A continuación se muestran los errores que se pueden producir en los mensajes SIP de manera más detallada explicando la causa concreta del error:
Como se ha indicado anteriormente corresponde con las respuestas de la clase:
4xx - Respuestas de fallo de método.
5xx - Respuestas de fallos de servidor.
6xx - Respuestas de fallos globales.
Estos errores se corresponden con los mensajes de error Q.931 o DSS1 y suponen el mapeo de los eventos SIP con lós códigos de error de la RTC (Red telefónica conmutada)
| Evento SIP | Valor decimal (DSS1) | Valor hexadecimal (DSS1) | Valor transmitido en el canal D | Detalle |
|---|---|---|---|---|
| 400 Bad request | 127 | 7f | ff | Interworking, unspecified |
| 401 Unauthorized | 57 | 39 | b9 | Bearer capability not authorized |
| 402 Payment required | 21 | 15 | 95 | Call rejected |
| 403 Forbidden | 57 | 39 | b9 | Bearer capability not authorized |
| 404 Not found | 1 | 01 | 81 | Unallocated (unassigned) number |
| 405 Method not allowed | 127 | 7f | ff | Interworking, unspecified |
| 406 Not acceptable | 127 | 7f | ff | Interworking, unspecified |
| 407 Proxy authentication required | 21 | 15 | 95 | Call rejected |
| 408 Request timeout | 102 | 66 | e6 | Recover on Expires timeout |
| 409 Conflict | 41 | 29 | a9 | Temporary failure |
| 410 Gone | 1 | 01 | 81 | Unallocated (unassigned) number |
| 411 Length required | 127 | 7f | ff | Interworking, unspecified |
| 413 Request entity too long | 127 | 7f | ff | Interworking, unspecified |
| 414 Request URI (URL) too long | 127 | 7f | ff | Interworking, unspecified |
| 415 Unsupported media type | 79 | 4f | cf | Service or option not available |
| 420 Bad extension | 127 | 7f | ff | Interworking, unspecified |
| 480 Temporarily unavailable | 18 | 12 | 92 | No user response |
| 481 Call leg does not exist | 127 | 7f | ff | Interworking, unspecified |
| 482 Loop detected | 127 | 7f | ff | Interworking, unspecified |
| 483 Too many hops | 127 | 7f | ff | Interworking, unspecified |
| 484 Address incomplete | 28 | 1c | 9c | Address incomplete (invalid number format) |
| 485 Address ambiguous | 1 | 01 | 81 | Unallocated (unassigned) number |
| 486 Busy here | 17 | 11 | 91 | User busy |
| 487 Request cancelled | 127 | 7f | ff | Interworking, unspecified |
| 488 Not acceptable here | 127 | 7f | ff | Interworking, unspecified |
| 500 Internal server error | 41 | 29 | a9 | Temporary failure |
| 501 Not implemented | 79 | 4f | cf | Service or option not implemented |
| 502 Bad gateway | 38 | 26 | a6 | Network out of order |
| 503 Service unavailable | 63 | 3f | bf | Service or option unavailable |
| 504 Gateway timeout | 102 | 66 | e6 | Recover on Expires timeout |
| 505 Version not implemented | 127 | 7f | ff | Interworking, unspecified |
| 580 Precondition Failed | 47 | 2f | af | Resource unavailable, unspecified |
| 600 Busy everywhere | 17 | 11 | 91 | User busy |
| 603 Decline | 21 | 15 | 95 | Call rejected |
| 604 Does not exist anywhere | 1 | 01 | 81 | Unallocated (unassigned) number |
| 606 Not acceptable | 58 | 3a | ba | Bearer capability not presently available |
Fuente: Forovoip.com
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