T-CSI - Terminating – CAMEL Subscription Information

CAMEL operation requires additional CSI (CAMEL Subscription Information) to be included as part of a mobile subscriber’s subscription information in the HLR. This will be forwarded to the appropriate VLR when the mobile attaches and moves around the network. There are two types of CSI these are O-CSI (Originating – CAMEL Subscription Information) and T-CSI (Terminating – CAMEL Subscription Information). The later phases of CAMEL include many variations of CSI.


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

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