Billing is fundamental to any commercial VoIP services and it has direct impact on each individual VoIP subscriber. One of the most basic requirements of any VoIP billing function is that it must be reliable and trustworthy. From the VoIP subscriber’s perspective, VoIP billing should only charge them for the calls they have really made and for the duration they have called. Existing VoIP billin...

With the development of VoIP (Voice over IP) service, new security threats are expected to be appeared. However, existing IP network security solutions can not detect new VoIP specified network threats because they can not reflect characteristics of VoIP. In this paper, we propose a novel system that can monitor VoIP service and detect VoIP network threats practically. The proposed system colle...

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The Voice over Internet Protocol (VoIP) is designed for voice communications over IP networks. To use a VoIP service, an individual only needs a user name for identification. In comparison, the public switched telephone network requires detailed information from a user before creating an account. The limited identity information requirement makes VoIP calls appealing to criminals. In addition, ...

VoIP technology is becoming increasingly important as they gain market share in PSTN technology. In the short run, it is likely that VoIP technology will dominate the telecommunications market. This evolution towards VoIP technology makes sense for improving the VoIP technology efficiency under the auspices of the internet. However, the PSTN still provide voice quality better than the VoIP tech...

Voice over IP (VoIP) technology is being extensively and rapidly deployed. The flexibility and cost efficiency are the key factors luring enterprises to transition to VoIP. Some security problems may surface with the widespread deployment of VoIP. This article presents an overview of VoIP systems and its security issues. First, we briefly describe basic VoIP architecture and its fundamental dif...

The popularity of Voice over the Internet Protocol (VoIP) for providing voice communication over IP networks such as the Internet has resulted in VoIP becoming a global telephony service. VoIP applications convert analogue voice signals into a digital format, which is then encapsulated into IP packets for transmission over the Internet. Our research has examined both the security and privacy im...

Quality of Service in Enterprise VoIP Voice-Over-IP (VoIP) allows the convergence of voice and data traffic on the enterprise packet-based data network. Migration to VoIP telephony is accelerating: organizations upgrading or changing facilities are examining VoIP-based solutions. For those implementing VoIP, success depends on guaranteeing that “Quality of Service” (QoS) is equivalent to that p...

The transmission of voice-over-Internet protocol (VoIP) network traffic is used in an increasing variety of applications and settings. Many of these applications involve communications where VoIP systems are deployed under unpredictable conditions with poor network support. These conditions make it difficult for users to configure and optimize VoIP systems and this creates a need for self confi...