IT Baseline Protection Manual - The Information Warfare Site

Safeguard Catalogue - Hardware & Software Remarks
____________________________________________________________________ .........................................
S 4.36 Blocking fax recipient numbers
Initiation responsibility: Superiors, IT Security Management
Implementation responsibility: Fax Officer, fax mail centre
Currently, there are at least three methods of preventing the accidental or
intentional transmission of information or documents via fax to undesired
recipient numbers:
Some devices allow the (positive) exclusion of certain recipient numbers or
(negative) exclusion of all recipient numbers except certain selected ones from
fax communication.
The same type of authorisation can be realised in modern PBX systems,
provided that the fax machine is connected to the telephone network via such
a system.
If a fax machine or PBX does not offer such a possibility, one alternative is to
rent an auxiliary device from the operator of the public network which
prevents the establishment of a connection with certain subscriber numbers
(positive and negative exclusion).
Additional controls:
- Is there a requirement for blocking certain fax recipients?
- Have fax messages been sent to a wrong recipient on any occasion?
____________________________________________________________________ .........................................
IT-Baseline Protection Manual: Oktober 2000
Settings at the fax
machine or fax server
Settings at the PBX
Using auxiliary devices