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Publications in Scientific Journals:

M Happenhofer, J. Fabini, C. Egger, M. Hirschbichler:
"An Architectural and Evaluative Review of Implicit and Explicit SIP Overload Handling";
International Journal of Measurement Technologies and Instrumentation Engineering (IJMTIE) (invited), International Journal of Measurement Technologies and Instrumentation Engineering (IJMTIE) (2011), Volume 1, Issue 4; 12 - 27.



English abstract:
Last years´ trend to migrate circuit-switched voice networks to packet switched Internet Protocol (IP) based networks has favored the wide deployment of Session Initiation Protocol (SIP) based systems and networks. Recently, as a reaction to large-scale SIP deployment experiences in the field and the need to implement high availability and reliability within these new networks, the focus of SIP extension standardization has shifted from adding new SIP signaling functionality to operational and maintenance aspects, a particular importance being attributed to overload control.
Overload denotes a situation in which the traffic injected into a system exceeds the system´s designed capacity. In this paper we present a detailed categorization of overload architectures and outline main reasons why SIP-based networks are at high risk to collapse when operating at overload. Using measurements in a real SIP infrastructure we compare the performance of two overload protection schemes, namely implicit and explicit overload protection, against the performance of non-protected systems. The results of our measurements recommend overload protection as a mandatory requirement for commercial SIP deployments to safeguard operation and prevent system collapse in case of overload.

German abstract:
Last years´ trend to migrate circuit-switched voice networks to packet switched Internet Protocol (IP) based networks has favored the wide deployment of Session Initiation Protocol (SIP) based systems and networks. Recently, as a reaction to large-scale SIP deployment experiences in the field and the need to implement high availability and reliability within these new networks, the focus of SIP extension standardization has shifted from adding new SIP signaling functionality to operational and maintenance aspects, a particular importance being attributed to overload control.
Overload denotes a situation in which the traffic injected into a system exceeds the system´s designed capacity. In this paper we present a detailed categorization of overload architectures and outline main reasons why SIP-based networks are at high risk to collapse when operating at overload. Using measurements in a real SIP infrastructure we compare the performance of two overload protection schemes, namely implicit and explicit overload protection, against the performance of non-protected systems. The results of our measurements recommend overload protection as a mandatory requirement for commercial SIP deployments to safeguard operation and prevent system collapse in case of overload.

Keywords:
Communication System, Overload Protection, Session Initiation Protocol


"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.4018/ijmtie.2011100102


Created from the Publication Database of the Vienna University of Technology.