In recent years, there are growing interests to provide telephone services over the Internet. In particular, Internet Services Providers (ISPs) may become the next generation telephone company especially in providing international telephone services. This paper proposes a novel method called quantum IP (QIP) for transporting international voice traffic over the Internet via QIP routers. Emulati...

Voice-over-IP (VoIP) is one of the main applications or services, which dramatically increased the spread and usage of the Internet. VoIP describes the transmission and reception of voice and video data over networks that use the “internet protocol” (IP) as transport protocol. With the use of VoIP within company networks (intranet) investors hope to reduce the expenses for infrastructure and ma...

We discuss the technical viability of transporting real-time voice over IP networks when the output rate of the speech encoder is adjusted to match the characteristics of the network: speech is coded at low bit rates when the network is congested; at higher bit rates, otherwise. First, issues affecting perceptual QoS are analyzed. The rationale for Adaptive Voice over IP (AVoIP) is explained an...

I n general, “spam” describes information, often dubious in nature, sent to numerous recipients without their prior consent. Although the term typically refers to emails about hot stocks, revolutionary medicine, or adult content, spam can apply to all kinds of messages. Examples range from telemarketing calls and short message service texts to bulk mail and faxes. Since the first incident in th...

This paper discusses about transmission of Voice over Mobile IP. It is basically about transmitting voice over Mobile IP unlike the usual standard IP protocol. It discusses the key issues related to the Voice over IP and the standard protocols supporting it. It discusses how the protocols SIP, RTP are modified to attain the mobility of the protocols. Here we discussed about SIP mobility, RTP mo...

The emergence of packet networks for both data and voice traffic has introduced new challenges for speech transmission designs that differ significantly from those encountered and handled in traditional circuit-switched telephone networks, such as the public switched telephone network (PSTN). In this chapter, we present the many aspects that affect speech quality in a voice over IP (VoIP) conve...

The mechanisms which enable the vast majority of computer attacks are based on design and programming errors in networked applications. The growing use of voice over IP (VOIP) phone technology makes these phone applications potential targets. We present a tool to perform security testing of VOIP applications to identify security vulnerabilities which can be exploited by an attacker. Session Ini...