(gdb) bt
#0  0x080f3ecc in ast_copy_string (dst=0x0, src=0xb74bb795 "INBOX", size=80)
    at /home/patrick/asterisk-1.4.4/include/asterisk/strings.h:160
#1  0xb743f16d in imap_mailbox_name (spec=0xb6cc1d90 "o?È·¬#̶\"Ä\022\b\022", vms=0x0, box=0, use_folder=1)
    at app_voicemail.c:4614
#2  0xb743746a in imap_store_file (dir=0xb6cc30cc "/var/spool/asterisk/voicemail/default/2500/unavail",
    mailboxuser=0xb6cc42d4 "2500", mailboxcontext=0xb6cc4284 "default", msgnum=-1, chan=0x82246b8, vmu=0xb6cc4284,
    fmt=0xb6cc1cc0 "gsm", duration=2, vms=0x0) at app_voicemail.c:2426
#3  0xb744b936 in play_record_review (chan=0x82246b8, playfile=0xb74bce60 "vm-rec-unv",
    recordfile=0xb6cc30cc "/var/spool/asterisk/voicemail/default/2500/unavail", maxtime=0, fmt=0xb752bc60 "gsm",
    outsidecaller=0, vmu=0xb6cc4284, duration=0xb6cc416c, unlockdir=0x0, record_gain=0 '\0', vms=0x0) at app_voicemail.c:8018
#4  0xb744374d in vm_options (chan=0x82246b8, vmu=0xb6cc4284, vms=0xb6cc4788, fmtc=0xb752bc60 "gsm", record_gain=0 '\0')
    at app_voicemail.c:5833
#5  0xb74467e5 in vm_execmain (chan=0x82246b8, data=0xb6ccb008) at app_voicemail.c:6668
#6  0x080b5ee1 in pbx_exec (c=0x82246b8, app=0x81d61a8, data=0xb6ccb008) at pbx.c:532
#7  0x080b9327 in pbx_extension_helper (c=0x82246b8, con=0x0, context=0x8224838 "sip-internal", exten=0x8224888 "7777",
    priority=1, label=0x0, callerid=0x8202180 "2400", action=E_SPAWN) at pbx.c:1833
#8  0x080ba3f5 in ast_spawn_extension (c=0x82246b8, context=0x8224838 "sip-internal", exten=0x8224888 "7777", priority=1,
    callerid=0x8202180 "2400") at pbx.c:2288
#9  0x080ba8c5 in __ast_pbx_run (c=0x82246b8) at pbx.c:2388
#10 0x080bb61f in pbx_thread (data=0x82246b8) at pbx.c:2601
#11 0x080f50b9 in dummy_start (data=0x8225060) at utils.c:545
#12 0xb7ee8240 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#13 0xb7d133de in clone () from /lib/tls/i686/cmov/libc.so.6