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The Internet Protocol Multimedia Subsystem (IMS) has been recognized as a common signaling architecture for providing next generation multimedia services. In order to enhance perceived service quality regardless of access network and device, IMS supports Quality of Service (QoS) negotiation and signaling. The IMS procedures used for that purpose are based on Session Initiation Protocol (SIP). Therefore,...
This article deals with security features of SIP and focuses on advanced authentication and key establishment methods. These methods are described and a proposal of comprehensive security for the SIP architecture is presented in this article. The solution provides strong secure authentication of SIP users and protects against various attacks occurring in the SIP architecture. Furthermore, our proposal...
The NGN (Next Generation Network), which can provide advanced multimedia services over an all-IP based network, has been the subject of considerable attention for several years. While there have been tremendous efforts to develop its architecture and protocols, especially for IMS, a key technology of the NGN, its wide deployment is still a long way off. However, efforts to create an advanced signaling...
With the proliferation of the high speed, broadband network technologies, the peer-to-peer (P2P) live multimedia streaming becomes more and more popular. In this paper, we proposed a SIP-based P2P multicast scheme for live multimedia streaming. By utilizing the SIP protocol, our proposed scheme not only minimizes the initial delay for playing live media streams but also reduces the infrastructure...
In this paper, we introduced a design and implementation of a SIP signal control framework as a medium between the service logic and SIP stack. It is used to establish different kinds of RTP connections controlled by SIP application server according to the service logic. Through this framework, a new operation can be easily reused and a signal control flow can be easily modified or added by modifying...
Nowadays, users are reachable through a number of telecommunication devices, network operators, as well as services and applications. The calling users if provided with the appropriate information can manually select the most suitable way of communication. Although this capability already affects existing business models, the lack of a transparent and a dynamic solution renders it hard to use. To...
Advance of charge at the end of conversation (AOCE) is a promising value-added service of telecommunication industry for the upgrading of telecommunication network to session initiation protocol SIP-based softswitch network. However, there is not a complete AOCE solution available for softswitch network. On the basis of softswith billing, the implementation of the signaling process of AOCE is studied...
Based on the ITU-T H.323 protocol, the traditional multimedia conference is complicated in application and poor in scalability. Neither its reusability is not good enough. After analysis of SIP protocol, a component-based development method is put forward. Most of the function is implemented in component form. And applying function hierarchy approach for different function layers to obtain a clear...
Identity federation is a key requirement for today's distributed services. This technology allows managed sharing of users' identity information between identity providers (IDP), and subsequently, the use of federated identities to access service providers (SP). Single sign-on (SSO) is a core feature provided by these systems. The Session Initiation Protocol (SIP) is a signaling framework for session...
Session initiation protocol (SIP) has potential to be selected as a control plane signaling protocol for delivering real-time multimedia applications in military networks. It is necessary to study behaviors of SIP and SIP-based real-time applications as well as to understand their limitations in a tactical network environment. The goals of this study are to assess SIP signaling protocol performance...
The IP multimedia subsystem (IMS), originally designed by 3GPP and later updated by 3GPP, 3GPP2 and TISPAN, presents itself as an architectural framework that allows the convergence of the Internet, wireless and wireline networks and a global platform for the delivery of IP multimedia applications in next generation networks (NGN). One of the most used services to test IMS capabilities is push-to-talk...
After acquiring a new Internet protocol (IP) address due to a vertical handover, IP multimedia subsystem (IMS) subscriber has to send session initiation protocol (SIP) messages for registration and session setup to keep an ongoing session. In this paper, we call this registration and session setup delay 'IMS delay.' We show that the IMS delay is unacceptable for supporting real-time applications in...
In this paper, we present a system and method for providing an SIP (Session Initiation Protocol) based conference service; and, more particularly, to a system and method for providing a SIP based conference service, which improves user convenience by providing a way that user does not need to remember the temporary conference URI during creation and participation of conference session.
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