A Review Paper
Computer Science Dept.
University of Agriculture Faisalabad
Security Issues with IP Multimedia Subsystem (IMS)
IMS started as a technology for 3rd Generation mobile networks (under the auspices of the 3rd Generation Partnership Project (3GPP), but it is now spreading to next generation wire line networks and is going to be a key to Fixed Mobile Convergence (FMC). It builds upon Session Initiation Protocol (SIP) which has emerged as the crucial technology for controlling communications in IP-based next generation networks (NGN).
IMS is about services and applications, enabling service providers to offer rich multimedia services across wireless, packet and traditional circuit switched networks. It is standards based and uses open interfaces and functional components that can be assembled flexibly into hardware and software systems to support real-time interactive services and applications. This paper provides you the overview of IMS architecture and its security challenges.
The basic set of standards for IMS implementation were released in 2004 and the first implementations are beginning in the European wireless markets. The standards organizations are heavily involved in developing standards to fill inevitable gaps and to add new capabilities. However IMS is still untested in real-life major carrier networks and its wide scale implementation are some years away. ITU-T definition: NGN is a packet based network able to provide services incl. telecom Services and able to make use of multiple broadband, QoS-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies. It offers unrestricted access by users to different service providers and generalized mobility.
References:  http://www.gtisc.gatech.edu/pdf/imswp.pdf  3GPP. Security architecture.  3GPP. Security aspects of early IP multimedia subsystem (IMS) (release 7). Technical Report TS 33.978 V7.0.0, June 2007.  http://en.wikipedia.org/wiki/IP_Multimedia_Subsystem