Avaya Toll Fraud and Security handbook
 

Is a really, really great resource for understanding both the risks and how to best secure your communications system.

It can be accessed here:
ftp://ftp.avaya.com/incoming/Up1cku9.../025600_10.pdf

If you have Nortel equipment, you may want to access the following link:
http://www2.nortel.com/go/solution_a...0&locale=en-us

...that is, unless someone has a better equivalent on the Nortel side.

thanks for the handbook jharling....