Hello,
Regarding to this implementation, I'm sending SIP Subscribe message from uac_req_send function to CNAM server but it is unavailable and Kamailio doesn't receive any reply from CNAM server, What I'm noticing is that kamailio is retransmitting the SIP Subscribe msg until get "408 request time out".
In order to implement a failure_route to this SIP Subscribe msg sent from uac_req_send I put kamailio send this SIP msg first to itself then kamailio set the failure_route and send SIP Subscribe msg to CNAM server using t_relay from script configuration file, but kamailio still not entering on failure_route block.
How can I set failure_route to this SIP Subscribe msg sent from uac_req_send()?