Silence detection

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Silence detection feature

VoIPmonitor is able to detect (currently only for G711a/b) silence in RTP streams. Silence threshold is hardcoded in the code (it is tolerant to a little noise). It must be enabled in voipmonitor.conf (silencedetect = yes). When enabled following metrics are produced:

  • Number of absolute silence audio frames (with 20ms length) which are treated as packet loss.

  • Percentage of silence in each direction of a call which will be shown in cdr detail

  • number of silence seconds from the end of the last RTP packet - this might be the reason why someone hanged up the call. If value is non zero it will be shown also in CDR summary:

  • Number of clipped frames - those are with the highest volume - perceived as audible clicks - this value is shown in cdr detail table. It can be filtered and used in charts

Data series in charts for silence, silence end and clipped frames.

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