LERG Routing Guide
 | This article needs additional citations for verification. (May 2018) |
The LERG Routing Guide is a data product for the telecommunications industry produced in the TruOps Telecom Routing Administration (TRA) product group of iconectiv, LLC, formerly named Telcordia, a division of Ericsson since 2012. The LERG is primarily used by telecommunications service providers operating in the North American Numbering Plan (NANP), which constitutes World Zone 1. This data supports the local exchange network of the NANP and identifies planning changes in the network. LERG was originally coined as the trademarked acronym for Local Exchange Routing Guide.
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.