PSI - Public Service Identity

With respect to the 3GPP IMS (IP Multimedia Subsystem), PSI are used to identify services which are hosted by an AS (Application Server), as opposed to Public User Identities, which identify an IMS subscriber. PSI can also be used to identify groups of IMS subscribers.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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