In this paper we are proposing an effective encryption technique for high volume streaming data which has been sent over various communication links throughout the network. Applications requiring high volume of streaming data transmission include audio-video conferencing or Voice over Internet Protocol (VoIP) and Internet Protocol Television (IPTV). In general, whenever we use these types of ap...

Voice over the Internet protocol (VoIP) is being rapidly deployed, and the convergence of the voice and data worlds is introducing exciting opportunities. Lower cost and greater flexibility are the key factors luring enterprises to transition to VoIP. Some security problems may surface with the widespread deployment of VoIP. In this article, we discuss these security problems and propose a high...

In Local Area Networks (LAN) connected together by bridges, flow control and smooth traffic in the network is very important. However, congestion at bridges can cause intensive loss of received frames. In addition, the received frames are thrown away and have to be retransmitted by the source station, which causes more congestion and massive reduction in the overall network throughput. The netw...

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...

In this thesis, we focus on large scale Voice over IP (VoIP) deployment over heterogeneous Internet environments. We first present an overview of VoIP coding and transmission mechanisms. Then, we investigate performance limitations in the case of a large number of VoIP flows transported over wired Internet links between peer VoIP gateways. We address, in the first part of the thesis, the need t...

Due to the growing demand for VoIP (Voice over Internet Protocol) services, researches on VoIP design have attained more and more attention. Compared with a traditional voice service PSTN (Public Switched Telephony Network), VoIP is able to provide lower cost and more flexibility. However, there are still many challenging issues to guarantee a consistent and good quality of voice connection ove...