CFR›Title 47›Chapter I›Part 51›Subpart B ContainsSection 51.100CorpusDaily eCFRDisplayed edition2026-05-28Last updated2026-05-28 Subpart B—Telecommunications Carriers Sections 51.100 § 51.100 General duty. Previous A Subpart A—General Information Next C Subpart C—Obligations of All Local Exchange Carriers