Date / time of Incident - 04/12/2020 1:23 PM AEST

Date / time of Restoration - 04/12/2020 1:54 PM AEST

Duration of Incident - 31 minutes

Impact:

‌A subset of Aatrox Communications SIP trunking services experienced intermittent registration and call drops.

Root Cause and Resolution:

This Incident was caused by malicious SIP traffic hitting one of our public-facing SBCs, this then triggered the SBC to throttle bandwidth in processing the SIP signalling as part of our DDoS prevention mechanism.

A temporary fix was to block the offending IPs as well as tweaking some realm protection settings to alleviate the flow-on impact to customers.

Actions to mitigate recurrence:

An investigation of the issue indicates that the standard DDoS protections are working as expected. However, an investigation is ongoing to mitigate a specific configuration change. This is currently under review and close to implementation. This should help to resolve the issues seen during the outage.