Editing LERG Routing Guide

{{Short description|Database of telecommunications}}
{{More citations needed|date=May 2018}}
The '''Local Exchange Routing Guide''' ('''LERG''') is a database of telecommunications numbering resources for use in the administration and operation of the [[North American Numbering Plan]] (NANP) by the [[North American Numbering Plan Administrator|NANP administrator]] (NANPA) and [[telecommunications service provider]]s. This data supports the local exchange network of the NANP and identifies planning changes in the network.

The database has been maintained by private sector entities assigned by the [[Federal Communications Commission]] (FCC) to perform the NANPA function.

The database is produced in the ''TruOps Telecom Routing Administration'' (TRA) product group of [[iconectiv|iconectiv, LLC]], formerly named [[Telcordia]], a division of [[Ericsson]] since 2012.

==Content and purpose==
The LERG provides data to support the routing of [[telephone]] calls by service providers in the [[public switched telephone network]] (PSTN) and the interconnection points of the PSTN with [[Internet Protocol]] (IP) networks. 

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Components include:
* Operating company numbers (OCNs), company names, routing contacts
* [[Country code]] assignments 
* Numbering Plan Area (NPA) code assignments ([[area codes]]) 
* [[Local access and transport area]] (LATA) codes 
* Destination code assignments (NPA NXX thousands-blocks) 
* [[Access tandem]] codes 
* Special NXX prefixes (e.g. 911, 976) 
* Switching entity record detail (e.g. equipment type, V&H coordinates), including PSTN and IP network elements 
* Rate center details (e.g. V&H coordinates) and localities (includes county and postal codes (US) of localities) 
* Switch homing arrangements (tandem and other switch-to-switch interconnections) 
* Operator [[access tandem]] codes (ATCs) 
* [[Location Routing Number]]s (LRNs)
-->
==See also==
* [[Routing in the PSTN]]

==External links==
* {{cite web |url=https://iconectiv.com/truops/telecom-routing-administration|title=TruOps Telecom Routing Administration (TRA) Overview}} 
* [http://www.trainfo.com/products_services/tra/catalog_details.html#LERG Telecom Routing Administration (part of iconectiv) LERG]
* [http://www.trainfo.com/products_services/tra/downloads/lerginfo.pdf TruOps Telecom Routing Administration (TRA) LERG™ Routing Guide General Information]

[[Category:Telephone numbers]]