RMI - Connecting to a remote server on a dial up line?

Hi everyone,
I badly need help in my rmi application which i have partly developed. I have an application to transfer daily data which is generated in the factory which is 200 miles from the head office where the server is located... I am able to transfer the data locally on my lan network...i.e. inside my head office premises.
However as I said I need to transport my client application to my factory which is 200 miles away from my H.O. How do I run my client there and connect to my server in the H.O. How do I do that? Do I need to use some software ? How do I connect to my factory server ? My Client application will be executed in factory server...?So how will the factory server connect to the H.O. server? I suppose you need modems at both ends and connected through telephone..?? I am not sure about that... Can you help me with this ?? I will be highly obliged....