S3 upload failure on BYOC edge for legal hold exports

Does anyone know why bulk export jobs fail when routing through a BYOC edge in Europe? The S3 integration works fine for standard regions, but digital channel recordings trigger a 503 Service Unavailable. The metadata indicates a chain of custody break.

Error: 503 Service Unavailable - Edge node timeout during TLS handshake

We are using the Recording API v1. Is there a specific certificate requirement for BYOC nodes handling legal holds?

This looks like a connectivity issue rather than a certificate error. The 503 indicates the edge node cannot establish the outbound connection to the S3 endpoint in time.

Cause:
The BYOC edge likely lacks the necessary outbound firewall rules or DNS resolution for the specific S3 regional endpoint. Legal hold exports often require higher throughput and stricter chain-of-custody validation, which increases handshake duration. If the edge is in EU1 but the S3 bucket is in us-east-1, the latency alone can trigger the TLS timeout. Additionally, the Recording API v1 is deprecated for bulk operations.

Solution:
Verify the edge’s outbound connectivity to the S3 endpoint. Ensure ports 443 are open and that the edge can resolve the S3 hostname. Check the edge logs for DNS failures.

Also, switch to the newer Reporting API for bulk exports. It handles asynchronous processing better.

POST /api/v2/analytics/reporting/bulk
{
 "queries": [
 {
 "interval": "2023-10-01T00:00:00.000Z/2023-10-02T00:00:00.000Z",
 "view": "recording",
 "groupBy": ["interactionId"],
 "selection": ["recordingUrl", "metadata"]
 }
 ]
}

This approach avoids the synchronous timeout issues of the old API. The bulk endpoint returns a job ID immediately. You can then poll for status. This separates the export logic from the real-time conversation flow. It also provides better audit trails for legal holds.

Check the Performance dashboard for “Edge Outbound Latency”. If this metric spikes during export attempts, the network path is the bottleneck. Consider moving the S3 bucket to the same region as the edge to reduce latency. This is a common fix for BYOC environments in Europe.

To fix this easily, this is to verify the edge’s outbound ACL permits traffic to the specific S3 regional endpoint, not just the generic AWS range.