Java APIs

Dear Everyone,

I apologize if this has been answered already. I have searched the forums extensively and found no solution, however, the problem might be described differently than I am thinking.

Here is the situation:

I have an application utilizing RMI Callback. I have successfully implemented a custom RMIServerSocket to force my server to listen on a fixed port, and I have successfully implemented a custom RMIClientSocket to ensure that my client will communicate with the server on this fixed port. This works flawlessly. I would like to know if it is possible to force my server application to perform RMI Callback to the client utilizing a fixed port as well. Essentially, I would like all server communications to originate from a single, fixed port back to the client. The destination port does not matter, I am concerned with the source port on the server application.

In a diagram:

Current:
Client (port <random1> ---> Server (port 52520)
Client (port <random1> <--- Server (port <random2>)

Desired:
Client (port <random1> ---> Server (port 52520)
Client (port <random1> <--- Server (port 52521)

I admit freely that I am a new java developer, and have extremely limited experience with RMI. I would greatly appreciate any clear, concise, and pointed advice on this matter. If the question has been answered elsewhere, please point me to it.