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• ITU-T Rec. Q.763 (1988)
• 1 General
  • 1.1 Routing label
  • 1.2 Circuit identification code
  • 1.3 Message type code
  • 1.4 Formatting principles
  • 1.5 Mandatory fixed part
  • 1.6 Mandatory variable part
  • 1.7 Optional part
  • 1.8 End of optional parameters octet
  • 1.9 Order of transmission
  • 1.10 Coding of spare bits
  • 1.11 National message types and parameters
• 2 Parameter formats and codes
  • 2.1 Message type codes
  • 2.2 Coding of the length indicator
  • 2.3 Coding of the pointers
• 3 ISDN user part parameters
  • 3.1 Parameter names
  • 3.2 Access transport
  • 3.3 Automatic congestion level
  • 3.4 Backward call indicators
  • 3.5 Call modification indicators
  • 3.6 Call reference
  • 3.7 Called party number
  • 3.8 Calling party number
  • 3.9 Calling party's category
  • 3.10 Cause indicators
  • 3.11 Circuit group supervision message type indicator
  • 3.12 Circuit state indicator
  • 3.13 Closed user group interlock code
  • 3.14 Connected number
  • 3.15 Connection request
  • 3.16 Continuity indicators
  • 3.17 End of optional parameters indicator
  • 3.18 Event information
  • 3.19 Facility indicator
  • 3.20 Forward call indicators
  • 3.21 Information indicators
  • 3.22 Information request indicators
  • 3.23 Nature of connection indicators
  • 3.24 Optional backward call indicators
  • 3.25 Optional forward call indicators
  • 3.26 Original called number
  • 3.27 Range and status
  • 3.28 Redirecting number
  • 3.29 Redirection information
  • 3.30 Redirection number
  • 3.31 Signalling point code (national use)
  • 3.32 Subsequent number
  • 3.33 Suspend/resume indicators
  • 3.34 Transit network selection (national use)
  • 3.35 Transmission medium requirement
  • 3.36 User service information
  • 3.37 User-to-user indicators
  • 3.38 User-to-user information
• 4 ISDN user part messages and codes