The Sinch Elastic SIP Trunking product hunts through endpoints in order of priority whenever the customer’s infrastructure rejects, or fails to respond to, a SIP Invite request.
4XX
By default, we will not hunt on 4XX errors except for the following codes:
| Code | Reason | Default behavior |
| 403 | Forbidden | Hunt |
| 404 | Not Found | Hunt |
| 408 | Request Timeout | Hunt |
| 415 | Unsupported Media Type | Hunt |
| 420 | Bad Extension | Hunt |
| 421 | Extension Required | Hunt |
| 422 | Session Interval Too Small | Hunt |
| 423 | Interval Too Brief | Hunt |
| 436 | Bad Identity Info | Hunt |
| 437 | Unsupported Certificate | Hunt |
| 438 | Invalid Identity Header | Hunt |
| 480 | Temporarily Unavailable | Hunt |
| 487 | Request Terminated | Hunt |
| 488 | Not Acceptable Here | Hunt |
| 491 | Request Pending | Hunt |
| 493 | Undecipherable | Hunt |
5XX
We will always continue hunting on a 5XX error:
| Code | Reason | Default behavior |
| 500 | Internal Server Error | Hunt |
| 503 | Service Unavailable | Hunt |
| 504 | Server Timeout | Hunt |
6XX
We will not continue hunting after receiving a 6XX error.
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