Panasonic PBX with ISDN module + HFC PCI card

Hi All!

My company has a Panasonic PBX with 4 ISDN NT. We would like to insert our new voip server into the PBX and the 4 ISDN NTs. I connected all the NTs to a four port ISDN card and it accepts all incoming calls. But now we would like to forward these calls to a test card HFC PCI… I say again it is a test.

But when I connect the HFC PCI ISDN card to the Panasonic PBX there’s no connection between them, they do not see each other, no link at all. And It is not able to dial forweard to the PBX’s ISDN module

Could someone help me?
Was anybody else such a situation like this?