Due to the rapid growth of the internet, customers request more applications over internet such as telephony and video. VoIP (Voice over Internet Protocol) is an emerging technology for voice communication which deploys many techniques to produce a high-quality service. Signaling is one of success keys of Voice over IP; the two most promised approaches in this case are H.323 and SIP. This paper...

In this paper new, lightweight security and control protocol for Voice over Internet Protocol (VoIP) service is presented. It is the alternative for the IETF’s (Internet Engineering Task Force) RTCP (Real-Time Control Protocol) for real-time application’s traffic. Additionally this solution offers authentication and integrity of voice send and it is capable of exchanging and verifying QoS and s...

Today's era of packet switched networks demands larger bandwidth to suffice the need to integrate multimedia applications like Internet gaming, transmission of voice etc. It becomes necessary to judge the network performance with the allocated bandwidth. Network performance depends mainly on the efficiency of the protocol used in addition to load on the network, the transmission system typ...

Today, Voice over Wireless Local Area Network (VOWLAN) is the most accepted Internet application. There are a large number of literatures regarding the performance of various WLAN networks. Most of them focus on simulations and modeling, but there are also some experiments with real networks. This paper explains the comparison of performance of two different VOIP (Voice over Internet Protocol) ...

Today Voice over Internet Protocol (VoIP) is used in large scale to deliver voice and multimedia over the packet data networks, such as the Internet. The Session Initiation Protocol (SIP) is widely used as a signalling protocol for VoIP. As SIP is being used more, the security of it is an important issue. In this paper, we concentrate on user authentication in SIP. We examine current solutions ...