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.

We are seeing phone system issues, which began at around 8:35 am this morning. We are seeing that services are restoring now 8:46am, and we are still chasing an update from our upstream carrier as to the cause of the outage.