A Local Routing Number (LRN) looks just like a telephone number to a switch that is using the LRN for call routing purposes. It is very important to understand your signaling requirements and the result of the Local Exchange Routing Guide (LERG) inputs to set up your networks appropriately for LNP.

This module will give you the information you need to prepare for LNP implementation.

The LERG is Telcordia Technology's document that identifies end offices and their relationship to Tandem offices.