DAHDI and G.723


I am using TC 400B ( digium g.729 & g.723 ) transcoder card in our Asterisk installation. I have found that if I use the TC 400B driver “wctc4xxp” compiled as part of DAHDI installation, the audio quality of g.723 is very poor. The audio heard in the VoIP leg ( coming back from Asterisk ) is very wavy.

Is there any special instructions, I need to pass to compile the TC400B driver module while installing it as part of DAHDI ?