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Due to human perception, VoIP is much more sensitive to certain network conditions that are considered well within spec for most applications. Network issues such as packet loss, jitter, and packet sequence errors are inherent to IP networks, and are well corrected and tolerated by data transfer protocols. Voice transmissions are real-time by the nature; hence the different approach to handling the network issues. Packet loss, jitter and out-of-order packets are tied closely to each other. Taking care of a single network issue can often reduce all three problems and significantly improve the quality of voice calls.
This chapter discusses network issues that affect the perceptual quality of VoIP calls.
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