Elvis brings up a good point about QoS which should help me with scoring calls -- are per-call values available for jitter, packet loss, and delay available from within asterisk?
On 11/1/05, Elvis Lee <[EMAIL PROTECTED]> wrote: > Hi Simon, > > I thought audio quality on IP Network is more based on these three > attributes: > > reduced jitter, reduced packet loss, and lower end-to-end delay - If I'm not > mistaken there is a range for each of the three attributes (ranges) beyond > which the quality is poor (echo, etc..). > > and MOS was more of an opinion around the different voice compression > algorithms G.711, G.726, G.729 > > > Regards, > > Elvis > > > > > > > "Simon P. Ditner" <[EMAIL PROTECTED]> wrote: > From what I've read, MOS (Mean Opinion Scoring) is a formalized > process for calculating the results of listening tests performed by > unbiased and preferably untrained (in MOS) people. They rate the > audibility of recorded sentences from bad (1) to excellent (5), and > then I imagine they pick out the mean value. > > On 31/10/05, Leif Madsen wrote: > > On 10/31/05, Simon P. Ditner wrote: > > > I'm load testing an asterisk application, and I'd like to determine > > > the audio quality automatically. I'm already doing DTMF tests, but I'm > > > looking for something a little fuzzier I think. > > > > > > My initial knee-jerk reaction is to record the audio, and then apply > > > some sort of algorithm to it that will provide me with a few metrics > > > to compare with the original recording. Some very preliminary research > > > has turned up two standards, "Perceptual Analysis/Measurement System" > > > (PAMS), and "Perceptual Speech Quality Measure" (PSQM) -- does anyone > > > have any insights into what is behind these standards, or whether > > > they're worth researching? > > > > From what I've seen, for VoIP, most of the time it is "Mean Opinion > > Score" (MOS). A good site for testing this is TestYourVoIP.com. I also > > found a simple page on MOS at > http://www.techabulary.com/m/mos.html. > > > > However I'm not familar how MOS scoring actually works (in terms of > > the algorithm it uses and such). I'd be very interested to have some > > sort of automated test of VoIP quality though. > > > > -- > > Leif Madsen. > > http://www.leifmadsen.com > > http://www.oreilly.com/catalog/asterisk > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > -- | First they ignore you, then they laugh at you, then they fight you, | then you win. -- Mohandas Gandhi | | The Toronto Asterisk Users Group | Join the discussion group by visiting http://taug.ca | or by sending email to [EMAIL PROTECTED]
