3Com NBX 100 Installation Manual page 53

Table 7 Pre-defined Routes
Route Number
1
2
3
4
5
6
Other
Do not delete or modify any predefined routes. You can create new
routes.
Each device can use a Normal table and a Least Cost Routing table.
Telephones use the Internal Dial Plan table (table ID 1) as their normal Dial
Plan table, and the Least Cost Routing table (table ID 3) as their least cost
table.
If the Least Cost Routing table exists, it takes precedence over the Internal
table. If the NBX 100 tries to execute an entry in the Least Cost Routing
table, but can not, 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.
Description
Local CO (strip)
Local CO (no strip)
Voice Application (auto attendant on extension 500)
Attendant (person)
H.323 Gateway
Least Cost Route example
User-defined routes
Dial Plan Tables 53