On 13-05-22 10:02 AM, Tommy Cooper wrote:
From the little experience I have I do not think that that is a good way of
testing the quality of voice. SIP only initiates and eventually terminates the
call, once that the call is connected, SIP and therefore Asterisk are no longer
involved. Once the call is connected it is assigned to a trapsport layer
protocol such as RTP. RTP is the actual protocol that delivers the voice call
between endpoints. I believe that the setup of your network, QoS, codecs
etc... determine the voice quality of your system.
----- Forwarded Message -----
From: Mitul Limbani <[email protected]>
To: Tommy Cooper <[email protected]>; Asterisk Users Mailing List -
Non-Commercial Discussion <[email protected]>
Sent: Wednesday, May 22, 2013 3:23 PM
Subject: Re: [asterisk-users] Stress testing Asterisk
I have a question here.
How can we test the quality of voice upon increasing the call load?
Can we try passing a voice file using sipp and record the same in dial plan
record application ? Is this reliable enough to simulate near real world
scenario?
Once upon a time, we set out to create exactly this for testing
asterisk. Our goal would have been to run the test every week,
comparing the results from the previous week, to make sure asterisk's
performance was not getting worse as new commits happened.
We came up with the idea of loading testing asterisk using SIPp or some
other dialer, then determining at what point asterisk would start
failing (performance). We decided the point of failure was quality of
audio, since it is usually the first thing to go (even though call
control still works).
It took a while, but with the help of Leif, we found a tool to analyse
audio streams (using MOS score[1]). Basically, you take the original
audio file, play it across the network, then record the other side.
Then, comparing the two files via Aqua, you get your MOS score.
If the score was less then x, you knew asterisk was hitting a
performance limit. Track that over time and concurrent calls, you have
your metrics.
[1] http://www.sevana.fi/aqua.php
--
Paul Belanger | PolyBeacon, Inc.
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Github: https://github.com/pabelanger | Twitter:
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