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BSSAP - Base Station Subsystem Application Part

BSSAP is used to transfer Mobility Management and Session Management information between the BSS (Base Station Subsystem) and the MSC (Mobile Switching Centre) or MSS (Mobile Soft Switch). As such, BSSAP is split into two sub application parts – BSSMAP (Base Station Subsystem Management Application Part) and DTAP (Direct Transfer Application Part).


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

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