SOAP to RFC scenario

Hi Experts,

I have got a SOAP to RFC synchronous scenario. I am aware of how to do that. But there is an additional requirement that if XI is unable to connect to SAP for eg if R/3 system is down then XI should send the message to Webserver that R/3 system is down. If XI is able to connect to R/3 system then send the relevent details i.e output of RFC to Webserver. How to acheive this?

Thanks

Suma