#0  0x080f0171 in ast_copy_string (dst=0x0, src=0x287056 "NBOX", size=80)
    at /usr/src/asterisk-1.4.2/include/asterisk/strings.h:160
#1  0x0020df78 in imap_mailbox_name (spec=0xb7663880 "", vms=0x0, box=0,
    use_folder=1) at app_voicemail.c:4614
#2  0x00205b50 in imap_store_file (
    dir=0xb7664b60 "/var/spool/asterisk/voicemail/from-sip/201/unavail",
    mailboxuser=0xb7665d40 "201", mailboxcontext=0xb7665cf0 "from-sip",
    msgnum=-1, chan=0x95f2dd0, vmu=0xb7665cf0, fmt=0x286e4e "WAV", duration=2,
    vms=0x0) at app_voicemail.c:2426
#3  0x0021a600 in play_record_review (chan=0x95f2dd0,
    playfile=0x288734 "vm-rec-unv",
    recordfile=0xb7664b60 "/var/spool/asterisk/voicemail/from-sip/201/unavail", maxtime=0, fmt=0x2fd320 "wav49|gsm|wav", outsidecaller=0, vmu=0xb7665cf0,
    duration=0xb7665c00, unlockdir=0x0, record_gain=0 '\0', vms=0x0)
    at app_voicemail.c:8018
#4  0x002123fb in vm_options (chan=0x95f2dd0, vmu=0xb7665cf0, vms=0xb7666210,
    fmtc=0x2fd320 "wav49|gsm|wav", record_gain=0 '\0') at app_voicemail.c:5833
#5  0x002155c0 in vm_execmain (chan=0x95f2dd0, data=0xb766ab00)
    at app_voicemail.c:6668
#6  0x080b3ed4 in pbx_exec (c=0x95f2dd0, app=0x9537c40, data=0xb766ab00)
    at pbx.c:532
#7  0x00f50783 in realtime_exec (chan=0x95f2dd0, context=0x95f2f50 "from-sip",
    exten=0x95f2fa0 "15", priority=3, callerid=0x95f4328 "201",
    data=0x9591c91 "from-sip@realtime_ext") at pbx_realtime.c:216
#8  0x080b70b0 in pbx_extension_helper (c=0x95f2dd0, con=0x0,
    context=0x95f2f50 "from-sip", exten=0x95f2fa0 "15", priority=3, label=0x0,
    callerid=0x95f4328 "201", action=E_SPAWN) at pbx.c:1830
#9  0x080b809b in ast_spawn_extension (c=0x95f2dd0,
    context=0x95f2f50 "from-sip", exten=0x95f2fa0 "15", priority=3,
    callerid=0x95f4328 "201") at pbx.c:2274
#10 0x080b8589 in __ast_pbx_run (c=0x95f2dd0) at pbx.c:2374
#11 0x080b9286 in pbx_thread (data=0x95f2dd0) at pbx.c:2587
#12 0x080f12dd in dummy_start (data=0x95f3580) at utils.c:545
#13 0x00904371 in start_thread () from /lib/tls/libpthread.so.0
#14 0x0077dffe in clone () from /lib/tls/libc.so.6