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The transmission of voice over IP networks can generate network congestion due to weak supervision of the traffic incoming packet, queuing and scheduling. This congestion negatively affects the Quality of Service (QoS) such as delay, packet drop and packet loss. Packet delay effects will affect the other QoS such as: Unstable voice packet delivery, packet jitter, packet loss and echo. Priority Queuing (PQ) algorithm is a more popular technique used in the VoIP network to reduce delays. In operation, the PQ is to use the method of sorting algorithms, search and route planning to classify packets on the router. Thus, this packet classifying method can result in repetition of the process. And this recursive loop leads to the next queue starved.
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