IMPU - IMS Public User Identity

The Public User Identity is the means by which a subscriber of an IMS service is identified by other users of the service. For example, in VoLTE, the IMPU typically contains a representation of the subscriber’s telephone number. This could be in a SIP or Tel URI format.


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

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