One of our upstream carriers have call issues. We've routed calls away from them as much as possible, but this may still affect some inbound calls. The symptom is unexpected call rejections or audio issues. They're aware and are working to fix it as soon as possible.
Our upstream carrier reports this problem has been resolved.
One of our upstream carriers reported: at 11:04 hrs BST the call handling units in one of our nodes started to behave unexpectedly, causing some audio issues and call failures. We are investigating some unusual traffic received at that time. The units were restarted starting at 11:22 hrs BST at which point traffic quickly restored to normal. The remaining units were fully restarted by 11:44 hrs BST when we were back at full redundancy.