SIP 408 Timeout on BYOC Failover in AP-SE-2

Looking for advice on handling SIP 408 Request Timeout errors when forcing failover across our 15 BYOC trunks in the AP-SE-2 region. The primary carrier drops the INVITE after 3 seconds, causing Genesys Cloud to reject the outbound routing rule.

408 Request Timeout: SIP/2.0 408 Request Timeout

Is this a known latency issue with the regional edge or a carrier configuration gap?