4 Mapping ITU SS7 Cause Codes to SIP Responses (continued)
124 Chapter 5
TABLE 5.5 Mapping ANSI SS7 Cause Codes to SIP Responses
SS7 Cause Code SIP Response
23 Unallocated number 404 Not Found
25 Exchange routing error 500 Server Internal Error
26 Misrouted call to a ported number 404 Not Found
45 Preemption 500 Server Internal Error
46 Precedence 500 Server Internal Error
51 Call type incompatible with service request 500 Server Internal Error
54 Call blocked due to group restrictions 500 Server Internal Error
SIP Response SS7 Cause Code
400 Bad Request 127 Interworking
401 Unauthorized 127 Interworking
402 Payment Required 127 Interworking
403 Forbidden 127 Interworking
404 Not Found 1 Unallocated number
405 Method Not Allowed 127 Interworking
406 Not Acceptable 127 Interworking
407 Proxy Authentication Required 127 Interworking
408 Request Timeout 127 Interworking
410 Gone 22 Number changed
413 Request Entity Too Long 127 Interworking
414 Request-URI Too Long 127 Interworking
415 Unsupported Media Type 127 Interworking
416 Unsupported URI Scheme 127 Interworking
420 Bad Extension 127 Interworking
421 Extension Required 127 Interworking
423 Interval Too Brief 127 Interworking
480 Temporarily Unavailable 20 Subscriber absent
481 Call/Transaction Does Not Exist 127 Interworking
482 Loop Detected 127 Interworking
483 Too Many Hops 127 Interworking
484 Address Incomplete 28 Invalid number format
485 Ambiguous 127 Interworking
486 Busy Here 17 User Busy
TABLE 5.
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