[Asterisk-Users] G729 vs. gsm

[Steve Underwood]

chawki hammoud wrote:

>I installed G729 from Diguim and I was expecting the
>sound quality on my i686 machine to be better than
>gsm. Compared to gsm,  G729 sounds closer and a little
>robotic. Is this what is supposed to be or am I
>missing something? 
>I am interested in G729 because the internet in my
>country is very expensive and I want to save every bit
>possible. I want to use G729 because it takes less
>bandwidth for each additional call between two IAX
>servers than other codecs.
>  
>
Why did you expect it to sound better? Its a "high quality for 8kbps" 
codec. By absolute standards it sucks. GSM is less sophisticated, but 
running at 13.2kbps it can get away with that, and still sound as good. 
In fact, if there is lots of background noise GSM sounds rather better.

Regards,
Steve