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LERG Routing Guide

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The Telcordia LERG Routing Guide is a comprehensive data product produced monthly by the Telcordia Routing Administration (TRA). It is primarily used by telecommunications service providers operating within the North American Numbering Plan (NANP), which is World Zone 1. This data supports the local exchange network of the NANP and identifies planning changes in the network. The acronym LERG originally stood for Local Exchange Routing Guide, and is a trademarked term of Telcordia Technologies, Inc., 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. It supports a wide range of business needs of companies that require information about the network, numbering, and other related information.

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 Numbers (LRNs)

See also

  • "Telcordia LERG Routing Guide Overview". Archived from the original on 2012-02-07.
  • Telecom Routing Administration (part of iconectiv) LERG
  • Common Interest Group on Routing and Rating (August 24, 2015). "LERG™ Routing Guide Educational Document". Telcordia Technologies, Inc. (dba "iconectiv"). Archived from the original on February 10, 2017. Retrieved May 9, 2018. This document is intended as a reference providing an overview of the LERG Routing Guide. The LERG Routing Guide provides data obtained from the iconectiv Business Integrated Routing and Rating Database System (BIRRDS) into which data is entered by Service Providers (SPs) and/or their agents. The LERG Routing Guide is comprised of files, each of which focuses on different aspects of the data. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
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