chan_mobile at asterisk 1.4 + asterisk side poor audio


I try to use chan_mobile with an Edimax EB-DGC1 adapter that is at supported list at voip-info. I can make and receive calls but at asterisk side audio is very poor. Other partner listen to me very well but I hear him like a robot and with 2-3 seconds latency.

Anyone who can help me?