# LERG Routing Guide

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/LERG_Routing_Guide
> Markdown URL: https://mediated.wiki/source/LERG_Routing_Guide.md
> Source: https://en.wikipedia.org/wiki/LERG_Routing_Guide
> Source revision: 1178293560
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{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](/source/North_American_Numbering_Plan) (NANP) by the [NANP administrator](/source/North_American_Numbering_Plan_Administrator) (NANPA) and [telecommunications service provider](/source/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](/source/Federal_Communications_Commission) (FCC) to perform the NANPA function.

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

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

<!--  This is just a verbatim copy from a copyrighted document, reproducing it without explanation is not encyclopedic
Components include:
* Operating company numbers (OCNs), company names, routing contacts
* [Country code](/source/Country_code) assignments 
* Numbering Plan Area (NPA) code assignments ([area codes](/source/area_codes)) 
* [Local access and transport area](/source/Local_access_and_transport_area) (LATA) codes 
* Destination code assignments (NPA NXX thousands-blocks) 
* [Access tandem](/source/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](/source/access_tandem) codes (ATCs) 
* [Location Routing Number](/source/Location_Routing_Number)s (LRNs)
-->
==See also==
* [Routing in the PSTN](/source/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

---
Adapted from the Wikipedia article [LERG Routing Guide](https://en.wikipedia.org/wiki/LERG_Routing_Guide) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/LERG_Routing_Guide?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.