Here is one more - MTPSec: Customizable Secure MTP3 Tunnels in the SS7 Network by Hemant Sengar, Duminda Wijesekera and Sushil Jajodia http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1420252 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com