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.

IM-CSI - IM – CAMEL Subscription Information

If an IMS subscriber has access to CAMEL services this will be indicated through IM-CSI (IM – CAMEL Subscription Information). This information is stored in the HSS and is passed on by the S-CSCF to the relevant IM-SSF.


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

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