Connecting dual stack PI with ECC

HI all

I have to connect a dual stack PI with ECC system.

Is establishing connection between PI and ECC similar to single stack PI? In single stack PI I don't have to configure anything in PI, only in ECC

1) RFC Destination type G, PI_AEX, should I use the Path Prefix as /XISOAPAdapter/MessageServlet?ximessage=true

2) SAP_PROXY_ESR, do I have to configure this RFC Destination if am not using proxy