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• CCITT Rec. U.202 (11/1988) – REQUIREMENTS TO BE MET IN PROVIDING THE TELEX SERVICE WITHIN THE ISDN
• 1 Scope
• 2 Configuration models
  • 2.1 Two configuration models may be developed:
• 3 General principles
  • 3.1 Minimum integration model
  • 3.2 Maximum integration model
• 4 Call establishment sequences
  • 4.1 Minimum integration model
  • 4.2 Maximum integration model
• 5 Terminal adapter functions
• 6 Adapter unit
• 7 Interworking facility functions
• 8 Other telex service features