If a Customer has a Call Plan with more than one Rate Card, the Rate Card that contains the best Rate for a given destination will be selected by the Rate Engine. For example, consider the scenario were two different providers are present in the system offering different prices for the same country.

It is possible to force a Rate Card with independence of how good the rates are. The DNID Prefix and CALLERID Prefix can be used to force a Rate Card for a given number