Put forward a kind of passive mode based on flow analysis of VoIP voice quality assessment methods, in order to help VoIP carriers for the backbone of a large number of concurrent VoIP call quality session for real-time monitoring, on the basis of traffic acquisition, through tracking algorithm for VoIP session packet loss, delay the basic performance indicators such as; Through rapid assessment model for VoIP session R and MOS values calculated, experiments show that this method is high performance, the evaluation results are accurate,
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