The purpose of this subpart, as revised in 2011 by FCC 11-161 is to establish rules governing the transition of intercarrier compensation from a calling-party's-network pays system to a default bill-and-keep methodology. Following the transition, the exchange of telecommunications traffic between and among service providers will, by default, be governed by bill-and-keep arrangements.
47 C.F.R. §51.700
See FCC 11-161, figure 9 (chart identifying steps in the transition).