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KnowingAbout.com 07-27-2006 06:14 PM

VoIP call quality falls - Survey
 

VoIP call quality has taken a nosedive over the last 18 months, with
nearly 20 percent of VoIP callers experiencing unacceptable voice
quality, according to a survey done by Brix Networks.
The results come from Brix Networks' TestYourVoIP.com site, a free
VoIP quality-testing portal. Brix claims that nearly one million VoIP
phone tests have been conducted at the site since its March, 2004
launch.

Brix claims that from late 2004 through mid-2006, the tests done at the
site have shown a consistent decrease in overall voice quality as
calculated via the Mean Opinion Score (MOS). MOS is an a measurement of
conversational voice quality that rates calls on a scale from one (bad)
to five (excellent). Test calls with a MOS of 3.6 or better are usually
regarded as being satisfactory, and those below it as unsatisfactory.
Only 81 percent of VoIP calls tested on the site were rated at 3.6 or
better, the company says.

How accurate are the results? Without a third party to analyze them,
it's difficult to know. Brix, though, sells IP and VoIP testing
solutions, and the company does have a vested interest in touting any
results that show poor VoIP quality. On the other hand, anyone who has
made a VoIP call knows only too well the sometimes erratic nature of
call quality.
- By Networking Pipeline Staff

For Further Information : www.knowingabout.com/voip


Lena 07-28-2006 07:36 PM

Re: VoIP call quality falls - Survey
 

KnowingAbout.com wrote:
> VoIP call quality has taken a nosedive over the last 18 months, with
> nearly 20 percent of VoIP callers experiencing unacceptable voice
> quality, according to a survey done by Brix Networks.


And in order to let them test your VOIP, they get in to your computer
to make the call? No thanks.

"TestYourVoIP.com will make a call from wherever you are to one of our
U.S. or international test locations and report the results for free.
It'll only take about 20 seconds if you have Java installed."

I test my VOIP every time I make or receive a call, and mine is 100%
perfect.
I continually read Broadband Reports on VOIP and have not read about
any such nonsense.
I am suspicious about the motives in re-publishing or plagerizing that
report.

Lena


FTR 07-28-2006 09:15 PM

Re: VoIP call quality falls - Survey
 
Lena wrote:
>
> I test my VOIP every time I make or receive a call, and mine is 100%
> perfect.
>


How do you do that, Lena ?

Tor-Einar Jarnbjo 07-28-2006 10:19 PM

Re: VoIP call quality falls - Survey
 
KnowingAbout.com wrote:

> How accurate are the results? Without a third party to analyze them,
> it's difficult to know.


Blame the poor and cheap ISPs. From my location in Germany, I'm getting
a MOS of 4,2 to Sydney, 4,3 to San Jose and 4,4 to all other
destinations. I'm finding it odd though, that the delay to Sydney
(>300ms routed via New York, Sacramento, CA and back to Ashburn, VA)
does not have a greater impact on the calculated MOS.

Tor

FTR 07-29-2006 09:01 AM

Re: VoIP call quality falls - Survey
 
Tor-Einar Jarnbjo wrote:
> KnowingAbout.com wrote:
>
>> How accurate are the results? Without a third party to analyze them,
>> it's difficult to know.

>
> Blame the poor and cheap ISPs. From my location in Germany, I'm
> getting a MOS of 4,2 to Sydney, 4,3 to San Jose and 4,4 to all other
> destinations. I'm finding it odd though, that the delay to Sydney
> (>300ms routed via New York, Sacramento, CA and back to Ashburn, VA)
> does not have a greater impact on the calculated MOS.
>
> Tor

What is a MOS, how do you measure it? For a non-engineer it is difficult
to understand this
- Frank

Tor-Einar Jarnbjo 07-31-2006 09:03 AM

Re: VoIP call quality falls - Survey
 
FTR wrote:

> What is a MOS, how do you measure it? For a non-engineer it is difficult
> to understand this


Mean Opinion Score. It's a measurement for line quality, commonly based
on personal evaluation, but TestYourVoIP is using an automated process
(probably taking packet loss, delay and jitter in consideration) for
calculating it. 4.4 is the best MOS technically possible for a regular
phone call:

http://testyourvoip.com/faq.html#mos

Tor

Lena 07-31-2006 10:22 AM

Re: VoIP call quality falls - Survey
 

FTR wrote:
> Lena wrote:
> > I test my VOIP every time I make or receive a call, and mine is 100%
> > perfect.

>
> How do you do that, Lena ?


"Mean Opinion Score. It's a measurement for line quality, commonly
based
on personal evaluation,.."
I'm mean and opinionated, and I personally evaluate every call as it
sounds in my ears. That's what's important to me.

Lena


FTR 07-31-2006 11:07 AM

Re: VoIP call quality falls - Survey
 
Lena wrote:
> FTR wrote:
>
>> Lena wrote:
>>
>>> I test my VOIP every time I make or receive a call, and mine is 100%
>>> perfect.
>>>

>> How do you do that, Lena ?
>>

>
> "Mean Opinion Score. It's a measurement for line quality, commonly
> based
> on personal evaluation,.."
> I'm mean and opinionated, and I personally evaluate every call as it
> sounds in my ears. That's what's important to me.
>
> Lena
>
>

Thanks! The MOS is the 'I hear you five' from the old radio telephone
days in the military. I didn't know the term.

Now that we know that 4.4 is the highest level that you get with VoIP
what is the level of a goog analogue landline?

I must admit that with Skype PC-PC calls here in Europe you get an
excellent voice quality, sometimes even better than traditional
landline. When you use SkypeOut for PC-landline the sound quality drops
so considerably that I can't use SkypeOut for business calls: the worst
is that the beginning of words are often cut. Also the transmitted voice
frequency is limited. You can even hear the loss of quality. So, this is
why I ask: when comparing VoIP services which one provide an acceptabmle
quality when the call terminates on a landline?

However, as someone who works with stats everyday: using a mean for
skewed data as the MOS does is a procedure that is just - bad. Any
student that proposes this is a stats course would get 0/5 points.

- ft


--
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kyron 08-01-2006 06:00 PM

re:VoIP call quality falls - Survey
 
sipgate is currently doing very poor andyet my scores are high andwith
sipgate it is painfull
---
External Post from http://ukvoiptalk.com


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