An enhanced SIP proxy server for wireless VoIP in wireless mesh networks

Int. Inst. of Telecommun., Montreal
IEEE Communications Magazine (Impact Factor: 4.01). 02/2008; 46(1):108 - 113. DOI: 10.1109/MCOM.2008.4427238
Source: IEEE Xplore


The wireless mesh network (WMN) has emerged recently as a promising technology for next-generation wireless networking. In WMNs, it is important to provide high quality multimedia service in a flexible and intelligent manner. To address this issue in this article, we study the Session Initiation Protocol (SIP) for wireless voice over IP (VoIP) applications. Especially, we investigate the technical challenges in WMN VoIP systems and propose a design of an enhanced SIP proxy server to overcome them. An analysis of the signaling process and a study of simulation results have shown the advantages of our proposed approach.

Full-text preview

Available from:
  • [Show abstract] [Hide abstract]
    ABSTRACT: This authoritative guide is the first to provide a complete system design perspective based on existing international standards and state-of-the-art networking and infrastructure technologies, from theoretical analyses to practical design considerations. The four most critical components involved in a multimedia networking system - data compression, quality of service (QoS), communication protocols, and effective digital rights management - are intensively addressed. Many real-world commercial systems and prototypes are also introduced, as are software samples and integration examples, allowing readers to understand practical tradeoffs in the design of multimedia architectures, and get hands-on experience learning the methodologies and procedures. Balancing just the right amount of theory with practical design and integration knowledge, this book is ideal for graduate students and researchers in electrical engineering and computer science, and also for practitioners in the communications and networking industry. It can also be used as a textbook for specialized graduate-level courses on multimedia networking.
    No preview · Article · Jan 2009
  • [Show abstract] [Hide abstract]
    ABSTRACT: VoIP provided voice service using Internet. It is receiving footlights when it escapes an initial curiosity. Interest to VoIP became larger, because it can transfer existing phone service and deliver voice data through internet technology. Communication service providers introduce Next Generation Network and Broadband convergence Network with VoIP as an added service to the consumer. Moreover, a provision and activation for VoIP service were also regulated by law. Today, SIP standard (The signalring protocol for the Internet phone service) raises to be the standard technique because the expandability is high and complexity is low. It is widely investigated and actively advocated to use Signal ring protocol for SIP in VoIP service. SIP service can be applied even outside the Internet phone service; instance messaging and various multimedia technology are just an example. However, it is needed to ensure secret of VoIP call in a special situation. It is relatively difficult to eaves-drop the commonly used PSTN in that it is connected with 1:1 circuit. However, it is difficult to ensure the secret of call on Internet because many users can connect to the Internet at the same time. Therefore, this paper suggests a new model of Internet telephone for eavesdrop prevention enabling VoIP(using SIP protocol) to use the VPN protocol and establish the probability of practical use comparing it with Internet telephone.
    No preview · Article · Jan 2009
  • [Show abstract] [Hide abstract]
    ABSTRACT: Voice over Internet Protocol (VoIP) service has been a very popular and important application over the Internet. Recently, wireless mesh networks (WMNs) has been considered as a good solution for VoIP services due to low cost and convenience, easy deployment and larger area coverage. However, many relevant security issues have been raised for integrating IP Telephony into the existent applications and system infrastructure. In this paper, we propose a trust degree-based dynamic model for securing the VoIP over WMNs, in which each node maintains trust degree for other nodes and applies the trust degree to evaluate their trustworthiness. We also validate the performance of our model with simulation results
    No preview · Article · Apr 2009
Show more