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.


ITU-T (International Telecommunications Union-Telecommunication Standardization Sector) standard G.723.1 defines codecs for low bit rate speech. The bit rates are 5.3Kbps and 6.3Kbps and are rates employed in VoIP (Voice over IP) systems such as H.323 and SIP (Session Initiation Protocol).


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

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