[Freeswitch-users] Audio quality issues

Tue Oct 22 21:28:16 MSD 2013

Hi,

I would be also interested in this as i am experiancing
same issue, poor audio quality and media dropping.

Br,

Miha

On Tue, 22 Oct 2013 16:03:29 +0200
 Grant Bagdasarian <GB at cm.nl> wrote:
> Yes, it does!
> 
> I also found this:
>
https://wiki.freeswitch.org/wiki/Misc._Dialplan_Tools_echo
> 
> Echo application for FS.
> Going to see if that works first. If not, I'll setup a
> Sipp in server mode.
> 
> From: freeswitch-users-bounces at lists.freeswitch.org
> [mailto:freeswitch-users-bounces at lists.freeswitch.org] On
> Behalf Of Ali Pey
> Sent: Tuesday, October 22, 2013 3:50 PM
> To: FreeSWITCH Users Help
> Subject: Re: [Freeswitch-users] Audio quality issues
> 
> You can make calls from sipp that also terminates on sipp
> and then play a wave file in sipp.
> 
> Change your dial plan in FS to route the calls to an
> instant of sipp that can terminate the calls.
> 
> Does this make sense?
> 
> On Tue, Oct 22, 2013 at 9:22 AM, Grant Bagdasarian
> <GB at cm.nl<mailto:GB at cm.nl>> wrote:
> A while back I used iotop to measure the disk access, and
> FS was hardly using any io during tests.
> 
> How do I simulate two way audio?
> I know I can make Sipp send an RTP stream using a pcap
> file, but how do I make FS sent RTP back which is not
> read from disk? Does FS have an echo application?
> Or is it enough for Sipp to send the media?
> 
> From:
>
freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org>
>
[mailto:freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org>]
> On Behalf Of Ali Pey
> Sent: Tuesday, October 22, 2013 2:25 PM
> 
> To: FreeSWITCH Users Help
> Subject: Re: [Freeswitch-users] Audio quality issues
> 
> I think the problem here is that you are playing a file
> for every call for the duration of the call. The
> bottleneck seems to be the disk access. If there were to
> be two way audio path, FS would only proxy the media
> which would be quite faster as there would be no file
> reading and playing involved. Attempt a test case with
> fewer or no file play and only media proxy and test
> again.
> 
> 
> On Tue, Oct 22, 2013 at 6:01 AM, Grant Bagdasarian
> <GB at cm.nl<mailto:GB at cm.nl>> 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>
>
[mailto: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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