OPENSIPS 477 send failed not Entering into Failure Root

Failure Route is not executed on a 477 or IP-Blocked error.

- t_on_failure is set
- failure_route is existing
- t_relay is always positive in an if-construct
- you may catch the 477 error inscript but not as a failure route
- Status code is always send

We expected the same behaviour as on a 408 error.

Actually this case is supposed to work a bit different when you think. By design (on logical reasons), the failure route is triggered only when there is a SIP failure (transaction failed with negative reply).

In your case, you have a different case of failure - you were actually not able to send the INVITE out, so it is a transport error. So failure route is not supposed to be triggered.

What to do here is to use the "0x02" flag with t_relay() - seehttp://www.opensips.org/html/docs/modules/1.9.x/tm.html#id293413 - this will make t_relay() to return failure to script instead of sending the 477 out -> at script level you can handle the failure.