为了使延迟和抖动减到最小，网络设备必须能够在语音数据包一到达时就进行处理，换句话说，就是严格的优先级方式。
To minimize delay and jitter, the network devices must be able to service voice packets as soon as they arrive, or in other words, in strict priority fashion.
延迟是数据包从一个地点到另一个地点然后返回这一个来回所花费的时间(通常以毫秒计)。
Latency is the amount of time (usually measured in milliseconds) that a packet of data takes to get from one point to another and then back in a round trip.
数据包丢失或延迟到达情况下将启用阻塞控制，进一步限制性能以避免更多全局网络问题。
Packet loss, or late arrival, enables congestion control, which further limits performance to avoid more global networking issues.
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