Time, day, location and instantaneous network conditions largely dictate the quality of Voice over IP calls. In this paper we present results of VoIP quality mainly in terms of packet jitter and loss. This work revisits our objective of measuring VoIP quality in 1999 enabling us to make comparisons with the results we obtained three years ago. It also allows us to improve the measurement infra-...

In this paper, we studied the Voice over IP Quality of Service measurement techniques and Quality of Service implementations. We find out techniques that gives better Quality as well as their weaknesses. We have studied E-Model, Mean Opinion Score (MOS) optimization and other traditional algorithms as well as soft computing methods to find Quality of Service of Voice over IP. A thorough study o...

Recent Voice over Internet Protocol (VoIP) technology is attracting more and more attention and interest in the industry. VoIP applications such as IP telephony systems involve sending voice transmissions as data packets over private or public IP networks as well as reassembled and decoded on the receiving side. Security concerns are always the major barrier that prevents many businesses from e...

Voice over Internet Protocol (VoIP) is a rapidly emerging technology. Currently, the Internet is being wired to support voice and fax traffic. The widespread interest in VoIP is not necessarily the ability of IP to carry voice traffic but the ability to carry voice and fax traffic over data networks. The implications of this are far-reaching. That is, the Internet, for the most part, will event...

Voice-over-DSL (VoDSL) technology provides a major boost to competition in local telephony market by greatly reducing the cost of local access. VoDSL leverages the high-speed transmission of DSL technology to deliver multiple telephony circuits plus high-speed data over a single loop. Although the data services delivered over xDSL are usually IP-based, native ATM is the ideal technology choice ...

We discuss a systematic approach to network forensic collection and analysis of data in converged networks. Since attacks cannot be completely avoided, it is necessary to have appropriate forensics systems. Upon integration into a network forensic infrastructure, we expect this forensic model will enable a faster response and more structured investigations of Voice over IP (VoIP)-based network ...

The presence of voice-over-IP traffic in the Internet is constantly increasing, as it offers improved connectivity and quality-of-service comparable to classical telephony at costs that the rival circuit-switched telephony systems cannot match. This paper evaluates the audio quality of voice-overIP calls that use the Datagram Congestion Control Protocol (DCCP), a congestion-controlled alternati...

– This paper compares VoATM and VoIP in terms of their suitability for carrying voice traffic over DSL. ATM is currently the preferred protocol due to its built-in QoS mechanisms. Through simulations we show that IP QoS mechanisms can also be used to achieve comparable performance for voice traffic over DSL. Our performance metrics are the ETE delay of voice packets across the DSL access networ...

This paper introduces a novel method of approximate calculation of delay in voice over IP systems. The proposed method relies on mathematical operations like interpolation and integration to produce a continuous function. This continuous function shows the delay in different times. The paper shows a detailed example of applying this method successfully to a sample call. The resulting delay func...

For the transmission of voice traffic in IP-networks the commonly used protocol suite for realtime data transfer in IP-networks leads to a very large protocol overhead for voice data and a poor utilization of the bandwidth for user data. Multiplexing several flows on a route into one IP packet overcomes this problem. In the future UMTS, realtime traffic like voice and circuit switched data are ...