Prevent modems rather than detect them (Was: tool for detect modems in a lan)

[Alessandro <a.bottonelli () infinito it>]

Inspired by the previous thread, I am asking myself (but my experience of 
telephony is way too outdated to answer my own question...): do "modern" 
(whatever that means) private exchanges have a feature to distinguish between 
true voice calls/fax AND data calls? If so, one could just configure them to 
block data calls whether inward or outward.

Another way to prevention would be to provide non-standard telephone lines to 
the desktops. I once worked for a company where the extensions where provided 
with digiltal lines that where proprietary. No ISDN TAs and no analog modems 
would work.

The other side of the coin is of course... money. Non standard telephone 
terminals are probably going to be more expensive than standard ones, but you 
may end up spending less money than chasing modems throughout a large 
organization and with more peace of mind that your company security policies 
are enforced (at least on this particular modem issue).

-- 
Alessandro Bottonelli
CISSP & BS 7799 Lead Auditor
www.axis-net.it






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