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IP Multimedia Subsystem
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===== Public Service Identity ===== Public Service Identities (PSI) are identities that identify services, which are hosted by application servers. As user identities, PSI takes the form of either a SIP or Tel URI. PSIs are stored in the HSS either as a distinct PSI or as a wildcarded PSI: * a distinct PSI contains the PSI that is used in routing * a wildcarded PSI represents a collection of PSIs.
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