Line Pool Access Codes; Using Carrier Codes; Configuring Call Routing - Nortel BCM50 Configuration Manual

234 Chapter 24 Dialing plans

Line pool access codes

Line pool access codes allow you to assign an access code for each of the basic line pools (A to O).
These codes specify the line pool for making an outgoing external call. Up to three digits in length,
these codes do not allow any other routing programming. The user simply dials the code in front of
the dial string. The system, in turn, deletes the entire code before sending the call out over the
appropriate route.
If you need a more complex routing arrangement, you need to specify routes and destination
codes, which allows you more flexibility in terms of dial strings, routing schedules, and routing
restrictions.

Using Carrier codes

A multi-digit Carrier access code contains an Equal Access Identifier Code (CAC) followed by a
Carrier Identification Code (CIC). The CIC identifies the carrier that handles the call. The Carrier
Access Code table stores the CAC digit pattern that you define for your region.
In most cases it is not necessary to change the default values.
About Carrier access codes
Here are some general points about carrier access codes:
• You can define up to five carrier codes.
• Two entries will be predefined in North America, but you can remove these defaults.
• Each entry consists of an equal access identifier code prefix (one to six digits) and a carrier
identification code length (one digit, 1 to 9).
• Each entry is identified by the prefix digits themselves.

Configuring call routing

Call routing allows you to define how calls are routed by your BCM system.
Call routing decides what path an outgoing call takes using the digits that are dialed. It is
sometimes called Automatic Route Selection (ARS).
When you select an internal line and dial, the system checks the numbers you enter against the
routing tables. If the number you dial starts with a destination code, the system uses the line pool
and dials out digits specified by the route assigned to that destination code, and then dials the rest
of the number that you dialed.
Routing service replaces a number of manual tasks, including:
• entering a line pool code
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