NTT DoCoMo (
DCM), the largest wireless operator in Japan, together with its five vendors has developed major new specifications for a mechanism that delivers network-based value added services for IP Multimedia Subsystems (IMS).
Other members in this collaboration are Alcatel-Lucent (ALU), LM Ericsson AB (ERIC), Fujitsu Ltd., NEC Corp., and Nokia-Siemens Network; a joint venture of Nokia Corp. (NOK) and Siemens AG (SI). This mechanism includes a service composition component that coordinates various applications using IMS session management service.
IMS is a set of specifications that describes the next-generation networking architecture for implementing IP-based telephony and multimedia services. It defines a complete architecture and framework that enables the convergence of voice, video, data and mobile network technology over an IP-based infrastructure.
IMS uses Session Initiation Protocol (SIP) for easy integration with the Internet. This architecture was originally formulated to deliver Internet services over GPRS.
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