IT Baseline Protection Manual - The Information Warfare Site

Threats Catalogue Deliberate Acts Remarks
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T 5.12 Interception of telephone calls and data
transmissions
By abusing user facilities, it may be possible for colleagues to listen in on
telephone calls. One example is the add-on (three-party) conference. If
subscriber A receives a call for subscriber B, he might try, in secret, to
establish a three-party conference, instead of passing the call on. Subscriber B
would not be aware of this fact if he had a telephone set without a display.
In addition, it is possible for third parties to listen in on calls by activating
disabled user facilities which are partly not allowed in Germany. One example
is the add-on witness feature. Such an activation requires in-depth knowledge
of the system.
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IT-Baseline Protection Manual: Oktober 2000