A hub-based clearing house for interoperability of distinct unified communication systems is disclosed. According to one embodiment, a system comprises a database that stores configuration information for the system; an administrator module that maintains the configuration information; a federation server that is connected to a first unified communications system and a second unified communications system. The federation server comprises a first translator that translates a first formatted message received from the first unified communications system into a common language formatted message, a second translator that translates the common language formatted message into a second formatted message, and a routing engine that routes the second formatted message to the second unified communications system.