Cellular Wireless Wide Area Networks (WWANs) are most prevalent and offer highbandwidth data transfer. We believe WWANs can be availed for voice communications employing Voice Over IP technologies. Such a communication will be of better quality and offer higher resilience compared to voice communication over a cellular phone (using cellular voice networks). We present a Quality of Service analy...

Voice over IP (VoIP) is becoming very popular due to the huge range of services that can be implemented by integrating different media (voice, audio, data, etc.). Besides, voice-enabled interfaces for those services are being very actively researched. Nevertheless the impoverishment of voice quality due to packet losses severely affects the speech recognizers supporting those interfaces ([8]). ...

The Internet has burgeoned into a worldwide information superhighway during the past few years, giving rise to a host of new applications and services. Among them, Voice over IP (VoIP) is the most prominent one. Beginning more as a frolic among computer enthusiasts, VoIP has set off a feeding frenzy in both the industrial and scientific communities and has the potential to radically change tele...

Providing hard quality of service guarantees for Voice over IP traffic in multi-service IP networks is quite costly in terms of network resources. However, if one is willing to slightly soften the guarantees and to accept a small probability of service degradation, the amount of capacity necessary for voice traffic can be greatly reduced. In this paper, we investigate the tradeoff between quali...

Voice packets with guaranteed QoS (Quality of Service) on the VoIP system are responsible for digitizing, encoding, decoding, and playing out the speech signal. The important point is based on the factor that different parts of speech over IP networks have different perceptual importance and each part of speech does not contribute equally to the overall voice quality. In this paper, we propose ...

I nternet telephony, also known as voice over IP, may finally be ready for prime time in 2004. An increasing number of IP telephony providers , traditional phone carriers, and now cable companies—includingage—are offering a growing range of corporate and residential services nationwide. Internet telephony is attractive to customers because it uses lower-cost equipment and is less expensive to o...

Multiprotocol Label Switching technology is an evolving technology that provides the reliable and efficient distribution of the Internet services with high transmission speed and lower delays. The important feature of MPLS network is its Traffic Engineering (TE), which is used to manage the computer network effectively for efficient utilization of network resources such as bandwidth, link utili...

This paper presents a framework for managing voice quality in converged voice and data networks containing Internet Protocol based phones (IP phones). It introduces IP phones with voice quality monitoring and testing capabilities. These IP phones support network management capabilities without using conventional network management protocols (e.g., SNMP). Our framework provides basis for support...

The two major standards in the multimedia services over IP area are the protocol suites H.323 (ITU-T) and SIP (IETF).Both have emerged as competing protocol standards for the signaling and call control of IP telephony. SIP is designed with a broader scope, offering functions specifically designed to enable easy extensions; it should be the advantage for new potential services. H.323 is still th...

In this paper, a high dimensional chaotic systems based mixed keystream generator is proposed to secure the voice data. As the voice-based communication becomes extensively vital in the application areas of military, voice over IP, voice-conferencing, phone banking, news telecasting etc. It greatly demands to preserve sensitive voice signals from the unauthorized listening and illegal usage ove...