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The support of QoS in the IP network is important to provide real-time applications like voice and video. But, the method in which the network uses to distinguish a real-time application and managing those service is one of the problem in supporting QoS in the IP network. The DiffServ is an efficient method of providing QoS capability without putting much burden to the network. The DiffServ architecture defines services in form of service level agreement (SLA), which is an agreement from the customer and service provider requesting differentiated service for the traffic to/from certain nodes. This paper presents a simple and practical method to provide flow based QoS service dynamically in the IP networks. The QoS controller manages the IP network to provide information for the real-time applications. Thus, the network can use that information to provide the needed QoS treatment for the pertaining flow.