Systems and methods to select peered border elements for a communication session based on Quality-of-Service are disclosed. In particular, an example method for peered border element assignment is disclosed, comprising determining a composite Quality-of-Service result based on a plurality of Quality-of-Service parameters associated with a communication session, querying a telephone number mapping server for a status of each of a plurality of peered border elements, and assigning the communication session to be handled by one of the plurality of peered border elements based on the composite Quality-of-Service result and the status of each of the plurality of peered border elements.