Call Tower experienced a critical incident on July 9, 2026 affecting Microsoft Teams - Direct Routing and Microsoft Operator Connect and 1 more component, lasting 4d 4h. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Jul 09, 2026, 09:57 AM UTC
CallTower has opened a master case to investigate this issue as it has been reported by more than one CallTower customer. This issue may or may not directly affect your services and is currently under investigation. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com approximately every 30 minutes, unless identified otherwise. This issue is being investigated as a top priority.
- investigating Jul 09, 2026, 10:28 AM UTC
Microsoft Teams and Zoom customers in EMEA are receiving failures when attempting outbound calls. Calltower's voice network engineers have been engaged and are working diligently to restore services in EMEA. CallTower has opened a master case to investigate this issue as it has been reported by more than one CallTower customer. This issue may or may not directly affect your services and is currently under investigation. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com approximately every 30 minutes, unless identified otherwise. This issue is being investigated as a top priority.
- identified Jul 09, 2026, 11:00 AM UTC
CallTower engineers are continuing their efforts to isolate and restore services in EMEA for all affected customers. CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com approximately every 30 minutes, unless identified otherwise
- identified Jul 09, 2026, 11:33 AM UTC
CallTower Network Engineers have identified a potential cause of the service disruption and are actively working to implement remediation measures. At this time, our engineers are focused on validating the identified cause and restoring full-service stability as quickly as possible. We are continuing to monitor the environment closely and are treating this issue as a top priority. CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com approximately every 30 minutes, unless identified otherwise
- monitoring Jul 09, 2026, 12:02 PM UTC
CallTower engineers have completed remediation efforts and service appears to be restored, based on current monitoring and testing. We ask that affected customers please retest their services and confirm that normal functionality has been restored. If you continue to experience any issues, please contact CallTower Support and provide details of the impact so that our teams can investigate further. CallTower has opened a master case for this issue as it is affecting more than one CallTower customer. This issue may or may not directly affect your services. If you are affected, please report the issue to [email protected]. CallTower intends to post updates on status.calltower.com as any new information becomes available.
- resolved Jul 13, 2026, 02:51 PM UTC
CallTower considers the issue resolved at this time. We will be closing this master case and all associated cases. Within three business days, an Official Root Cause Analysis (RCA) or a Preliminary RCA will be available and provided to customers upon request.