scope:

PURPOSE AND SCOPE

This document specifies guidelines for the assignment of NXX codes within the 9YY Service Access Code (SAC) and Numbering Plan Area (NPA) to service providers (SPs).

For the purpose of these assignment guidelines, unique NXX codes will be utilized within the 9YY SAC to identify the individual carriers for routing purposes. A SAC is a non-geographic NPA or Easily Recognizable Code (ERC) used for the purpose of providing access to a specific type of service. ERCs are sometimes referred to as "NYY" codes to signify that N = digits 2-9 and YY = repeating digits 0-9.1

These guidelines are provided to accommodate a method which utilizes unique NXX codes within the 9YY SAC to identify individual SPs in order to allow multiple SPs 9YY access. This method requires an SP to 6-digit translate the 9YY NXX portion of a 9YY-NXX-XXXX2 number in order to identify the carrier for call routing. Consequently, the assignment of individual NXX codes to specific SPs is required. The 9YY SAC may be accessed by dialing (1)+9YY-NXXXXXX. 3 As an option, use of 0+9YY-NXX-XXXX dialing may also be allowed for 9YY access. Use of the 101XXXX Carrier Access Code prefix is not consistent with NXX assignment and routing and is therefore not permitted.

These guidelines were developed by the industry consensus process by the Industry Numbering Committee.

These guidelines are expected to apply throughout the NANP serving area subject to the appropriate regulatory or governmental procedures and constraints.