Each mailbox has a unique mailbox number.
Usually you create a personal mailbox for each subscriber and use the extension number as the mailbox number.
A mailbox number does not have to be the same as its associated extension number.
An extension must have an associated mailbox if it is to be answered by Call Answering.
Mailbox numbers:
must have the same number of digits as the extension numbers in use at your site
must not be assigned to another mailbox
cannot start with the Group List Leading Digit
cannot conflict with a Name Dialing prefix, a Special Addressing prefix or a Site Prefix
There are a small number of reserved mailbox numbers.
Reserved mailbox numbers start with 1 unless the Group List Leading Digit
is 1, in which case they start with 2.
# of digits |
Reserved mailbox numbers |
2 |
10, 12, 13-17 |
3 |
100, 102, 103-107 |
4 |
1000, 1002, 1007 |