SIP Response Messages

Informational

100 Trying |(A 100 Trying response typically does not contain a To tag.)
180 Ringing
181 Call Is Being Forwarded
182 Call Queued
183 Session Progress

Success

200 OK ( |Message body: OPTIONS REGISTER) (No Message body: CANCEL, INFO, MESSAGE, SUBSCRIBE, NOTIFY, PRACK)
202 Accepted

Redirection

300 Multiple |Choices With the choise in the Contact header field
301 Moved Permantly
302 Moved Temporarily
305 Use Proxy
380 Alternative Service

Client Error

400 Bad request | Missing required header field
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 | Removed from RFC 3261 but defined in RFC 2543
410 Gone
411 Length Required
413 Request Entity Too Large
414 Request-URI Too Long
415 Unsupported Media Type
416 Unsupported URI Scheme | New in RFC 3261
420 Bad Extension
421 Extension Required
422 Session Timer Interval Too Small
423 Interval Too Brief
428 Use Authentication Token
429 Provide Referror Identity
480 Temporarily Unavailable
482 Loop Detected | Checked by parameters branch of Via header field.
483 Too Many Hops
484 Address Incomplete
485 Ambiquous | Same as 300 Multiple Choices but know the the caller needs to choice.
486 Busy Here
487 Request Terminated
488 Not Acceptable Here
489 Bad Event
491 Request Pendng
493 Request Undecipherable

Server Error

500 Server Internal Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Gateway Timeout
505 Version Not Supported
513 Message Too Large

Global Error

600 Busy Everywhere
603 Decline
603 Does Not Exist Anywhere
606 Not Acceptable