ISDN Disconnection Cause

This source of this ISDN cause is from ETS 300 102-1 Annex G. You can download the complete ETS 300 102-1 standard, the layer 3 basic call control, from the site www.etsi.org.

Normal Class

Code | Disconnection Cause
1 | Unallocated
2 | No route to specified transit network
3 | No route to destination
6 | Channel unacceptable
7 | Call awarded and being delivered in an established channel
16 | Nomal call clearing
17 | User busy
18 | No user responding
19 | No answer from user (user alerted)
21 | Call rejected
22 | Number changed
27 | Destination out of order
28 | Invalid formate (address incomplete)
29 | Facility rejected
30 | Response to status enquiry
31 | Normal, unspecified

Resource Unavailable Class

34 | No circuit/channel available
38 | Network out of order
41 | Temporary failure
42 | Switching equipment congestion
43 | Access information discarded
44 | Request circuit/channel not available
47 | Resource unavailable, unspecified

Service or Option not Available Class

49 | Quality of service not available
50 | Requested facility not subscribed
57 | Bearer capability not authorized
58 | Bearer capability not presently available
63 | Serice or option not available, unspecified

Service or Option not Implemented Class

65 | Bearer capability not implemented
66 | Channel type not implemented
69 | Requested facility not implemented
70 | Only restricted digital information bearer capability is unavailable
79 | Service option not implemented, unspecified

Invalid Message (e.g., parameter out of range) Class

81 | Invalid call reference value
82 | Identified channel does not exist
83 | A suspended call exist, but this call identify
84 | Call identity in use
85 | No call suspended
86 | Call having the requested call identity has been cleared
88 | Incompatible destination
91 | Invalid transit network selection
95 | Invalid message, unspecified

Protocol Error (e.g., unknown message) Class

96 | Mandatory information element is missing
97 | Message type non-existent or not implemented
98 | Message not compatible with call state or message type non-existent or not implemented
99 | Information element non-existent or not implemented
100 | Invliad information element contents
101 | Message not compatible with call state
102 | Recovery on timer expiry
111 | Protocol error, unspecified

Interworking Class

127 | Interworking unspecified

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