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.

SDL - Specification and Description Language

Specification and Description Language is an object-oriented, formal language defined by the ITU-T (International Telecommunications Union-Telecommunications Standardization Sector).The language is intended for the specification of complex, event driven, real time, and interactive applications involving many concurrent activities that communicate using discrete signals.


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

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