Send data from Appian to SAP PI

Hi,

I am trying to send some info from Appian to SAP PI. I am using the "Call Web Service " smart service to do this but I have a problem.The wsdl is accepted, the operation if found and input&ouput activity class parameters are there, but when executing the process model after a while the node will crack and the error message is "The maximum time to establish a connection with the remote server was reached". I also verified the service in soapUI and the endpoint is correct.
Has anyone integrated with SAP PI using this smart service?

Thanks