Silence detection

From VoIPmonitor.org
Revision as of 18:04, 14 March 2019 by Festr (talk | contribs)
Jump to navigation Jump to search

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.

Cdr spectral silence example.png

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

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:

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.

Charts silence values.png

Retrieved from "https://www.voipmonitor.org//doc/index.php?title=Silence_detection&oldid=2383"