[Asterisk-Users] G729 vs. gsm

[Michael D Schelin]

Clue or clueless? Your call.

Steve Underwood wrote:

> Michael D Schelin wrote:
> 
>> Steve, you should really test the Codec and have G729 running as a 
>> pure IP to IP call you can not hear the difference on good networks! 
> 
> 
> Well, it does to anyone without hearing damage. It sounds very obviously 
> different.
> 
>> Please do not get me wrong that G711u sounds better through the PSTN.  
>> Thats a given! You can't convert G729 up and down to G711 and expect 
>> the sound quality to be there. I'm a carrier and have tested G711 and 
>> G729 and have found that they both sound great through dedicated 
>> hardware.
> 
> 
> This is meaningless drivel.
> 
>> Asterisk's colors the G729 a little. Also my
> 
> 
> The only time when Asterisk colours G.729 is when there is packet loss. 
> Asterisk isn't handling that well.
> 
>> hearing is fine. Please do not put down the comments of others in this 
>> forum. I'm stating my comments from my real world trials and this is 
>> not bad information.
> 
> 
> Since it doesn't correlate with the impression of even the developers of 
> G.729, it *is* bad information. Realistic people know G.729 will be 
> worse. What they need is meaningful guidance as to just how much.
> 
>> The man must compare codecs on his own and see what works for him. For 
>> me we've stuck with G711u because it's best through the PSTN. If I was 
>> running a pure IP to IP system I would use G729, Iblc, or GSM.
> 
> 
> In a sane world pure IP to IP systems would't use G.711, G,729, iLBC, or 
> GSM. They would be usign a wideband codec, as Skype does. Look at the 
> favourable impression people have of that.
> 
> Next time, its probably better to argue with someone who hasn't spent 
> time in speech codec development. We tend to have a clue what we are 
> talking about. :-)
> 
> Regards,
> Steve
> 
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