28/04/2022 03:20:00 PM (BST)
Issue Reported : 28/04/2022 02:15:00 PM
Microsoft Reference : TM365276
NHSmail Reference : INC28668185
Issue Status : RESTORED
Issue Description : Some users may be unable to make or receive PSTN calls using Microsoft Teams
Scope of impact : Impact was specific to users served through the affected components.
Final Update : 28/04/2022 03:45:00 PM – Microsoft are identified that an automatic script was activated after a failed service deployment per standard procedure. However, the script contained an underlying bug which routed PSTN traffic to components not configured to handle service requests. They have reconfigured the service to route requests to functionally operational infrastructure to remediate impact. They have confirmed the issue is resolved after monitoring the environment and receiving confirmation from previously impacted users that the issue is no longer occurring.
Root cause: A script contained a bug which routed PSTN requests to components which were not configured to process the requests.
Next steps : Microsoft are reviewing the script to identify the source of the bug to prevent this issue happening again.