Nortel and Asterisk Integration over E1 with CAS

Hi all experts,

We really need all of your inputs and helps for integrating the Nortel legacy pbx and Asterisk over E1 on CAS protocol.

Please any one work before on this or any idea or suggestion how we will integrate Asterisk through E1 with CAS protocol.

Please I appreciate some one help me on this integration.

Thanks in advance.