47 CFR § 64.1801
Geographic rate averaging and rate integration
February 16, 2021
(a) The rates charged by providers of interexchange telecommunications services to subscribers in rural and high-cost areas shall be no higher than the rates charged by each such provider to its subscribers in urban areas.
(b) A provider of interstate interexchange telecommunications services shall provide such services to its subscribers in each U.S. state at rates no higher than the rates charged to its subscribers in any other state.
[61 FR 42564, Aug. 16, 1996]