asterisk users - Aug 2004 - Incorrect sound

Hi,
 
  i've build an asterisk with bri-stuff.0.1.0-RC3 with one hfc card
for use isdn phones. Everything seems to work fine, but if i pickup
the phone i hear only a cracky sound instead of a dialtone.
The sound seems to be too slow.

Something misterious happend if i open the asterisk console and
type "help". As long as the list scolls down the sound gets normal,
but
if it finished the sound is cracky again.

I've already checked for a irq conflict and the  Asterisk Version
is "CVS-HEAD-08/12/04-09:00:00-BRI-stuffed".

Any Ideas?

greetz,
 Johannes