[asterisk-biz] Polycom IP 650 available now - quantities limited!

[Ron Arts]

Kevin P. Fleming schreef:
> Andrew Kohlsmith wrote:
>> The IP650 ulaw sounds better than the 601 ulaw?  Damn, I already consider the 
>> 501/601's audio high quality, the speakerphone in particular.
> 
> Yes, as surprising as that is. We have two of them (early models for
> testing) and when I replaced my 601 with the 650, connected to an
> Asterisk 1.2 server that most definitely does not have G.722 support, I
> still noticed a rather significant improvement in audio quality.
> 

We have recently done a speakerphone audio quality test, where we
(subjectively) compared audio quality of many of VoIP the phones that
are on the market today.

We lined up all models of Aastra, Grandstream, SNOM, Polycom, Cisco
(79xx and 790x), Thomson, Linksys and Sipura.

What we found was that the Polycom range stood with head and shoulders
above the rest, the best Cisco (7960) was comparable to the Polycom 501,
and the absolute best phone was the Polycom 601. Altough you might
naively expect the Polycom phones to sound the same, there is a
noticeable jump from the Polycom 301 to the 501, and then again to the
601.

Speakerphone quality really makes a difference. It's hard to believe
the Polycom 601 quality can be topped, but apparently it can...

Another conclusion was that established brands sounded better than
newer ones.

Ron

> Unfortunately, what that really means is that every phone you've ever
> owned before _could_ have sounded better, but didn't because
> manufacturer used cheaper parts :-) When you think about it, though, it
> does make some sense... if the frequency range of a G.711 call is just
> under 4KHz, then the manufacturer will choose mics and speakers that can
> just _barely_ handle that frequency. Since a G.722 call has a range of
> 8KHz, they have to use better parts, and if the cheaper parts couldn't
> really handle 4KHz as well as they should have, the 8KHz parts will, so
> suddenly sounds that were always there can now be heard.
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