How configure a per port / stub http proxy in Apache CXF WS in JBoss EAP 5.1?

Issue

• Some of our webservices are internal to our network running on another JBoss instance, while others are external to our organization. So I have to be routed through a HTTP proxy with authentication for external calls while I should not for internal.
• I know how to globally set a HTTP proxy to be used in the JVM, but is there a way in JAX-WS to set a HTTP proxy only for a certain web service client, so that I can configure the proxy to be used only for external web service calls? For example: some thing like setting custom properties using BindingProvider.getRequestContext().put(...).