IT Baseline Protection Manual - The Information Warfare Site

Safeguard Catalogue - Hardware & Software Remarks
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S 4.59 Deactivation of ISDN board functions which
are not required
Initiation responsibility: Head of IT Section, IT Security Management
Implementation responsibility: Administrators
A modern ISDN board and its communications software, as well as the
operating system in the card's RAM, possess numerous features in addition to
pure ISDN functionality. Such "convenience functions", some of which can
also be used when the IT system is inactive, include:
- The reception and transmission of faxes
- Functions of a digital answering machine
- Playback of messages recorded on the answering machine
- Telephony via a microphone and earpiece included in the scope of supply
of the board
Wherever possible, card functions which are not required should be
deactivated, preferably by removing the related software modules. Card
functions which can be configured simply through parametrisation must be
checked regularly to determine whether the parameter settings are still correct.
Additional controls:
- Are checks made to determine whether available functions are actually
required?
- Have functions whose use is obviously not required been disabled?
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IT-Baseline Protection Manual: Oktober 2000