Patent ID: 8223753
Filing Date: 2012-07-17
Classification: H04L

Abstract:
1. An apparatus for realizing an access of a legacy terminal to an Internet Protocol Multimedia Subsystem (IMS) system, wherein said IMS system has a Call Session Control Function (CSCF) entity comprising: a session control module that provides signaling interworking between terminal signaling and Session Initiation Protocol (SIP) signaling and controls terminal registration and session; a downlink signaling interface function module that provides signaling interaction with one or more legacy terminals, and provides legacy switch function for one or more legacy terminals operating under the control of said session control module; a downlink bearer interface function module that provides a media channel with the one or more legacy terminals; an uplink signaling interface function module that provides SIP signaling interaction with CSCF entity of an IMS core network, and provides SIP User Agent (UA) function for one or more legacy terminals operating under the control of said session control module; an uplink bearer interface function module that provides a media channel with an IMS carrier network; and a media interworking module that provides connection and media adaptation between the uplink bearer interface function module and the downlink bearer interface function module operating under the control of said session control module.