Stuck on a persistent issue where SIP trunk registrations drop intermittently, causing 408 Request Timeout errors in specific Architect flows. The bulk export jobs for these calls fail because the recording metadata is incomplete. We are using Genesys Cloud v2.3.1 with custom S3 buckets. The SIP trunk is configured with standard TLS settings, but the timeouts correlate with peak traffic hours. Any insights on isolating network congestion from flow execution delays would be appreciated.
Thanks for the help.
The root of the issue is likely related to how the SIP signaling is handled under high concurrency, which mirrors the 429 issues seen in WFM APIs. When the JMeter load increases, the WebSocket connections for real-time events can drop, leading to the 1006 errors that cause the Architect flows to timeout with 408s.
To isolate this, check the sip_trunk_registration_status in the load test metrics. If the registration drops coincide with the JMeter ramp-up, the issue is connection limit exhaustion.
<!-- JMeter HTTP Request Defaults Configuration -->
<elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables">
<collectionProp name="Arguments.arguments">
<elementProp name="Keep-Alive" elementType="HTTPArgument">
<boolProp name="HTTPArgument.always_encode">false</boolProp>
<stringProp name="HTTPArgument.name">Connection</stringProp>
<stringProp name="HTTPArgument.value">keep-alive</stringProp>
</elementProp>
</collectionProp>
</elementProp>
Ensure the JMeter HTTP Request Defaults include Connection: keep-alive to reduce the overhead of establishing new TCP connections for each SIP INVITE. The default TLS settings in Genesys Cloud v2.3.1 are standard, but the throughput limits for SIP trunks are lower than REST APIs.
If the 408 errors persist, reduce the JMeter thread group concurrency by 50% and observe the SIP registration stability. The bulk export job failures are a secondary effect of the missing recording metadata due to the dropped calls. Focus on stabilizing the SIP registration first. The documentation suggests that exceeding the WebSocket connection limits causes these intermittent drops. Implement exponential backoff in the JMeter script to handle the 409 Conflict errors if they appear during the load test. This approach usually resolves the timeout issues in Architect flows.
This is a classic throughput bottleneck. When concurrent call volumes spike, the SIP signaling layer struggles with registration refreshes. Check the WebSocket connection limits in your load test config. The API docs mention specific rate caps here: https://developer.genesys.cloud/api-docs/voice/sip-trunks. Try reducing the JMeter ramp rate to see if the 408s persist.
This is typically caused by the SIP registration refresh mechanism failing to complete within the carrier’s expected window during peak traffic, which directly triggers the 408 timeouts in your Architect flows. When managing multiple BYOC trunks, especially across APAC regions, the standard TLS handshake can be delayed by network jitter, causing the SIP UA to drop the registration before the next refresh packet is sent. The suggestion above about checking WebSocket limits is valid for digital channels, but for voice trunks, you need to look at the SIP keepalive interval and the carrier’s registration timeout settings. A common fix is to adjust the sip_trunk_registration_expires parameter in your trunk configuration to a lower value, such as 300 seconds, to ensure more frequent and smaller refresh packets that are less likely to be dropped by intermediate firewalls. Additionally, verify that your carrier’s SIP proxy supports the Contact header updates correctly, as some providers require specific formatting for the Expires field. If the issue persists, implement a custom failover rule in your outbound routing that triggers a re-registration attempt after three consecutive 408 errors, rather than waiting for the full timeout cycle. This reduces the impact on your bulk export jobs by allowing the flow to retry the recording metadata upload once the trunk registration is re-established. You can monitor the sip_trunk_failover_events in the telephony_metrics dashboard to confirm if the re-registration attempts are successful. Ensure your S3 bucket permissions allow for asynchronous writes, as incomplete metadata uploads can also contribute to the perceived timeout, even if the SIP connection is stable.