[Code of Federal Regulations] [Title 47, Volume 3] [Revised as of October 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 47CFR52.29] [Page 89] TITLE 47--TELECOMMUNICATION CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) PART 52_NUMBERING--Table of Contents Subpart C_Number Portability 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.