Background
In 1996, the US Congress mandated a change in local telephone service that allows any carrier to enter a local market. The new regulation provides for local number portability (LNP), which means that when a consumer’s phone service is moved from one service provider to another, the telephone number (TN) does not change. This process is called porting a number. Every ported TN must have an LRN assigned to it. Individual TNs are mapped to an LRN (the mapping of TNs to an LRN is referred to as a ‘subscription’.)
Virginia-based NeuStar (acting as a neutral party) has been chartered with developing and maintaining the Number Portability Administration Center (NPAC) to support the implementation of Local Number Portability (LNP).
Read more about this topic: Local Routing Number
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