SIP codes
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| Code | Definition |
| 100 | Trying |
| 180 | Ringing |
| 181 | Call is being forwarded |
| 182 | Queued |
| 183 | Session in progress |
| 200 | OK |
| 202 | Accepted: Used for referrals |
| 300 | Multiple choices |
| 301 | Moved permanently |
| 302 | Moved temporarily |
| 305 | Use proxy |
| 380 | Alternate service |
| 400 | Bad request |
| 401 | Unauthorized: Used only by registrars. Proxies should use Proxy authorization 407. |
| 402 | Payment required (reserved for future use) |
| 403 | Forbidden |
| 404 | Not found (User not found) |
| 405 | Method not allowed |
| 406 | Not acceptable |
| 407 | Proxy authentication required |
| 408 | Request timeout (could not find the user in time) |
| 410 | Gone (the user existed once, but is not available here any more) |
| 413 | Request entity too large |
| 414 | Request-URI too long |
| 415 | Unsupported media type |
| 416 | Unsupported URI scheme |
| 420 | Bad extension (Bad SIP protocol extension used. Not understood by the server.) |
| 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 (could not decrypt S/MIME body part) |
| 500 | Server internal error |
| 501 | Not implemented (The SIP request method is not implementedhere.) |
| 502 | Bad gateway |
| 503 | Service unavailable |
| 504 | Server timeout |
| 505 | Version not supported (The server does not support this version of the SIP protocol.) |
| 513 | Message too large |
| 600 | Busy everywhere |
| 603 | Decline |
| 604 | Does not exist anywhere |
| 606 | Not acceptable |
