3Com 3C10402B, Руководство администратора

Страница: 287 / 582

Managing Extensions 287
Example: If you initially have 60 telephones and expect to add no more
than 100 additional telephones in the future, choose 100–299 as the
telephone extension range (1000–1199 in a 4-digit system). This
arrangement provides 200 extension numbers to manage the planned
160 telephones plus 40 extra extensions to manage unexpected
additions.
Once you set the telephone extension range, you can extend it later,
provided that the new range does not overlap any other number range.
Example: For a 4-digit dial plan, you can set the initial telephone
extension range to 1000–1099. This arrangement allows for up to 100
telephone extensions. Later, you can extend the range up to 3999 to
allow for 400 telephone extensions. By default, the Hunt Group range
starts at 4000, 450 for a 3-digit dial plan, so you cannot assign telephone
extensions in either of those ranges.
How Auto Discovery
Assigns Extensions
The Auto Discovery process assigns new extensions to telephones and
other devices. For example, if you install a T1 or E1 Digital Line Card, you
can use Auto Discovery to assign extension numbers to each port on the
card. The Auto Discovery process initially assigns a default name
(new
user) to each new telephone, and assigns the next available extension
number. Later, you can replace (new user) with the appropriate telephone
user’s name.
It is possible to bypass the Auto Discovery process and to add a new
telephone and assign an extension manually. However, 3Com strongly
recommends that you take advantage of the Auto Discovery process. For
instructions about how to use Auto Discovery, see
“Adding a New
Telephone” on page 93 .
You can define a telephone user in the system database and not assign a
telephone to that user. When you define a telephone user with only a
telephone extension, you create a
phantom mailbox . The system
associates an extension with this phantom mailbox so that the telephone
user has voice mail capability. To access voice mail from any telephone,
the telephone user calls either extension 500 (the default Auto Attendant
extension), or 501 (the default Auto Attendant voice mail extension.)
Telephones and Line Card ports reserve most of the extensions within the
system. However, there are other extensions within the system.
Table 54
lists the default extension ranges for 3-digit and 4-digit dial plans.