Intrusion-Detection at the PSAP


Brief description

In the past years Voice over IP (VoIP) telephony started to migrate from the research to the market. It is expected that in the future All-IP networks will substitute the classical Public Switched Telephony Networks (PSTNs). Nowadays, there is no All-IP network yet, but first steps have been made. There are different VoIP-providers which do not only provide telephony service between two VoIP peers, but also enable calls from VoIP to PSTNs and vice versa by providing gateway services between PSTN and VoIP networks. Thus, the PSAP is accessible by the VoIP network (e.g. the Internet). As a result of this connection there are further challenges concerning the security of the PSAP. There is especially the danger of denial of service (DoS) attacks. Thus, there is a need for an appropriate Intrusion Detection and Response.


  • Christoph Fuchs, Nils Aschenbruck, Felix Leder, Peter Martini
    "Detecting VoIP based DoS attacks at the Public Safety Answering Point"
    Proc. of the ACM Symposium on Information, Computer and Communications Security,
    ASIACCS 2008, Tokyo, Japan, March 18-20, 2008, pp.148-155.

  • Nils Aschenbruck, Matthias Frank, Peter Martini, Jens Tölle, Roland Legat, Heinz-Dieter Richmann
    "Present and Future Challenges Concerning DoS-attacks against PSAPs in VoIP Networks"
    Proceedings of the Fourth IEEE International Workshop on Information Assurance,
    IWIA 2006, Royal Holloway, United Kingdom, April 13-14, 2006, pp. 103-108, [pdf, slides].

Diplomarbeiten / Master Theses

  • Christoph Fuchs,
    Design und Implementierung einer Intrusion-Detection-Erweiterung für ein PBX-System zum Einsatz in Leitstellen