Mike's PBX Cookbook

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:

Cause codes can be enabled on by going into:

System programming Release reasons Text: Simple Cause code: Y

Normally, you will use 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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