The Number Portability Administration Center (NPAC) is the system that supports the implementation of local number portability (LNP) and is used to facilitate number porting in the United States.
A key component to making number portability work is the Location Routing Number (LRN). The LRN is a unique 10-digit telephone number assigned to each service provider’s switch. By using the LRN in the port record, a telephone number is directed from the current service provider switch to the new service provider switch.
To facilitate porting, a service provider sends porting information, called “subscription version” information, to the NPAC. Service providers can do this directly or through a third-party entity known as a Service Bureau. There are three ways that this information can be exchanged, including a:
Once a ported number is activated, real-time network downloads are sent from the NPAC to the service provider’s or service bureau’s Local Service Management System (LSMS).