Intelligent Indicators


The worst loss isn’t burst loss

Everybody knows that bursts of lost packets negatively impact speech quality of VoIP calls. The gaps in the packet stream directly translate to gaps in the audio. But there is an even worse form of packet loss.

Imagine a series of frequent but individual packet losses, e.g. packet lost, packet received, packet lost, packet received, etc. We call this pattern Critical Loss Density (CLD).

It’s clear that such a loss pattern is bad for speech quality, because loss concealment mechanisms – for example, replaying the last received packet – cannot mask a multitude of gaps stretching over time. This loss pattern is often caused by low level issues with network links such as old or broken fibers.

Qrystal is the only passive monitoring solution on the market that can detect CLD and identify the root cause.


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