My company is using the Norstar startalk Flash system. All of the instructions I have indicate that this is from the mid 90's. I have been asked to remove one of the extensions. We're not using CCR but rather we're set up so that you can dial the last name of the person in a directory. I have managed to disable the persons name in the directory and deleted their mailbox, but external callers can still directly dial the extension number. How in the world do I change this?