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The User Equipment (UE) gets access to the IP multimedia services supported by the application servers (AS) residing in the home network, by first sending a Session Initiation Protocol (SIP) request towards Proxy Call and Session Control Function (P-CSCF). IP Multimedia core network Subsystem (IMS)įigure 1 shows a high-level architecture of IMS. The report, moreover, shows IMS architecture in combination with the architecture of Long-Term Evolution (LTE) network.

This report is a high-level overview of IMS by studying three simplified call flows for IMS registration, session setup, and standalone transaction.

Long-Term Evolution (LTE) and IMS Introductionģ rd Generation Partnership Project (3GPP) defined IP Multimedia Subsyste or Internet Protocol Multimedia core network Subsystem (IMS) as a common platform to access different applications, thereby making it easier for a user to access and maintain ownership of subscribed applications when changing operator. IP Multimedia core network Subsystem (IMS)Ħ. Long-term Evolution (LTE) and IP Multimedia Subsystem (IMS) ContentsĢ.

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