QoS is handled differently by each technology, including both the wireless access technologies and also IP, which has two QoS approaches, DiffServ and IntServ. Some technologies divide traffic into “Service Classes”, e.g. streaming, while others allow users to specify quantitative “QoS Parameters”, e.g. transfer delay. WiFi, Mobile-Fi and DiffServ use the service class approach and although they do not have exactly the same service classes, it is possible to make a correspondence among them. WiMAX and IntServ use the QoS parameter approach, and UMTS uses both approaches. Again correspondences among parameters can be made, .