1. A method for assigning a plurality of peered border elements, comprising: determining a composite Quality-of-Service parameter of a communication session based on weighting a plurality of Quality-of-Service parameters of the communication session including a grade of service parameter of the communication session and a traffic type parameter of the communication session, the grade of service parameter including an attempted performance range and an expected performance range of the communication session, the grade of service parameter being based on a level of service purchased for a device that is an endpoint of the communication session, and the traffic type parameter being defined by a type of application using the communication session; querying a telephone number mapping server for a status of each of the peered border elements; assigning the communication session to be handled by one of the peered border elements based on the composite Quality-of-Service parameter and the status of each of the peered border elements; and generating a Quality-of-Service authorization token to reserve network resources associated with the assigned one of the peered border elements.