§  51.503   General pricing standard.

   (a) An incumbent LEC shall offer elements to requesting
   telecommunications carriers at rates, terms, and conditions that are
   just, reasonable, and nondiscriminatory.

   (b) An incumbent LEC's rates for each element it offers shall comply
   with the rate structure rules set forth in § § 51.507 and 51.509, and
   shall be established, at the election of the state commission--

   (1) Pursuant to the forward-looking economic cost-based pricing
   methodology set forth in § § 51.505 and 51.511; or

   (2) Consistent with the proxy ceilings and ranges set forth in
   § 51.513.

   (c) The rates that an incumbent LEC assesses for elements shall not
   vary on the basis of the class of customers served by the requesting
   carrier, or on the type of services that the requesting carrier
   purchasing such elements uses them to provide.