Version 6.4 245 March 2012
SIP User's Manual 18. GW and IP to IP
ISDN Release
Reason
Description
SIP
Response
Description
111 Protocol error 500 Server internal error
127 Interworking unspecified 500 Server internal error
* Messages and responses were created because the ‘ISUP to SIP Mapping’ draft doesn’t
specify their cause code mapping.
18.1.6.1.3 Fixed Mapping of SIP Response to ISDN Release Reason
The following table describes the mapping of SIP response to ISDN release reason.
Table 18-3: 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 127 Interworking
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
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