[asterisk-users] local channels and g729a voice quality

[Patrick Lists]

On 18-01-12 04:57, Roi Stork wrote:
> Hi,
>
> I wasn't aware of the difference in quality between landline and
> mobile phones, or that cellphones use a low bit rate.
> I did a test again, landline voice quality is better.
>
>  From what you observed, how much drop in quality do I expect when
> switching from ulaw to g729 for a normal mobile-to-mobile call?

Afaik mobile to mobile uses the gsm codec (in gsm country, no idea about 
cdma etc.). IMHO gsm is not bad but certainly not as good as ulaw/alaw. 
Read up on MOS:
https://en.wikipedia.org/wiki/Mean_opinion_score

Regards,
Patrick