asterisk users - Apr 2010 - Avaya UUI

Hello List,

I need to connect with an Avaya PBX (this part is done), and i would  
like to get and send back User-to-User Information (UUI) with the  
call. The UUI need because I need to identify the call based on  
something witch is available on Asterisk and Avaya too.

It is possible, or have a better solution?
Anybody did it before?

Thanks for the help!

Zsotya