Connecting Asterisk to Samsung Officeserve 100

Hi,
How can I connect my Asterisk server to Samsung Officeserv 100? We have the Telco line coming to the Samsung PBX that has digital phones connected to it. We would now like to have the call come into the Asterisk PBX from the Samsung EPABX.

Can this be done? What type of telephony card is required for this?

Thanks,
Raj Mohan