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ICSI - IMS Communication Service Identifier

Any IMS Communication Service must be identified using an ICSI. As an example, the IMS MMTel Communication Service (upon which VoLTE is based), is identified using the urn-xxx:3gpp-service.ims.icsi.mmtel ICSI.


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

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