(gdb) bt
#0  0x03638a55 in leave_voicemail (chan=0x8cd4838, ext=0xb74c8e60 "201",
    options=0xb74d17e8) at app_voicemail.c:3165
#1  0x03646ffa in vm_exec (chan=0x8cd4838, data=0xb74d1a60)
    at app_voicemail.c:7025
#2  0x080b95c7 in pbx_exec (c=0x8cd4838, app=0x8c917e8, data=0xb74d1a60)
    at pbx.c:558
#3  0x0072979f in realtime_exec (chan=0x8cd4838, context=0x8cd49c0 "from-sip",
    exten=0x8cd4a10 "201", priority=6, callerid=0x8cd4c78 "201",
    data=0x8b9c0e1 "from-sip@realtime_ext") at pbx_realtime.c:216
#4  0x080bc4cc in pbx_extension_helper (c=0x8cd4838, con=0x0,
    context=0x8cd49c0 "from-sip", exten=0x8cd4a10 "201", priority=6,
    label=0x0, callerid=0x8cd4c78 "201", action=E_SPAWN) at pbx.c:1795
#5  0x080bd66e in ast_spawn_extension (c=0x8cd4838,
    context=0x8cd49c0 "from-sip", exten=0x8cd4a10 "201", priority=6,
    callerid=0x8cd4c78 "201") at pbx.c:2278
#6  0x080bdb5c in __ast_pbx_run (c=0x8cd4838) at pbx.c:2378
#7  0x080be904 in pbx_thread (data=0x8cd4838) at pbx.c:2611
#8  0x080f7c11 in dummy_start (data=0x8cd5558) at utils.c:545
#9  0x0050e3cc in start_thread () from /lib/tls/libpthread.so.0
#10 0x00397c3e in clone () from /lib/tls/libc.so.6