[asterisk-users] Calculating R Factor and MOS metrics for VoIP

[Mindaugas Kezys]

There is no problem to get necessary data for "MOS" calculation for Call Leg
A using:

${CHANNEL(rtpqos,audio,all)}

How to get similar data for Call Leg B?

It would be very nice to have such info even if it will not lead to correct
MOS calculation.

Regards,
Mindaugas Kezys

Kolmisoft UAB 
VoIP Billing Solutions
e-mail: info at kolmisoft.com
URL: http://www.kolmisoft.com


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Kevin P.
Fleming
Sent: Monday, March 08, 2010 6:31 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Calculating R Factor and MOS metrics for VoIP

Steve Underwood wrote:

>> MOS and R factor are the two QoS parameters used to estimate VoIP call 
>> quality.
> You can't calculate MOS. Its an assessment based on a lot of human 
> hearing. Nonetheless, there is a profitable industry in pretending to 
> calculate MOS.

Right, computers don't have 'opinions' (the 'O' in 'MOS'). However, it
seems that many people use PESQ scores as a MOS-equivalent for test and
planning purposes now. However, that requires running predefined samples
through the system under test, not just calculations based on network
effects of real calls.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
skype: kpfleming | jabber: kfleming at digium.com
Check us out at www.digium.com & www.asterisk.org

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