Sec.  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  Sec.  Sec. 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  Sec.  Sec. 51.505 and 51.511; or

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