session initiation protocol (sip) is the main signaling protocol of next generation networks (ngn). sip based applications are usually deployed over the internet, for which their text-based nature and internal stateful operation make them vulnerable to different types of attacks. the real‑time functionality of sip based applications make their related security systems more complex. on the other...

IP Multimedia Subsystem (IMS) as the core of Next Generation Network (NGN), its security is vital important. However, IMS is a network with openarchitecture based on IP, which brings a lot of security issues. There has already some research results about IMS security, but systematic and model-based research results are lacked. Based on TVRA method, this paper establishes a comprehensive vulnera...

The trend of Next Generation Networks’ (NGN) evolution is towards providing multiple and multimedia services to users through ubiquitous networks. The aim of IP Multimedia Subsystem (IMS) is to integrate mobile communication networks and computer networks. The IMS plays an important role in NGN services, which can be achieved by heterogeneous networks and different access technologies. IMS can ...

The IP Multimedia Subsystem (IMS) infrastructure is currently considered to be the main core of Next Generation Networks (NGNs), integrating IP and other network types under one common infrastructure. Consequently, IMS inherits security flaws and vulnerabilities residing in all those technologies. Besides, the protection against unauthorized access in NGN services is of great importance. In thi...

The IMS (IP Multimedia Subsystem) architecture is the key control for next generation networks (NGN). IMS gives network operators the opportunity to extend their services, including voice and multimedia communications and deliver them in new environments with new goals. Its security is paramount, especially authentication. In IMS, authentication is divided into two phases a PS (Packet-Switch) d...

In this paper we share our experiences on establishing, running, and extending a Next Generation Network (NGN) and IP Multimedia Subsystem (IMS) testbed. The testbed has been designed based on the layered architecture of NGNs and aims at satisfying Information and Communication Technology (ICT) industry requirements for open and flexible testing infrastructures. In the center of this telecommun...

One of the major issues in the future Internet is the integration of telecom networks with the Internet. In many countries, large Internet Service Providers (ISPs) are also telecom operators that have been focusing on providing Internet services through their telecom networks with telecom-grade mechanisms. In this article, we show that IP Multimedia Subsystem (IMS) is a telecom-grade mechanism ...

The main evolution trends of NGN architecture towards unified service control based on IMS principles are presented in the article. The actual implementation of NGN testbed platform including extensions and integration of application is described. We also provide an overview of the ongoing incorporation and integration of IMS core elements within the actual architecture. The existing NGN soluti...

The Next Generation Networks (NGN) aims to integrate for IP-based telecom infrastructures and provide most advance & high speed emerging value added services. NGN capable to provide higher innovative services, these services will able to integrate communication and Web service into a single platform. IP Multimedia Subsystem, a NGN leading technology, enables a variety of NGN-compliant communica...