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A SPIT Avoidance Workflow for SIP-Provider

Authors:
Nicolas Rueger
Sebastian Huebner
Bettina Schnor

Keywords: Session Initiation Protocol (SIP); Voice over IP (VoIP); Spam over Internet Telephony (SPIT); Security

Abstract:
Voice-over-IP (VoIP) replaces traditional telephony network infrastructures in growing numbers. Along with this infrastructure change, Spam over Internet Telephony (SPIT) is likely to spread massively, similiar to spam in e-mail infrastructures. Thus, it is necessary to develope appropriate countermeasures. Since the request for a call, usually indicated by the ringing of the phone, might already be a disturbance or annoyance of the called party, traditional content-based preventive and defensive measures, used to avoid e-mail spam, are not applicable anymore. This paper presents a new SPIT Avoidance Workflow for the detection and prevention of unsolicited calls and its implementation. The majority of the presented preventive security measures are applied on side of the provider using the Session Initiation Protocol (SIP). The workflow therefore is implemented for the widely used Kamailio SIP Server that has become a de facto standard in the field of SIP telephony because of its high-performance and robustness. Further, this paper gives an evaluation of the overhead introduced by the different workflow modules. The measurements of the prototype confirm that it is possible to filter and rate call attempts in a larger scale.

Pages: 94 to 101

Copyright: Copyright (c) IARIA, 2012

Publication date: February 29, 2012

Published in: conference

ISSN: 2308-4413

ISBN: 978-1-61208-183-0

Location: Saint Gilles, Reunion

Dates: from February 29, 2012 to March 5, 2012