Norstar Cause Codes

Find by Cause Code number:

• 0
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 26
• 27
• 28
• 29
• 30
• 31
• 34
• 35
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 46
• 47
• 49
• 50
• 52
• 53
• 54
• 55
• 57
• 58
• 62
• 63
• 65
• 66
• 69
• 70
• 79
• 81
• 82
• 83
• 84
• 85
• 86
• 87
• 88
• 90
• 91
• 95
• 96
• 97
• 98
• 99
• 100
• 101
• 102
• 103
• 110
• 111
• 127
• 128

A Call clearing Code will appear on a Norstar set when a call is placed over a PRI circuit.
Call clearing Codes are useful for diagnostic purposes, as they show exactly why an ISDN call has been released.

Call clearing Codes are also known as:

• ISDN Event Cause Codes
• Bellcore Standard ISDN Cause Codes
• SS7 Cause Codes

Cause codes can be enabled on by going into:

System programming ➤ Release reasons ➤ Text: Simple ➤ Cause code: Y

Select one of the following settings: Text: None (default) or Detailed
(Installer password is required).

The Q.931 Cause Values are grouped into the following classes:

Normal events:	Cause 1-31
Resource unavailable:	Cause 32-47
Service or option not available:	Cause 48-63
Service or option not implemented:	Cause 64-79
Invalid message:	Cause 80-95
Protocol error:	Cause 96-111
Internetworking:	Cause 112-127

The most commonly seen codes are 16 (normal disconnect) and 17 (busy).
Full list of Cause codes and definitions: ISDN Cause Codes

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