Voice over Internet Protocol (VoIP) products is an emerging technology that can contain forensically important information for a criminal activity. Without having the user name and passwords, this forensically important information can still be gathered by the investigators. Although there are a few VoIP forensic investigative applications available in the literature, most of them are particula...

Voice-over-Internet protocol (VoIP) is an emerging technology that is beginning to replace traditional telephone services because it is much more cost effective for the consumer and businesses. Long distance charges are relatively a thing of the past, and in general there are more feature-rich services available over a VoIP line than traditional phone services. VoIP provides phone services with...

Voice over Internet Protocol (VoIP) is a service from the internet services that allows users to communicate with each other. Quality of Service (QoS) is very sensitive to delay so that VOIP needs it. The objective of this research is study the effect of different queuing algorithms within the router on VoIP QoS. In this work, simulation tool “OPNET Modeler version 14.0” is used to implement th...

Title of Thesis : AN ALGORITHM TO EVALUATE THE ECHO SIGNAL AND THE VOICE QUALITY IN VOIP NETWORKS Andre Neumann Kauffman, M.S., 2006 Directed By: Associate Professor, Steven A. Tretter, Department of Electrical and Computer Engineering Voice over the Internet Protocol (VoIP) has been increasingly popular, but reliability and voice quality remain important factors that limit the widespread adopt...

With the arising of telephony over the internet, loads of institutes start looking at that new technology. They ask themselves for sense and meaningful use. Many questions appeared to be answered first. The first one is about the interoperability of the end systems. It should be possible to change the vendor and implement the new devices without any problems into the existing VoIP infrastructur...

WiMAX system is based on OFDMA, and it is very suitable for VoIP traffic. At the same time, aggressive AMC and frame bundling are two important techniques to improve the performance of VoIP, and so they are applied to WiMAX system in this paper. The simulation results show that when the system is in short of bandwidth, these two techniques indeed reduce the PER and delay jitter of the VoIP user...

Authentication is an important mechanism for the reliable operation of any Voice over IP (VoIP) infrastructure. Digest authentication has become the most widely adopted VoIP authentication protocol due to its simple properties. However, even this lightweight protocol can have a significant impact on the performance and scalability of a VoIP infrastructure. In this paper, we present Proxychain –...

The rapid growth of computing, the Internet and telecommunications systems have resulted in a broad range of ways to communicate and access information. Voice over Internet Protocol (VoIP) is a Computer Telephony Integration (CTI) solution that transports voice traffic over a data network as an alternative to the Plain Old Telephone Service (POTS). VoIP products promise converged telecommunicat...

VoIP services are scarifying, due to delay in transmission of voice packets (Latency), echo, jitter, packet loss and other Quality of Service (QoS) problems arrived in VoIP phones. The weakness on QoS is managing by voice and data service together on a VoIP network. In this paper we dedicated to studying the response of data transmission quality, characteristic of voice quality, the service qua...

Our focus is on organizations that deploy and troubleshoot voice over IP (VoIP) networks. These groups may be professional services or pre-and post-sales engineering groups. A big problem with VoIP is the quality of calls, which is most affected by convergence with existing data network traffic. In most scenarios, the data network will require tuning in order to achieve acceptable quality for v...