(gdb) bt
#0  0xb684a196 in leave_voicemail (chan=0x831da00, ext=0xb6680c30 "204906", options=0xb6680d7c) at app_voicemail.c:3008
#1  0xb684bed9 in vm_exec (chan=0x831da00, data=0xb6684e68) at app_voicemail.c:6878
#2  0x080c7c33 in pbx_extension_helper (c=0x831da00, con=0x0, context=0x831db80 "macro-stdexten", 
    exten=0x831dbd0 "s-NOANSWER", priority=1, label=0x0, callerid=0x831f2d8 "204715", action=E_SPAWN) at pbx.c:532
#3  0xb67ec1d9 in _macro_exec (chan=0x831da00, data=<value optimized out>, exclusive=0) at app_macro.c:308
#4  0x080c7c33 in pbx_extension_helper (c=0x831da00, con=0x0, context=0x831db80 "macro-stdexten", 
    exten=0x831dbd0 "s-NOANSWER", priority=1, label=0x0, callerid=0x831f2d8 "204715", action=E_SPAWN) at pbx.c:532
#5  0x080c9916 in __ast_pbx_run (c=0x831da00) at pbx.c:2288
#6  0x080ca8ae in pbx_thread (data=0x831da00) at pbx.c:2601
#7  0x080f660b in dummy_start (data=0x831f870) at utils.c:545
#8  0xb7f6931b in start_thread () from /lib/i686/cmov/libpthread.so.0
#9  0xb7d7d8ee in clone () from /lib/i686/cmov/libc.so.6