ServiceInvoker returns msg from different service

[regget]

This what I'm trying to do possible?

I want to send a message via ServiceInvoker to a Service A.
Service A will send the message to Queue 1.
External application transports message from Queue1 to Queue2.
Service B has listener on Queue2 and processes the message, and then
passes the message Back to Service B.

[marklittle]

This is just a linear invocation, correct? Can you explain in more detail?