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GRUU - Globally Routable User agent URI

A GRUU is a IETF (Internet Engineering Task Force) term which describes an addressing scheme that associates an IMS Public Identity to the address of a particular UE (User Equipment). Using a GRUU, S-CSCF (Serving Call Session Control Function) will not have to fork requests to multiple UE registered to the same Public Identity.


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

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