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• CCITT Rec. Q.100 Supplement 2 (11/1988) – CHARACTERISTICS OF SPEECH INTERPOLATION SYSTEMS AFFECTING SIGNALLING
• 1 CELTIC system
  • 1.1 General
  • 1.2 Summary description of CELTIC
  • 1.3 Links between CELTIC and the transit centre
  • 1.4 Operation of CELTIC with different types of signalling
• 2 DSI characteristics
• 3 TASI characteristics affecting signalling
• References