I am try to add mailboxes on the system with numbers that match the owner's extension numbers (i.e. mailbox 105 matched to extension 105). I have three such matches on the system and they have been working fine. I created mailbox 105 with no problems but when I try to assign extension 105 as the owner's extension I get an improper entry message. I get this with using either the direct rs-232 to the TVS or using the message manager's input via the phone. Any thoughts are appreciated.