To capture the IP address of the machine from where request(Inbound Webservice) has hit Siebel.

Hi,
I am using the out of box BS "Web Engine HTTP TXN" to get the Ip address of the machine on which user has opened the Sibel Web Client.
This works fine and provides the IP address.

However, there are cases when request to Siebel will come from external system by invoking the Siebel Webservices.
The external system will invoke the Siebel Webservice and create SR, Orders in Siebel.
The requirement is to capture the IP address of the system(it will be mainly the middleware) from where the request hit the Siebel system.

I am not sure if this question makes any sense but is it possible to get the Ip address of the machine from where the request has hit Siebel(Inbound Webservice) by using the above out of box BS?