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Outage in CallTower

EMEA outbound calls failing

Resolved Major
July 09, 2026 - Started 8 days ago - Lasted 4 days
Official incident page

Incident Report

Summary AI Generated

**EMEA Outbound Calls Failing – CallTower (Microsoft Teams Direct Routing)** Outbound calls failed for CallTower customers in the EMEA region using Microsoft Teams Direct Routing (and Zoom), lasting approximately 101 hours. CallTower engineers identified the root cause and completed remediation, restoring service by July 9, 2026. The incident was fully resolved on July 13, 2026, with a Root Cause Analysis available to customers upon request within three business days.

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 support@calltower.com. 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.

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Latest Updates ( sorted recent to last )
RESOLVED 4 days ago - at 07/13/2026 02:51PM

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.

MONITORING 8 days ago - at 07/09/2026 12:02PM

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 support@calltower.com. CallTower intends to post updates on status.calltower.com as any new information becomes available.

IDENTIFIED 8 days ago - at 07/09/2026 11:33AM

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 support@calltower.com. CallTower intends to post updates on status.calltower.com approximately every 30 minutes, unless identified otherwise

IDENTIFIED 8 days ago - at 07/09/2026 11:00AM

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 support@calltower.com. CallTower intends to post updates on status.calltower.com approximately every 30 minutes, unless identified otherwise

INVESTIGATING 8 days ago - at 07/09/2026 10:28AM

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 support@calltower.com. 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 8 days ago - at 07/09/2026 09:57AM

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 support@calltower.com. 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.

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