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380
Alternative Service
4xx—Client Failure Responses
400
Bad Request
401
Unauthorized
402
Payment Required
403
Forbidden
404
Not Found (User not found)
405
Method Not Allowed
406
Not Acceptable
407
Proxy Authentication Required
408
Request Timeout
409
Conflict
410
Gone
412
Conditional Request Failed
413
Request Entity Too Large
414
Request-URI Too Long
415
Unsupported Media Type
416
Unsupported URI Scheme
417
Unknown Resource-Priority
420
Bad Extension
421
Extension Required
422
Session Interval Too Small
Appendix B: SIP Overview
486
Busy Here
487
Request Terminated
488
Not Acceptable Here
489
Bad Event
491
Request Pending
493
Undecipherable
494
Security Agreement Required
5xx—Server Failure Responses
500
Server Internal Error
501
Not Implemented
502
Bad Gateway
503
Service Unavailable
504
Server Time-out
505
Version Not Supported
513
Message Too Large
580
Precondition Failure
6xx—Global Failure Responses
600
Busy Everywhere
603
Decline
604
Does Not Exist Anywhere
606
Not Acceptable
525
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