So a couple hours ago, a server of ours, with about 160 nodes stopped being able to receive calls. This server is virtualized, and has been for a few years, with no related problems.
When calling a DID on the server, the server would answer that the number was no longer available. When I looked at the CDR, the calls showed, but the DID column was blank, as if the Inbound Route didn’t exist or something.
One of the CDR lines says “Congestion” under the App column, with “Application: Congestion(5)” when you hold your mouse over it, and “s [from-sip-external]” in the Destination column. A call a minute or two later was different, but still didn’t go through. It said “Playback” under App and “Playback:ss(no-service)” when you hold your mouse over it.
In a panic, I reset the server. It came up fairly quickly, and the problem resided.
So I come to the community to ask if anyone has experienced anything similar, or if I can get some advice that will help us avoid this in the future.