>From: Jim McBride <jim @
>Again, per my previous post, I would like somebody to explain to me
>how you think you can forge a clid even with switch access, if you can
>prove me wrong, great...but I dont think you can.
The signaling network ISDN uses is a network of computers. Computers
can be hacked, especially by insiders. The security of the system is
only as good as its weakest link. Hacking telephone network computers
is an interesting topic. If a malicious telephone employee has inside
access to the computer system and has the knowledge (it is available),
that person could possibly fake out the CLID. I personally don't
think it is probable, but if enough money is at stake, it will be
done. An employee could configure the switch to not validate the CLID
on an inside port (e.g., test port), then generate calls with a fake
CLID to the destination. If a local telco employee knew that a
certain number of lines were connected to a call center, that employee
could probably monitor those lines and pull off whatever traffic was
going over the lines (depending on the internal security of the CO).
Hascall H. ("Chip") Sharp Teleos Communications, Inc.
Sr. Systems Engineer 2 Meridian Road
Eatontown, NJ 07724 USA
voice: +1 908 544 6424
fax: +1 908 544 9890
email: hhs @