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Mediant 2000 SIP User’s Manual I. Release Reason Mapping
Version 4.4 229 July 2005
Table I-2: Mapping of SIP Response to ISDN Release Reason
SIP
Response
Description
ISDN Release
Reason
Description
400
*
Bad request
31
Normal, unspecified
401
Unauthorized
21
Call rejected
402
Payment required
21
Call rejected
403
Forbidden
21
Call rejected
404
Not found
1
Unallocated number
405
Method not allowed
63
Service/option unavailable
406
Not acceptable
79
Service/option not implemented
407
Proxy authentication required
21
Call rejected
408
Request timeout
102
Recovery on timer expiry
409
Conflict
41
Temporary failure
410
Gone
22
Number changed w/o diagnostic
411
Length required
127
Interworking
413
Request entity too long
127
Interworking
414
Request URI too long
127
Interworking
415
Unsupported media type
79
Service/option not implemented
420
Bad extension
127
Interworking
480
Temporarily unavailable
18
No user responding
481*
Call leg/transaction doesn’t exist
127
Interworking
482*
Loop detected
127
Interworking
483
Too many hops
25
Exchange – routing error
484
Address incomplete
28
Invalid number format
485
Ambiguous
1
Unallocated number
486
Busy here
17
User busy
488
Not acceptable here
31
Normal, unspecified
500
Server internal error
41
Temporary failure
501
Not implemented
38
Network out of order
502
Bad gateway
38
Network out of order
503
Service unavailable
41
Temporary failure
504
Server timeout
102
Recovery on timer expiry
505*
Version not supported
127
Interworking
600
Busy everywhere
17
User busy
603
Decline
21
Call rejected
604
Does not exist anywhere
1
Unallocated number
606*
Not acceptable
38
Network out of order
*
Messages and responses were created since the ‘ISUP to SIP Mapping’ draft doesn’t specify their cause
code mapping.