This page gives a short overview about the SIP response codes for errors. A detailed description of the SIP response code can be found in "RFC 3261 - SIP: Session Initiation Protocol".
SIP Response Codes, Class 4: Request error
| Code | Description |
|---|---|
| 400 | Bad Request |
| 401 | Unauthorized |
| 402 | Payment Required |
| 403 | Forbidden |
| 404 | Not Found |
| 405 | Method Not Allowed |
| 406 | Not Acceptable |
| 407 | Proxy Authentication Required |
| 408 | Request Timeout |
| 410 | Gone |
| 413 | Request Entity Too Large |
| 414 | Request-URI Too Long |
| 415 | Unsupported Media Type |
| 416 | Unsupported URI Scheme |
| 420 | Bad Extension |
| 421 | Extension Required |
| 423 | Interval Too Brief |
| 480 | Temporarily Unavailable |
| 481 | Call/Transaction Does Not Exist |
| 482 | Loop Detected |
| 483 | Too Many Hops |
| 484 | Address Incomplete |
| 485 | Ambiguous |
| 486 | Busy Here |
| 487 | Request Terminated |
| 488 | Not Acceptable Here |
| 491 | Request Pending |
| 493 | Undecipherable |
SIP response codes, class 5: server-error
| Code | Description |
|---|---|
| 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 |
SIP response codes, class 6: globale-error
| Code | Description |
|---|---|
| 600 | Busy Everywhere |
| 603 | Decline |
| 604 | Does Not Exist Anywhere |
| 606 | Not Acceptable |
Version 7.8