asterisk users - Sep 2005 - zapata nationalprefix-problem [Virus checked]

has anyone an idea how to display incoming national/international 
isdn-pstn-calls correctly to internal isdn AND sccp/sip-phones ?

without nationalprefix=0 and internationalprefix=00 I get incoming phone 
numbers correctly on isdn-phones
but the leading zero's are stripped of for non-isdn phones

when I set this prefixes inside zapata.conf my internal isdn-phones get 
this prefix twice...

is it possible to unset the prefixes for one or more cards serving 
internal line ?
I tried it without luck