[Freeswitch-users] Audio quality issues

Wed Oct 23 23:48:04 MSD 2013

And a link with a great explanation of how to arrive at some of those
numbers:
http://voiceonbits.com/2010/08/15/codec-bandwidth-calculation-g711g729/

Guillermo


On Wed, Oct 23, 2013 at 4:28 PM, Guillermo Ruiz Camauer <grcamauer at gmail.com
> wrote:

> Here is some good data on per call real bandwidth consumption for
> different codecs:
>
> Codec BR NEB
> G.711 64 Kbps 87.2 Kbps
> G.729 8 Kbps 31.2 Kbps
> G.723.1 6.4 Kbps 21.9 Kbps
> G.723.1 5.3 Kbps 20.8 Kbps
> G.726 32 Kbps 55.2 Kbps
> G.726 24 Kbps 47.2 Kbps
> G.728 16 Kbps 31.5 Kbps
> iLBC 15 Kbps 27.7 Kbps
>
> BR = Bit rate
> NEB = Nominal Ethernet Bandwidth (one direction)
>
>
> On Wed, Oct 23, 2013 at 5:33 AM, Miha <miha at softnet.si> wrote:
>
>> Hi Steve,
>>
>> do you have any good preposal which switch has good performance for voip
>> trafic?
>>
>> miha
>>
>> Dne 10/22/2013 3:32 PM, piše Steve Underwood:
>> > Hi Grant,
>> >
>> > Two possibilities spring to mind:
>> >
>> > - If your audio is coming from a disk, can that disk keep up?
>> > - How good is your ethernet switch?
>> >
>> > Notice in the second point I said how good, not how expensive. Many
>> > switches choke on a large number of small media packets, including some
>> > expensive big name products.
>> >
>> > Regards,
>> > Steve
>> >
>> > On 10/22/2013 06:01 PM, Grant Bagdasarian wrote:
>> >> The network shouldn’t be an issue, since we have at least 1Gbps lines.
>> >> The tests stay within the network.
>> >>
>> >> I forgot to mention the calls are being distributed across two
>> >> machines by a Kamailio instance.
>> >>
>> >> So for a total of 800 concurrent calls generated by Sipp, each machine
>> >> has 400 active calls.
>> >>
>> >> CPU load reaches about 70% per machine.
>> >>
>> >> At this point both FS machines are virtualized, since the performance
>> >> gain wasn’t that much compared to physical.
>> >>
>> >> The VM host shows it is using ~3/4 of its CPU resources.
>> >>
>> >> Htop shows that the normal priority threads(green) and the kernel
>> >> threads(red) are about the same length.
>> >>
>> >> Also, FS is running on Ubuntu Server 12.04 x64.
>> >>
>> >> *From:*freeswitch-users-bounces at lists.freeswitch.org
>> >> [mailto:freeswitch-users-bounces at lists.freeswitch.org] *On Behalf Of
>> >> *Stanislav Sinyagin
>> >> *Sent:* Tuesday, October 22, 2013 11:11 AM
>> >> *To:* FreeSWITCH Users Help
>> >> *Subject:* Re: [Freeswitch-users] Audio quality issues
>> >>
>> >> 800 calls at 64kbps is 51Mbps.
>> >> Could there be a network issue, like a 100Mbps line between the
>> endpoints?
>> >>
>> >> How heavy is your CPU load? "htop" command would be helpful in this.
>> >>
>> >>
>> ------------------------------------------------------------------------
>> >>
>> >> *From:*Grant Bagdasarian <GB at cm.nl <mailto:GB at cm.nl>>
>> >> *To:* "FreeSWITCH Users Help (freeswitch-users at lists.freeswitch.org
>> >> <mailto:freeswitch-users at lists.freeswitch.org>)"
>> >> <freeswitch-users at lists.freeswitch.org
>> >> <mailto:freeswitch-users at lists.freeswitch.org>>
>> >> *Sent:* Tuesday, October 22, 2013 10:14 AM
>> >> *Subject:* [Freeswitch-users] Audio quality issues
>> >>
>> >> Hello,
>> >>
>> >> I was wondering what the maximum concurrent calls for FS before audio
>> >> quality becomes an issue? I assume the specs of the machine would also
>> >> affect this.
>> >>
>> >> We are currently running FS on a Six Core (12 Threads) Intel E5-2430
>> >> CPU and get about 800 concurrent calls at 10-20 CPS. The audio quality
>> >> at these rates is still fair, but we do notice some quality issue’s.
>> >>
>> >> Going above these numbers screws up the audio quality: choppy sound,
>> >> audio drops etc. We aren’t doing any heavy media processing, just
>> >> simply playing a file (G711-Alaw) which lasts about 2 minutes during
>> >> the load test.
>> >>
>> >> These numbers are for one way audio, where Sipp doesn’t echo the RTP
>> >> back. These numbers get lower once Sipp echo’s the RTP.
>> >>
>> >> I’ve tried FS on a physical box and also on a virtual box (ESXi 5.1),
>> >> but the performance gain on physical vs virtual isn’t that much.
>> >>
>> >> I disabled all the modules we don’t need, like CDR’s, conferencing,
>> etc.
>> >>
>> >> Are there any parameters(config files)/modules that can affect the
>> >> quality of the audio stream?
>> >>
>> >> Regards,
>> >>
>> >> Grant
>> >>
>> >>
>> >
>> >
>> _________________________________________________________________________
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>> > http://www.freeswitchsolutions.com
>> >
>> > 
>> > 
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>>
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
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>>
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>
>
>
> --
> Guillermo Ruiz Camauer
>


-- 
Guillermo Ruiz Camauer
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