Deploying IP telephony or voice over IP (VoIP) is a major and challenging task for data network researchers and designers. This paper outlines guidelines and a step-by-step methodology on how VoIP can be deployed successfully. The methodology can be used to assess the support and readiness of an existing network. Prior to the purchase and deployment of VoIP equipment, the methodology predicts t...

Article History: Received 5, May, 2015 Received in revised form 12, May, 2015 Accepted 6, June, 2015 Published online 28, June, 2015 VoIP (Voice Over Internet Protocol) is an advanced technology that has a great potential to develop new telecommunication with much lower cost and better QoS. VoIP, a new technology has been increasingly popular in recent times due to its affordability and reduced...

Voice communication carried out using the Internet Protocol (IP) for the transaction is known as Voice over Internet Protocol (VoIP). Voice over Internet Protocol is a technology for communicating using “Internet protocol” instead of traditional analog systems. Some VoIP services need only a regular phone connection, while others allows making telephone calls using an Internet connection instea...

As more and more people are using VoIP softphones in their laptop and smart phones, vulnerabilities in VoIP protocols and systems could introduce new threats to the computer that runs the VoIP softphone. In this paper, we investigate the security ramifications that VoIP softphones expose their host to and ways to mitigate such threats. We show that crafted SIP traffic (noisy attack) can disable...

The Voice over Internet Protocol (VoIP) services are currently present in our personal and professional activities and will be key services in Next Generation Networks (NGN). Hence, in order to keep and attract new customers, the quality of delivery for VoIP services needs to be measured and optimized to ensure Quality of Service (QoS) and Quality of Experience (QoE) support to users in future ...

The continuous development in the field of communication have paved the way for Voice over Internet Protocol (VoIP). VoIP is a group of hardware and software that facilitates people to utilize the Internet as the transmission medium for telephone calls by transmitting voice data in packets using IP instead of using conventional circuit transmissions of the Public Switched Telephone Network (PST...

An emerging killer application for enterprise wireless LANs (WLANs) is voice over IP (VoIP) telephony, which promises to greatly improve the reachability and mobility of enterprise telephony service at low cost. None of the commercial IEEE 802.11 WLAN-based VoIP products can support more than ten G.729-quality voice conversations over a single IEEE 802.11b channel on real-world WLANs, even thou...

For Internet Telephony to be a viable alternative to the Public Switch Telephone Network (PSTN), efficient and high quality communications are required. This paper proposes an optimization algorithm that selects parameters like coding scheme, packet loss bound, and maximum link utilization level in a Voice over IP (VoIP) network. The goal is to deliver guaranteed Quality of Service (for voice) ...

The objective of this research paper is to provide brief overview on simulative investigation on VOIP over WiMAX communication network for static environment. The mobile WiMAX (IEEE802. 16e) support VOIP traffic under different scenario, QOS, the system throughput, the packet delay,the signaling overhead,various design choices and performance analysis. This paper reports about the various VOIP ...

The Voice over Internet Protocol (VoIP) is increasing in popularity as a cost effective and efficient means of making telephone calls via the Internet. However, VoIP may also be an attractive method of communication to criminals as their true identity may be hidden and voice and video communications are encrypted as they are deployed across the Internet. This produces a new set of challenges fo...