DTMF recognition on ARM

Hi all,
I have an Asterisk on a ARM processor. When my DTMF are inband he don’t recognize them.
I have make a copy of the conf file, on a asterisk on I386 processor, and the DTMF works perfectly.
Can you tell me why the DTMF don’t work on the ARM processor.

Edit : If I use the fonction sendDTMF() i don’t ear any sound.

So I think that the detection and generation of the DTMF don’t work