Abstract
A communication system includes User Equipment ( 111) Radio Access Network (RAN) (121) a packet-switched domain ( 131) an IP Multimedia Subsystem (IMS) (141) a circuit-switched domain (151) a Domain Name System (DNS) (165) a Charging Gateway Function (CGF) (134) an EIR (135) a Transport Signaling Gateway (T-SGW) (146) and a Roaming Signaling Gateway (R-SGW) (147). The CS domain (151) includes an interworking Mobile Switching Center (iMSC) (201). The iMSC ( 201) translates the CS domain registration call control feature control and feature invocation procedures associated with the access technology to standard SIP procedures. The media gateway (MGW) (173 ) under the control of the iMSC (201) converts the air interface media flow into a packet stream that is managed by SIP procedures within the IMS (141). The iMSC (201) thereby allows for interworking between circuit-switched and packet-switched domains for call terminations.
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
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The information in purple was extracted from the FrandAvenue
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