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
The North American Numbering Plan (NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the international callin ...
(NANP) by the
NANP administrator (NANPA) and
telecommunications service provider
Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that fe ...
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
The Federal Communications Commission (FCC) is an independent agency of the United States federal government that regulates communications by radio, television, wire, satellite, and cable across the United States. The FCC maintains jurisdiction ...
(FCC) to perform the NANPA function.
The database is produced in the ''TruOps Telecom Routing Administration'' (TRA) product group of
iconectiv, LLC, formerly named
Telcordia
iconectiv is a supplier of network planning and network management services to telecommunications providers. Known as Bellcore after its establishment in the United States in 1983 as part of the break-up of the Bell System, the company's name ...
, a division of
Ericsson
(lit. "Telephone Stock Company of LM Ericsson"), commonly known as Ericsson, is a Swedish multinational networking and telecommunications company headquartered in Stockholm. The company sells infrastructure, software, and services in informat ...
since 2012.
Content and purpose
The LERG provides data to support the routing of
telephone
A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice, into e ...
calls by service providers in the
public switched telephone network
The public switched telephone network (PSTN) provides Communications infrastructure, infrastructure and services for public Telecommunications, telecommunication. The PSTN is the aggregate of the world's circuit-switched telephone networks that ...
(PSTN) and the interconnection points of the PSTN with
Internet Protocol
The Internet Protocol (IP) is the network layer communications protocol in the Internet protocol suite for relaying datagrams across network boundaries. Its routing function enables internetworking, and essentially establishes the Internet.
IP h ...
(IP) networks.
See also
*
Routing in the PSTN
Routing in the PSTN is the process of forwarding telephone calls between the constituent telephone networks that comprise the public switched telephone network (PSTN).
Telephone calls are routed across a network of potentially many switching sy ...
External links
* {{cite web , url=https://iconectiv.com/truops/telecom-routing-administration, title=TruOps Telecom Routing Administration (TRA) Overview
Telecom Routing Administration (part of iconectiv) LERGTruOps Telecom Routing Administration (TRA) LERG™ Routing Guide General Information
Telephone numbers