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.


The format of global switched telephone numbers are defined by the ITU-T (International Telecommunications Union – Telecommunications Standardization Sector) E164 standard. The 16 digit number is split into international, national and user number portions. For example +44 (0) 1344 724666.


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

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