Thanks for the reply.
... no, I don't see "received dtmf f", i get only:
[9] 20081021125333: DTMF: Power: 0 0 2 0 2 0 0 1 0
[9] 20081021125333: DTMF: Power: 1 2 0 0 0 2 0 0 1
[9] 20081021125333: DTMF: Power: 0 0 0 0 0 0 1 1 1
[9] 20081021125333: DTMF: Power: 0 2 0 0 0 2 0 0 1
.........
but nothing marked as "[6] received".......
I try also a call between 2 extensions (2 sip phone, snom and grandstream), once the call is established, I send a DTMF (only to try...), in the log i get the same messages, nothing like [6]...., only [9].....
Giorgio