On Mon, Apr 6, 2015 at 4:39 AM, George Assaad <gassaad@emassembly.com> wrote:
Nobody mentioned OpenVZ, what about it? If anybody has any feedback?

OpenVZ (and "containers", LXC, ertc) is the preferred method for "virtualization" of FreeSWITCH.
It does not emulate an hardware layer, neither runs multiple kernels sharing (multiplexing) an hardware clock.
It runs directly on the iron, and has one only kernel, with real IRQs and timers.
As for timing, OpenVZ and LXC give you the same results as bare metal, eg best possible results.

-giovanni
 

On Sun, Apr 5, 2015 at 7:52 PM, Carlos Ruiz Díaz <carlos.ruizdiaz@gmail.com> wrote:
This makes me wonder whether to stick with DO or migrate to Amazon. 

Any advice on EC2 quality compared to DO?

On Sun, Apr 5, 2015 at 5:33 PM, Stanislav Sinyagin <ssinyagin@gmail.com> wrote:
I made additional tests by sending calls to sipgate.co.uk, and they confirm my results: when sending a call from my Xen server in Switzerland, the received audio is always perfect. But when sending from a Digitalocean host in Amsterdam, I get the slipping frames.

I will re-test again during a business day, when the servers are likely to be more busy.



On Sun, Apr 5, 2015 at 12:47 PM, Stanislav Sinyagin <ssinyagin@gmail.com> wrote:

Yrs, jitter buffer was enabled. Here I'm pretty sure that we deal with the clock skew.

On Apr 5, 2015 12:07 PM, "Brian West" <brian@freeswitch.org> wrote:
Correct me if I'm wrong but is sounds like you've described jitter.  Did you test with the jitter buffer enabled?

On Sunday, April 5, 2015, Regis M <regis.freeswitch.org@tornad.net> wrote:
nice work !!!  Thanks for sharing.



2015-04-05 2:37 GMT+02:00 Stanislav Sinyagin <ssinyagin@gmail.com>:
here we go:
https://txlab.wordpress.com/2015/04/05/testing-rtp-clock-precision-on-a-virtual-machine/



On Sat, Apr 4, 2015 at 4:26 PM, Stanislav Sinyagin <ssinyagin@gmail.com> wrote:
> On Sat, Apr 4, 2015 at 1:03 PM, Regis M <regis.freeswitch.org@tornad.net> wrote:
>> How do you check wavs together in audacity ?
>
> you just open two WAV files, align their starting position, and
> visually check the waves. If there's a problem, you would see that
> after few seconds, the waves are not aligned any more.
>
>> Can you send me 2 samples wav (send... and recorded) so I could see the 20ms
>> diff that you exposed...
>>
>> Is there a way to automate the result checking, so it could help to monitor
>> itsp quality
>
> Here
> https://github.com/openpreserve/scape-xcorrsound/issues/17
> this is a link to a tool which compares two sound files at the wave
> level. You can also see the sound samples in the ticket.
> The problem is, that currently this tool does not detect such slipping frames.
>
> I will also write a detailed article with examples, during the weekend.
>
>
>
>
>
>>
>>
>> 2015-04-04 12:53 GMT+02:00 Stanislav Sinyagin <ssinyagin@gmail.com>:
>>>
>>> Important is to send the media through two independent carriers - then you
>>> can be sure that your clock is compared against a high quality one.
>>>
>>> On Apr 4, 2015 12:46 PM, "Regis M" <regis.freeswitch.org@tornad.net>
>>> wrote:
>>>>
>>>> Hi,
>>>>
>>>> It's a very interresting test and conclusion.
>>>>
>>>> I will try to build a similar environnement on my freeswitch to check
>>>> some system :)
>>>>
>>>> thanks
>>>>
>>>>
>>>>
>>>> 2015-04-04 2:16 GMT+02:00 Stanislav Sinyagin <ssinyagin@gmail.com>:
>>>>>
>>>>> hi,
>>>>>
>>>>> Here are some test results which might be interesting:
>>>>>
>>>>> I've set up a test FreeSWITCH server at digitalocean (they use KVM),
>>>>> and originated test calls to some ITSP accounts. Each call played a
>>>>> test sound file (voice samples from ITU:
>>>>> http://www.itu.int/net/itu-t/sigdb/genaudio/AudioForm-g.aspx?val=1000050
>>>>> ), and on the receiving end another FreeSWITCH server was recording
>>>>> the received session. The receiving server was on a XEN VM. Both
>>>>> servers talked G711 to their corresponding ITSP accounts.
>>>>>
>>>>> Then I compared the source audio and received audio in Audacity editor.
>>>>>
>>>>> The tests showed that the received voice wave shifts 20ms from the
>>>>> original sound every few seconds, randomly back and forward. This
>>>>> skewing was always present, regardless of ITSP and time of day.
>>>>>
>>>>> Then I moved the sending server to a XEN VM, and the waves appeared
>>>>> almost perfectly synchronized (there was a 5ms skew in one test, and I
>>>>> guess it's related to transcoding buffer, as the sound was obviously
>>>>> transcoded).
>>>>>
>>>>> The effect was always visible with a 30-second sample, and I also made
>>>>> additional tests with 2-minute samples.
>>>>>
>>>>> It would also be interesting to test this from a VmWare VM. If someone
>>>>> wants to run such a test, feel free to contact me directly.
>>>>>
>>>>>
>>>>> cheers,
>>>>> stan
>>>>>
>>>>>
>>>>> _________________________________________________________________________
>>>>> Professional FreeSWITCH Consulting Services:
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>>>>>
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>>>>
>>>>
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>>>>
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>>
>>
>> _________________________________________________________________________
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>>
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_________________________________________________________________________
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--

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_________________________________________________________________________
Professional FreeSWITCH Consulting Services:
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Official FreeSWITCH Sites
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http://confluence.freeswitch.org
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_________________________________________________________________________
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http://www.freeswitchsolutions.com

Official FreeSWITCH Sites
http://www.freeswitch.org
http://confluence.freeswitch.org
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--

_________________________________________________________________________
Professional FreeSWITCH Consulting Services:
consulting@freeswitch.org
http://www.freeswitchsolutions.com

Official FreeSWITCH Sites
http://www.freeswitch.org
http://confluence.freeswitch.org
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http://www.freeswitch.org


_________________________________________________________________________
Professional FreeSWITCH Consulting Services:
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http://www.freeswitchsolutions.com

Official FreeSWITCH Sites
http://www.freeswitch.org
http://confluence.freeswitch.org
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--
Sincerely,

Giovanni Maruzzelli
Cell : +39-347-2665618