A system for selecting communication routes based on multiple criteria is disclosed. The system can dynamically update route ranking criteria without loading new data tables. Further, the system can be implemented in the context of a route ranking system that provides a list of routes for processing or completing a call. The list of routes can be generated in a ranked order to facilitate attempts to route the call based on the predefined routing criteria. Further, the route ranking system can determine the list of routes based on one or more criteria including, for example, margins, call type, and vendor ratings, to name a few. Advantageously, modifications can be made to values associated with the routing criteria without requiring the loading of new tables associated with the routing criteria. These modifications can be associated with an expiration condition thereby enabling increased flexibility in determining the list of routes.