Sec.  52.29   Cost recovery for transitional measures for number portability.

   Any cost recovery mechanism for the provision of number portability pursuant
   to  Sec. 52.7(a), that is adopted by a state commission must not:

   (a) Give one telecommunications carrier an appreciable, incremental cost
   advantage over another telecommunications carrier, when competing for a
   specific subscriber (i.e., the recovery mechanism may not have a disparate
   effect on the incremental costs of competing carriers seeking to serve the
   same customer); or

   (b) Have a disparate effect on the ability of competing telecommunications
   carriers to earn a normal return on their investment.