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June 15, 2009
LERG 7 and LERG 7 SHA
The Local Exchange Routing Guide (LERG) is a very useful tool for Auditing Usage. End Office audits require knowing the various capabilities of the End Office. You will also need to know the related switches (tandem, host, remote, actual switch, etc) for the End Office. LERG 7 and LERG 7 SHA are two tables that provide this essential information.
LERG 7 is a great tool for understanding the function of the switch you are auditing. I use this LERG to determine if a switch is a Class 4/5, a Host or a Remote. One can also determine if a switch has Wireless, 800 or Directory Assistance capability. And, of course, using the Vertical and Horizontal Coordinates, you can calculate the mileage between two Switches.
LERG 7 SHA helps one to understand the relationship between switches. After using LERG 7 to identify if a switch is a Host or Remote, you can use LERG 7 SHA to determine the actual 11 digit CLLI of the Host or Remote. I also use this LERG to see if other End Offices of a tandem have the same issue as the End Office I am disputing. Thus, understanding how an End Office relates to the other switches can help you not only narrow in on your issue at hand, but will also help you find more disputes.
Usage auditing can be complex and daunting. Understanding LERG and its various tables helps unwrap a degree of complexity. Having processes and tools in place that support and define these relationships puts you well on the way to successful auditing.
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