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Dial Plan Tables 39
Command Format” on page 34. For a description of the each element of
a dial plan command, see Table 6
on page 35.
By default, Line Card ports, Digital Line Card ports, and H.323 gateways
use the Incoming dial plan table as their normal dial plan table. An
Incoming dial plan table typically has a more restricted list of dialable
digits than the Internal dial plan table. You usually cannot dial extensions
associated with internal paging or Analog or Digital Line Card ports.
Least Cost Routing
Dial Plan Table
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.
The Least Cost Routing table is optional. If it does not exist, the system
uses the Internal table routing destinations. 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. Therefore, 3Com recommends that you
accomplish least cost routing using Internal Table entries. See TimedRoute
Create, TimedRouteEntry Create, and TimedRouteOperation Create.
Example: If a new entry in the Internal table appears not to work, it is
possible that the system is using an entry from the Least Cost table
instead. To avoid such conflicts, 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.