[Freeswitch-users] How to measure QOS?

Luis Daniel Lucio Quiroz luis.daniel.lucio at gmail.com
Wed Feb 25 16:16:57 MSK 2015


You shall try to void transcoding as much as possible
On Feb 25, 2015 2:54 AM, "Stanislav Sinyagin" <ssinyagin at gmail.com> wrote:

> 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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>
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>
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