Under the condition of complicated background traffics, how to maintain the Quality of Services (QoS) of VoIP is a hotspot in recent research.
如何在网络流量背景复杂的情况下保证因特网电话的服务质量是当前的一个研究热点。
The key techniques of VOIP include signaling, encoding, Real-time transmission, QOS and so on.
由于VOIP的关键技术包括信令技术、编码技术、实时传输技术、服务质量（QOS）保证技术等。
WAN QoS: There are several methods for improving the WAN QoS. Most VoIP products support DiffServ (Differentiated Services).
广域网服务质量：有几种方法可以改进广域网的服务质量。
WAN QoS: There are several methods for improving the WAN QoS. Most VoIP products support DiffServ (Differentiated Services).
广域网服务质量：有几种方法可以改进广域网的服务质量。
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