RFC call from non-sap system to PI

Hi Folks,

We have a requirement where we have a non-sap system that is only capable of RFC calls and we want to route these message through PI to ERP system. We are on SAP PI 7.31 Single stack. Any suggestion on how we can achieve this in PI? What config needs to be done in PI to receive these RFC calls from a non-abap system.

Thanks,

BG.