If you have the VOIP Connection’s VS-1, your internal CF card may have been formatted in msdos or vfat. When upgrading to the newest version of Asterisk (1.0.9, I believe) from the VOIP Connection, make sure that your internal CF card is formatted in ext2, and not msdos or vfat as their new version has become case sensitive. It’ll save you a lot of voicemail heartache 