There are plenty of factors that come together for a quality sounding voice over ip call. I have outlined some of the more of the specific issues below. There are plenty of other various reasons, but these are the ingredients that make a quality voip call.
Packet Jitter is the variation of a periodic signal, such as a ping. It represents the variation in times that packets arrive, and not the time it takes a packet to arrive. We want jitter to be low and consistent, which represents reliable, predictable, packet traffic.
Packet Loss occurs when a sent packet fails to reach its destination, which can require a resending of that packet. It is one of the three identified main error types which occur in digital communication. Causes vary, but often signal degradation, oversaturated network links, corrupted packets rejected in-transit, faulty networking hardware, faulty network drivers or normal routing routines are identified as the culprit.
Mean Opinion Score:
Mean Opinion Score is a number from 1 to 5 which is applied to data that has been compressed and then uncompressed. It is used to determine the quality of things like voice or video after transmission.
Application speed (Line Speed) is a measure of the total actual throughput of lines, minus things like packet loss, or other qualitative measures that can reduce throughput. Keep in mind that most broadband vendors sell bandwidth based upon a “typical usage” network configuration, so down speeds and up speeds can differ by a considerable amount.
Quality of Service:
Quality of services is a value from 0% to 100% that represents the consistency of line speed. The more consistent the line speed, the higher the number.
Round Trip Time:
Round Trip Time is the time it takes a single packet to be sent from the client to the server and then back to the client, and is a good indicator of connection path quality. What you want to see here is a pretty consistent value, with very small deviations.
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