Covid 19 Update: Given the current global situation, we have paused the delivery of our LiveOnsite courses, but our LiveOnline and OnlineAnytime Packages remain unaffected. Browse over 50 online courses in our course catalogue, or get in touch to register your interest in future LiveOnsite courses when we are able to safely resume in person training.

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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