[Freeswitch-users] Audio quality issues

[Donny Hardyanto]

 Actually G711 will consumes abaout 167kbps for a call (64 kbps for each
side, and the other is IP header, RTP header, Ethernet header) so 800 calls
of this will be 133.8 Mbps. If your line is 100 Mbps then you have
saturated the line.

Donny

---------- Forwarded message ----------
From: "Stanislav Sinyagin" <ssinyagin at yahoo.com>
Date: Oct 22, 2013 4:12 PM
Subject: Re: [Freeswitch-users] Audio quality issues
To: "FreeSWITCH Users Help" <freeswitch-users at lists.freeswitch.org>
Cc:

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>
*To:* "FreeSWITCH Users Help (freeswitch-users at lists.freeswitch.org)" <
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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