I am a new administrator of a Nortel BCM 400 system. I am an IT guy but this is my first phone system. I have three DID lines that are not going to the correct mailbox. When I dial the extension internally the correct mailbox answers, but when I dial the DID number the call goes to the General Mailbox. The target line setting seem to be correct. I have compared settings with my other DID lines that are working correctly and everything seems to be correct. Can anyone give me some advice on how to correct this?