This article explains what to do when you cannot receive or make outbound calls and the firewall connected to your dedicated fibreoptic has lost its connection to Volt Delta. This might show up as "connection lost" in your firewall logs.
Please create a support ticket (if you have not already done so) and provide the IP address of your disconnected firewall if available. The support team will get back to you as soon as they are able to get any information or solution.
Previously a similar issue with these symptoms occurred and was caused by a break in the fibreoptic cable.
When the client creates a support ticket, ask them to provide IP addresses of any firewalls that have lost their connection (if they have not already provided them) and escalate the issue to the BU as per SRT.