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Publisher Summary This chapter provides a methodological description of the multimedia subsystem (IMS) network architecture. IMS service development requires thorough understanding of the principles and protocols of multimedia over IP and of the architecture of the IMS network. IMS is fully specified in 3GPP technical specifications (TSs). TSs may include reference to standard documents from other standardization organizations. Those other standard documents then become, in full or in part, an integral part of the IMS specification. The 3G (also HSPA, LTE) access network is fully specified by 3GPP. Other access networks use technology specified by other organizations, such as Ethernet, which is standardized by IEEE (IEEE standard 802.3), and ADSL, which is standardized by ITU. Session border controller (SBC) is the control-plane entity of the A-SBG. It is the “SIP entry” for the end-user terminal towards the IMS network. When A-SBG and P-CSCF are deployed as separate entities, this has impact on the ability to establish an IMS security association between UE and the IMS network. |
