asterisk users - Nov 2005 - calling to asterisk and listening to music (GSM)

Hi all!

I'm trying to play some music from asterisk, and when I call to the PBX
from a GSM mobile phone, the more I speak while hearing the music, the
worst is the quality of the music I hear... My audio is at 8Khz,
16bits/sample.

I've tried different codecs for asterisk, but results are the same...

If I call to the PBX from a conventional phone, I can speak while hearing
the music, with no quality loss...

Any idea? Does it have anything with the mobile-GSM standard used for coding?

What to do?

thanks,

-e

> Hi all!
>
> I'm trying to play some music from asterisk, and when I call to the PBX
> from a GSM mobile phone, the more I speak while hearing the music, the
> worst is the quality of the music I hear... My audio is at 8Khz,
> 16bits/sample.
>
> I've tried different codecs for asterisk, but results are the same...
>
> If I call to the PBX from a conventional phone, I can speak while hearing
> the music, with no quality loss...
>
> Any idea? Does it have anything with the mobile-GSM standard used for
> coding?
>
> What to do?
>
> thanks,
>
> -e
>