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The CSCF provides session control for subscribers accessing services within the IM (IP Multimedia) CN. In essence the CSCF is a SIP Server. It has responsibility for interacting with network databases such as the HSS for mobility and AAA (Access, Authorization and Accounting) Servers for security. As part of the SIP Registration process a user will be allocated a S-CSCF that will reside in the subscribers HPLMN and be responsible for all aspects of session control.
