Wirelessly posted (8320: BlackBerry8320/4.2.2 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
Maybe I'm missing something but the missed call icon normally isn't an envelope. That's the message icon. It might be because you have call logging set to show calls in ur messages. Try phone > options > call logging. If that's set to something other than none then you most likely see the message icon for missed calls. I keep it set to none because I don't want that stuff in my messages. You may want to try that.