[Freeswitch-users] How to measure QOS?

[Stanislav Sinyagin]

I'd say QoS drops even more abruptly if you hit the bandwidth or
performance limits.

tshark, a text terminal version of Wireshark, can analyze the quality of
RTP streams and print a report that you can parse. Keep in mind that the
analysis itself is quite CPU-intensive, so what I usually do is collect the
RTP streams with tcpdump, and then run tshark in low-priority mode.

Here in scripts/ you can find a simple script that launches tshark and
analyses the output:
https://github.com/voxserv/voip_qos_probe

There is also a library for comparing WAV streams -- this would be the best
for QoS measurements, and you would also be able to get the PSTN path into
the test. But I didn't yet try it, as the customer was satisfied with RTP
analysis:
http://openpreservation.org/knowledge/blogs/2012/07/09/xcorrsound-waveform-compare-new-audio-quality-assurance-tool/
https://github.com/openpreserve/scape-xcorrsound

I hope this helps :)






On Wed, Feb 25, 2015 at 1:35 AM, Andrew V <avstarventures at gmail.com> wrote:

> How do you measure quality of service across all calls?
> What are ways to avoid bad quality of service?
> Say the call volume is in your control.
> Is it as easy as not letting the call volume get out of control?
> The attached is a hypothesis of the relationship between QOS and the
> number of concurrent calls.  Does it work that way?
> What other factors need to be taken into account?
>
> [image: Inline image 1]
>
>
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