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This paper focuses on fault tolerance of super-nodes in P2P-SIP systems. The large-scale environments such as P2P-SIP networks are characterized by high volatility (i.e. a high frequency of failures of super-nodes). Most fault-tolerant proposed solutions are only for physical defects. They do not take into account the timing faults that are very important for multimedia applications such as telephony...
In recent years the Department of Defense has aggressively invested in development of an Internet Protocol (IP) based network that interconnects mobile air platforms and ultimately will also connect to the Global Information Grid (GIG) as part of its Net-Centric Warfare initiatives. One of the major visions for the IP based networks is to support interoperable voice communication amongst heterogeneous...
Development of Internet brings the great increasing communication requirement. This demand impels the developing progress of Voice over Internet Protocol (VoIP). It is difficult to supply the high quality user experience for VoIP services, which has brought great challenges to VoIP developer because of the dynamic property of Internet. We obtain the following results in lots of existing VoIP systems:...
As VoIP applications become increasingly popular, voice quality remains the user's biggest concern. Peer-to-Peer network can potentially obtain qualified relay nodes (QRNs) to make path switching when the QoS of a default path degrades. Locating quality relay nodes rapidly and inexpensively however is a very challenging task. In this paper, we design and develop a sophisticated system to take snapshots...
Peer-to-peer mechanisms are considered as one of the key innovative and user-friendly solutions for real-time Internet communication services. Eliminating server-based architecture, reducing or eliminating configuration effort, and allowing end-user devices to bring resources into the network, will reshape the network as we currently know it. This presents substantial opportunities for networks and...
With the popularity of VoIP, Push-To-Talk (PTT) services over the IP networks have gained their momentum. This research aims at essential design issues for the quality of service of PTT services. We explore the relationship between the speech quality and system design issues. MOS (Mean Opinion Score), which is raised by the ITU-T (International Telecommunication Union) as one of the most common benchmarks,...
This paper represents a performance comparison between Skype, a popular P2P-based VoIP Internet application, and tradition VoIP clients, such as Windows Live Messenger and Yahoo Messenger, which use client-server model. In order to draw a conclusion the main parameters that determine usability of the software were analyzed. These parameters are connection setup delay, end-to-end delay, jitter.
Some proposals are found on the literature for decentralizing SIP-based Voice over IP (VoIP) systems, replacing the client-server architecture for a P2P overlay network but none of the proposed solutions deploying a P2P network had studied the impacting of decentralization on call setup delay. We proposed a system using Kademlia instead of a centralized user location approach. Kademlia offers concurrent...
Peer-to-peer (P2P) has recently been employed to deliver large scale video multicast services on the Internet. Considerable efforts have been made by both academia and industry on P2P streaming design. While academia mostly focus on exploring design space to approach the theoretical performance bounds, our recent measurement study on several commercial P2P streaming systems indicates that they are...
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