Keep all the mailboxes as group 1 unless you plan on dividing mailboxs into groups.

The @G(4200) will cause the call to go directly the mailbox 4200, then execute the Extension field in that box. If the extension field is 4200, then it will call ext 4200 ( if Do Not Disturb is OFF). Chain Done never runs from box 0. The call goes immediately to box 4200 (if Do Not Disturb is OFF).

The chain done to 999 is a hangup, and is there to prevent loops locking up the port.

> "users have the option to dial a 4 digit extension, press 7 for name directory or 0 for assistance."

I thought you said the menu options were empty. How is there an option 7? Check box 990 and 991 again and see if menu option 0 is defined.