Interworking of MRBT Service in IMS and 3G CS Domain
IMS与3G电路域中多媒体彩铃业务的互通

IMS has been added to Telecommunication core network since 3GPP Release 5, which is committed to providing users with consistent services based on different networks. This paper briefly introduces the typical implementation and signalling flow of MRBT (Multimedia Ring Back Tone) service in IMS and 3G CS Domain, then it focuses on the interworking of MRBT services in these two networks.