This page formerly contained some of the Federal Communications Commission regulations relating to telephone numbering, excerpted from the Code of Federal Regulations, Title 47, Volume 3, Part 52, Subpart B (pages 52-55), revised as of October 1, 1997. However, those regulations have been amended substantially, so please go directly to the source for the updated version:
Please visit the National Archives Electronic Code of Federal Regulations, eCFR online, or go directly to 47 CFR 52 (B)