Page C-2 NDA-24233 Issue 2Appendix C VisuaLink 128/384 Engineering Guide43 Access information discarded The network could not deliver access information; the type of
information discarded - for example, sub-address or protocol - may
be provided in the message.
44 Requested circuit/channel not available The requested circuit or channel is not available.
47 Resource unavailable, unspecified A resource is unavailable, and no other cause code applies.
50 Requested facility not subscribed The user has not subscrib ed to the requ ested service.
52 Outgoing calls barred The caller is not authorized to make calls.
54 Incoming calls barred The recipient has rejected the call.
57 Bearer capability not authorized The user is not authorized to use the requested capability.
58 Bearer capability not presently available The requested capability is not currently available.
65 Bearer capability not implemented The equipment does not support the requested capability.
66 Channel type not implemented The equipment does not support the requested channel type.
69 requested facility not implemented The equipment does not support the requested supplemental
service.
70 Only restricted digital information bearer
capability is available The equipment supports only the restricted version of a service
capability.
79 Service or option not implemented,
unspecified The service or option is not implemented, and no other ca us e co de
applies.
81 Invalid call reference value The call reference value does not match an existing call.
82 Identified channel does not exist The requested channel can n ot be assigned to the call - fo r example,
channel 13 through 23 have been requested, and the user has
subscribed only to channels 1 through 12.
83 A suspended call exists, but thi s call
identify does not The requested call can not be resumed because it does not
correspond to a suspended call.
88 Incompatible destination The requested call can not be accommodated because of protocol
differences or other incompatibili ties, such as data rate.
96 Mandatory information element is mi ssing The call can not be completed because a mandatory information
element is missing.
97 Message type non-existent or not
implemented The received message is not a recognized message type.
98 Message not compatible with call state, or
message type non-existent or not
implemented
The message can not be received while in the call state.
100 Invalid information element contents Information received could not be p rocessed because of incorrect ly
coded elements.
101 Message not compatible with call state The message received is not compatible with the call state.
102 Recovery on time expiry A recovery procedure has been initiated after the prescribed time.
127 Interworking, unspecified The message was triggered by internetworking with a network that
does not provide cause codes.
Table C: ISDN Q.931 Cause Code Definitions
Code Meaning Explanation