Re: [Linphone-users] MOS reporting

[Roman Imankulov]

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
address@hidden