Delivering quality voice over the network requires all packets sent to arrive in a timely fashion. If packets are delivered out of order for any reason then this can cause the speech quality to decline. For example if a packet for the beginning of a sentence arrives in the middle sentence then it is likely that the packet will be too late for acceptable usage and will be discarded. The extent of the quality loss will depend on how many packets are out of order, early or late, and as a results become unusable in the context of uniform speech.
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