The basic message of connectionless SCCP (Signalling Connection Control Part) is the UDT (UNITDATA) message. When SCCP detects that a destination for a message is prohibited the UDT can either be discarded or returned to the originator as a UDTS (UNITDATA SERVICE).


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

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