Least Cost Routing Dial Plan Table; Inbound And Outbound Call Processing - 3Com NBX 100 Installation Manual

Least Cost Routing
Dial Plan Table
Inbound and
Outbound Call
Processing
The Least Cost Routing table (table ID 3) defines how to route calls in
order to minimize the cost of those calls.
Example: You might use two different long distance carriers, one for a
specific geographic region, and one for all other areas of the country. In
the Least Cost Routing table you can create entries that route calls
differently for those two geographic areas. Each country uses a different
method to accomplish this. In the United States, you can specify the area
codes that apply to a geographic region. In France, you can specify a
carrier by adding prefix digits to the telephone number.
By default, internal telephones specify the Least Cost Routing table as
their least cost table. Typically devices associated with the Incoming Dial
Plan table (Line Card ports, Digital Line Card ports and H.323 gateways)
do not use the Least Cost Routing table.
If the Least Cost Routing table exists, it takes precedence over the Internal
table. If the NBX 100 cannot execute the entry in the Least Cost Routing
table, it does not attempt to find a corresponding entry in the Internal
table. If you have entries in both the Least Cost and Internal tables for the
same purpose, the behavior of the dial plan can be confusing.
Example: If a new entry in the Internal table appears not to work, it is
possible that the NBX 100 is using an entry from the Least Cost table
instead. To avoid such conflicts, you can accomplish least cost routing
using only the Internal table. 3Com strongly recommends that you keep
the Dial Plan as simple as possible by using only the Internal table.
The NBX 100 routes all inbound and outbound calls through the Dial
Plan.
Inbound Call Processing
The NBX 100 processes inbound calls using the Incoming table and can
also use Pretranslators to perform digit manipulations on incoming calls
prior to using the Incoming table.
Example: The telephone company assigns to the company a group of
4-digit DID/DDI numbers from 6000 through 6199; however, the
company wants to use internal telephone extensions from 3000 through
3199. Also, the company wants the number 6111 to connect the caller to
an auto attendant line for the customer service group. See "Sample
Solutions Using Dial Plan Configuration File Commands" on page 119 to
Dial Plan Tables 55