[asterisk-users] voipmonitor.org

[Martin Vit]

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.
>> >
>
>