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• ITU-T Rec. Q.85.1 (1988) – COMMUNITY OF INTEREST SUPPLEMENTARY SERVICES – CLOSED USER GROUP
• 1 Closed user group
  • 1.1 Introduction
  • 1.2 Definition of functional model
    • 1.2.1 Functional model description
    • 1.2.3 Relationship to basic service
  • 1.3 Information flow description
    • 1.3.1 Information flow diagrams
    • 1.3.2 Definition of individual information flows
  • 1.4 Functional entity actions
  • 1.5 SDL diagrams for functional entities
    • 1.5.1 FE1 originating CUG agent
    • 1.5.2 FE2 outgoing CUG determination
    • 1.5.3 FE3 outgoing CUG control
    • 1.5.4 FE 4 incoming CUG determination
    • 1.5.5 FE5 incoming CUG control
    • 1.5.6 FE6 destination in CUG agent
    • 1.5.7 Basic call hooks
  • 1.6 Network physical allocation scenarios