[Asterisk-Users] G729 or GSM

[Kevin Walsh]

Jean-Yves Avenard [jean-yves.avenard at hydrix.com] wrote:
> I recently subscribed to a VoIP provider through IAX.
> The require to connect with either G729 or GSM, I chose G729 based on
> their recommendation. 
> 
> The service works very well, however ... people mentions how distorted
> our voice sounds. We have plenty of bandwidth available so I don't think
> it comes from our side. What it means is that it comes from two things:
> 1-G729 gives bad voice quality. So will GSM provides a better voice
> quality than G729? 2-VoIP provider has a screwy setup. I guess I will
> have to sort out 1 first. Maybe I can convince them to use iLbc instead.
> 
Try switching over to GSM and see if that makes a difference.  A
distorted voice could come from packet loss, so you might want to
add QoS (if possible) - at least as far as your border.

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