Seeing intermittent SIP 503 Service Unavailable errors specifically when agents execute shift swaps during peak hours. The issue appears localized to the US2 region and correlates with the WFM schedule publish window.
When an agent swaps a shift via the self-service portal, the associated routing configuration updates almost immediately. However, calls routed to the newly assigned group are failing with 503s from the SIP trunk provider. The Genesys Cloud SIP trunk status shows “Connected,” but the call flow logs indicate a timeout waiting for an available agent in the updated group.
Has anyone encountered latency between the WFM schedule publish and the SIP trunk routing table sync? The delay seems to be roughly 2-3 minutes, which is unacceptable for high-volume contact centers. Checking the Architect flow, the routing strategy is set to “Longest Idle Agent” within the updated group.
Environment details:
- Region: US2
- WFM Version: Current (Scheduling API v2)
- SIP Trunk Provider: Twilio
- Agent Count: 150 active agents
Looking for best practices to handle this sync delay. Should we implement a fallback routing strategy during the publish window, or is there a way to force an immediate routing table refresh via API? Any insights would be appreciated.