I’m trying to do the same. I think that Inverse plugin is not necessary.
Look at these instructions:
You have to compile it and then you need to manually add the 4 plugins (.jar files) into your OpenFire server.
After that you can launch your pade. Here some helps to do it.
I could make it work, but just for messaging, I can’t share my desktop or send files.
If you get it working please share the way you could.
Cheers!