In the SVMi-20E under the Extension blocks, page 4, I have NO-ANSR and BUSY set to go to their own mailbox.

In Device Manager 5.15.6, all extension are "Forward Cancel" except for certain extensions where employees have left. Those are set to "All" to people taking over their work.

"Try not to become a man of success, but rather try to become a man of value" ~ Albert Einstein