NEC Univerge SV8100 VM8000 InMail System Manual page 54

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47-11-01 Answer Schedule Override (Schedule Override)
Enter 1 (Yes) to enable Answer Schedule Override.
You can also enable Answer Schedule Override from the System
Administrator Mailbox. See Operation below.
By default, Answer Schedule Override is disabled (0).

Specify the Override Mailbox Category.
47-11-02 Override Mailbox Category (Override MB Ctg)
When you enable Answer Schedule Override for the selected Answer
Table, you can choose to route Automated Attendant calls to any of the
following mailbox categories:
1 Station Mailbox
2 Group Mailbox
3 Routing Mailbox
0 Undefined
By default, this option is 0 (undefined).

Specify the Override Mailbox Number.
47-11-02 Override Mailbox Number (Override MB Num)
For the selected Answer Table, choose the Override Mailbox number
(maximum 3 digits, using 0~9). The mailbox number you select must match
the mailbox category specified in 47-11-02 above.
By default, there is no entry for this option.

Optionally enable Answer Schedule Override from the System Administrator
Mailbox.
VM8000
Features