Avaya Index system with a Asterisk front end


I want to setup our asteriskbox within a office that presents its phone lines using a Avaya PBX.

The Avaya PBX receives two pri lines in and then spreads that out over various lines in to the office. We will receive 15 lines over 15 cables.

So my question is :

Would it be possible to get the 15 lines in to our asterisk box using the Digium analogue cards ?