Call Quality Measuring

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Hi everyone.

We regularly get customers complaining about call quality issues. Most of the time it turns out to be their own broadband. Very occasionally server load. Does anyone have any advice or links to advice on measuring call quality?

I’ve been playing around with “sip show channelstats” but can’t other than measuring the packet loss I don’t really know what I’m supposed to be looking for in order to say “ah ha! that’s the problem!”. I also don’t know what it’s limits are. Will the stats in “sip show channelstats” show a customer using a torrent client and saturating their own broadband connection?

Regards, Patrick.

6 thoughts on - Call Quality Measuring

  • Hi Patrick,

    try voipmon, there it’s free and you can even track MOS.


    Am 25.03.2015 um 14:21 schrieb Patrick Beaumont:

  • Hi Markus,

    Sounds interesting to me too… However my google-fu is letting me down today – I found VOIPmonitor at Sourceforge but this looks like you’ll need a license.

    Any chance you have a link to voipmon?

    Cheers ..

    Brendan Ord OntheNet – Network Engineer P 07 5553 9222
    F 07 5593 3557
    Level One, 165 Varsity Parade Varsity Lakes Qld 4227 (Map)



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  • Some SIP hardphones (Polycom) or softphones (Counterpath) embed a module that metter MOS.


    2015-03-25 14:21 GMT+01:00 Patrick Beaumont


  • Thanks for the suggestions guys. I’ll try to have a play with Voipmonitor in the near future.

    So can I assume from the lack of discussion nobody is using the “sip show channelstats” stuff?

    Regards, Patrick.

  • Hi Patrick,

    You are welcome to try our tools out for active and passive voice quality measurement tools. It’s waveform analysis (like PESQ or POLQA) and VoIP
    metrics analysis (like G.107 E-model and other metrics).

    You can read more at or older site