[Freeswitch-users] KVM vs. XEN virtualization

Wed Apr 8 00:19:33 MSD 2015

Thanks for the advice
On Apr 7, 2015 3:45 PM, "Giovanni Maruzzelli" <gmaruzz at gmail.com> wrote:

>
>
> On Tue, Apr 7, 2015 at 10:01 PM, Victor Medina <victor.medina at cibersys.com
> > wrote:
>
>> No fax so far. Planned.
>> Ubuntu. Lts.
>>
> if you can use T38, probably no problems (T38 was made for overcoming this
> kind of problems).
>
> If you must try with g711 alone, probably lot of frustrations (faxes are
> so much more sensitive to this kind of problems you probably end up with a
> low success rate).
>
> -giovanni
>
>
>
>> El 07/04/2015 15:26, "Brian West" <brian at freeswitch.org> escribió:
>>
>>> Do you happen to do faxing on EC2?  Also what distro do you run on your
>>> instances?
>>>
>>> On Tue, Apr 7, 2015 at 2:22 PM, Victor Medina <
>>> victor.medina at cibersys.com> wrote:
>>>
>>>> Price aside... we have no issues so far with Amazon. Carlos.
>>>>
>>>> 2015-04-05 19:22 GMT-04:30 Carlos Ruiz Díaz <carlos.ruizdiaz at gmail.com>
>>>> :
>>>>
>>>> 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 at 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 at 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 at 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 at tornad.net>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> nice work !!!  Thanks for sharing.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> 2015-04-05 2:37 GMT+02:00 Stanislav Sinyagin <ssinyagin at 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 at gmail.com> wrote:
>>>>>>>>>> > On Sat, Apr 4, 2015 at 1:03 PM, Regis M <
>>>>>>>>>> regis.freeswitch.org at 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 at 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 at 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 at 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:
>>>>>>>>>> >>>>> consulting at freeswitch.org
>>>>>>>>>> >>>>> http://www.freeswitchsolutions.com
>>>>>>>>>> >>>>>
>>>>>>>>>> >>>>> Official FreeSWITCH Sites
>>>>>>>>>> >>>>> http://www.freeswitch.org
>>>>>>>>>> >>>>> http://confluence.freeswitch.org
>>>>>>>>>> >>>>> http://www.cluecon.com
>>>>>>>>>> >>>>>
>>>>>>>>>> >>>>> FreeSWITCH-users mailing list
>>>>>>>>>> >>>>> FreeSWITCH-users at lists.freeswitch.org
>>>>>>>>>> >>>>>
>>>>>>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>>>>>> >>>>> UNSUBSCRIBE:
>>>>>>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>>>>>>> >>>>> http://www.freeswitch.org
>>>>>>>>>> >>>>
>>>>>>>>>> >>>>
>>>>>>>>>> >>>>
>>>>>>>>>> >>>>
>>>>>>>>>> _________________________________________________________________________
>>>>>>>>>> >>>> Professional FreeSWITCH Consulting Services:
>>>>>>>>>> >>>> consulting at freeswitch.org
>>>>>>>>>> >>>> http://www.freeswitchsolutions.com
>>>>>>>>>> >>>>
>>>>>>>>>> >>>> Official FreeSWITCH Sites
>>>>>>>>>> >>>> http://www.freeswitch.org
>>>>>>>>>> >>>> http://confluence.freeswitch.org
>>>>>>>>>> >>>> http://www.cluecon.com
>>>>>>>>>> >>>>
>>>>>>>>>> >>>> FreeSWITCH-users mailing list
>>>>>>>>>> >>>> FreeSWITCH-users at lists.freeswitch.org
>>>>>>>>>> >>>>
>>>>>>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>>>>>> >>>> UNSUBSCRIBE:
>>>>>>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>>>>>>> >>>> http://www.freeswitch.org
>>>>>>>>>> >>>
>>>>>>>>>> >>>
>>>>>>>>>> >>>
>>>>>>>>>> _________________________________________________________________________
>>>>>>>>>> >>> Professional FreeSWITCH Consulting Services:
>>>>>>>>>> >>> consulting at freeswitch.org
>>>>>>>>>> >>> http://www.freeswitchsolutions.com
>>>>>>>>>> >>>
>>>>>>>>>> >>> Official FreeSWITCH Sites
>>>>>>>>>> >>> http://www.freeswitch.org
>>>>>>>>>> >>> http://confluence.freeswitch.org
>>>>>>>>>> >>> http://www.cluecon.com
>>>>>>>>>> >>>
>>>>>>>>>> >>> FreeSWITCH-users mailing list
>>>>>>>>>> >>> FreeSWITCH-users at lists.freeswitch.org
>>>>>>>>>> >>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>>>>>> >>> UNSUBSCRIBE:
>>>>>>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>>>>>>> >>> http://www.freeswitch.org
>>>>>>>>>> >>
>>>>>>>>>> >>
>>>>>>>>>> >>
>>>>>>>>>> >>
>>>>>>>>>> _________________________________________________________________________
>>>>>>>>>> >> Professional FreeSWITCH Consulting Services:
>>>>>>>>>> >> consulting at freeswitch.org
>>>>>>>>>> >> http://www.freeswitchsolutions.com
>>>>>>>>>> >>
>>>>>>>>>> >> Official FreeSWITCH Sites
>>>>>>>>>> >> http://www.freeswitch.org
>>>>>>>>>> >> http://confluence.freeswitch.org
>>>>>>>>>> >> http://www.cluecon.com
>>>>>>>>>> >>
>>>>>>>>>> >> FreeSWITCH-users mailing list
>>>>>>>>>> >> FreeSWITCH-users at lists.freeswitch.org
>>>>>>>>>> >> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>>>>>> >> UNSUBSCRIBE:
>>>>>>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>>>>>>> >> http://www.freeswitch.org
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> _________________________________________________________________________
>>>>>>>>>> Professional FreeSWITCH Consulting Services:
>>>>>>>>>> consulting at freeswitch.org
>>>>>>>>>> http://www.freeswitchsolutions.com
>>>>>>>>>>
>>>>>>>>>> Official FreeSWITCH Sites
>>>>>>>>>> http://www.freeswitch.org
>>>>>>>>>> http://confluence.freeswitch.org
>>>>>>>>>> http://www.cluecon.com
>>>>>>>>>>
>>>>>>>>>> FreeSWITCH-users mailing list
>>>>>>>>>> FreeSWITCH-users at lists.freeswitch.org
>>>>>>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>>>>>> UNSUBSCRIBE:
>>>>>>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>>>>>>> http://www.freeswitch.org
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>>
>>>>>>>> *Brian West*
>>>>>>>> brian at freeswitch.org
>>>>>>>>
>>>>>>>>
>>>>>>>> *Twitter: @FreeSWITCH , @briankwest*
>>>>>>>> http://www.freeswitchbook.com
>>>>>>>> http://www.freeswitchcookbook.com
>>>>>>>>
>>>>>>>> ClueCon 2015 Call for Speakers
>>>>>>>> <https://www.cluecon.com/call-for-speakers/> | Register
>>>>>>>> <https://freeswitch.com/cart.php?gid=1> TODAY! | Reddit:
>>>>>>>> /r/freeswitch <https://www.reddit.com/r/freeswitch>
>>>>>>>>
>>>>>>>> *T:*+19184209001 | *F:*+19184209002 | *M:*+1918424WEST (9378)
>>>>>>>> *iNUM:*+883 5100 1420 9001 | *ISN:*410*543 | *Skype:*briankwest
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> _________________________________________________________________________
>>>>>>>> Professional FreeSWITCH Consulting Services:
>>>>>>>> consulting at freeswitch.org
>>>>>>>> http://www.freeswitchsolutions.com
>>>>>>>>
>>>>>>>> Official FreeSWITCH Sites
>>>>>>>> http://www.freeswitch.org
>>>>>>>> http://confluence.freeswitch.org
>>>>>>>> http://www.cluecon.com
>>>>>>>>
>>>>>>>> FreeSWITCH-users mailing list
>>>>>>>> FreeSWITCH-users at lists.freeswitch.org
>>>>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>>>> UNSUBSCRIBE:
>>>>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>>>>> http://www.freeswitch.org
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> _________________________________________________________________________
>>>>>> Professional FreeSWITCH Consulting Services:
>>>>>> consulting at freeswitch.org
>>>>>> http://www.freeswitchsolutions.com
>>>>>>
>>>>>> Official FreeSWITCH Sites
>>>>>> http://www.freeswitch.org
>>>>>> http://confluence.freeswitch.org
>>>>>> http://www.cluecon.com
>>>>>>
>>>>>> FreeSWITCH-users mailing list
>>>>>> FreeSWITCH-users at lists.freeswitch.org
>>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>> UNSUBSCRIBE:
>>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>>> http://www.freeswitch.org
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Carlos
>>>>> http://caruizdiaz.com
>>>>>
>>>>>
>>>>> _________________________________________________________________________
>>>>> Professional FreeSWITCH Consulting Services:
>>>>> consulting at freeswitch.org
>>>>> http://www.freeswitchsolutions.com
>>>>>
>>>>> Official FreeSWITCH Sites
>>>>> http://www.freeswitch.org
>>>>> http://confluence.freeswitch.org
>>>>> http://www.cluecon.com
>>>>>
>>>>> FreeSWITCH-users mailing list
>>>>> FreeSWITCH-users at lists.freeswitch.org
>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>> UNSUBSCRIBE:
>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>> http://www.freeswitch.org
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>>
>>>>
>>>>
>>>> Víctor E. Medina M.
>>>> Platform Architect / Chief Infrastructure
>>>> +58424 291 4561
>>>> BB #79A8AFA2
>>>> @VMCibersys
>>>>
>>>>
>>>>
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services:
>>>> consulting at freeswitch.org
>>>> http://www.freeswitchsolutions.com
>>>>
>>>> Official FreeSWITCH Sites
>>>> http://www.freeswitch.org
>>>> http://confluence.freeswitch.org
>>>> http://www.cluecon.com
>>>>
>>>> FreeSWITCH-users mailing list
>>>> FreeSWITCH-users at lists.freeswitch.org
>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>> UNSUBSCRIBE:
>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>> http://www.freeswitch.org
>>>>
>>>
>>>
>>>
>>> --
>>>
>>> *Brian West*
>>> brian at freeswitch.org
>>>
>>>
>>> *Twitter: @FreeSWITCH , @briankwest*
>>> http://www.freeswitchbook.com
>>> http://www.freeswitchcookbook.com
>>>
>>> ClueCon 2015 Call for Speakers
>>> <https://www.cluecon.com/call-for-speakers/> | Register
>>> <https://freeswitch.com/cart.php?gid=1> TODAY! | Reddit: /r/freeswitch
>>> <https://www.reddit.com/r/freeswitch>
>>>
>>> *T:*+19184209001 | *F:*+19184209002 | *M:*+1918424WEST (9378)
>>> *iNUM:*+883 5100 1420 9001 | *ISN:*410*543 | *Skype:*briankwest
>>>
>>> _________________________________________________________________________
>>> Professional FreeSWITCH Consulting Services:
>>> consulting at freeswitch.org
>>> http://www.freeswitchsolutions.com
>>>
>>> Official FreeSWITCH Sites
>>> http://www.freeswitch.org
>>> http://confluence.freeswitch.org
>>> http://www.cluecon.com
>>>
>>> FreeSWITCH-users mailing list
>>> FreeSWITCH-users at lists.freeswitch.org
>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>>> http://www.freeswitch.org
>>>
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
>> http://confluence.freeswitch.org
>> http://www.cluecon.com
>>
>> FreeSWITCH-users mailing list
>> FreeSWITCH-users at lists.freeswitch.org
>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>> http://www.freeswitch.org
>>
>
>
>
> --
> Sincerely,
>
> Giovanni Maruzzelli
> Cell : +39-347-2665618
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>
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