1. A method for assigning a plurality of peered border elements, 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 the peered border elements; and assigning the communication session to be handled by one of the peered border elements based on the composite Quality-of-Service result and the status of each of the peered border elements.