SIP/501 Call-Failed: Unable to reach destination
Background
The organization is currently managing a BYOC setup within the EU-West region. The primary objective is to ensure stable SIP trunk registration for incoming voice traffic. Recent updates to the Architect flow logic have not impacted telephony configuration, yet the Performance Dashboard indicates a spike in abandoned calls correlated with registration timeouts.
Issue
SIP trunks are failing to register consistently against the Genesys Cloud SIP endpoints. The error manifests as a 501 Call-Failed status when attempting to bridge calls from the PSTN to the internal queue. This occurs despite the SIP trunk configuration matching the documented best practices for EU-West. The business impact is a measurable decrease in service level adherence during peak hours.
Troubleshooting
- Verified SIP trunk credentials and IP allow-listing in the Genesys Cloud administration console.
- Confirmed that the Architect flow routing for voice calls is correctly mapped to the affected queue.
- Checked real-time queue activity; agents are available, but calls drop before ringback.
- Reviewed network latency reports; no significant jitter detected from the BYOC provider.
Could someone clarify if there are specific SIP header requirements or timeout thresholds in the EU-West region that differ from the standard documentation? The current configuration appears correct based on the provided guides.