[asterisk-users] Extract a MOS value from Asterisk CDR

Thu Apr 2 06:31:04 CDT 2009

Formula here: http://www.nessoft.com/kb/50 has jitter in it.

Regards,
Mindaugas Kezys
http://www.kolmisoft.com
VoIP Billing and Routing Solutions

-----Original Message-----
From: Marc Leurent [mailto:lftsy at leurent.eu] 
Sent: 2009 m. balandžio 2 d. 13:56
To: asterisk-users at lists.digium.com
Cc: Mindaugas Kezys
Subject: Re: [asterisk-users] Extract a MOS value from Asterisk CDR

Hello all, I have put my MOS.ods file into
http://dev.leurent.eu/voip/MOS/

My problem is to add the jitter value into the formula....
Have you got any idea how to do it?

-- --
Marc LEURENT

Le Thursday 02 April 2009 11.20:06 Mindaugas Kezys, vous avez écrit :
> Could you share with us your Openoffice callc function?
> 
> Regards,
> Mindaugas Kezys
> http://www.kolmisoft.com
> VoIP Billing and Routing Solutions
> 
> 
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Marc Leurent
> Sent: 2009 m. balandžio 2 d. 11:29
> To: asterisk-users at lists.digium.com
> Subject: Re: [asterisk-users] Extract a MOS value from Asterisk CDR
> 
> Indeed, we already have
> - the function to convert R factor to MOS
> - the R function R = R0 -Is-Id-Ie+A
> - the codec used
> - the rtt, rx/tx jitter, packet loss
> 
> What ye do not have but is needed:
> - A factor, a note between 0 and 20 -> 0 for landlines
> - the Burst Ratio, I'm using 1 (random repartition)
> 
> I already have an openoffice calc function to calculate the MOS regarding the 
> rtt, packet loss, codec, I have to add the jitter!
> 
> Here are the URL I have used
> * http://www.itu.int/rec/T-REC-G.107-200503-S/en
> * http://www.ixiacom.com/library/white_papers/display?skey=voip_quality
> * http://www.itu.int/ITU-T/studygroups/com12/emodelv1/tut.htm
> 
> Have a nice day!
> 
> -- --
> Marc LEURENT
> Ingénieur VoIP
> 
> DECKPOINT SA
> Une société du groupe VTX Telecom
> ================================================================
> Rue Eugène-Marziano 15 - 1227 Les Acacias
> http://www.vtx.ch - marc.leurent at vtx-telecom.ch
> ----------------------------------------------------------------
> VTX, votre partenaire telecom proche de vous !
> ================================================================
> 
> Le Thursday 02 April 2009 03.27:48 John Todd, vous avez écrit :
> > Thank you for the interesting links on MOS values and calculations!
> > It seems that many (most?) of the values that are used to construct R
> > and MOS could be obtained from the data that exists within the
> > dialplan, at least as far as the visible RTP path is concerned.   Or
> > is there data missing in the current RTCP statistics that would be
> > required to make correct R/MOS value estimates?  (If so, then that's
> > on-topic for asterisk-dev, otherwise this should be moved to asterisk-
> > users...)
> >
> > Here is the data that I think is already visible:
> >
> >   - codec choices
> >   - round-trip delay to RTP endpoint
> >   - packet loss
> >   - jitter
> >
> > I think it is too complex to determine "Irecency", "A" or packet loss
> > bursts unless there is significant additional code added to Asterisk
> > to capture more granular time-slices of data on each call.  I also
> > think that mid-call codec changes should not be considered due to
> > complexity.  Currently, I think this is un-necessary since most people
> > don't even seem to compute MOS to start with.
> >
> > So in your examination you may come up with a script or dialplan that
> > creates a synthetic R or MOS value - could you post it to a blog, or
> > if it is very short, to the asterisk-users mailing list?  I think this
> > would be worthwhile.
> >
> > JT
> >
> > On Apr 1, 2009, at 2:57 PM, Mindaugas Kezys wrote:
> > > Sorry for replying for the second time, but this issue is
> > > interesting for me
> > > also.
> > >
> > > I found such link: http://www.nessoft.com/kb/50
> > >
> > > And this:
> > > http://www.jdsu.com/product-literature/voipstats_an_acc_tm_ae.pdf
> > >
> > >
> > > Regards,
> > > Mindaugas Kezys
> > > http://www.kolmisoft.com
> > > VoIP Billing and Routing Solutions
> > >
> > >
> > > -----Original Message-----
> > > From: asterisk-users-bounces at lists.digium.com
> > > [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Marc
> > > Leurent
> > > Sent: 2009 m. balandžio 1 d. 18:15
> > > To: Asterisk Users Mailing List - Non-Commercial Discussion
> > > Subject: [asterisk-users] Extract a MOS value from Asterisk CDR
> > >
> > > Hello all,
> > > I'm tring to retrieve a formula to calculate a MOS value from
> > > Asterisk RTCP
> > > stats...
> > > Have you got any idea how to do it?
> > > Thanks
> > >
> > > I'm reading all G.107 ITU docs to retrieve something...
> > >
> > > I'm saving the SIP RTCP stats with:
> > >
> > > [macro-hangupcall]
> > > exten => s,1,Set(CDR(userfield)=${CHANNEL(rtpqos|audio|all)})
> > > exten => s,n,ResetCDR(vw)
> > > exten => s,n,NoCDR()
> > >
> > > So I retrieve these values in my MySQL CDR table in order to
> > > calculate a MOS
> > >
> > > value:
> > > "ssrc
> > > =
> > > 592614191;themssrc=0;lp=1;rxjitter=0.000000;rxcount=0;txjitter=0.00000
> > > 0;txcount=20734;rlp=0;rtt=0.094000"
> > > codec used: g711a
> > >
> > >
> > > --
> > > -- --
> > > Marc LEURENT
> > > lftsy at leurent.eu
> > >
> > > _______________________________________________
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> > ---
> > John Todd                       email:jtodd at digium.com
> > Digium, Inc. | Asterisk Open Source Community Director
> > 445 Jan Davis Drive NW -  Huntsville AL 35806  -   USA
> > direct: +1-256-428-6083         http://www.digium.com/
> >
> >
> >
> >
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-- 
-- --
Marc LEURENT
lftsy at leurent.eu