"timfox" wrote : What I was expecting is if I make an invocation from the server to the client as is currently the case for delivering messages to clients, then the http transport is clever enough to realise it is only allowed to make invocations from client to server, so uses some kind of polling mechanism to get messages from server to client. Here's the call on the server side that calls the callback server on the client side. It's in ServerConsumerEndpoint.Deliver.run(): anonymous wrote : | MessagingMarshallable resp = (MessagingMarshallable)connection.getCallbackClient().invoke(mm); | | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3973403#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...