I have a BCM 400 that is patched. it will not allow me to create certain mailboxes. for example ext6939 is using mailbox 7000 because the system will not save mailbox 6939. I have 4 available mailboxes and have rebooted the system and I can create other 69xx mailboxes just not the one I need. it will let me build it but it will not save after pressing accept