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.

ASA - Access Sub-attempt

An Access Sub Attempt is a subsequent AA (Access Attempt) after the original AA has failed or not been responded to. It may involve a sequence of one or more APS (Access Probe Sequences) on the AC (Access Channel) and contains the same message content as the original AA.


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

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