| Response | Generate | Receive | Comments |
|---|
1xx - Information | | |
|
100 Trying | Yes | Yes |
|
180 Ringing | Yes | Yes |
|
181 Call is being forwarded | No | Yes | Handled as a Provisional Response |
182 Queued | No | Yes | Handled as a Provisional Response |
183 Session Progress | Yes | Yes |
|
2xx - Successful | | |
|
200 OK | Yes | Yes |
|
202 Accepted | Yes | Yes | RFC 3265 (Generated ONLY when the SBC accepts an inbound REFER request) |
3xx - Redirection | | |
|
300 Multiple choices | No | Yes | All 3xx responses are handled identically. The SBC will try to send a new INVITE to the Contact URI in the 3xx response. |
301 Moved permanently | No | Yes |
|
302 Moved temporarily | No | Yes |
|
305 Use proxy | No | Yes |
|
380 Alternative service | No | Yes |
|
4xx - Request Failure | | |
|
400 Bad Request | Yes | Yes |
|
401 Unauthorized | Yes | Yes |
|
402 Payment required | Yes | Yes |
|
403 Forbidden | Yes | Yes |
|
404 Not Found | Yes | Yes |
|
405 Method Not Allowed | Yes | Yes |
|
406 Not Acceptable | Yes | Yes |
|
407 Proxy authentication required | No | Yes |
|
408 Request timeout | Yes | Yes |
|
409 Conflict | No | Yes |
|
410 Gone | Yes | Yes | Generated only in SIP-ISDN call scenario |
411 Length required | No | No |
|
413 Request entity too large | Yes | Yes | Generated only in SIP-ISDN call scenario |
414 Request-URI too long | Yes | Yes |
|
415 Unsupported media | Yes | Yes |
|
416 Unsupported URI Scheme | Yes | Yes | Generated only in SIP-ISDN call scenario |
420 Bad extension | Yes | Yes |
|
421 Extension Required | Yes | Yes | Generated only in SIP-ISDN call scenario |
422 Session Timer Too Small | Yes | Yes |
|
423 Interval Too Brief | Yes | Yes |
|
480 Temporarily unavailable | Yes | Yes |
|
481 Call leg/transaction does not exist | Yes | Yes |
|
482 Loop detected | Yes | Yes | Generated ONLY in the scenario that an error Routing error occurs on ISDN side (cause code 0x19) |
483 Too many hops | Yes | Yes |
|
484 Address incomplete | Yes | Yes | Generated only in SIP-ISDN call scenario |
485 Ambiguous | Yes | Yes | Generated only in SIP-ISDN call scenario |
486 Busy here | Yes | Yes |
|
487 Request cancelled | Yes | Yes |
|
488 Not Acceptable Media | Yes | Yes |
|
489 Bad Event | Yes | Yes | RFC 3265 |
491 Request Pending | Yes | Yes |
|
493 Undecipherable | No | Yes |
|
494 Security Agreement Required | No | Yes | RFC 3329 |
5xx - Server Failure | | |
|
500 Server internal error | Yes | Yes |
|
501 Not implemented | Yes | Yes |
|
502 Bad gateway | Yes | Yes | Generated only in SIP-ISDN call scenario. |
503 Service unavailable | Yes | Yes |
|
504 Gateway timeout | Yes | Yes | Generated only in SIP-ISDN call scenario. |
505 Version not supported | Yes | Yes |
|
513 Message Too Large | Yes | Yes |
|
580 Precondition failed | No | Yes | RFC 3312 |
6xx - Global Responses | | |
|
600 Busy everywhere | Yes | Yes | Generated only in SIP-ISDN call scenario |
603 Decline | Yes | Yes | Generated only in SIP-ISDN call scenario |
604 Does not exist anywhere | Yes | Yes | Generated only in SIP-ISDN call scenario |
606 Not acceptable | No | Yes |
|