"alessio.soldano(a)jboss.com" wrote : I'm thinking you might be able to get the endpoint metadata from the message context. Then you could set the env namespace in the MessageFactory depending on the bindingId in the endpoint metadata. Could this be the solution here? Thanks Alessio, this approach is working fine with my JAX-RPC test - just need to add a JAX-WS test to confirm all is working there and will then be committing. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4165923#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...