SIP 408 Timeout on APAC BYOC Failover

Stuck on recurring 408 Request Timeout errors when the primary carrier link drops. The failover logic in our Singapore region trunks seems to hang for 15 seconds before switching to the secondary provider, causing significant call setup delays.

We are using the standard outbound routing configuration with 15 active trunks. The SIP INVITE packets are dropping silently during the transition. Is this a known latency issue with the specific carrier integration or a misconfiguration in the trunk settings?

It depends, but generally… SIP timeouts often stem from rigid retry policies. In my load tests, adjusting the failover timeout helps. Try setting a lower initial timeout in the trunk config:

{
 "failover_timeout_ms": 5000,
 "retry_attempts": 2
}

This reduces the 15-second hang.