Monitoring - 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.
Jul 09, 2026 - 06:02 MDT
Update - 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
Jul 09, 2026 - 05:33 MDT
Identified - 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
Jul 09, 2026 - 05:00 MDT
Update - 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.
Jul 09, 2026 - 04:28 MDT
Investigating - 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.
Jul 09, 2026 - 03:57 MDT
PSTN / Global SIP (Sansay Infrastructure): - Moving Sansay’s from old HK2 Rack to new HK2 Rack.
***Possible Impact: Active calls on the Hong Kong Sansay will be terminated when the maintenance begins. For any customers with functional redundancy from the Hong Kong Sansay to another CallTower datacenter will be able to make and receive new calls via the redundant datacenter during the maintenance window.
***Possible Impact: Sansay customer calls may intermittently drop while updates are being performed and traffic is rerouted.
Outage: No
Cisco: - Security Update Expressway Clusters for CUCM
***Possible Impact: *Cisco Jabber/ MRA Phones, Users will experience a connectivity loss with their Jabber Client/Services and/or MRA Edge connection Phones.
Completed -
The scheduled maintenance has been completed.
Jul 7, 17:10 MDT
Scheduled -
As part of our ongoing efforts to protect customers from toll fraud, CallTower is expanding the list of high-risk calling destinations to include select exchanges in Alaska and Montana.
Customers who do not have high-risk calling enabled on their account may be unable to place calls to certain destinations identified as having an elevated fraud risk.
If you are unable to complete calls to a destination and believe there is a legitimate business need, please contact CallTower Support. Our team can help determine whether fraud-prevention controls are affecting call completion and discuss available options.
Jul 7, 15:45 MDT