LRN Changes are caused by a variety of things:

• Switch replacement
• Code moves
• LERG Reassignments
• NPA Splits

As indicated earlier, since the switches use the LRN to route calls, these Signaling Network changes also have the potential to affect customer service.

Consequently, LRN changes must be coordinated between the CLECs and the Number Portability Administration Center (NPAC). To perform routing changes and mass updates using the Central Office Code (NXX) Assignment Guidelines Information; check the following website:

ATIS Document Center