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Spit (Spam over Internet Telephony), known as unsolicited bulk calls sent via VoIP networks, is a major problem that undermines the usability of VoIP. Countermeasures against spit face challenges in identifying and filtering spit in real time. A user behavior based on three parameters (interaction,historical, and social ratio) is used to design an anti-spit technique. The rationale for the technique...
VoIP applications have gained popularity due to largely reduced cost and wider range of advanced services, as compared to traditional telephone networks. However, SPIT (spam over Internet telephony), known as unsolicited bulk calls sent via VoIP networks, is becoming a major problem that would undermine the usability of VoIP. Unlike detection and filtering of e-mail spam, countermeasures against SPIT...
QoS guarantee is very important and challenging for voice over IP (VoIP) applications. In this paper, a new packet scheduling scheme, called UTS, for transmitting voice flows in a fair and prioritized manner is proposed. UTS first translates user-requested voice quality into network delay requirements and then schedules the transmission of voice packets in such a way that all the VoIP users have a...
Traditional network-level quality of service (QoS) techniques are efficient from a network perspective, but they have not provided a QoS that is satisfactory to users. This paper proposes a dynamic class-based scheme to enhance user-perceived voice quality. Its main strength lies in its careful consideration of users' perception of quality and mapping it to specific values of multiple network parameters...
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