IT and Telecom professionals have long been infatuated with the concept commonly referred to as QoS (which stands for Quality of Service). Of course ensuring that Voice over IP meets high voice quality requirements is a key concern when it comes to designing networks. New QoS protocols: Differentiated Services (DiffServ), the Label Distribution Protocol (LDP) and the once almost forgotten Resource Reservation Protocol (RSVP) have been designed by some of the brightest minds in IP networking and data processing.