[asterisk-users] voipmonitor.org

[mosbah abdelkader]

Ok.

Thank you for your help.

On Sat, May 8, 2010 at 1:55 PM, Martin Vit <vit at lam.cz> wrote:

> On Sat, May 8, 2010 at 2:34 PM, mosbah abdelkader
> <mosbah.abdelkader at gmail.com> wrote:
> > Thank you Martin,
> >
> > So the MOS-LQE does not inform bout payload itself but predicts the MOS
> > based on networks metrics
>
> yes exactly. LQE is Listen Quality Emodel (E-model is parametric model
> which takes into account some more parameters. I've used static
> parameters except for loss and burstiness. So if your network is
> stable and you want to measure MOS, there is no way how to do that on
> unknown samples. You can do only automated tests.
>
>
> > and P862 and P863 uses also payload (voice) to
> > calculate the MOS. Is it true what I have understood.
> >
>
>
> yes, P.862 (PESQ) compare two samples. Original and degraded (and
> about 20 seconds). P.563 does not need original sample and can predict
> only degraded sample (only about 20 seconds). It cannot analyze  whole
> conversation. Both methods is suited for automated tests with specific
> samples. These objective methods compare new codecs, transmittion path
> etc. etc.. It will never work as real live passive monitoring. I've
> used P.862 to calibrate MOS-LQE.
>
> MV
>
>
> > Best regards.
> >
> > On Sat, May 8, 2010 at 1:17 PM, Martin Vit <vit at lam.cz> wrote:
> >>
> >> Hello,
> >>
> >> I've choosen only MOS-LQE because it is calculated only on network
> >> parameters, which is loss, burstinnes and delay (which is converted to
> >> loss by jitterbuffer simulator). It does not takes into account voice
> >> (payload). There is no effective objective methods (today) which
> >> predicts MOS. Only ITU-T P.862 and P.563 which is patented and it can
> >> analyze only 20 seconds samples. I've tried implementing P.563 and it
> >> is not usable for real live use, only for automated tests which is not
> >> in my interest now (and because of patents). I've calibrated MOS-LQE
> >> with polynomial functions using P.862 PESQ. I will write more on
> >> voipmonitor.org documentation once I've found more time.
> >>
> >> I'm using voipmonitor on central gateway and succesfully monitoring
> >> all SIP traffic and filtering calls by the worst MOS. So yes, you can
> >> use that tool for measuring quality of IP network in realtime. If you
> >> save PCAP files, you can analyze it with wireshark in more depth.
> >>
> >>
> >>
> >>
> >>
> >> On Sat, May 8, 2010 at 1:42 PM, mosbah abdelkader
> >> <mosbah.abdelkader at gmail.com> wrote:
> >> > Hello,
> >> >
> >> >
> >> > First, thank you for your great job.
> >> >
> >> >
> >> > I want to know why you have choosed to calculate only MOS-LQE. Why you
> >> > have
> >> > only used G107. Is that model suitable for VoIP operators to have a
> >> > calculated QoS value so they can confirm their quality.
> >> >
> >> >
> >> > Thanks again and best regards.
> >> >
> >
> >
>
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