Price aside... we have no issues so far with Amazon. Carlos. 2015-04-05 19:22 GMT-04:30 Carlos Ruiz Díaz <carlos.ruizdiaz@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@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-virt...
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: >>>>> consulting@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@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@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@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@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@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@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@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@freeswitch.org http://www.freeswitchsolutions.com
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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 http://www.cluecon.com
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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 http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@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@freeswitch.org http://www.freeswitchsolutions.com
Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com
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