4  0x0046c4c0 in _int_free () from /lib/tls/libc.so.6
No symbol table info available.
#5  0x0046c63a in free () from /lib/tls/libc.so.6
No symbol table info available.
#6  0x0045ca46 in fclose@@GLIBC_2.1 () from /lib/tls/libc.so.6
No symbol table info available.
#7  0x080a06d4 in ast_closestream (f=0x9ab4648) at file.c:796
        cmd = 0x0
        size = 0
        __PRETTY_FUNCTION__ = "ast_closestream"
#8  0x0018bd32 in ast_monitor_stop (chan=0x98f7ae8, need_lock=0) at res_monitor.c:272
        filename = '\0' <repeats 76 times>, "BYE sip:02214640328@200.123.190.50:5060 SIP/2.0\r\nVia: SIP/2.0/UDP 200.49.31.214:5060;branch=z9hG4bK50772a73;rport\r\nFrom: \"asterisk\" <sip:asterisk@200.49.31.214>;tag=as170bd025\r\nTo: <sip:0221"...
        delfiles = 0
        __PRETTY_FUNCTION__ = "ast_monitor_stop"
#9  0x0807f09a in ast_channel_free (chan=0x98f7ae8) at channel.c:1222
        fd = 0
        vardata = (struct ast_var_t *) 0x4745198
        f = (struct ast_frame *) 0x98f7ae8
        headp = (struct varshead *) 0x98f7e2c
        datastore = (struct ast_datastore *) 0x0
        name = "SIP/CrossPhone IP-099cd0f8", '\0' <repeats 53 times>
        __PRETTY_FUNCTION__ = "ast_channel_free"
#10 0x08080d15 in ast_hangup (chan=0x98f7ae8) at channel.c:1781
        res = 0
        cdr = (struct ast_cdr *) 0xb69c7a00
        __PRETTY_FUNCTION__ = "ast_hangup"
#11 0x080c0a3b in __ast_pbx_run (c=0x98f7ae8) at pbx.c:2543
        found = 1
---Type <return> to continue, or q <return> to quit---
        res = 0
        autoloopflag = 0
        error = 1
        __PRETTY_FUNCTION__ = "__ast_pbx_run"
#12 0x080c0c0d in pbx_thread (data=0x98f7ae8) at pbx.c:2603
        c = (struct ast_channel *) 0x98f7ae8
#13 0x080fa80d in dummy_start (data=0x9785e48) at utils.c:793
        _buffer = {__routine = 0x80696c8 <ast_unregister_thread>, __arg = 0x4745ba0, __canceltype = 74732488,
  __prev = 0x0}
        ret = (void *) 0x5306f4
        a = {start_routine = 0x80c0bf6 <pbx_thread>, data = 0x98f7ae8,
  name = 0x9a13330 "pbx_thread", ' ' <repeats 11 times>, "started at [ 2627] pbx.c ast_pbx_start()"}
        __PRETTY_FUNCTION__ = "dummy_start"
#14 0x005ee3cc in start_thread () from /lib/tls/libpthread.so.0
No symbol table info available.
#15 0x004d2c3e in clone () from /lib/tls/libc.so.6
No symbol table info available.