7.2  
Least Cost Routing (for U.S. Only) 
 

7.2.1  
Introduction 
 
This section explains the definitions and procedures used by the HiPath 3000 least cost routing (LCR) feature to control the path over which outgoing calls are routed to the public network.
The system analyzes each trunk call placed using least cost routing. If the digits are recognized, a reference route table is scanned for Route group choices. Once the Route group is selected, the availability of the route is checked against the time schedule. If the Route group is available, the LCR COS requirement assigned to the route group is compared to the LCR COS associated with the dialing device. If the LCR COS associated with the dialing station is equal to or greater than the route group COS, the Toll Restriction tables are checked for additional screening information.
The dialed call number is used as the criterion for the connection path to be used. The system can evaluate up to 24 digits of the digit sequence plus up to 9 field separators. The digit sequence that can be dialed can consist of up to 32 digits. The evaluation can be carried out both destination-dependently and time-dependently and in dependence on the station`s LCR class of service (COS).
General Operating Principle
The system analyzes the number dialed to determine if the digits entered are valid. If the digits are recognized, a reference route table is scanned for route group choices. Once the Route group is selected, the availability of the route is checked against the time schedule. If the Route group is available, the LCR COS requirement assigned to the route group is compared to the LCR COS associated with the dialing device. If the LCR COS associated with the dialing station is equal to or greater than the route group COS, the Toll Restriction tables are checked for additional screening information. This process is repeated for every call using the system LCR application.
The trunk group code is automatically cut off from the dialed digits if Least Cost Routing (LCR) is activated. The remaining digits are checked against the "Allowed list" and the "Denied list". For the configuration of Least Cost Routing, consider that the trunk group code is represented by the digits before the first separator (field E1).  
 Figure 7-3   General LCR Flow (for U.S. Only)
 
 •   A system-wide flag activates LCR via Assistant T or HiPath 3000 Manager E.
 •   When LCR is activated, the check is performed for every trunk seizure (except when dialing a trunk code).
 •   If all the least expensive connection routes have been seized, LCR automatically switches to defined more expensive routes. The user can be signaled of this fact both visually and acoustically.
 •   In the case of outgoing calls on the ISDN network, the dialed number continues to be displayed until the destination number information on the other party is received.
 •   Digits can be transmitted either per digit or en-bloc, depending on the access method and the dial plan.
 •   Once an account code is entered, it applies to the entire connection setup.
 •   The allowed and denied lists are also used for LCR. The toll restriction check then refers to the digits dialed on the station without the trunk group code.

HiPath 3000/5000 V9, Feature Description, Issue 10   up Top
Disclaimer & Copyright   ID: P31003H3590F100017618   2014-02-27