Using Least Cost Routing; Example Of Savings Using Least Cost Routing - Polycom ReadiManagerLX100 Administrator's Manual

Using Least Cost Routing

Example of Savings Using Least Cost Routing

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For enterprises that use gateways, Least cost routing (LCR) enables ISDN calls that
are made from inside an enterprise to be routed through the least expensive route.
Calls originating in one zone can be routed through a gateway residing on another zone
after referencing tables that indicate which will be the least costly route.
With Least Cost Routing, in addition to considering bandwidth, resources, and gateway
availability, Polycom ReadiManager LX100 also considers cost before determining the
route for a requested call. When calls are made, Polycom ReadiManager LX100
checks the LCR tables to determine if there is a least-cost route for a requested call,
and then routes the call to the appropriate gateway.
To take advantage of Least Cost Routing, you create Least Cost Routing tables (LCR
table) for each gateway in your video network. These tables provide information about
calls you place most frequently, including the required dialing strings and weighted
costs.
This section explains how Least Cost Routing works and how to set it up. It includes the
following topics:
Example of Savings Using Least Cost Routing
How Least Cost Routing Works
Example of Least Cost Routing
Determining What to Enter in LCR Tables
Setting Up Least Cost Routing
Creating Least Cost Routing Tables
Fields in the Least Cost Routing Table Form
The Least Routing algorithm utilizes the LCR tables defined and associated with
gateways to determine what route incurs the least cost for outbound calls.
For example, say Company XYZ has a network topology which includes the following:
Campus in San Francisco with a gateway and a ViaVideo
Campus in New York with a gateway
Company MNO in New York with a ViewStation deployed with native ISDN
If the ViaVideo in San Francisco called the ViewStation at Company MNO in New York
through a gateway in the San Francisco campus, the accrued cost could be high. If the
call lasted for 30 minutes and ISDN charges across the country were $2.00 per minute,
a 30 minute call would be $60.00.
If Least Cost Routing was configured with cost information entered, the call could be
successfully routed via the WAN Link between the two campuses for Company XYZ.
The routed call would then go out through the gateway in the New York campus. If the
cost were $0.10 per minute for a local ISDN phone call in the city of New York, the cost
Chapter 9 - Advanced Setup and Maintenance
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