Wireshark · Wireshark-dev: Re: [Wireshark-dev] Voice (RTP stream) quality - mos, delay, bandwidth, ...

[Guy Harris <guy@xxxxxxxxxxxx>]

daniel zhang wrote:

> 1. MOS
> Voice quality was traditionally reported as a Mean Opinion Score (MOS) 
> on a scale from 1-5 where 1 is the lowest and 5 the highest.
> I am not an expert on this but I think probably we could add the MOS 
> into Ethereal.

At least according to the Wikipedia article on the Mean Opinion Score:

	http://en.wikipedia.org/wiki/Mean_Opinion_Score

the score comes from people listening to particular phrases and giving 
their 1-to-5 rating of the quality of the sound, not from a calculation 
you could perform on a raw digital signal.  That means Wireshark (the 
new name for the program that used to be called "Ethereal") couldn't 
calculate the MOS for a given voice sample (at least not without a 
plugin that connects to a number of user's machines, plays the sample to 
the user, asks them for their rating, and then averages the results; I 
don't know whether that could be done in a way that conforms to ITU-T 
Recommendation P.800).