Issue 2 - 07/00 A2-7
Appendix 2—Disconnection, Clearing & Error Codes
101 Message not compatible with call state
The equipment has received a message which is not compatible
with the current call state.
102 Recovery on time expiry
No further call progress in call establishment has been
received, and the call has timed out. An associated Q931 error
handling procedure has been initiated.
111 Protocol error, unspecified
This cause is used to report a protocol (call control) error, only
when no other cause in the ‘protocol error’ class applies.
127 Interworking, unspecified
There has been interworking with a network which does not
provide cause codes for its actions. Therefore, the precise
cause for clearing is not known.
1TR6 external codes
1 Invalid call reference value
3 Bearer service not implemented
7 Call identity does not exist
8 Call identity in use
10 No channel available
16 Requested facility not implemented
17 Requested facility not subscribed
32 Outgoing calls barred
33 User access busy
34 Connection not possible due to Closed User Group (CUG)
37 Connection not possible
53 Destination not obtainable
56 Number changed
57 Out of order
58 No user responding
59 User busy
61 Incoming calls barred
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