Can you attach your jboss-esb.xml?
I have attached a samle of my esb xml files. Basically the MessageProcessingServiceOutbound service will invoke a webservice exposed by httpgateway and soap proxy in the MessageProcessingInboundWS service.
The same application can be deployed in two seperate machines and the MessageProcessingServiceOutbound uses the apprrpriate host name(IP) to invoke the webservice. The webservice itself is not doing anything special , just passing back the message received.
Thanks and Regards