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| IP Multimedia Subsystem （IMS） is a new network architecture for providing multimedia service in the next generation networks. The 3rd Generation Partnership Project (3GPP) R5 standards specified the use of Internet Protocol version 6 (IPv6) for the IMS. However, early implementations of IMS Core and IMS clients support Internet Protocol version 4 (IPv4)-only. As the transition and migration to IPv6 of both the IMS Core and IMS clients, the interoperability between IPv4 and IPv6 in the Core region and clients region must be addressed. These issues have the potential to impact the access-independent nature of IMS specified by 3GPP. In this paper, we introduce a middleware which is similar to traditional Session Border Controller(SBC) between Core and clients, which can handle the inter-working well. And we introduce an Interconnect-SBC (I-SBC)-like middleware which can deal with the cross-IMS Cores communications. In addition, it also can provide other novel features such as ANAT, IPv6 promotion and make the implementation of User equipment mobility relatively easy. |
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| Keywords:IMS, SBC, IPv6, SIP |
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