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  • Foreword
  • 1 Scope
  • 2 References
  • 3 Definitions and abbreviations
  • 4 Architecture
  • 5 Information flows
  • 6 Principles for interactions with supplementary services
  • 7 Functional requirements of network entities
    • 7 Functional requirements of network entities
    • 7.1 MO call
      • 7.1.1 Functional requirements of serving MSC
      • 7.1.2 Functional requirements of VLR
    • 7.2 Retrieval of routeing information for MT call
      • 7.2.1 Functional requirements of GMSC
      • 7.2.2 Functional requirements of HLR
      • 7.2.3 Functional requirements of VLR
      • 7.2.4 Functional requirements of MSC
    • 7.3 MT call
      • 7.3.1 Functional requirements of serving MSC
      • 7.3.2 Functional requirements of VLR
  • 8 Contents of messages

7.2.4 Functional requirements of MSC

03.183GPPBasic call handlingRelease 1998TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

7.2.4.1 Process OSI_MSC

If the MS is engaged on a circuit-switched call, the state is busy, otherwise assumed idle.

Figure 58: Process OSI_MSC