[Asterisk-Users] G729 vs. gsm

[Michael D Schelin]

I have used G729 and it sounds almost as good as G711U. The problem is 
the way Asterisk uses it. It does not sound robotic and it's not suppose 
  to sound that way. Most Carriers want the calls to be in g711u so 
thats why I use G711u otherwise I want to save money on bandwidth. G729 
on Asterisk adds latency. this could be one of your problems. Also you 
will not get music on hold to play well with G729.


Andrew Kohlsmith wrote:

> On May 27, 2005 06:12 am, 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?
> 
> 
> It sounded more or less the same to me, perhaps with GSM being a little more 
> human (I can easily listen to music on hold with GSM).
> 
> 
>>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.
> 
> 
> Make sure you use IAX2 trunking then.  It can give you very large bandwidth 
> savings when you have multiple audio streams between two servers since the 
> UDP overhead is not repeated for every call.
> 
> -A.
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