Doesn't detect answering machine-continuous ringing

Hi! i had the same problem with the guy who posted this but there were no solutions yet. just trying my luck should anyone have already encountered this and have resolve the issue. pleas help.

i have an outbound dialer set up. whenever we encounter answering machine calls it just rings. continuous ringing on this call. but if im out of the dialer side directly to my gateway answering machine calls picks up, i hear the voice prompt just fine. i thought at first that this was a carrier problem because it seems like FAS. the call status on the dialer is already answered but its still ringing.

please help. thanks.