[Freeswitch-users] How to measure QOS?

[Stanislav Sinyagin]

by the way, here are freely available test speech samples:

http://www.voiptroubleshooter.com/open_speech/
http://www.pscr.gov/projects/audio_quality/mrt_library/mrt_library2.php
http://alt-usage-english.org/audio_archive.shtml
http://www.itu.int/net/itu-t/sigdb/menu.aspx
http://www.voxforge.org/




On Wed, Feb 25, 2015 at 8:33 AM, Stanislav Sinyagin <ssinyagin at gmail.com>
wrote:

> 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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>
>
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