The standardization work has been successfully achieved under the leadership of CableLabs, with the successful launch of DOCSIS 1.0 and 1.1 products, and the finalization of the DOCSIS 2.0 [1] specification. Definition of an interoperable Voice over IP architecture covering signaling, provisioning, security has been achieved [2], allowing MSO to deploy data and voice access systems on an econom...

The performance of unreliable voice transmission (Voice over IP) over wireless links is measured not by the throughput but by the perceptual speech quality. The speech quality is impaired by packet losses, which are common on wireless links, and by high transmission delays. In this paper, we describe the design and implementation of a novel Speech Property Based Booster that improves the qualit...

IP networks have been becoming more popular communication infrastructures due to the lower operational costs in recent years. Mainly, usage of IP networks in voice services, which is denominated by VoIP (Voice over IP), has made difference in telephony networks not only the way of the people’s communications, but also telecommunication companies’ and operators’ solutions. In this scope, IMS (IP...

We discuss the use of interleaving as a bandwidth efficient means of protecting audio streams from the effects of packet loss in the Internet. The adverse effects of interleaving on IP/UDP/RTP header compression are noted and a number of schemes which remedy this problem are discussed. Keywords— RTP, Interleaving, Voice-over-IP, header compression.

-This paper evaluates suitable voice-data length in IP packets for the adjustment of VoIP network systems. Based on measurements in a real environment, we examined the voice-quality level while varying the voice-data length of IP packets under various network conditions. We found that a VoIP system with long-voice data has high-transmission efficiency but there is a high deterioration in the vo...

In this paper, we evaluate available steganographic techniques for SIP (Session Initiation Protocol) that can be used for creating covert channels during signaling phase of VoIP (Voice over IP) call. Apart from characterizing existing steganographic methods we provide new insights by introducing new techniques. We also estimate amount of data that can be transferred in signalling messages for t...

Multiprotocol Label Switching (MPLS) is the latest technology in the evolution of routing and forwarding mechanisms for the core of the Internet. It ensures the reliable delivery of the Internet services with high transmission speed and lower delays. Traffic Engineering (TE) in MPLS is used for effectively managing the networks for efficient utilization of network resources. MPLS technology mak...

This paper presents simulation results outlining the behavior of rate-adaptive voice communications over IP networks. In the considered architecture, voice coders adapt their rate to the current state of the network, so as to generate only the bandwidth that the network is capable of carrying. An algorithm is proposed for driving the transmission rate of voice sources on the basis of estimation...

The Internet is under rapid growth and continuous evolution in order to accommodate an increasingly large number of applications with diverse service requirements. In particular, Internet telephony, or voice over IP is one of the most promising services currently being deployed. Besides the potentially significant cost reduction, Internet telephony can offer many new features and easier integra...

Over the last few years, the number of game players using voice communication to talk to each other while playing games has increased dramatically. Unlike traditional voice-over-IP technology, where most conversations are between two people, voice communication in games often has 5 or more people talking together as they play. We present the rst measurement study on the characteristics of multi...