The routing of calls of different classes of services as well as the administration thereof is enhanced by associating each such class of service with a number of parameters common to such services, such that each class of service, as well as a new class of service, may be readily identified by its respective...http://www.google.de/patents/US5392344?utm_source=gb-gplus-sharePatent US5392344 - Communications network class-of-service routing
