PURPOSE AND SCOPE This document specifies guidelines for the assignment of NXX codes within the 9YY Service Access Code (SAC) to carriers. 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. These guidelines are provided to accommodate a method which utilizes unique NXX codes within the 9YY SAC to identify individual carriers in order to allow multiple carrier 9YY access. This method requires a Local Exchange Carrier (LEC) to 6-digit translate the 9YY NXX portion of a 9YY-NXX-XXXX number in order to identify the carrier for call routing. Consequently@ the assignment of individual NXX codes to specific carriers is required. The 9YY SAC may be accessed by dialing (1)+9YYNXX- XXXX.* 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. * This would not apply to those end user lines from which the subscriber has requested the blocking of all 9YY calls.