ISDN Release
Description
Reason
Message type non-existent or not
97
implemented
Message not compatible with call state or
98
message type non-existent or not
implemented
Information element non-existent or not
99
implemented
100
Invalid information elements contents
101
Message not compatible with call state
102
Recovery of timer expiry
111
Protocol error
127
Interworking unspecified
Fixed Mapping of SIP Response to ISDN Release Reason
Table 98
describes the mapping of SIP response to ISDN release reason.
Mapping of SIP Response to ISDN Release Reason
Table 98
SIP Response
Description
*
Bad request
400
401
Unauthorized
402
Payment required
403
Forbidden
404
Not found
405
Method not allowed
406
Not acceptable
407
Proxy authentication required
408
Request timeout
409
Conflict
*
Messages and responses were created since the 'ISUP to SIP Mapping' draft doesn't specify
their cause code mapping.
V7122 Gateway User Guide
SIP
Response
480*
409*
480*
501*
503*
408
500
500
ISDN Release
Description
Reason
31
Normal, unspecified
21
Call rejected
21
Call rejected
21
Call rejected
1
Unallocated number
63
Service/option unavailable
Service/option not
79
implemented
21
Call rejected
102
Recovery on timer expiry
41
Temporary failure
Description
Temporarily not
available
Conflict
Not found
Not implemented
Service unavailable
Request timeout
Server internal error
Server internal error
457
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