Best Service Routing (BSR) is available with Avaya communication servers. BSR enables calls to be balanced at a single site or between multiple sites. BSR is enhanced multisite routing that provides call vectoring functions that build upon the Look-Ahead Interflow feature to route a call to the “best” split/skill on a single communication server or to the “best” split/skill in a network of communication servers. The “best” split/skill is defined as the local split/skill or remote split/skill that offers the shortest waiting time for the call in a call surplus (calls queued) situation for the application. The waiting time is calculated by using the Expected Wait Time (EWT) predictor of the communication server, and can be adjusted by the user. In a situation where agents are idle, the “best” split/skill is determined on the basis of the assigned available agent strategy. BSR data is tracked in the vector, VDN, and call history tables.