Realizing service composition in the IP Multimedia Subsystem

Developed by the 3(rd) Generation Partnership Project, the IP Multimedia Subsystem is a set of standards that enable: the delivery of rich multimedia services in Next Generation Networks. One way of taking advantage of the flexibility that IMS provides, consists on effectively manage the interoperability and cooperation between the deployed services, in order to provide a high level of service customization to subscribers. To realize these goals, service composition, conceptualized as the ability of building new services from previously existing ones, has to be enabled in the IMS. Taking as starting point the potential architectural requirements compiled in 3GPP TR 23.810 for a brokering function, this paper presents some ideas to realize service orchestration based on the techniques and procedures already defined for the IMS.