asterisk users - Mar 2006 - carry forward uniqueid

Hi all,

I have a couple of asterisk servers running. When one asterisk server dials
another asterisk server
over IAX, i want to match that call in both of the cdr's.  How do i make
both asterisk servers use
the same uniqueid for that call, if this is possible.  Or is this a dumb
question since it is
'unique'.  I just want to match a call on different asterisk servers
from the cdr's.

thanks,
yusuf