Abstract :
VoIP (Voice over IP) low price makes it is widely used in the Internet, the security of the subject is also highly regarded. VoIP encode voice signal and compression, packaged into IP packet form, and send packets using Internet, we appraise the performance, Determine the main cause of the majority of voice quality in network performance. Serious packet loss, and low network bandwidth, making VoIP communicate quality poorly. In this paper, we using NS2 simulation Voip, when it is attacked by Botnet Ddos, we observed the queue of the packet loss rate, and calculate the packet delay time, by the experiment data, we look forward to providing a stable of transmission quality in VoIP internet.
