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When a packet arrives out of order, it is generally discarded since it makes no sense to play it out of order. Specifically, packets are discarded when they arrive later than they can be held with their contiguous packets in the jitter buffer. Packet mis-order can occur when networks send individual packets over different routes. Network loadbalancing and re-routing due to congestion or other transient difficulties can also lead to packet mis-order.
Networks that show frequent packet mis-order problems will produce low voice quality.
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