Re: [GnomeMeeting-list] fresh new CVS snaps =)

[michel memeteau <mmemeteau marseille-wireless org>]

OK here s what they say .... dont mention whether it s free ( as in beer )  or
not  

GIPS iSAC 
GIPS iSAC - a wideband, adaptive codec, designed to deliver high quality sound
in both high-bit-rate and low-bit-rate conditions. GIPS iSAC makes VoIP
communications possible even using a dial-up modem, automatically adjusting
transmission rates to deliver better-than-PSTN voice quality.

Quoting michel memeteau <mmemeteau marseille-wireless org>:

> Thanks for those precisions , I understand why a SIP registrar would use G711
> ,
> I did not now that we could use Fax over G711 but I understand it because it
> s
> a lassless codec ( not sure about that ) ..  I gave a try to Sjphone , but it
> s
> a bit limited I guess .... Can you phone a PSTN with it ?? 
> 
> Another question : is this ISAC codec free as ILBC , did skype change the
> default codec ....  I thought they were using only ILBC at first .....
> 
> Quoting Stefan Bruens <lurch gmx li>:
> > 
> > There are good reasons to use G.711:
> > Low complexity - modern, high efficient codecs use a lot of computing
> power,
> > 
> > so if you want to do a lots of channels, you have to trade bandwith for low
> 
> > complexity. Especially Speex needs a lot of cpu power ...
> > High quality - if you are providing a PSTN gateway, you want to have the
> best
> > 
> > possible narrowband codec - and G.711 is your choice then. Even the best 
> > modern codecs will give a (unnoticeable) worse quality.
> > Fax transparency - G.711 is the only codec you can transfer Fax over 
> > transparently.
> > Low latency - if you dont care about bandwith, G.711 gives you the lowest 
> > latency
> > 
> > Greetings,
> > 
> > Stefan
> > 
> > -- 
> > Stefan Brüns  /  Kastanienweg 6 - Zimmer 1206  /  52074 Aachen
> > mailto:lurch gmx li  http://www.kawo1.rwth-aachen.de/~lurchi/
> >    phone: +49 241 169-4206     mobile: +49 160 3797725
> > 
> 
> 
> -- 
> Michel memeteau
> 0624808051
> jabber : freechelmi
> www.marseille-wireless.org
> 
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-- 
Michel memeteau
0624808051
jabber : freechelmi
www.marseille-wireless.org

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