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One of the main goals of moving to Next Generation Networks (NGN) is an integrated access to multimedia services like VoIP, and IPTV. The primary signaling protocol in these multimedia services is Session Initiation Protocol (SIP). This protocol, however, is vulnerable against attacks, which may reduce the Quality of Service (QoS), an important feature in NGN services. One of the most frequent attacks...
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 3rd generation partnership project (3GPP) and 3GPP2 have standardized the IP multimedia subsystem (IMS) to provide ubiquitous and access network independent IP-based services for next generation networks via merging cellular networks and the Internet. The application layer Session Initiation Protocol (SIP), standardized by 3GPP and 3GPP2 for IMS, is responsible for IMS session establishment, management,...
SIP (Session Initiation Protocol) plays a very important role in softswitch which is the core technology of the NGN (Next Generation Network). NAT (Network Address Translator) traversal for SIP has been the exchange of operational impact on the rapid popularization of softswitch service. In this paper, we introduce SBC (Session Border Controller) and ALG (Application Level Gateway), which are recognized...
IP Multimedia Subsystem (IMS) is a new network architecture for providing multimedia service in the next generation network. 3GPP R6 standards specified that both Internet Protocol version 6 (IPv6) and Session Initiation Protocol (SIP) are default protocols. So IMS network needs to interwork with the early deployed Internet Protocol version 4 (IPv4)-based IMS clients. In this paper, we introduce a...
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.
The IP multimedia subsystem (IMS) relies on the session initiation protocol (SIP) protocol for call management and signaling. The SIP protocol defines several types of request messages for its operation. A call setup, for instance, involves SIP INVITE request, which often generates message exchanges across multiple SIP proxies before the call is established. While requests such as INVITE are initiated...
This paper describes a framework for consent- based communications in SIP. This framework allows users to grant or deny SIP entities permission to communicate with those users. Consent-based communications prevent some types of amplification-based denial of service attacks and can be used to alleviate the effects of spam in SIP. This paper also presents the results of our experiments implementing...
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