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How LNP Works

Local Number Portability ( LNP ) is made technically feasible by the Location Routing Number (LRN), a unique 10-digit telephone number assigned to each switch. The LRN approach made it possible to introduce LNP without radically changing the Public Switched Telephone Network. It allowed the existing routing paradigm to remain in place, permitting a gradual conversion of the network to handle LNP traffic.