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