DTMF problem with FXO card

Hi,

I’ve got a problem with DTMF detection when i called onto my asterisk box with the FXO card. It couldn’t detect any option on my Digital Receptionist menu. It’s on a DSL line. The system worked fine on T1 and cable modem. Anyone encountered the same problem and had solution? I’ve searched everywhere including this forum but no help yet.

Thanks a lot.