Integration of EBP with SUS

Hi Experts,

Need you advise on the below

We are planning to implement SAP SRM 7.03 / SAP SLC 2.0. We are going for Integrated deployment scenario for SLC (ie) to deploy SAP SLC buy side on SRM server as an add on component and SAP SLC sell side on SUS.

Is it possible to use RFC for the integration between EBP & SUS or XI/PI is mandatory?

Awaiting for your valuable inputs

Thanks