From such sums as are from time to time made available by the Congress to the Secretary for such purpose, pursuant to section 903 of this title, the Secretary is authorized and empowered to make loans to persons now providing or who may hereafter provide telephone service in rural areas, to public bodies now providing telephone service in rural areas and to cooperative, nonprofit, limited dividend, or mutual associations. Except as otherwise provided by this subchapter, such loans shall be made under the same terms and conditions as are provided in section 904 of this title