How to communicate between external application's soap client and soapui tool

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SOAP

WSDL

SoapUI

client-server

I have a scenario, where in an external application's client will be sending a soap message to SoapUI tool and the SoapUI tool should send a automated response message(multiple responses) back to the external application. Can this auto response be achieved by using SoapUI tool, if so how it can be achieved? Also need directions on below points if the above mentioned scenario is legitimate using SoapUI

1) How to communicate between the external application and SoapUI tool?(which URL needs to be configured in external application's client module for it to send message to SoapUI)
2) Where to configure the external application's server URL in SoapUI tool for it to send auto response to external application?
3) Is it possible for SoapUI tool to send multiple automated responses to external application's server?

If someone could help me in clarifying the above points would be of great help.

What I have tried:

I have tried to get this achieved through mock services, but unable to find and configure the SoapUI tool's server module to receive a message/request from the external application's client.