<div dir="ltr">These results are consistent with FS data in "/var/log/freeswitch/xml_cdr" files?<div><rtp_audio_in_mos>x.xx</rtp_audio_in_mos><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Apr 9, 2015 at 5:12 PM, Stanislav Sinyagin <span dir="ltr"><<a href="mailto:ssinyagin@gmail.com" target="_blank">ssinyagin@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I made 5 calls from each of 3 test servers (KVM at DigitalOcean in<br>
London, Scaleway physical in Paris, and a XEN host at <a href="http://softronics.ch" target="_blank">softronics.ch</a><br>
near Zurich), and the PESQ assessment tool shows varying results: for<br>
each host, the MOS score was fluctuating between 2.5 and 3.8.<br>
<br>
So, KVM doesn't seem to be too bad :-)<br>
<div class="HOEnZb"><div class="h5"><br>
<br>
<br>
<br>
On Thu, Apr 9, 2015 at 1:21 PM, Stanislav Sinyagin <<a href="mailto:ssinyagin@gmail.com">ssinyagin@gmail.com</a>> wrote:<br>
> thanks, the PESQ tool appears to be open-source and free for<br>
> non-commercial use, so I started a series of tests. I'll post an<br>
> update.<br>
> <a href="http://www.itu.int/rec/T-REC-P.862-200511-I!Amd2/en" target="_blank">http://www.itu.int/rec/T-REC-P.862-200511-I!Amd2/en</a><br>
><br>
><br>
><br>
> On Thu, Apr 9, 2015 at 12:36 PM, Jayanth Acharya <<a href="mailto:jayachar88@gmail.com">jayachar88@gmail.com</a>> wrote:<br>
>> See if this helps -<br>
>> <a href="http://www.voip-info.org/wiki/view/Call+Quality+Metrics" target="_blank">http://www.voip-info.org/wiki/view/Call+Quality+Metrics</a><br>
>> <a href="http://www.tamos.com/htmlhelp/voip-analysis/mosandr_factor.htm" target="_blank">http://www.tamos.com/htmlhelp/voip-analysis/mosandr_factor.htm</a><br>
>><br>
>><br>
>> On Thu, Apr 9, 2015 at 3:18 PM, Stanislav Sinyagin <<a href="mailto:ssinyagin@gmail.com">ssinyagin@gmail.com</a>><br>
>> wrote:<br>
>>><br>
>>> I made additional tests, and... I'm not sure any more. So, I removed<br>
>>> the statement about bad precision. This needs a lab environment with<br>
>>> predictable network and known CPU load on the host machine.<br>
>>><br>
>>> Does anyone know any tools that would automatically detect sound<br>
>>> distortions in WAV files and also find the shifts because of slipping<br>
>>> clock or lost frames? Up to now, the only tool I could find is<br>
>>> visually comparing the waves in Audacity.<br>
>>><br>
>>><br>
>>><br>
>>> On Sun, Apr 5, 2015 at 2:37 AM, Stanislav Sinyagin <<a href="mailto:ssinyagin@gmail.com">ssinyagin@gmail.com</a>><br>
>>> wrote:<br>
>>> > here we go:<br>
>>> ><br>
>>> > <a href="https://txlab.wordpress.com/2015/04/05/testing-rtp-clock-precision-on-a-virtual-machine/" target="_blank">https://txlab.wordpress.com/2015/04/05/testing-rtp-clock-precision-on-a-virtual-machine/</a><br>
>>> ><br>
>>> ><br>
>>> ><br>
>>> > On Sat, Apr 4, 2015 at 4:26 PM, Stanislav Sinyagin <<a href="mailto:ssinyagin@gmail.com">ssinyagin@gmail.com</a>><br>
>>> > wrote:<br>
>>> >> On Sat, Apr 4, 2015 at 1:03 PM, Regis M<br>
>>> >> <<a href="mailto:regis.freeswitch.org@tornad.net">regis.freeswitch.org@tornad.net</a>> wrote:<br>
>>> >>> How do you check wavs together in audacity ?<br>
>>> >><br>
>>> >> you just open two WAV files, align their starting position, and<br>
>>> >> visually check the waves. If there's a problem, you would see that<br>
>>> >> after few seconds, the waves are not aligned any more.<br>
>>> >><br>
>>> >>> Can you send me 2 samples wav (send... and recorded) so I could see<br>
>>> >>> the 20ms<br>
>>> >>> diff that you exposed...<br>
>>> >>><br>
>>> >>> Is there a way to automate the result checking, so it could help to<br>
>>> >>> monitor<br>
>>> >>> itsp quality<br>
>>> >><br>
>>> >> Here<br>
>>> >> <a href="https://github.com/openpreserve/scape-xcorrsound/issues/17" target="_blank">https://github.com/openpreserve/scape-xcorrsound/issues/17</a><br>
>>> >> this is a link to a tool which compares two sound files at the wave<br>
>>> >> level. You can also see the sound samples in the ticket.<br>
>>> >> The problem is, that currently this tool does not detect such slipping<br>
>>> >> frames.<br>
>>> >><br>
>>> >> I will also write a detailed article with examples, during the weekend.<br>
>>> >><br>
>>> >><br>
>>> >><br>
>>> >><br>
>>> >><br>
>>> >>><br>
>>> >>><br>
>>> >>> 2015-04-04 12:53 GMT+02:00 Stanislav Sinyagin <<a href="mailto:ssinyagin@gmail.com">ssinyagin@gmail.com</a>>:<br>
>>> >>>><br>
>>> >>>> Important is to send the media through two independent carriers -<br>
>>> >>>> then you<br>
>>> >>>> can be sure that your clock is compared against a high quality one.<br>
>>> >>>><br>
>>> >>>> On Apr 4, 2015 12:46 PM, "Regis M" <<a href="mailto:regis.freeswitch.org@tornad.net">regis.freeswitch.org@tornad.net</a>><br>
>>> >>>> wrote:<br>
>>> >>>>><br>
>>> >>>>> Hi,<br>
>>> >>>>><br>
>>> >>>>> It's a very interresting test and conclusion.<br>
>>> >>>>><br>
>>> >>>>> I will try to build a similar environnement on my freeswitch to<br>
>>> >>>>> check<br>
>>> >>>>> some system :)<br>
>>> >>>>><br>
>>> >>>>> thanks<br>
>>> >>>>><br>
>>> >>>>><br>
>>> >>>>><br>
>>> >>>>> 2015-04-04 2:16 GMT+02:00 Stanislav Sinyagin <<a href="mailto:ssinyagin@gmail.com">ssinyagin@gmail.com</a>>:<br>
>>> >>>>>><br>
>>> >>>>>> hi,<br>
>>> >>>>>><br>
>>> >>>>>> Here are some test results which might be interesting:<br>
>>> >>>>>><br>
>>> >>>>>> I've set up a test FreeSWITCH server at digitalocean (they use<br>
>>> >>>>>> KVM),<br>
>>> >>>>>> and originated test calls to some ITSP accounts. Each call played a<br>
>>> >>>>>> test sound file (voice samples from ITU:<br>
>>> >>>>>><br>
>>> >>>>>> <a href="http://www.itu.int/net/itu-t/sigdb/genaudio/AudioForm-g.aspx?val=1000050" target="_blank">http://www.itu.int/net/itu-t/sigdb/genaudio/AudioForm-g.aspx?val=1000050</a><br>
>>> >>>>>> ), and on the receiving end another FreeSWITCH server was recording<br>
>>> >>>>>> the received session. The receiving server was on a XEN VM. Both<br>
>>> >>>>>> servers talked G711 to their corresponding ITSP accounts.<br>
>>> >>>>>><br>
>>> >>>>>> Then I compared the source audio and received audio in Audacity<br>
>>> >>>>>> editor.<br>
>>> >>>>>><br>
>>> >>>>>> The tests showed that the received voice wave shifts 20ms from the<br>
>>> >>>>>> original sound every few seconds, randomly back and forward. This<br>
>>> >>>>>> skewing was always present, regardless of ITSP and time of day.<br>
>>> >>>>>><br>
>>> >>>>>> Then I moved the sending server to a XEN VM, and the waves appeared<br>
>>> >>>>>> almost perfectly synchronized (there was a 5ms skew in one test,<br>
>>> >>>>>> and I<br>
>>> >>>>>> guess it's related to transcoding buffer, as the sound was<br>
>>> >>>>>> obviously<br>
>>> >>>>>> transcoded).<br>
>>> >>>>>><br>
>>> >>>>>> The effect was always visible with a 30-second sample, and I also<br>
>>> >>>>>> made<br>
>>> >>>>>> additional tests with 2-minute samples.<br>
>>> >>>>>><br>
>>> >>>>>> It would also be interesting to test this from a VmWare VM. If<br>
>>> >>>>>> someone<br>
>>> >>>>>> wants to run such a test, feel free to contact me directly.<br>
>>> >>>>>><br>
>>> >>>>>><br>
>>> >>>>>> cheers,<br>
>>> >>>>>> stan<br>
>>> >>>>>><br>
>>> >>>>>><br>
>>> >>>>>><br>
>>> >>>>>> _________________________________________________________________________<br>
>>> >>>>>> Professional FreeSWITCH Consulting Services:<br>
>>> >>>>>> <a href="mailto:consulting@freeswitch.org">consulting@freeswitch.org</a><br>
>>> >>>>>> <a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
>>> >>>>>><br>
>>> >>>>>> Official FreeSWITCH Sites<br>
>>> >>>>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>> >>>>>> <a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
>>> >>>>>> <a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
>>> >>>>>><br>
>>> >>>>>> FreeSWITCH-users mailing list<br>
>>> >>>>>> <a href="mailto:FreeSWITCH-users@lists.freeswitch.org">FreeSWITCH-users@lists.freeswitch.org</a><br>
>>> >>>>>> <a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
>>> >>>>>><br>
>>> >>>>>> UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
>>> >>>>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>> >>>>><br>
>>> >>>>><br>
>>> >>>>><br>
>>> >>>>><br>
>>> >>>>> _________________________________________________________________________<br>
>>> >>>>> Professional FreeSWITCH Consulting Services:<br>
>>> >>>>> <a href="mailto:consulting@freeswitch.org">consulting@freeswitch.org</a><br>
>>> >>>>> <a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
>>> >>>>><br>
>>> >>>>> Official FreeSWITCH Sites<br>
>>> >>>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>> >>>>> <a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
>>> >>>>> <a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
>>> >>>>><br>
>>> >>>>> FreeSWITCH-users mailing list<br>
>>> >>>>> <a href="mailto:FreeSWITCH-users@lists.freeswitch.org">FreeSWITCH-users@lists.freeswitch.org</a><br>
>>> >>>>> <a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
>>> >>>>><br>
>>> >>>>> UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
>>> >>>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>> >>>><br>
>>> >>>><br>
>>> >>>><br>
>>> >>>> _________________________________________________________________________<br>
>>> >>>> Professional FreeSWITCH Consulting Services:<br>
>>> >>>> <a href="mailto:consulting@freeswitch.org">consulting@freeswitch.org</a><br>
>>> >>>> <a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
>>> >>>><br>
>>> >>>> Official FreeSWITCH Sites<br>
>>> >>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>> >>>> <a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
>>> >>>> <a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
>>> >>>><br>
>>> >>>> FreeSWITCH-users mailing list<br>
>>> >>>> <a href="mailto:FreeSWITCH-users@lists.freeswitch.org">FreeSWITCH-users@lists.freeswitch.org</a><br>
>>> >>>> <a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
>>> >>>><br>
>>> >>>> UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
>>> >>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>> >>><br>
>>> >>><br>
>>> >>><br>
>>> >>><br>
>>> >>> _________________________________________________________________________<br>
>>> >>> Professional FreeSWITCH Consulting Services:<br>
>>> >>> <a href="mailto:consulting@freeswitch.org">consulting@freeswitch.org</a><br>
>>> >>> <a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
>>> >>><br>
>>> >>> Official FreeSWITCH Sites<br>
>>> >>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>> >>> <a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
>>> >>> <a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
>>> >>><br>
>>> >>> FreeSWITCH-users mailing list<br>
>>> >>> <a href="mailto:FreeSWITCH-users@lists.freeswitch.org">FreeSWITCH-users@lists.freeswitch.org</a><br>
>>> >>> <a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
>>> >>><br>
>>> >>> UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
>>> >>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>><br>
>>> _________________________________________________________________________<br>
>>> Professional FreeSWITCH Consulting Services:<br>
>>> <a href="mailto:consulting@freeswitch.org">consulting@freeswitch.org</a><br>
>>> <a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
>>><br>
>>> Official FreeSWITCH Sites<br>
>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>> <a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
>>> <a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
>>><br>
>>> FreeSWITCH-users mailing list<br>
>>> <a href="mailto:FreeSWITCH-users@lists.freeswitch.org">FreeSWITCH-users@lists.freeswitch.org</a><br>
>>> <a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
>>> UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>><br>
>><br>
>><br>
>> _________________________________________________________________________<br>
>> Professional FreeSWITCH Consulting Services:<br>
>> <a href="mailto:consulting@freeswitch.org">consulting@freeswitch.org</a><br>
>> <a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
>><br>
>> Official FreeSWITCH Sites<br>
>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>> <a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
>> <a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
>><br>
>> FreeSWITCH-users mailing list<br>
>> <a href="mailto:FreeSWITCH-users@lists.freeswitch.org">FreeSWITCH-users@lists.freeswitch.org</a><br>
>> <a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
>> UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
<br>
_________________________________________________________________________<br>
Professional FreeSWITCH Consulting Services:<br>
<a href="mailto:consulting@freeswitch.org">consulting@freeswitch.org</a><br>
<a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
<br>
Official FreeSWITCH Sites<br>
<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
<a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
<a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
<br>
FreeSWITCH-users mailing list<br>
<a href="mailto:FreeSWITCH-users@lists.freeswitch.org">FreeSWITCH-users@lists.freeswitch.org</a><br>
<a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
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</div></div></blockquote></div><br></div>