[SR-Users] 401 responses ending up in onreply_route instead of failure_route

[Daniel Tryba]

Situation:
endpoint -> kamailio (4.1.0) -> upstream sip server (kamailio 4.0.x)

For an outbound call endpoint authenticates with kamailio. Kamailio relays the 
invite to upstream and upstream responds with a 401. 

This 401 should trigger authentication. So I thought I could use uac_auth() to 
fix this. uac_rely may only be used from FAILURE_ROUTE. So the initial INVITE 
from the endpoint has this set:

        if (is_method("INVITE")) {
                if(!t_is_set("failure_route")) t_on_failure("MANAGE_FAILURE");
        }

But to my suprise the 401 doesn't end up in the failure_route but in the 
onreply_route. Why? What am I missing?

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