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• ITU-T Rec. Q.780 (1988)
• 1 General
• 2 General principles of test specifications
• 3 Scope of the test specification
• 4 Field of application
• 5 Method of application
  • 5.1 Validation testing
  • 5.2 Compatibility testing
  • 5.3 Test configuration
• 6 Functional requirements imposed by the test specification
  • 6.1 Level 1
  • 6.2 Level 2
  • 6.3 Level 3
  • 6.4 TUP
• 7 Signalling link monitor(s)