DISA stop working

I’m having a problem with DISA module. I’m dialing-in to DISA, from an IVR. I can hear the dial tone, after I have entered password. When I hear the dial tone, I enter the DTMF digits, but Asterisk doesn’t recognize them. Asterisk behaves like I didn’t enter anything.
I’m using freePBX, DAHDi config and DISA My gateway card is AEX410s with 4FXO modules.
Can anyone hep me?