Silence detection: Difference between revisions
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= Silence detection feature = | = Silence detection feature = | ||
VoIPmonitor is able to detect (currently only for G711a/b) silence in the | 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. | |||
[[File:cdr_spectral_silence_example.png]] | |||
* Percentage of silence in each direction of a call which will be shown in cdr detail | |||
[[File: | [[File:cdr_detail_silence_table.png]] | ||
* 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: | |||
[[File:cdr_summary_silence_example.png]] | |||
* 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. | Data series in charts for silence, silence end and clipped frames. | ||
[[File:charts_silence_values.png]] | [[File:charts_silence_values.png]] | ||
Revision as of 17:04, 14 March 2019
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.
