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Measuring Voice Quality in a VoIP environment May 1, 2009

Posted by HubTechInsider in Telecommunications, Uncategorized.
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One of the consequences of installing Voice over IP systems is that the “voice” sides of information technology departments are learning the lingo and technology of measuring voice quality on data networks. In addition, staffs that manage data networks are becoming aware of the criticality of voice. They are developing a cognizance of the impact on voice services of congestion when they add new applications. They also note lost voice service when they take down the network for maintenance or new installations.

Staff use network management tools that entail quality of service assesments to monitor the following factors in voice quality:

* Packet loss refers to the network dropping packets when there is congestion. Packet loss results in uneven voice quality. Voice conversations “break up” when packet loss is too high.

* Latency refers to delays when voice packets transverse the network. Latency is measured in milliseconds. It results in long pauses within conversations and clipped words.

* Jitter is uneven latency and packet loss resulting in noisy calls that contain pops and clicks or crackling sounds.

* Echo, hearing your voice repeated, is often caused when voice is translated from a circuit switched format to the IP format. This is usually corrected by special echo-canceling devices.

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