Research on Initial Filter Criteria of IP Multimedia Subsystem

Abstract

IMS offers a unified service trigger mechanism, whose core is triggering the service to the corresponding SIP application server which based on initial filter criteria. Then the exclusive SIP application servers provide various valueadded multimedia services for the users. This paper researches how to create the exclusive service data which is Initial Filter Criteria, when a user receives an IMS subscription which contains specific value-added services. Then the SIP request initiated can be implemented routing to the appropriate application server accurately.