3Com 3C10402B, Руководство администратора

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Dial Plan Tables 269
The incoming dial plan table consists of a series of commands. For an
example and basic understanding of the command format, see
“Dial Plan
Command Format” on page 264 . For a description of the each element
of a dial plan command, see Table 52 on page 265 .
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 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 does not work, it is possible
that the system is using an entry from the Least Cost table instead. To
avoid such conflicts, you can achieve least cost routing using only the
Internal table. To keep the dial plan as simple as possible, 3Com strongly
recommends that, you use only the Internal table for least cost routing.
Adding New
Dial Plan Tables
If you share the system with another company or group and want to
control calls differently at the two sites, you can add a fourth table.