Nortel BCM 3.7, Manual

Page: 294 / 1004

294 Defining DN length
N0008589 3.3
Defining DN length
The DN lengths setting allows you to change the number of digits for the Received number length
and the DN length, which are used by the system to determine if an incoming call is valid for the
system.
Each increase in length repeats the first digit in front of any existing DN. For example, if DN 234
was increased to a length of 4, the new DN would be 2234.
This section contains this information:
• “Changing the DN length” on page 295
• “Using the Received # length” on page 296
Warning: Do not change DN length immediately after a system startup.
You must wait for at least two minutes after a system startup before you change the DN
length. It is preferable that you change this setting at system startup using the Quick Start
Wizard. Refer to
“What you need to know before you use the wizard” on page 105 .
If you change the DN length after startup:
• Data devices using B2 channels drop calls when you change the DN length during
system operation.
• The change takes up to two minutes, depending on the size of the system. System
response can briefly slow down during this time.
Warning:
Increasing the DN length affects other areas of the system:
If the DN length change creates a conflict with the Park prefix, external line access code,
direct-dial digit, or any line pool access code, the setting for the prefix or code changes to
None, and the corresponding feature is disabled.
Optional applications affected by DN length changes:
Voice mail , and Call Center applications are reset if you change the DN length after these
services are installed.
If you are using IVR, you will need to correct the scripting.
If you have a legacy DECT system, you will need to rerun the DECT Wizard to ensure
that the DECT module firmware recognizes the change in DN numbers.