Appendix CVisuaLink 128/384 Engineering Guide

Table C: ISDN Q.931 Cause Code Definitions

Code

Meaning

Explanation

 

 

 

 

 

The network could not deliver access information; the type of

43

Access information discarded

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 subscribed to the requested 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

The equipment supports only the restricted version of a service

capability is available

capability.

 

 

 

 

79

Service or option not implemented,

The service or option is not implemented, and no other cause code

unspecified

applies.

 

 

 

 

81

Invalid call reference value

The call reference value does not match an existing call.

 

 

 

 

 

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

 

 

subscribed only to channels 1 through 12.

 

 

 

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.

 

 

 

 

88

Incompatible destination

The requested call can not be accommodated because of protocol

differences or other incompatibilities, such as data rate.

 

 

 

 

 

96

Mandatory information element is missing

The call can not be completed because a mandatory information

element is missing.

 

 

 

 

 

97

Message type non-existent or not

The received message is not a recognized message type.

implemented

 

 

 

 

 

 

 

Message not compatible with call state, or

The message can not be received while in the call state.

98

message type non-existent or not

 

 

implemented

 

 

 

 

100

Invalid information element contents

Information received could not be processed because of incorrectly

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.

 

 

 

 

 

Page C-2

NDA-24233 Issue 2

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NEC NDA-24233 manual Appendix CVisuaLink 128/384 Engineering Guide