Ok. Thank you for your help.
On Sat, May 8, 2010 at 1:55 PM, Martin Vit <[email protected]> wrote: > On Sat, May 8, 2010 at 2:34 PM, mosbah abdelkader > <[email protected]> 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 <[email protected]> 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 > >> <[email protected]> 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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