3Com NBX 100, Installation Manual

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48 C
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Some countries (for example, Sweden) reserve numbers beginning with
11 for
numbers of national importance . To accommodate this
requirement, you can begin the telephone extension range at 120.
Telephones The telephone extension range depends on the number of telephones
you have.
Example: If you initially have 60 telephones and expect to add no more
than 100 additional telephones in the future, you can choose
100 to 299 as the telephone extension range (1000 to 1199 in a 4-digit
system). This provides 200 total extension numbers to handle the planned
160 telephones plus 40 extra extensions to handle unexpected additions.
If you set the telephone extension range you can extend it later, provided
that the new range does not overlap any other range.
Example: You set the initial telephone extension range to 100 through
199. Later, you can extend this up to 499, but not beyond, because the
auto attendant range starts at 500.
External Extensions The external extension range defines those extensions that connect the
user to outside devices, such as external telephone lines. You can connect
external lines to the NBX 100 using the 4-port line card (loop start
telephone lines) or one of the Digital Line Cards (T1, E1, ISDN PRI).
Call Park The extension range for call park defines the extensions you can use to
park a telephone call for pickup at a different telephone. Typically, people
use call park infrequently; therefore, the default call park range is small.
The range you choose for call park must be within the external extension
range for the call park function to work.
Auto Attendant The size of the extension range for auto attendant lines depends on the
number of different menus you expect to use.
A menu is the set of choices presented to callers. A single menu typically
has choices such as “Press 1 if you are calling from a touch tone
telephone” and “Press 2 if you want to speak to a service representative”.
A typical auto attendant range for a 3-digit system is 500 through 599; a
4-digit system uses extensions 500 and 501, plus the range from 5500