asterisk users - Oct 2006 - Asterisk+Panasonic KX-TDA100+zaphfc NT link problem

Hi,

I have asterisk with zaphfc, two ISDN cards, one TE mode another NT mode.
When connecting cards together with isdn crosscable link is ok.
When connecting TE card to the Panasonic KX-TDA100 link is also ok.
When connecting NT mode card to the panasonic, panasonic doesn't see the 
link, asterisk shows link is up, when checking link_state it shows G3 
which means active.

Any ideas?

Mc.