[Asterisk-Users] why incoming DATA CALLS are answered as VOICE by asterisk IVR?

[Pisac]

When incoming DATA call arrive on ISDN BRI, asterisk (zaphfc) recognise
that this is DATA call, but answering anyway (playing IVR messages,
etc...)

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

(I'm using Asterisk 1.2.1 Brisftuffed 0.3.0-PRE-1f,  ZapHFC)

Log:

-- Accepting data call from 'XXXXXXXX' to '3001' on channel 0/2, span 1
-- Executing Answer("Zap/2-1", "") in new stack
-- Executing BackGround("Zap/2-1", "ivr_intro") in new stack