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Chapter 2. VoIP Threat Taxonomy > Threats Against Availability

Threats Against Availability

Threats against availability are actually a group of threats against service availability that is supposed to be running 24/7 (24 hours, 7 days a week). That is, these threats aim at VoIP service interruption, typically in the form of Denial of Service (DoS).

The typical threats against availability are as follows:

  • Call flooding

  • Malformed messages (protocol fuzzing)

  • Spoofed messages (call teardown, toll fraud)

  • Call hijacking (registration or media session hijacking)

  • Server impersonating

  • Quality of Service (QoS) abuse

The following subsections describe the threats with examples, which show you how they impact service availability.

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