[Asterisk-Users] Incoming ISDN DATA calls answered by asterisk IVR! - How to stop that?

[Pisac]

When incoming DATA calls arrive on ISDN, Asterisk recognise that this is
DATA call, but behaving like it is voice call: Answering call, playing
IVR messages, etc...

How to stop that? I want that only VOICE calls are answered by Asterisk,
and DATA/FAX to be ignored.

(I'm using Asterisk 1.2.1 Brisftuffed 0.3.0-PRE-1f with ZapHFC ISDN BRI
lines)