Faculty Publications
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Publications by NITK Faculty
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Item Effectiveness of SIP messages on SIP server(2013) Bansal, A.; Kulkarni, P.; Pais, A.R.Voice over Internet Protocol (Voice over IP, VoIP) is one of a family of communication protocols, and transmission technologies. It is used for delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks. Session Initiation Protocol (SIP) is a signaling protocol, widely used for controlling multimedia communication sessions such as voice and video calls over Internet Protocol (IP). There are several DoS attacks by which we can disturb SIP server. In this paper, more importance has been given to DoS attack by flooding of different SIP-messages. A little work is done to analyze the performance of SIP server and quality of ongoing VoIP calls under DoS attacks. We show the utilization of CPU and memory during the multiple simultaneous calls. We have done our study using a customized analysis tool that has the ability to synthesize and launch flooding of different SIP messages. We define the performance metrics to measure the quality of VoIP calls under DoS attack. We have developed some programs and integrated them in a real SIP test bed environment to measure the performance of SIP server and quality of VoIP calls under DoS attack. Our measurements show that a standard SIP server can be easily overloaded by simple call requests. It also shows that simple call request can degrade quality of ongoing calls. © 2013 IEEE.Item Mitigation of flooding based denial of service attack against session initiation protocol based VoIP system(Institute of Electrical and Electronics Engineers Inc., 2015) Bansal, A.; Pais, A.R.The Session Initiation Protocol (SIP) is the most popular signaling protocol used in Voice over Internet Protocol (VoIP). The flooding based DoS attack can be performed by sending only hundreds of SIP messages per second to a SIP server. In this paper, we have proposed a new mitigation scheme for SIP based VoIP system which can protect it from flooding based DoS attack. This scheme is based on the INVITE and BYE messages of the SIP protocol. A prototype system for the flooding based DoS attack on SIP server and a mitigation mechanism has been designed and implemented. The performance of the proposed system has been evaluated and found to be better than other existing mechanisms. © 2015 IEEE.