In this chapter, we present a solution for evaluating the Quality of Services (QoS) of Voice over Internet Protocol (VoIP). First, we present an introduction to the main concepts and mathematical background relating to QoS and Internet Protocol (IP) traffic nature, which subsequently are used in the measurements, analysis, and modeling of VoIP traffic. Secondly, we analyze network measurements ...

VoIP is a rapidly growing area with great market potential. To promote it for both commercial and research purposes, we are developing an efficient voice access system based on state-of-art Motorola communication techniques. It is composed of a communication subsystems, a voice interface, and an information agent. Implementation of the high performance communication system is described in this ...

Voice-over-IP (VoIP) has rapidly gained popularity in the last years, especially on smartphones platforms. In fact, WLAN chip-sets are becoming more common on smartphones, allowing users to use VoIP services from their mobile devices. On the other hand, the excessive energy consumption of the WLAN chip-set, limits the widespread use of VoIP on mobile phones. As most of the energy is spent when ...

Voice over IP (VoIP) introduces new ways of communication, while utilizing existing data networks to provide inexpensive voice communications worldwide as a promising alternative to the traditional PSTN telephony. SPam over Internet Telephony (SPIT) is one potential source of future annoyance in VoIP. A common way to launch a SPIT attack is the use of an automated procedure (bot), which generat...

This paper addresses the schedulability of VoIP packets in a low-bandwidth shared medium broadband access network. We show that EDF (Earliest Deadline First) without preemption is an optimal scheduling algorithm for the case where the size of the packets and the tolerated jitter are equal for all the packets, in the sense that no other algorithm, with or without preemption, may schedule more pa...

The present paper describes the approach and preliminary results from the research project EUX2010SEC. The project works closely with Voice over IP (VoIP) companies and users. The project aims at providing better security of open source VoIP installations. The work towards this goal is organized by gathering researchers and practitioners around scientific activities that range from security mod...

In this paper, we present a survey on management mechanisms used for ensuring the Quality-of-Services for Voice-over-IP applications. We first address the motivations of QoS management for VoIP. We then partition the system into two management planes: data plane and control plane, and describe mechanisms in each plane respectively. In data plane, we cover several important techniques including ...

Reconfigurable systems provide improved performance by adapting to computations which are not feasible with current processor architecture.As Voice over IP networks (VoIP) are delay sensistive, maintaining quality of service in these networks is essential. Since VoIP is offering real time services, degradation of QoS due to the channel can be rectified only at the receiver end . In this paper, ...

Communication services such as, Voice over IP (VoIP), over the Internet have gained much attention in recent years, as next generation Internet applications are requiring the integration of voice and data in the single IP infrastructure. In this paper, we propose a Peer-to-Peer (P2P)/ Grid-based architecture to efficiently provide VoIP services in large scale IP networks. Particularly, our tech...