Incoming Call Routing - Nortel BCM50 Configuration Manual

224 Chapter 24 Dialing plans
MCDN trunks also allow public call types when tandeming calls from another system on the
private network. Some of these systems use specific call types that the BCM needs to recognize to
pass on correctly. Also refer to
Type of call
Local
National
Special calls
(international, 911,
etc.)

Incoming call routing

Incoming call routing also depends on the call type. The system also uses the Public and Private
DN length settings to determine call routing.
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 four, the new DN would be 2234.
Warning: Do not change DN length immediately after a system start-up.
You must wait until the system is operational with two solid green status LEDs.
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 Contact Center applications are reset if you change the DN length after
these services are installed.
If you increase your DN length and then decide to decrease the DN length you will have to
cold start your system and lose all of the programming.
NN40020-603 NN40020-603
"Using the MCDN access codes (tandem calls)" on page
NPI/TON BCM prepend access
code
E164/Local Local access code (9)
E164/National National access code (X1)
Private/Special Special access code (9)
232.
BCM monitor display
E.164/Subscriber
E.164/National