mattlandis Posted January 31, 2011 Report Share Posted January 31, 2011 I'm trying to understand the MOS scoring in the CDR. ;-) Question #1: I'm looking at this line: QualityEst:MOSLQ=4.1 MOSCQ=1.0 does "MOSLQ" = trunk calls on the graph? does "MOSCQ" = extension calls on the graph? We are trying to track down ext to ext calls that are MOS = 1.0. Question #2: If non snom devices are involved in a call, will this cause MOSCQ to be 1.0? We have a lot of Extension MOS=1.0 I'm trying to track down. thanks. Quote Link to comment Share on other sites More sharing options...
Vodia PBX Posted February 1, 2011 Report Share Posted February 1, 2011 You can look it up at http://www.rfc-editor.org/rfc/rfc6035.txt. Quote Link to comment Share on other sites More sharing options...
mattlandis Posted February 1, 2011 Author Report Share Posted February 1, 2011 question #2 missed. ;-) Quote Link to comment Share on other sites More sharing options...
Vodia PBX Posted February 1, 2011 Report Share Posted February 1, 2011 RIght if the other side does not respond to RTCP, then the MOS is pretty low (1.0 is the minimum value that you can get, not 0.0 as you might think without reading the RFCs...). Anyway, IMHO 1.0 practically means the information is not available and I would not be concerned about quality. If the score is 1.1, I would be concerned Quote Link to comment Share on other sites More sharing options...
mattlandis Posted February 1, 2011 Author Report Share Posted February 1, 2011 thanks for that feedback. we have a suspect port/pstnline on one gateway that is failing which is failing over to a sip trunk. I think this appears to be the source of all the 1.0 scores and we are checking it... Quote Link to comment Share on other sites More sharing options...
Vodia PBX Posted February 1, 2011 Report Share Posted February 1, 2011 Unfortunately, most SIP trunking provider never heared about RTCP-XR or even RTCP. Especially those who don't give too much about QoS... Quote Link to comment Share on other sites More sharing options...
mattlandis Posted February 1, 2011 Author Report Share Posted February 1, 2011 ahhh... so any call over a SIP trunk will return a 1.0? Also, what about Patton PSTN gateways? patton must, because on our own install we have NO 1.0 scores and we use a patton ourself. hmm Matt Quote Link to comment Share on other sites More sharing options...
Vodia PBX Posted February 1, 2011 Report Share Posted February 1, 2011 If the PSTN gateway supports RTCP, then the score will be already useful. For example, the round trip time can be calculated and the PBX will see how much packet loss it had on it's receiving side. If there is "one-way" RTCP-XR the PBX takes that number and assumes that the other direction performs the same way. This is better than nothing. Quote Link to comment Share on other sites More sharing options...
mattlandis Posted February 1, 2011 Author Report Share Posted February 1, 2011 thanks for that explanation. I see now why you gave the RFC. Quote Link to comment Share on other sites More sharing options...
Vodia support Posted February 2, 2011 Report Share Posted February 2, 2011 Here is another interesting article on MOS. http://voip.about.com/od/voipbasics/a/MOS.htm Quote Link to comment Share on other sites More sharing options...
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