asterisk users - Nov 2006 - BRIcard not sending DTMF

Hi,
I'm getting crazy about a DTMF problem. I have an Asterisk 1.2.9.1 box 
with 2.6.18 kernel using a beronet BRI card who refuses to send DTMF.
I noticed there are a lot of parameters for tuning DTMF detection but 
not for sending..is there a good guy out there who knows what parameter 
to enable to send DTMF?

TIA

Giorgio Incantalupo