Nortel BCM 3.7 Manual page 208

208 Creating numbering plans
Internal feature access: Meanwhile, you need to keep in mind that the leading digit of any of the
above dialing codes cannot conflict with the other system access codes that you want to use:
Variable
Park Prefix
Direct Dial Digit
Line pool and destination access codes: Once these basic numbers have been picked, you can
decide what numbers to use for line pool access codes and/or destination codes. The system will
not allow these codes to start with any of the numbers currently assigned. If you are working with
an established system of dialing, you may want to ensure that the numbers that the users are
familiar with dialing are reserved for these codes.
For instance, if the users are familiar with dialing 9XXXXXXX to access numbers outside of their
own offices, you will want to reserve this number for the destination codes. If you are setting up a
new system, you could opt to use the location codes of the other systems as destination codes, or
you could define one number for local calls (but which are still outside the system) and one
number for long haul calls. For example: The users may dial 6<DN number> for calls within a
local system, but dial 8<area code><DN number> for calls in another city over the public network.
Variable
Line pool codes (first character)
Destination codes (first character)
Analog telephones require a code to dial out of the system, since the intercom button only accesses
the internal system. The external access code may be the same as a line pool code, in which case,
the line pool code overrides this setting.
Variable
External code
N0008589 3.3
Example or default settings
1 (101-125)
0
Example or default settings
5
6<up to 11 more characters>
9<up to 11 more characters>
Example or default settings
9