Data Action Timeout on BYOC Trunk Registration Event Sync via AWS Lambda

Stuck on a problem and need help troubleshooting a persistent timeout issue when attempting to sync BYOC trunk registration events to our internal data warehouse via an AWS Lambda Data Action.

We are currently managing 15 BYOC trunks across APAC and EMEA regions, all configured with strict SIP registration monitoring. The goal is to trigger a Data Action whenever a trunk registration status changes from ‘Registered’ to ‘Unregistered’ to alert our NOC team immediately. We have set up an Architect flow that listens for the ‘Trunk Registration Status Change’ event. This flow then invokes a custom Data Action configured to call an AWS Lambda endpoint.

The issue arises specifically when the event volume spikes during our scheduled carrier failover tests. While individual events process correctly in isolation, batched events or rapid successive failures cause the Data Action to return a 504 Gateway Timeout. The Genesys Cloud logs indicate that the request to the Lambda endpoint exceeded the 10-second timeout threshold set for the Data Action. Interestingly, the Lambda function itself completes in under 200ms, as confirmed by CloudWatch metrics, suggesting the bottleneck lies within the Genesys Cloud outbound connection handling or the initial TCP handshake rather than the processing logic.

We have verified that the outbound IP ranges for our Genesys Cloud org are correctly allow-listed on our AWS API Gateway. The Lambda function uses the standard Node.js 18 runtime. The Data Action is configured with basic authentication and uses HTTPS. We have also increased the Lambda’s memory allocation to 512MB to rule out cold start delays, though this did not resolve the 504 errors during high-load scenarios.

Has anyone else encountered similar latency issues with external Data Actions triggered by trunk-level events? Are there specific keep-alive settings or connection pooling configurations within Genesys Cloud that might be affecting the outbound HTTP request stability during high-throughput periods?

Have you verified that the Data Action configuration explicitly allows for asynchronous response handling? The default timeout logic in Genesys Cloud Architect is quite rigid, often interpreting a 5-second window as a hard limit for synchronous completion. If the AWS Lambda function requires additional time to process the BYOC trunk registration event before returning a status, the platform will log a timeout error regardless of the eventual success.

Consider adjusting the Data Action settings to treat HTTP 202 Accepted as a successful response. This approach decouples the immediate flow execution from the backend processing time. In the Data Action configuration, ensure the “Success Status Codes” field includes both 200 and 202. This prevents the flow from halting while the Lambda function completes its internal logic.

Additionally, review the payload size being sent to the Lambda endpoint. Large JSON structures containing detailed SIP trunk metadata can introduce network latency, especially across the APAC and EMEA regions. Reducing the payload to essential fields-such as trunk ID, timestamp, and status change-can significantly lower transmission time.

Monitoring the Conversation Detail view for these specific flows can also provide insight into where the delay occurs. If the timeout persists after adjusting the status codes, check for any rate-limiting issues on the AWS side. The platform’s retry logic might be triggering additional requests, exacerbating the bottleneck. Aligning the Data Action’s timeout threshold with the Lambda’s execution time is critical for maintaining reliable event synchronization.