I've heard a MOS of 4.4 is ulaw/alaw, presumably like a local exchange
call through the pstn.
testyourvoip.com tells me that the highest score available with G.729 is
4.2, which is pretty darn close to 4.4.
I don't know why I think this (or why I've heard it (or if it's right))
but I think gsm is 3.8? Maybe someone can confirm or disconfirm this.
This kinda seems like the codec my long distance calls go out on but I'm
not really sure.
http://www.testyourvoip.com/results.html?id=071GM0&result=0
(one of my more POOR results) approximates about 2.75 for 'tin cans and
string', 3.2 for a crummy cell phone call, about 3.9 for a decent cell
call, 4.4 or so for 'like calling next door', and the mystical 5.0 for
'better than being there'.
I wonder if 16kHz wideband codecs would bring our voice-carrying
experiences into the 5.0 range?
Moj
Olivier wrote:
Hi,
How would you best learn VoIP Quality of Experience ?
Before diving into packet loss and jitter, I would like to know what a
toll-quality call is, what a rated 3.5 MOS call is like.
I'm wondering how I should proceed.
Shall I :
- get pre-recorded sound files somewhere and simply stream them to a MOS
enabled softphone (Counterpath sells eye-beam which includes a telchemy
MOS rating module),
- or shall I install some network impairment software, generate VoIP
trafic and tweak myself jitter and other parameters so that I can
associate network measures to call quality ?
I've never heard of any sound files library aimed to learn what the
impact of packet is like for end user experience.
I've seen here and there network simulators (some of them free of
charge) but it seems tricky to tune them to VoIP (is a 10% packet loss
realistic or not ?).
To make myself perfectly clear, my ultimate goal is to better undestand
users testimonies when they warn me about poor quality phone calls.
Regards
!DSPAM:500,450f2da465292693510148!
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Mojo <[EMAIL PROTECTED]>
Office Manager, Horan & Company, LLC
(907) 747-6666 x112
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