Strict priority queuing (PQ) divides traffic into different queues. These queues are usually high, medium, normal, and low, based on traffic type. This form of queuing services the queues in order of priority, from high to low. If there is a packet in the high-priority queue, it will always be serviced before the queue manager services the lower-priority queues. With priority queuing, however, it is possible to starve out lower-priority flows if sufficient traffic enters the high-priority queue. This mechanism works very well for IP telephony traffic where IP telephony bearer and signaling are inserted in the high-priority queue but does not work as well for routine data traffic that is starved out in case of sufficient high-priority traffic.