Section 51.605 - Additional obligations of incumbent local exchange carriers(a) An incumbent LEC shall offer to any requesting telecommunications carrier any telecommunications service that the incumbent LEC offers on a retail basis to subscribers that are not telecommunications carriers for resale at wholesale rates that are, at the election of the state commission-(1) Consistent with the avoided cost methodology described in §§ 51.607 and 51.609 ; or(2) Interim wholesale rates, pursuant to § 51.611 .(b) For purposes of this subpart, exchange access services, as defined in section 3 of the Act, shall not be considered to be telecommunications services that incumbent LECs must make available for resale at wholesale rates to requesting telecommunications carriers.(c) For purposes of this subpart, advanced telecommunications services sold to Internet Service Providers as an input component to the Internet Service Providers' retail Internet service offering shall not be considered to be telecommunications services offered on a retail basis that incumbent LECs must make available for resale at wholesale rates to requesting telecommunications carriers.(d) Notwithstanding paragraph (b) of this section, advanced telecommunications services that are classified as exchange access services are subject to the obligations of paragraph (a) of this section if such services are sold on a retail basis to residential and business end-users that are not telecommunications carriers.(e) Except as provided in § 51.613 , an incumbent LEC shall not impose restrictions on the resale by a requesting carrier of telecommunications services offered by the incumbent LEC.61 FR 45619, Aug. 29, 1996, as amended at 65 FR 6915 , Feb. 11, 2000