What is LRN in telecom?

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In the telecommunications industry, LRN stands for Local Routing Number.  This number refers to a 10-digit numeric code that represents a switch or telephone port that houses several telephone numbers.  The main function of LRN is to allow telephone numbers to be transferred or re-routed to another location, carrier, or service provider without having to change it.  In cases wherein these circumstances are required, the telephone number remains the same while the LRN or local routing number will be altered to correspond to the change in location or telecoms carrier for example.

Local routing numbers are typically assigned specifically to a telecoms provider or carrier.  The LRN will then have to be changed in cases wherein the local or public telephone number is to be supported by another carrier.  The use of LRN is necessary so that telephone numbers will have the so-called LNP or local number portability.  With this feature, there is no hassle in terms of shifting from one telecoms provider to another carrier.  The telephone number will be retained while only the LRN will be changed.  This concept in fixed or landlines is also applicable to mobile numbers with their own version of portability called FMNP or full mobile number portability.  The use of LRN is mandated in the US back in 1996.  The basic premise was to avoid the hassle of having to change telephone numbers when switching networks or locations.  With LRN mandated to have portability features, telecom subscribers can have the same number or retain it regardless of location or carrier.

Aside from portability in terms of phone numbers, using LRN also provides support in terms of service and geographic or location portability.  With these features, transmission of telecom signals is made more efficient even if they are changed from basic to digital.  No location limitations are also encountered because of LRN’s geographic portability feature.

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