Two cabinet OS7200 V4.98. 20 SIP Trunks behind a Fortigate 100 firewall. Internet went down this morning around 5:30am. Internet came back up at 7:30am. The IT director had to restart the Fortigate so that all data services would come back up. The SIP services would not re-register after the firewall restart. The alarm log said-ISP1 NOK REG TO

I had to restart the phone system for the SIP to re-register. Any ideas? We are authorizing using log in phone number ID and password.

Will the phone system need to be restarted every time the internet goes down?

MikeS In VA.