Session Control in the IP Multimedia Subsystem

              The IP Multimedia Subsystem (IMS) defined by 3GPP provides an enabling architecture that is access independent. This is central in the move towards convergence. Now each access type is being 'enabled' to work with a multimedia IMS core, be it DSL, WLAN, GPRS or emerging technologies, such as WiMAX.
 

IP Multimedia Subsystem

             The IP Multimedia Subsystem (IMS) is an architectural framework for delivering internet protocol (IP) multimedia to mobile users. It was originally designed by the wireless standards body 3rd Generation Partnership Project (3GPP), and is part of the vision for evolving mobile networks beyond GSM. Its original formulation (3GPP R5) represented an approach to delivering "Internet services" over GPRS. This vision was later updated by 3GPP, 3GPP2 and TISPAN by requiring support of networks other than GPRS, such as Wireless LAN, CDMA2000 and fixed line.