In February 2003, Cox Communications published “Preparing for the Promise of Voice over Internet Protocol (VoIP),” its first whitepaper on the subject. At that time, VoIP technology was still in its infancy and the need still existed to educate industry analysts and media, as well as our peers, on several fronts, including: the state of VoIP technology and its applications; Cox’s VoIP strategy ...

This contribution evaluates the security of VoIP networks. Potential threats to VoIP networks lead to unbearable risks which need to be eliminated by suitable countermeasures. However, cost and complexity of countermeasures should be adapted to the practical situation. Therefore the protection requirements are assessed. In this contribution the range of possible protection requirements is divid...

Voice Service Providers (VSPs) participating in VoIP peering frequently want to withhold their identity and related privacy-sensitive information from other parties during the VoIP communication. A number of existing documents on VoIP privacy exist, but most of them focus on end user privacy. By summarizing and extending existing work, we present a unified privacy mechanism for both VoIP users ...

——VoIP over Wireless LANs is greatly affected by path-loss, RF interference and other sources of signal attenuation in addition to network congestion. The primary factors involved in effective real-time communication, namely delay and loss, must be within certain controlled limits in such a scenario. Wireless LAN Access Points must, therefore, act in tune with the codecs to ensure high quality ...

With the growth of its popularity, VoIP is increasingly popular nowadays. Similarly to other Internet applications, VoIP users may desire to be unlinkable with their participated VoIP session records for privacy issues. In this paper, we explore the Items of Interests (IOIs) from anonymisation aspects based on a simplified VoIP model and analyse the potential links between them. We address poss...

We investigate whether the current best-effort technology of Internet stands up to the high quality standards of real-time voice communication. More precisely, we assess VoIP quality within the context of transport protocol support and efficiency. Initially, we focus on TCP and UDP supportive role from the perspective of VoIP performance. Applying our metric for real-time performance, we reach ...

The goal of this paper is to provide some feedback on a VoIP project in the German research network. During the last couple of years we build up and managed an unusual large testbed for VoIP applications in Germany. Several universities, research institutes, and companies tied together to allow a common usage to different local VoIP installations. The primary goal of the tests was to identify p...

Phone features, e.g., 911 call, voicemail, and Do Not Disturb, are critical and necessary for all deployed VoIP systems. In this paper, we empirically investigate the security of these phone features. We have implemented a number of attacks and experimented with VoIP services by leading VoIP service providers Vonage, AT&T and Gizmo. Our experimental results demonstrate that a man-in-the-middle ...

The voice signal in Voice over Internet protocol (VoIP) system is processed through the best effort policy based IP network, which leads to the network degradations including delay, packet loss jitter. The work in this paper presents the implementation of finite impulse response (FIR) filter for voice quality improvement in the VoIP system through distributed arithmetic (DA) algorithm. The VoIP...