• Rec. ITU-T F.600 (1988) – Service and operational principles for public data transmission services
  • 1 Introduction
  • 2 Terms
  • 3 Access to the service
  • 4 International data circuits/routes
  • 5 Duration of service
  • 6 Type of call
  • 7 Modes of operation
  • 8 Directories - compilation and supply
  • 9 Call progress signals on public data networks
  • 10 Quality of service
  • 11 Provision of customer support