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Issue 2 - 07/00 A2-3
Appendix 2—Disconnection, Clearing & Error Codes
17 User busy
The called user cannot accept another call, although their
equipment is compatible, because there are no resources
available.
18 No user responding
The called user is not responding with either an Alerting or a
Connecting indication within the allowed period of time.
19 No answer from user (user alerted)
The called user’s equipment has responded with an Alerting
indication, but no Connecting indication has been received
within the allowed time.
21 Call rejected
The equipment will not accept this call, although it is not busy
or incompatible.
22 Number changed
The called number is no longer assigned.
26 Non-selected user clearing
The called user has not been awarded the incoming call.
27 Destination out of order
The requested destination cannot be reached because its
interface is not working properly. This may be because a
signalling message could not be delivered to the called user
(e.g. due to a physical or data link failure off-line), or because
the called DN has been manually placed in timer busy state.
28 Invalid number format
The called number is invalid or incomplete.
29 Facility rejected
The network cannot provide the requested facility.
30 Response to Status Enquiry
This cause is included in a Status message which has been sent
in response to a Status Enquiry message.
31 Normal, unspecified
This cause is used to report normal events only when no other
cause in the ‘normal’ class applies.