Connection between CRM back end and ASP front end website for Ecommerce

Hi All,

I want to establish the connection between a ASP website and CRM back end server(we are replacing th existing ERP back end system with SAP CRM ).

I want to know whether I have to go with XI or any other connectors provided by SAP to establsih the communication between the existing ASP website and CRM back end server..

Can anyone please help me out.

Thank you,