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After a root cause analysis, we discovered the issue was with our upstream provider. The upstream provider suffered a router failure in their datacentre, and connections were lost for 1 minute while the redundant router accepted connections. Following the reconnection, SIP registrations took 4-7 minutes to re-negotiate and re-connect.

Thanks for your patience and understanding.

Outage Postmortem Report

Incident Overview:
Today, our data center faced an unexpected issue when several upstream transit carriers failed simultaneously. As a result, there was a service disruption making the data center inaccessible from 7:32 AM to 7:47 AM, totaling approximately 15 minutes of downtime.

Root Cause:
Although our network design includes multiple redundant carriers to prevent such incidents, the simultaneous failure of these carriers led to this unusual outage. Prelimi...