[PLUG] VoIP on DSL?

[Galen Seitz]

AthlonRob <AthlonRob at axpr.net> wrote:

> On Sun, 2004-04-11 at 12:20, Kyle Hayes wrote:
> 
> > Different codecs have different bandwidth requirements.  G.723.1 is 
> > one of the lowest with around 7-8kbps.  G.729 is better quality but a 
> > little higher bandwidth.  About 12kpbs IIRC.  This is just for the 
> > codec audio stream, not other overhead!
> 
> What's a kpbs?
> 
> I'm sure it isn't Kilobits per second, as 12k really isn't very much
> bandwidth, in the grand scheme of things.  Guess I could host a lot of
> those on my 512/256 slow-ass DSL.
> 

It is kilobits per second.  A typical voice channel would be 8 bit u-law
or a-law samples at 8 kHz.  That gives 64 kbps.  With 8 to 1 compression
that puts it in the realm of Kyle's numbers.  If you could tolerate LPC
compression, you could get 2.4 kbps.

galen