Hi,
The thing that Guy is trying to point out (with some sense of humour) is that MOS by definition is a subjective measurement.
There have been various attempts to calculate MOS from objective measurements though (let me cite ITU-T G.107 E-Model as a reference), and Barry probably had these in mind. ;)
The problem is that many more parameters must be taken into account other than the network alone (and that is the only information Wireshark has at its disposal). The additional parameters include device-specifics like jitter-buffer implementation, echo handling and other audio related parameters, and that for *every* audio gateway along the path from sender to receiver.
Doing the calculation with "reasonable defaults" for those parameters would be possible but the result would not necessarily comply to what is experienced by the end users.
Regards,
Lars
-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Guy Harris
Sent: samedi 2 juillet 2011 01:52
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] VoIP MOS of pcap Files
On Jul 1, 2011, at 4:00 PM, Barry Constantine wrote:
> Does anyone know of a good tool (open source preferable or commercial) that can provide MOS scores off of pcap files?
I.e., something such as a tool that plays sounds from a pcap file for listeners, asks the listeners to rate the voice quality, and gathers up the scores from the listeners and produces an MOS from them?
I don't know of any, although the hard part would be the "plays sounds from a pcap file for listeners", and the code in Wireshark could possibly be used as a basis for that.
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