Hi,
Does Linphone have a feature of calculating MOS (Measn Openion Score) of a
voice call? If yes, how the score is reported, RTCP, SNMP or ...?
As I know there is no satisfactory way to calculate MOS on the fly.
* Originally proposed method (see ITU-T Rec. P.800) requires
absolutely unsuitable conditions (such as specially-equipped studios, etc)
* There is also PESQ (ITU-T Rec. P.862) which requires both reference
and degraded speech samples (as I suppose, this is also unsuitable for
the real-time quality estimation).
* Last chance is an E-model (ITU-T Rec. G.107) which originally was
proposed as quality estimation model for the circuit switching networks.
Some of parameters of this model (such as one-way delay) cannot be
calculated without additional measurements.
I'd like to hear if somebody knows another ways to calculate speech
quality or knows how to implement in real-time VoIP application some of
methods proposed below.
Also I'm not sure but it seems that PESQ and E-model are patented.
--
WBR, Roman Imankulov
[EMAIL PROTECTED]
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