speex not working with vicidial

Hi I am trying to get speex working coz in speex i can do be ot changes (in codecs.conf)
My voip service provider says speex sounds better than gsm.
But in this forum gsm and g729 is said to be good.
I got 1mg link sym.. Can this be enough for 20 agents if used gsm?
thanks
cheers
My voip service provider says speex sounds better than gsm.
But in this forum gsm and g729 is said to be good.
I got 1mg link sym.. Can this be enough for 20 agents if used gsm?
thanks
cheers