http://www.socnetcentral.com/vb/showthread.php?s=&threadid=32421
For an example... go there.. 
Sample:
Lead Detective on sting op; "1David to 1Edward how do you
copy?"
Reserve on sting detail; "1Edward to 1David you're 10-2(clear),
1Edward to 2Edward did you copy 1David?"
2nd Reserve on sting detail; "2Edward to 1Edward 10-2 for both,
2Edward to 1Robert did you copy 1David, 1Edward, and
2Edward?"
1Robert(me); "I copy that you copy that he copies that I'm
copied..(pause)..copy?"