Without having any details only one thing I can say for sure: you will have to add BTW/BTR messages.
To get more details yo will have to give us more infrmation first - see post above
I fully agree with my distinguished colleagues in that we need more information in order to give you detailed answers ... here is a link to a recent thread that might help you understand the type of information that we need ...
the situation seems to be very much like the one that you're working on right now ... I hope that this helps ... if not, tell us more about your system and we'll see what we can do ...