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.

MSISDN - Mobile Station International ISDN Number

The Mobile Station International ISDN Number is the standard international telephone number used to identify a given subscriber. The number is based on the ITU-T (International Telecommunications Union-Telecommunication Standardization Sector) E.164 standard.


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

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